bluuebunny/crossref_metadata_2025 huggingface dataset:
An Assessment of Mechanism for Oxidation Corrosion of Alloy T91 Tubes in Supercritical Boilers
Authors: Liu Ding Ping , Ai Zhi Hu , Hu Jian Chen
Published: May 2011

The paper addresses the assessment of the high-temperature oxidation behavior of T91 in supercritical boilers. The trend to higher steam temperatures and longer periods of full-load operation greatly increases the oxidation corrosion on the steam-side surface. The oxide films can lead to major failures and consequently to reduced plant availability. The exfoliation of the oxide scale may block the tubes somewhere in the system with the potential for causing tube explosion. The oxide scale of T91 was sampled and analyzed by the energy dispersive X-ray spectrometry (EDXS) and the X-ray diffractmeter (XRD). The mechanism of oxidation corrosion and scale exfoliation, as well as its influence factor, were described. The measures were brought forward so as to provide a scientific guidance for dealing with oxidation corrosion and oxide exfoliation on a large scale in T91 in the supercritical boiler.
Non-Isothermal Crystallization Behavior of Poly(Ethylene Terephthalate)/Carbon Black Composite
Authors: Jiang Zhao Hui , Jin Jian , Xiao Chang Fa , Li Xin
Published: May 2011

Poly(Ethylene Terephthalate)(PET)/carbon black(CB) composite was prepared by melt blending using a separate feeding technique. The non-isothermal crystallization process of virgin PET and PET/CB composite were investigated by differential scanning calorimetry (DSC) and the different methods such as Jeziorny modified Avrami equation, Ozawa equation and the method developed by Mo were employed to analyze the non-isothermal kinetics of virgin PET and PET/CB composite. The results show that the CB particles dispersed in PET matrix act as heterogeneous nucleating agents, while CB particles hinder the movement of molecular chains of PET, meanwhile, the crystallization activation energy(⊿E) of PET/CB composite is much greater than that of virgin PET according to Kissinger formula, which is opposite to the low CB content condition. This indicates that CB particles reduce the rate of crystal growth. Whereas, the results obtained from the mentioned three methods simultaneously demonstrate the addition of CB greatly increases crystallization temperature and crystallinity and accelerates crystallization rate. Taking the two seemingly contradictory results, crystal growth has little effect on the crystallization rate and crystal nucleation dominate the crystallization process of PET/CB composite with very high CB content. According to Jeziorny method, the constant of crystallization rate (Zc) increases with the increment of cooling rate and Avrami index (n) doesn’t change significantly, but the Zc and n of PET/CB composite are greater than that of PET. Based on Ozawa method, lg[-ln(1-Xt)] and lgR don’t show a good linear relationship. The parameter F(T) increases significantly with the increasing of relative crystallinity and n is almost unchanged. Besides, the F(T) of PET/CB composite is less than that of PET, while a is greater than that of PET. Comparing with Ozawa and Avrami equation, Mo method can better describe the non-isothermal crystallization of PET and PET/CB composite.
Novel Method to Toughen Polypropylene by Uniaxial Compression Processing
Authors: Jiao Ming Li , Yang Kai , Chen Yan
Published: May 2011

Based on the orientation of molecule chain in fibers, it will urge a rapid increase in mechanical properties. Nevertheless, block materials mainly gain rise of mechanical properties by blend or composite today, it is hardly proposed on self-toughening materials by optimizing the microstructure because of a lack of relations between the performance and the microstructure in block materials. In this paper, a toughening PP was gained through small deformation of spherulite, processed by uniaxial compression. A series of measurements were applied, including impact test and polarizing optical microscope (POM). The results show that the impact properties of polypropylene (PP) have a rapid rise. POM suggests that the spherulite has deformed into ellipsoid even belt along the orientation of sample of PP, which plays an important role in toughening.
Fabrication of Mesoporous ZrO2 by Using Rosin-Based Quaternary Ammonium Salt
Authors: Wang Peng , Zhao Zhen Dong , He Li Zhi , Bi Liang Wu , Chen Yu Xiang
Published: May 2011

Mesoporous zirconias were prepared by precipitation method using rosin-based quaternary ammonium salt as a directing agent. The samples were characterized by means of XRD, FT-IR and N2-adsorption and desorption measurements. The phase of precursors was amorphous, and well crystallized tetragonal zirconias were obtained after the calcination at 450 °C. The synthesized mesoporous zirconias possessed high surface areas ranging from 183.56 to 203.87 m2g-1 and big pore diameters varying from 6.27 to 7.58 nm. The content of the rosin-based quaternary ammonium salt had significant influence on the textural properties of the mesoporous zirconias. Surface areas, pore volumes and pore diameters of the mesoporous zirconias decreased when increasing the surfactant dosage.
Research on Preparation and Semi-IPN Structure of Absorptive Copolymethacrylate Fiber
Authors: Feng Yan , Xiao Chang Fa
Published: May 2011

By adding potential crosslinking agent--hydroethyl methacrylate (HEMA), the oil-absorptive fiber with semi-IPN structure CPMAF were prepared using heat crosslinking technology after spinning. The crosslinking structure of the fiber was researched. The results showed that the oil absorbency of fiber with semi-IPN structure was higher than the chemical crosslinked copolymethacrylate particle.
Selective Binding of Nucleobases and its Electrochemical Behavior at Glassy Carbon Electrode in PBS at pH 7.4
Authors: Cui Jing Jie , Sun De Hui , Liu Hong , Wang Guan Cong , Zhao Hong Shi , Ren Na , Chen Li Mei
Published: May 2011

The electrochemical behavior of nucleobases has been studied in 0.1 M phosphate buffer solution (PBS), pH 7.4 without removing oxygen, using glassy carbon electrode (GCE). Cyclic voltammetry (CV), electrochemical impedance experiment (EIS) and square wave voltammetry (SWV) were employed in the measurements of the nucleobases electrochemical signals at GCEs. Guanine (G) and adenine (A) produced well-defined oxidation peaks at about +0.66 and +0.96 V under the CV sweep at 100 mV/s, respectively. SWV was particularly useful in investigating the electrochemical behaviour of pyrimidine bases. In the SWV detection, thymine (T) clearly appeared an oxidation peak at 1.1 V, while cytosine (C) and uracil (U) did a complex oxidation peak at 1.3 V. Nucleobases possess an irreversible and adsorption-controlled electrochemical process at GCEs in 0.1 M PBS (pH 7.4). The average surface concentrations (Γ) of G and A on the surface of the GCE were estimated to be about 1.6515×10−10 and 8.8232×10−11 mol/cm2, respectively. Due to the selective interactions of nucleobases with each other, the nucleobase oxidation peaks shift and new oxidation peaks appeared. The new oxidation peaks at +1.62 and 1.55 V may correspond to the oxidation of GC pairs and AT pairs, respectively. The detection of the electrochemical behaviour and selective binding of nucleobases in a physiological PBS at pH 7.4 is of particular interest for electrochemical sensor applications in physiological media.
Research of Color and Discoloration Resistance of 18K Rosy Gold for Ornaments
Authors: Yuan Jun Ping , Li Wei , Guo Wen Xian
Published: May 2011

75Au25Cu was the basic rosy gold alloy for jewelry, but it had no good brightness and was prone to tarnish and darken. This paper modified this basic alloy through multiple elements and less (micro) alloying, and measured its color and discoloration-resistance. The results showed that small amounts of zinc plus trace of silicon and cerium helped to improve the color and discoloration-resistance of the alloy, the initial colorimetric values fell in between 5N-18 standard alloy and 75Au25Cu basic alloy, while the brightness reached nearly 86, implying that the color was superior to the requirements of EN28654:1993 and ISO8654:1997. Moreover, the test alloy had better preferable resistance to darkening, discoloration and oxidation. All these performances indicated that the test alloy could meet the color requirement of rosy gold for ornaments such as clocks & watches and jewelries.
Synthesis of Nd:YAG Powders by the Co-Precipitation Method
Authors: Zou Xiang Yu , Zhang Hong Bo , Su Chun Hui
Published: May 2011

Yttrium Aluminum Garnet (Nd:YAG) transparent ceramic doped with Nd have predominantly chemical stability, excellent optical quality and high temperature stability, it is becomeing a substitute for single crystal, had already become new generation laser material, have important strategic sense in the laser and the superelevation powders laser system. Al(NO3)3·9H2O, Y2O3, Nd2O3,(NH4)2SO4 and NH4HCO3 are raw material, TEOS is additive and ethylene glycol(EG). Nd:YAG precursor powders witch is Homogeneously dispersed, little agglomerated, pure YAG phase, different Nd3+ doped density were prepared by the co-precipitation method. The Nd:YAG ceramic powders were characterized by TG-DTA, XRD, FT-IR.
Preparation and Photocathodic Protection Properties of NiP/TiO2 Bilayer Coating on Low Carbon Steel
Authors: Zhou Min Jie , Zhang Na
Published: May 2011

The NiP/TiO2 bilayer coatings were prepared on low carbon steel substates using a combined electroless plating and sol-gel method. The performance of photocathodic protection of the bilayer coatings was investigated by the electrochemical method. The results show that the coating with four TiO2 layers and calcined at 400°C exhibits the highest photoelectrochemical efficiency and the best corrosion resistance property.
Chemical Composition and Antimicrobial Activity of Volatile Components from Wild Illicium Wardii in China
Authors: Min Yong , Zhang Wei , Yang Jin , Liu Wei
Published: May 2011

The chemical composition and the antimicrobial activity of the essential oil from Illicium wardii A. C. Smith seed were evaluated.The oil which was analyzed by GC and GC/MS was found to contain limonene (18.8%), dihydrocarveol(16.6%),menthatriene(4.6%),caryophylleneoxide(3.9%),β- pinene (3.6%) as major components . Illicium wardii oil displayed a high inhibitory activity against B.subtilis and S.aureus.
Effect of Trace Yttrium on Properties and Microstructure of Cu-0.6Cr-0.15Zr-0.05Mg-0.02Si Alloy
Authors: Cheng Jian Yi , Yu Fang Xin , Ao Xue Wen
Published: May 2011

Effect of rare earth yttrium on the properties and microstructure of Cu-0.6Cr-0.15Zr-0.05Mg-0.02Si alloy was investigated. The results showed that Cu-0.6Cr-0.15Zr-0.05Mg-0.02Si alloy obtained good comprehensive performance after 80% deformation and then aging at 480°C for 1h, the hardness and electrical conductivity reached 152HV and 85.5%IACS, respectively. The aging time of Y-containing alloy for attaining peak hardness was postponed and the precipitates were finer (2-4nm) and interparticle spacing was shorter than ones of Y-free alloy. The hardness and electrical conductivity of the Y-containing alloy after 80% deformation and then aging at 480°C for 45 min reached 174HV and 82.1%IACS, respectively. The tensile fractures of the two alloys which exhibits the obvious feature of tough fracture.
Investigation on the Permeability of Electric Arc Spraying Sealing Coat with Nano-Sized TiO2,SiO2 of Steel Structures
Authors: Tao Qing , Sui Yan Wei , Sun Zhi , An Yun Qi , Zhao Xin
Published: May 2011

In this dissertation, the electric arc spraying coatings on steel structure were sealed over with the organic coatings addition with nano-sized TiO2, SiO2. Some means as light microscope, SEM, energy spectrum and binding force tests were adopted for research the permeability of the sealer. The mechanism for permeable closeness of the sealer was mainly discussed. The results indicated that homogeneous nanofillers can improvement the runnability and permeability of the epikote, stiffen the adhesion between the coatings and the metal substrate. The coating can seal the metal substrate effectively; enhance the protective property of the tectonic systems with electric arc spraying coatings and organic coatings.
Microstructure and Mechanical Properties of Mg-Y Alloys
Authors: Li Quan An , Zhang Qing , Li Chang Qing , Wang Yao Gui
Published: May 2011

The effects of 2-12 wt.% Y addition on the microstructure and mechanical properties of as-cast Mg-Y binary alloys have been investigated. The results show that proper content of rare earth Y addition can obviously refine the grains and form high melting point Mg24Y5 phases in the matrix, and improve the microstructure and mechanical properties of the alloys. At room temperature, the optimum combination of ultimate tensile strength and elongation, 195MPa and 7.5%, is obtained in Mg-10 wt.% Y alloy.
Synthesis of YVO4 Nanoparticles with Controllable Morphologies by Solvothermal Method
Authors: Xu Hai Yan , Xu Ling , Wu Shi Biao , Wang Xu Dong , Wang Hao
Published: May 2011

YVO4 nanoparticles with various morphologies were tuned directly by hydrothermal treatment in different solutions, including pure water, potassium hydroxide solution, hydrazine hydrate, ethanolamine, triethylamine, and pyridine. X-ray diffraction (XRD), Raman, and transmission electron microscopy (TEM) were utilized to characterize the structure, morphology, and size of the products, which indicated that tetragonal phase YVO4 crystallites displaying rod-like, square, and olivary shapes were obtained. It was found that the selected solvents play an important role in modulating the morphology and confining the size of the obtained products.
Study on the Adhesion Properties of Protective Films to the Magnetic Refrigerant Material
Authors: Zheng Xiao Qiu , Ai Yong Ping
Published: May 2011

Gd substrates were differently coated with Ti and 1Cr18Ni9Ti by means of DC magnetron sputtering technology. The characteristics of the films have been investigated by scanning electron microscopy(SEM), EDS,X-ray photoelectron spectroscopy(XPS),and the adhesion of films were tested by tension test. The results show that the surfaces of films are smooth and perfect, the interferences between Gd and films join together strongly, and the adhesion strengths are larger than 15MPa in these tests.
Diallyl Orthophthalate(DAOP) Resin as a Reactive Plasticizer for Optimizing Glass-fiber/PVC Interface and Reactive Kinetics
Authors: Wen Peng , Mei Qi Lin , Yue Xiao Qin , Liu Meng Xin
Published: May 2011

To improve brittleness and optimize interface of glass-fiber/PVC composites, reinforcing and toughening technologies for glass-fiber/PVC composites were studied. Influences of glass-fiber and diallyl orthophthalate(DAOP) resin on their mechanical properties were observed. Diallyl orthophthalate(DAOP) resin was blended with PVC in various weight ratios by melt compounding. The compatibility between diallyl orthophthalate(DAOP) resin and PVC resin was analysed by measuring the impact toughness, tensile strength and bending strength. The results clarified that each mechanical properties improved, in addition to,SEM images show that the interface of glass-fiber/PVC composites added with DAOP was much closer , PVC resin surrounds completely the glass-fiber.
Changes of Dynamic Viscoelastic Properties of Tamarind Gum Aqueous Solutions
Authors: Sittikijyothin Wancheng
Published: May 2011

Tamarind gum was obtained from the seeds of Tamarindus indica. It was rich in polysaccharide (79.96%) and protein (13.46%) contents. In this work, the dynamic viscoelastic properties of tamarind gum aqueous solutions were investigated with a Haake Rheometer RS75 as a function of gum concentration and temperature. Four types of sample solution systems: a dilute solution, a concentrated solution, a weak gelled system, and a gelled like system were observed. The effect of concentration showed that the typical shape of the mechanical spectra for the dilute solution occurred for 2.30 wt% and the gelled like behaviour arose for the higher concentration (≥7.05 wt%) as measured at 25°C. While the effect of temperature on the dynamic viscoelastic properties of tamarind gum solution (6.91wt%) showed that the gum solution behaved the weak gelled system (25°C) and subsequently gelled like system (≥30°C).
Piezoelectric Properties of PZT-5 Fiber/Epoxy Resin 1-3 Composites
Authors: Xu Ling Fang , Chen Wen , Zhou Jing , Yang Chang Ping
Published: May 2011

Niobium doped Pb(Zr,Ti)O3 fiber/epoxy resin 1-3 composites with different ceramic volume fraction of 10-85% were fabricated by filling-casting method. Effects of ceramic volume fraction on electric properties were investigated. For a typical 30% ceramic content composite, the thickness coupling coefficient kt, mechanical quality factor Qm, acoustic impedance Zm and anisotropic property kt/kp were 0.67, 0.55, 11.03 MRayl and 2.23, respectively.
Preparation and Characterization of Two New Kinds of Soluble Quaternary Ammonium Salts of Chitosan
Authors: Tan Li Ju , Wang He Dong , Wang Jiang Tao
Published: May 2011

Schiff base of chitosan was obtained by the reaction of chitosan and aromatic aldehyde, and then Schiff base of chitosan reacted with methyl iodide to get soluble quaternary ammonium salts of chitosan which were N-metoxybenzenemethyl quaternary ammonium salt of chitosan (NM- Chitosan) and N-hydroxybenzenemethyl quaternary ammonium salt of chitosan(NH-Chitosan). The obtained chitosan derivatives were characterized by Infrared Spectra Analysis(FT-IR), Nuclear Magnetic Resonance Spectroscopy(1H NMR) and elemental analysis. Quantitative analysis showed that there was small difference between degrees of quaternization(DQ) and degrees of substitution(DS), and the solubility of chitosan derivatives was demonstrated to be better in the organic solvents.
Highly Sensitive Detection of Trace Hg2+ Based on Fine CdS Nanodots Grew from a DNA-Directed Alternate Dialysis Method
Authors: Chen Shu , He Quan , Tang Jian , Bai Shan , Long Yun Fei
Published: May 2011

Fine CdS nanodots (~5 nm) have been prepared in aqueous solution under the control of ds-DNA via a novel alternating dialysis procedure, which have been characterized by TEM, UV-vis, fluorescence (FL) and resonance light scattering (RLS) spectra. The resultant well-dispersed CdS nanodots present a strong FL peak at 339 nm and RLS bands around 394 nm. Interestingly, it was found that the quenching of FL and the enhancing of RLS intensity are dependent on the concentration of Hg2+, both of which showed good linear relationship over the range of 0.01-100 mmol/L, with a detection limit (3s) as low as 0.91 nmol/L. Good selectivity of this method for Hg2+ analysis has also been checked over other metal ions.
Effect of Modified Graphene Addition on the Electrical Properties of Epoxy Resin Composite
Authors: Wu Li Li , Lv Xiang , Zhang Chao Can
Published: May 2011

Graphene normally has weak interface compatibility to organics. In this paper, the surface of graphene is modified in order to improve its compatibility with polymer matrixes. Therefore, a Silane Coupling Agent(SCA) γ-Glycidoxypropyltrimethoxysilane is used to modify graphene. The results of the TEM, FTIR and sedimentation test show that SCA grafting can improve the graphene’s dispersion stability in polar organic solvent. Then modified graphene is added to epoxy resin to obtain an epoxy resin composite. The conductivity of the epoxy resin compostie can reach 8.00E-009 s/m. When additional percentage of SCA is over 0.5%, the dielectric constant (ε) has a remarkable increase.
Microstructure of Copper Alloy Effects on Cavitation Damage
Authors: Xing Wen Jing
Published: May 2011

The cavitation erosion behavior of ZQAl9-4-4-2 nickel-alum inium bronze in 2.4%NaCl solution was investigated by using a magnetostrictive – induced cavitation facility. The micrographs of damaged surface were observed by scanning electron microscope (SEM) and transmission electron microscopy(TEM). The results showed that the cavitation microcrack in the a phase adjacent to the k phase. They propagated and connected with each other in the a phases, resulted in the removal of a phases and detachment of the kphase from the matrix in the following test period followed. The microcracks tended to propagate parallelly to the eroded surfaces.
The Influence of Aluminum on the Electrochemical Performance of Zinc Alloy Anode
Authors: Wang Li Zhen , Han Yan Juan , Zhang Kai Qing , Wang Kun
Published: May 2011

The electrochemical behaviors of zinc electrode containing Bi, In and Al were tested to study aluminum acting on the electrochemical performance of zinc anode using anodic polarization and tafel profiles measurement. The element distributions of IBA alloy were observed by scanning electron microscope (SEM). Our recent investigations demonstrate that the electrochemical activity of zinc alloy could be improved largely through integrating the optimization content of aluminum into zinc alloy. The SEM images show that there are obvious differences in the element distributions of surface, subsurface or bulk phase, especially, the segregation of Al in subsurface or bulk. The electrochemical behaviors of IBA alloy are related to its physical properties.
Preparation and Performance Test of Antistatic Agent for Polyurethane Seal Material in Mine
Authors: Bi Wen Yan , Guan Xue Mao , Wan Jian Feng , Yang Xiao En
Published: May 2011

As a good insulator, the surface resistance of polyurethane is large and the conductivity is poor, which made it easy to produce static electricity and cause explosion, fire and other incidents. A coating antistatic agent was prepared through designing and modifying which can significantly improve the antistatic properties of polyurethane seal materials for coal mine, without affecting the operational performance. Especially, it not only can meet the requirements of antistatic performance for coal mines, but also environmental friendly.
Properties of White Light Emitting Eu2+ , Mn2+ Co-Doped Ca2SiO3Cl2 Phosphors Synthesized with Sol-Gel Method
Authors: Ning Qing Ju , Wang Bang Qing , Gu Su Hang , Guo Fang Fang
Published: May 2011

The luminescent properties of Eu2+, Mn2+co-doped Ca2SiO3Cl2 phosphors synthesized by the sol-gel method were investigated. The crystal structure, pattern and luminescence properties were characterized by the X-ray diffraction (XRD), scanning electron microscope (SEM), and photoluminescence (PL) testing. The result showed that pure Ca2SiO3Cl2 was prepared at 570°C for 8h in the active carbon weak reducing atmosphere. The phosphor particles showed Eu2+ by the excitation spectrum located at 365nm found that spectra with an emission peak located at a 446nm and the other emission spectrum was dominated by the green peak located at 497nm. Due to the Eu2+ center transfer energy to the Mn2+ center that there be an emission spectrum peak located at 580nm. Three of emission spectrum peaks stacking to white light.
Nano-Crystalline Structure and Strengthening Mechanism of Nano-Diamond/Ni Composite Coatings by Brush-Plating
Authors: Li Ying , Zou Wen Jun , Li Bian Xiao , Dong Qi Ming
Published: May 2011

Nano-diamond/Ni and Ni coatings were prepared by brush plating. SEM and XRD methods were applied to investigate the morphology, nano-crystalline structure and grain size of the coatings. The results show that the grain size of the brush coatings all is in nanometer scale. The surface morphology of the composite brush coatings is a finer and denser cauliflower-like structure. Meanwhile the reasons of formation nano-crystalline structure are the high over-potential, the discontinuous grain growth resulted from the reciprocating motion and friction between the plating pen and the work piece, the heterogeneous nucleation of the nano-diamond, and the point discharge effect. The nano-diamond as the second phases decreases the grain size of the coating and consequently increase the strength of the composite coatings largely.
Preparation and Characterization of β-Cyclodextrin-Based Microcapsules for Sustaining Release of Jasmine Oil
Authors: Lian Yuan , Wang Hong Mei , Zhou Da Peng , Liu Dan
Published: May 2011

A fragrance, jasmine was encapsulated into β-cyclodextrin to prepare microcapsules that can sustain the release of the fragrance and potentially be bound to textile material. This study examined the structures, thermal properties, partied size distributions, and release behaviors of the microcapsules. The release of jasmine was examined in air at elevated temperature. The experiments showed that β-cyclodextrin could efficiently sustain the delivery of jasmine.
Preparing of NiAl and Ni3Al Intermetallic Composite Coatings by Laser Cladding In Situ Synthesis
Authors: Cheng Guang Ping , He Yi Zhu
Published: May 2011

Ni-Al intermetallic compound coatings no visible cracks, pores or inclusions are prepared on mild steel substrate by Laser- cladding in situ synthesis with mixed powders of nickel-coated aluminum, Ni-based alloy and Al. The results show that the microstructure of the coating consists mainly of two phases of NiAl and Ni3Al, and the former amount is more than the latter, with NiAl being uniformity and staggered fine dendrites which are surrounded continuously by Ni3Al, and the atom ratios of Ni∶Al∶Fe∶Si in NiAl and Ni3Al are respectively 54∶39∶2∶5 and 70∶21∶3∶6. Compared with cladding nickel-coated aluminum, the coatings quality are improved, and the dilution of iron from substrate into coating are greatly reduced, as a result of lower cladding powers due to self-fluxing of Ni-based alloy and exothermic reaction between Ni and Al. The hardness of coatings are up to HV490-HV540.
Anti-Wear Coating Grown by Micro-Plasma Oxidation on Aluminum Alloys in the Solution of Aluminate-Titania
Authors: Zhang Li Gong , Zhao Gui Mei , Lai Xiao Ming
Published: May 2011

In this paper, Aluminum trioxide ceramic coatings were grown on surfaces of 2024 Aluminum alloys by micro-plasma oxidation in an aluminate electrolytic solution. In order to decrease the density of the pores and increase the anti-wear property of the ceramic coatings, Titania were added into the aluminate electrolytic solution. The struture and anti-wear property of the produced ceramic coatings were measured by X-ray diffraction, scanning electron microscope , hardness tester and frictionometer. The results show that the thickness of the ceramic coating is about 24±1 μm, surfaces of the ceramic coatings are very uniform. The hardness of the doped coating is up to 930 HV, and the wear property of the coating is the more excellent than that of undoped coating.
Experimental Study of the Soundness and Compatibility of Baosteel Steel-Slag Powder Applied in Cement Concrete
Authors: Sun Jia Ying , Chen Fu Dan
Published: May 2011

To reduce the cost and improve concrete performance, massive admixtures were needed to be added to the concrete. With the research going, the high quality mixture is increasingly becoming the indispensable concrete component. The steel slag powder is the steel-slag comprehensive utilization technical commanding point compared with the level of the steel slag application nowadays in the world. In order to develop the application of the steel slag fine powder in cement concrete domain, this article analyzes autoclaved soundness of the Baosteel steel-slag fine powder as well as the compatibility of it with the cement and the concrete admixtures.
Role of Crystallitic Carbon in the Preparation of Mg-Based Hydrogen Storage Materials by Reactive Milling
Authors: Zhou Shi Xue , Niu Hai Li , Chen Hai Peng , Lu Shuai Shuai , Zhang Cai E , Feng Li Ye , Zhang Qian Qian
Published: May 2011

Magnesium-based hydrogen storage powders were prepared by reactive milling under hydrogen atmosphere. The crystallitic carbon, prepared from anthracite coal by demineralization and carbonization, was used as milling aid and synergic hydrogen storage additive of magnesium. Dispersive powders of particle size about 20 to 60 nm and hydrogen capacity of 4.78 wt.% were prepared from magnesium with 40 wt.% of crystallitic carbon by 3 h of milling under 1 MPa of hydrogen atmosphere. The hydrogen stored in carbon increased with the addition of Al, Mo, Co and Fe. FT-IR showed that the carbon atoms at the edges of crystallitic carbon particles were hydrogenated into C-H during reactive milling with hydrogen. The initial dehydrogenation temperature of hydrogen-storage material 60Mg40C is 275.8 °C, and its dehydrogenation plateau pressure at 300 °C is 0.2 MPa and the length of the plateau is 5.0 wt.% of hydrogen capacity.
Research Progress on Preparation of Hierarchical Porous Oxides Derived from Wood Templates
Authors: Qin Hui , Zhu Zong Qiang , Zhu Yi Nian , Wei Cai Chun , Liu Hui Li
Published: May 2011

This paper reviews the prospect and research history of the hierarchical porous oxides. Give some preparation methods and application of hierarchical porous oxides derived from wood templates. The selection of plant template, varieties of impregnating agents, different preparation processes and characterizations of compounds are discussed and analyzed.
The Growth Process of the PEO Films under Escalating Voltage Waveform
Authors: Wang Li , Fu Wen , Chen Li
Published: May 2011

In order to get a clear picture for describing the growth process of plasma electrolytic oxidation coatings under escalating voltage waveform, the characteristics of PEO coatings formed at different reaction stages were systemically investigated. The morphology and corrosion resistance of the films were studied by scanning electron microscope and potentiodynamic polarization curves. The uniform, semi-transparent and better corrosion resistance of the oxide films on the magnesium electrode surface were formed owe to the extended anodizing time at the initial stage under escalating voltage mode. After sparking occurred, generated ceramic coatings were brokedown, melted, cooled and solidified continuously, so the ceramic coatings were uniform and dense. It also exhibited superior corrosion resistance.
Processing and Properties of GPTMS-TEOS Hybrid Coatings on 5083 Aluminium Alloy
Authors: Rahimi Hamed , Mozafarinia Reza , Shoja Razavi Reza , Paimozd Ebrahim , Hojjati-Najafabadi Akbar
Published: May 2011

The hybrid nanocomposite coatings were processed in solution using acid-catalyzed hydrolysis and condensation of precursors 3-Glycidoxypropyl trimethoxysilane (GPTMS) and Tetraethoxysilane (TEOS) forming self assembled nanoscale composite. Coating were applied by dipping 5083 aluminium alloy in sol-gel solutions at several stages and different aging times. Effect of GPTMS-TEOS sol's aging time on thickness, adhesion, and corrosion behaviour of hybrid organic-inorganic GPTMS-TEOS sol-gel coatings have been investigated. The results indicated that thickness of hybrid coatings increased but adhesion decreased with increasing aging time. Adhesion test and electrochemical polarization behaviour reveal that if the coating process was chosen correctly, the coating had a good adhesion strength and corrosion resistance.
Study on Organic Microcapsule Based Self-Healing Cementitious Composite
Authors: Zhang Ming , Xing Feng , Shi Kai Yong , Du Xue Xiao
Published: May 2011

Base on engineering application need, the subject introduce microcapsule that contains adhesive into cementituous composite for realizing the self-healing characteristics of cracked concrete. The technique has good industry feasibility, process operability, and reproducibility of self-healing characteristic. It is can resolve partial problems that other current self-healing methods are facing.
Zinc Oxide Thin Films Grown on Nanostructured Al Thin Layer/Glass Substrate by RF Magnetron Sputtering
Authors: Liu Ting Zhi , Duo Shu Wang , Hu C Y , Li C B
Published: May 2011

ZnO films were deposited on nanostructured Al (n-Al) /glass substrate by RF magnetron sputtering. The results shows that the relation (I (002) /I (100) ≈ I annealed (002)/I annealed (100) ≈1.1) shows the rough n-Al surface is suitable for the growth of a-axis orientation. Meanwhile, the influences of substrate roughness, crystallinity and (101) plane of ZnO film deposited on n-Al layer have been discussed. XPS implies more oxygen atoms are bound to Aluminum atoms, which result in the increase of high metallic Zn in the film.
Effect of Stepped Solution Treatment on Microstructure and Properties of AA7085 Aluminum Alloy
Authors: Li Chun Mei , Chen Zhi Qian , Zeng Su Min , Cheng Nan Pu , Geng Zhen Hua , Li Quan
Published: May 2011

The effect of stepped solution treatment on the mechanical properties and the microstructure of AA7085 have been investigated compared to AA7050. Optical and electron microscopy observation and electron probe microanalysis were used to analyze the microstructure and tensile fracture surface of AA7085 and AA7050 processed via various treatment schedules. Besides, X-ray diffractometer and differential scanning calorimeter were used to seek the differences of microstructure characters between AA7085 and AA7050. The results indicate that higher content of Zn along with lower content of Mg and Cu and strictly confined Fe and Si made the matrix of AA7085 get a larger single phase and a higher melting temperature of multi-phase eutectics. By using a lower temperature pretreatment, the initial melting temperature of the alloys can be increased. Consequently complete dissolution of remnant constituents was achieved without overheating. Based on thermodynamics statistic theory, the supersaturation degree of the matrix and the density of cavity may be increased with the elevation of the lattermost solution temperature, which resultes in the increase of fracture toughness and optimization of the microstructure after aging.
Study on the Weldability of S32205 Steel under Different Welding Processes
Authors: Yang Li , Zhang Na
Published: May 2011

The effect of different welding methods on joints’ microstructure and properties of A240-S32205 duplex stainless steel was studied. The result showed all joints using GTAW and SMAW can attain good phase ratio and corrosion resistance. But the comprehensive mechanical characteristics of joint using GTAW was better than that of SMAW joint with acid electrode. Besides, the low temperature impact performance was not ideal in joints manual welded with acid electrode. The HAZ was identified as a weak zone where the corrosion resistance was the worst and in which the third detrimental metallic phase was more liable to emerge than in weld zone.
Study on the Capacitance Performance of Activated Carbon Material for Supercapacitor
Authors: Zhang Sheng Li , Song Yan Hua , Li Xiao Gang , Li Wei
Published: May 2011

Activated carbon for electric double-layer capacitors was prepared from bamboos by activation with KOH solution through heating by microwave radiation. The influence of the mass ratio of KOH to bamboo, power and radiation time of microwave was studied. The behavior of charge/discharge, cyclic voltammetry and AC impedence of bamboo-based activated carbon electric double-layer capacitor was investigated. The results indicated that the specific capacitance of bamboo-based activated carbon supercapacitors can reach 277.46F/g while KOH to bamboo is 6:1 and the power and radiation time of microwave are 720W and 12 minutes respectively. Moreover, the electric double-layer capacitor using the activated carbon as electrode materials has good charge/discharge properties and cycling performance.
The Research of Soy-Protein – Acrylate Hybrid Emulsion
Authors: Pang Jiu Yin , Sun Chuan , Zhang Shi Cheng
Published: May 2011

This study researched the preparation of soy-protein and acrylic hybrid emulsion based on the emulsion formula preparation. The particle structure and shape was analyzed by DSC, ascertained by measuring adhesion properties of different emulsion on the same substrate by strength capability. The result show that the bonding strength of hybrid emulsion was better than the blending emulsion, and the glass temperature of hybrid emulsion was same with the blending emulsion.
Adsorption Properties for Superabsorbent of Inverse Suspension Polymerization Poly(acrylate-Co-Acrylamide)
Authors: Xie Jian Jun , Li Na , Huang Kai , Han Xin Qiang
Published: May 2011

Superabsorbent polymers are lightly crosslinked, hydrophilic polymer network having many functional groups. The adsorption properties in heavy metal ion solutions using poly(acrylate-co-acrylamide)(PAAM) are investigated. It is found that PAAM has a high uptake to heavy metal ions, and that the adsorption of heavy metal ions is greatly influenced by pH and the initial solution concentrations. The biggest and the smallest amount of adsorption are Cu2+ and Cr3+ in CuCl2 and CrCl3 solution, respectively. It was feasible for selective adsorption of the metal ions in the solution onto PAAM hydrogel by controlling the pH values of the mixing solution for CuCl2, FeCl3, CrCl3. Langmiur equatiom can satisfactorily fit for the adsorption of Cu2+ while not fit for that of Fe3+ and Cr3+.
Fabrication and Properties of Shape Memory Polyurethane Surface Modified Vapor Grown Carbon Nanofiber Composites
Authors: Cen Hao , Li Shan , Du Ming Liang , Fu Ya Qin
Published: May 2011

Shape memory polyurethane (SMPU)/Vapor grown carbon nanofibers (VGCNF) composites with different surface functionalized method were prepared via sol-gel process. The structure and properties of the composites were investigated by scanning electron microscopy (SEM), universal testing machine, and dynamic mechanical analysis (DMA). The results show that the dispersion of VGCNF with surface modification in matrix is better than that of pristine. The mechanical properties of the composites with VGCNF modified by concentrated nitric acid deteriorated substantially. However, both the tensile strength and elongation at break of the composites combined surface modification of silane coupling agent and sol-gel method increased obviously. The substantially improved mechanical properties are mainly attributed to the cross-link between coupling agent and the network structure of SiO2 produced during the sol-gel process. The DMA analysis suggests that the surface treatment of the VGCNF exhibit obviously effect on the dynamic mechanical properties of the composites.
The Probabilistic Compliance Methodology for Damage Tolerance Design of Thicker Composite Structure
Authors: Zou Tian Chun , Hao Peng , Zhang Jia Rui , Feng Zhen Yu
Published: May 2011

In this paper, the probabilistic compliance methodology for damage tolerance design of thicker composite structures were investigated, and the research results show that for the composite laminates withstanding impact energy below 90J, if it cannot produce barely visible impact damage (BVID), then using the probabilistic methodology can meet certification requirements of damage tolerance.
Effect of the Substrate Temperature on Crystalline and Optical Properties of ZnO Thin Films Prepared by CVD
Authors: Xu Ying , Ma Peng Hua , Dou Yu Bo , Cai Yan Qing
Published: May 2011

Using chemical vapor deposition (CVD) method and purified air as carrier and diluent gas, ZnO thin films was prepared with zinc acetate on glass substrate. Crystalline and optical properties of ZnO thin films were respectively tested by X-ray diffractometer (XRD) and UV-light spectrophotometer. The results showed that crystal face (002) of thin films was preferred orientation. In the visible region, the transmittance was over 85%. When ZnO thin films was prepared at 500 °C, the crystallization of ZnO thin films was the best, and when the temperature was 450°C, the grain size of thin films was the least, and internal stress was the least. With the substrate temperature increased, ZnO thin films both showed blue shift of the absorption edge and decrease of band gap.
The Ferroelectric and Electrical Properties of CaBi4Ti4O15 Thin Films Prepared by Sol-Gel Technology
Authors: Chien Tsung Fu , Tsai Jen Hwan , Chen Kai Huang , Cheng Chien Min , Wu Chia Lin
Published: May 2011

In this study, thin films of CaBi4Ti4O15 with preferential crystal orientation were prepared by the chemical solution deposition (CSD) technique on a SiO2/Si substrate. The films consisted of a crystalline phase of bismuth-layer-structured dielectric. The as-deposited CaBi4Ti4O15 thin films were crystallized in a conventional furnace annealing (RTA) under the temperature of 700 to 800°C for 1min. Structural and morphological characterization of the CBT thin films were investigated by X-ray diffraction (XRD) and field-emission scanning electron microscope (FE-SEM). The impedance analyzer HP4294A and HP4156C semiconductor parameters analyzer were used to measurement capacitance voltage (C-V) characteristics and leakage current density of electric field (J-E) characteristics by metal-ferroelectric-insulator- semiconductor (MFIS) structure. By the experimental result the CBT thin film in electrical field 20V, annealing temperature in 750°C the CBT thin film leaks the electric current is 1.88x10-7 A/cm2 and the memory window is 1.2V. In addition, we found the strongest (119) peak of as-deposited thin films as the annealed temperature of 750°C
The Ferroelectric Characteristics of Ba(Zr0.1Ti0.9)O3 Thin Films under Post-Annealing Treatment for Applications in Nonvolatile Memory Devices
Authors: Chen Kai Huang , Tsai Jen Hwan , Wu Chia Lin , Lin Jian Yang , Cheng Chien Min
Published: May 2011

In this study, we investigated that of Al/ Ba(Zr0.1Ti0.9)O3 (BZT)/Pt/Ti/SiO2/Silicon metal-ferroelectric-metal-insulator-semiconductor (MFM) ferroelectric structures and found the memory effect and capacitance of annealed BZT films during the different annealing temperature. Additionally, the capacitance and leakage current density were about 4.3 nF and 1´10-6A/cm2, respectively. From C-V curves, the ferroelectric properties and charges accumulation of annealed BZT films were also found during the annealing temperature of 700°C.
Structure and Thermal Stability of Natural Rubber Reinforced with In Situ Generated Zinc Sorbate
Authors: Zeng Zong Qiang , Peng Zheng , Kong Ling Xue , Liu Hong Chao
Published: May 2011

In situ prepared zinc disorbate (ZDS) in natural rubber (NR) by the reaction of zinc oxide and sorbic acid was used to reinforce the dicumyl peroxide-cured NR vulcanizate. The changes in mechanical properties of NR vulcanizates after ageing and were determined and the structures and thermal stability of vulcanizates were also analyzed using scanning electron microscope and thermal gravimetric analyzer. The change ratios in tensile strength and elongation at break of NR vulcanizate with theoretic formation of ZDS of 21phr can be increased to -33 from -44 and -27 from -38 after ageing and the initial weight loss temperature of NR vulcanizate can be increased for about 7°C as compared to un-reinforced NR vulcanizate, indicating that the antioxidative behavior and thermal stability of NR can be improved significantly with theoretic formation of ZDS of 21phr.
Effect of Electromagnetic Stirring Method on the Microstructure of an Al-Cu Alloy in Semi-Solid
Authors: Chen Li Juan , Jing Qing Lin , Jiang Ye Hua
Published: May 2011

In order to change the dendritic grain structure of Al-Cu alloy to equaxed grain, the effects of electromagnetic stirring on the microstructure of an Al-Cu alloy were investigated. The results show that the positive and negative stirring has the best stirring effects at the same condition. It is apparent that the morphology of α-Al is closely related with the comprehensive interactions between stirring strength and stirring time.
Improved Detection of Hg2+ in Aqueous Solution with High Sensitivity and Selectivity by Using Mercury-Specific DNA, Sybr Green I and Gold Nanoparticles
Authors: Xu Hui , Gao Shuli , Chen Jian Nong , Liu Quan Wen
Published: May 2011

We report a label-free, fast, fluorescence turn on assay for Hg2+ detecton by using mercury-specific DNA (MSD), Sybr Green I (SG) and gold nanoparticles (AuNPs). SG efficiently discriminates MSD and MSD/Hg2+ complex. The addition of gold nanoparticle decreases the background fluorescence signal further for MSD. The fluorescence intensity of MSD/Hg2+ complex keeps constant after addition of AuNPs. This property improves the signal-to-background ratio and decreases the detection limitation further. In addition, the method shows improved selectivity compared with that in the absence of AuNPs. This strategy could be applied to the detection of potassium ions and showed good generality.
Phenyl-3-(1-Aniline)-1-Propene Schiff Base on N80 Steel in 15% HCl Solution
Authors: Fang Xiao Jun , Zhang Juantao , Chen Chang Feng , Bai Zhen Quan , Peng Wei Hua
Published: May 2011

In this study, 1-phenyl-3-(1-aniline)-1-propene (PAP) was synthesized by aniline and Cinnamaldehyde, and its inhibitive effect on N80 steel in 15% HCl solution was investigated by using weight loss and electrochemical techniques (such as electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization). The chemical structure of PAP was confirmed by Fourier transform infrared spectroscopy (FTIR). The results were shown that, the inhibition efficiency of PAP could exceed 99%. Polarization measurements indicated that, the inhibitor acted as mixed type.
Dynamic Characteristics Analysis in Different Kinds of Mega-Frame Structures Subjected to Vertical Seismic Force
Authors: Nie Zhi Hua , Liu Hong Bing
Published: May 2011

In this paper, two kinds of mega-frame structures have been simplified to the series-parallel-connection model which considered with joint rotation. The stiffness matrix and mass matrix also have been established and predigested. The vertical stiffness matrix and mass matrix have been obtained. There has been a dynamic characteristics analysis on the structures subjected to vertical seismic force with the method of analysis of step-by step integer. From the results some dynamic characters of structures subjected to vertical seismic force have been obtained.
Vibration Reduction Analysis of Reticulated Shell
Authors: Yang Zhong , Cao Jing
Published: May 2011

Reticulated shell is one type of the common spatial structure form. This paper proposes a vibration reduction method by supplementing viscous dampers in the reticulated shell. It analyzes the seismic performance on the optimum partial double-layer reticulated shell with dampers by ANSYS soft, gains the stress in the members and the nodal displacements, and compares the dynamic responses between the normal and vibration reduction structure. By means of different parameters, the rules of vibration reduction effect in the reticulated shell with viscous dampers are acquired. It is shown through the calculation that the method developed in this paper is efficient for the dynamic analysis of the reticulated shells.
Experimental Study on Specimens of Steel Secondary Beam Embedded in Reinforced Concrete Girder of Frame Structure
Authors: Yu Qiong , Lu Zhou Dao , Yu Jiang Tao , Zhao Xing Zhuang , Dai Jin
Published: May 2011

Test of two specimens (four different joints) of steel secondary beam embedded in reinforced concrete girder in frame structure and one specimen with steel cantilever beam embedded in reinforced concrete girder under static load were conducted. The steel beam up-flange was pulled out because of the concrete cracks caused by the moment, shear and torsion at the upper zone of the concrete beam near the steel beam end. Shear failure of the concrete beam and the top flange pullout failure are the most hazardous failure modes. Lacking restraint of concrete and the reinforcement of steel bar in the concrete slab and catenary action of restraint steel beam, the capacity of steel cantilever beam is much smaller than other beams. Load-slip curve of top flange of steel beam, load-rotation curve of the steel beam end are obtained through experiment. Primary calculation method of joints flexural capacity related to section size of composite steel beam, embedded depth of steel beam, flange width of steel beam embedded end, height of frame girder, is put up with. Analytical results of ABAQUS are shown as follows. Top flange pullout failure of steel beam is caused by the detachment of concrete and steel beam end, and the warp of the concrete slab near the support plays an unfavorable action on the performance of the steel beam. The end rotational angle of the steel beam with anchor bar is smaller than that without. The steel beam with shear connectors develops a smaller rotational angle and a higher load capacity.