bluuebunny/crossref_metadata_2025 huggingface dataset:
Rheological Properties and Microstructures of Thermo-Sensitive Microemulsion-Based Gels
Authors: Zhao Xue Yan , Cao Yu Rong , Xiao Rui Jie , Cao Gui Rong
Published: July 2012

Thermo-sensitive microemulsion-based gels (MBGs) were prepared by the addition of Pluronic P123 (PEO20PPO70PEO20) into O/W microemulsion composed of isopropyl myristate (IPM)/Span20/Tween20/H2O. The results of rheological measurements indicate that the viscoelastic properties of the systems increase and the gelation temperatures decrease with increasing P123 concentration. Fluorescence spectroscopy was used to study the micropolarity of the hydrogel (P123/H2O), microemulsion and MBGs systems. The results show that the microstructures of microemulsion droplets are maintained in MBGs.
The Primary Study on PP/Sawdust/PU Sound-Absorbing Plank
Authors: Huang Chen Hung , Li Ting Ting , Chuang Yu Chun , Lou Ching Wen , Lin Ching Wen , Lin Jia Horng
Published: July 2012

By recycling method, the wastes in the nonwoven industry decreases, and simultaneously multiple functions are attached to the nonwoven, leading to varied application of nonwoven. With these purpose, different ratios of recycled sawdust was blended in PU foaming body material, and the optimal ratio was chosen based on the best sound-absorbing property. Additionally, recycled polypropylene (PP) fiber and PP fiber were needle-punched to form PP nonwoven foundation. Ratios of the PP recycled selvages were varying in this process. Afterwards, tensile strength and sound absorption coefficient of nonwoven foundations were both evaluated for optimal nonwoven parameters. Finally, the optimal Sawdust/ PU foaming and PP nonwoven foundation were laminated into a sandwich-structure composite—PP/Sawdust/PU sound-absorbing plank, following characterizations of sound-absorbing property and mechanical property.
Synthesis and Mesomorphism of a Novel Triphenylene-Based Discotic Liquid Crystal with Chiral Chain
Authors: Zhang Ming Xia , Wang Yi Fei , Zhang Chun Xiu , Wu Hao , Pu Jia Ling
Published: July 2012

A novel triphenylene-based discotic liquid crystal compound was synthesized in this study. The chemical structures of compounds were characterized by 1HNMR spectra, FT-IR spectra and were confirmed. The phase transition behavior was studied in the combination of texture observation by DSC and POM equipped with a temperature-controllable hot-stage. The object compound showed liquid crystal phase and the results showed that columnar liquid crystal phase between 90.1°C and 138.1 °C during heating.
Synthesis of Carbazole Modified Glass Plate for Detecting Nitroaromatic Compounds
Authors: Dong Xue Ming , Cui Yue Zhi , Li Tian Duo
Published: July 2012

A novel of carbazole derivatives containing –Si-OCH3 groups was successfully synthesized by reaction of carbazole with γ-chloropropylmethyldimethoxysilane. By immobilizing the carbazole derivatives on a glass plate surface through the chemical reaction of -Si-OCH3 and -Si-OH, a novel photoinduced luminescence film sensors was prepared. The structures of carbazole derivatives was determined by means of 1H NMR and the film was characterized by fluorescence measurements, contact angle, X-ray photoelectron spectroscopy. The sensing performance of the functionalized glass sensor has been evaluated.
Preparation of Triethylenetetramine-Functionalized Adsorbents for Selective Adsorption of Copper and Zinc Ions
Authors: Liu Chang Kun , Zhao Xu Xin , Fang Lin , Yue Xiao Fang
Published: July 2012

Selective adsorption of a target adsorbate is critical in adsorbent performance evaluation, and is of great importance in industrial applications. In this study, the selective adsorption of copper and zinc ions was investigated with the polyamine-functionalized polymeric adsorbents. The adsorbent was prepared by amination of crosslinked poly (glycidyl methacrylate) (PGMA) with triethylenetetramine (TETA). The influencing factors including reaction time and TETA content during adsorbent synthesis were investigated. The prepared adsorbents (P-TETA) was used to study the adsorption selectivity toward copper and zinc ions in single species system (when only one metal ion is present) and binary species system (when both metal ions are present). Both the pH effect and the adsorption isotherm were examined in single and binary species system. It was found that both Cu and Zn ions would be adsorbed onto P-TETA in significant amount in single species system at higher pH values. However, in binary species system with high initial concentrations for both Cu and Zn ions, Cu ions would be selectively adsorbed onto P-TETA, with insignificant amount of Zn ion adsorbed. The higher coordination constant (in Log K form) of Cu-TETA coordination than Zn-TETA coordination was identified as the major mechanism for the selective adsorption of Cu over Zn ions with P-TETA adsorbents.
Synthesis of Bis-(Tributyl citrate acid)esters as Novel Green Plasticizers
Authors: Meng Ge , Yang Tao , Shi Jian Hua , Zheng A Qun , Liu Yang , Wang Qing
Published: July 2012

Citrate esters were used as plasticizers in many kinds of plastic resins. Several compounds with new structure of bis-(tribytyl citrate acid) esters have been synthesized via an environmentally friendly way with relatively high yields. The structure of each compound has been verified by MS and NMR spectra analysis. The properties of these plasticizers have been evaluated by weight loss percentage in soybean oil. The various parameters have been calculated to correlate with their properties. The result showed that weight loss percentages are associated with steric parameters. It was also found that some of the new compounds showed better weight loss ability than traditional plasticizers.
Study on a Type of Environment-Friendly Underground Wet Shotcrete Support Materials
Authors: Zheng Xue Zhao , Xiao Yang , Zhang Qun , Jin Yong Fei
Published: July 2012

Most underground permanent roadways of coal mines need maintenance because of long service. Through selecting the proper ratio of fly ash, cement, water, and right amount of sodium silicate additives, the author made high content of fly ash cement wet shotcrete materials, and tested their main physical properties, mechanical properties and technical performance, a type of environment-friendly underground wet shotcrete is developed.
Experimental Study on the Fire Resistance of Rectangular Hollow Sections Steel Columns
Authors: Kwon In Kyu , Kim Heung Youl , Kim Hyung Jun
Published: July 2012

A fire occurring at a building causes severe damages to its structural members and brings unexpected collapse. Therefore, the building regulation of each nation has to define fire resistance to prevent building collapse due to high temperatures. In general, the fire resistance of each structural member can be evaluated by two methods. One is prescriptive method that is guided by a specific building regulation containing fire resistance examples or by the application of new examples tested fire experimental procedures. The other is performance based fire engineering design. Being an engineered and scientific method, it utilizes the results obtained from the calculation of fire severities, temperatures of members and so on. The easiest way to evaluate the fire resistance of a steel member is to compare its limiting temperature and maximum temperature. Therefore, constructing the database of the limiting temperatures of structural elements is very important in performance based fire engineering design. This paper is to derive the fire resistance and limiting temperatures of rectangular hollow sections under loads.
Preparation of Green Solar Reflective Coating with High Infrared Reflectivity
Authors: Sun Yuan Bao , Qiu Zhen Hui
Published: July 2012

The solar reflective green coating is prepared in the paper, of which the tailored infrared property reaches near upon 80%, and the temperature reduction bring by the reflectivity of the coat is improved too. The experiments on the temperature reduction and aging performance of the coat are also performed, the results suggests the green solar reflective coating can reduce more than 10°C compared with the same type coatings, it also has a good aging resistance capability.
Preparation of N-Methylpolyborosilazane -Derived Bulk Si-B-N-C Ceramics by Warm-Pressing and Pressureless Pyrolysis
Authors: Liu Zhen Quan , Zhang Jing , Qiu Xian Xing , Peng Yu Qing , Han Ke Qing , Yu Mu Huo
Published: July 2012

Additive-free bulk Si-B-N-C ceramics were prepared by pyrolysis of preceramic precursor (PBS-Me), which mainly involves cross linking, warm-pressing and pyrolysis. The density of crack-free bulk ceramic attains 1.94 g/cm3 when Calcined at 1300 °C. The shaped workpieces exhibit amorphous structure even be pyrolysised at 1400°C in N2, and there are some pores existing in the green body derived from warm-pressing and the resulting Si-B-N-C ceramic body, and these pores allow the gaseous byproducts be expeled from bodies. The pyrolyzed samples were studied by high temperature thermo gravimetric analysis, it shows that the Si-B-N-C body had an excellent high temperature resistance.
Preparation and Properties of Silicon-Containing Arylacetylene Resins with Octa(maleimidophenyl)silsesquioxane
Authors: Zhou Yan , Huang Fu Wei , Huang Fa Rong , Du Lei
Published: July 2012

Modified silicon-containing arylacetylene resins (DMSEPE-OMPS) were prepared from poly(dimethylsilyleneethynylenephenyleneethynylene) (DMSEPE) and Octa(maleimidophenyl)- silsesquioxane (OMPS). The curing reaction of DMSEPE-OMPS resin was studied by FT-IR and DSC techniques. Thermal stability and dielectric properties of cured DMSEPE-OMPS resins were determined. FT-IR and DSC analyses indicate that thermal polymerization of DMSEPE-OMPS resin occurs in the curing process. Thermal stabilities of cured DMSEPE-OMPS resins under N2 and air atmosphere decrease gradually with the increment of OMPS components. The incorporation of OMPS can obviously reduce dielectric constant of DMSEPE-OMPS resins.
Mechanical and Microstructural Analyses of Three Layered Cu-Ni-Zn/Cu-Zr/Cu-Ni-Zn Clad Material Processed by High Pressure Torsioning (HPT)
Authors: Oh Ki Hwan , Kim Hob Yung , Hong Sun Ig
Published: July 2012

Cu-Ni-Zn/Cu-Zr/Cu-Ni-Zn three layered clad plates were prepared by high pressure torsioning (HPT) at room temperature and theirmicrostructural and mechanical analyses wereperformed. No intermetallic compounds were observed at Cu-Zr/Cu-Ni-Zn interfaces in the as-HPTed and heat-treated Cu/Ni-Zn/Cu-Zr/Cu-Ni-Zn clad plates. The strength of as-HPTed clad plate reached up to 610 MPa with the ductility of 14%. After heat treatment at 500oC, Cu-Ni-Zn/Cu-Zr/Cu-Ni-Zn clad plate exhibited the strength up to 490 MPa and the ductility of 28 %. The clad plate fractured all together at the same time without discontinuous drop of the stress until final fracture. The excellent mechanical reliability and the good interfacialbonding strength can be attributed to the absence of detrimental interfacial reaction compounds between Cu-Ni-Zn and Cu-Zr.
Electrochemical Hydrogen Storage Performances of the Nanocrystalline and Amorphous Mg2Ni-Type Alloys
Authors: Zhang Yang Huan , Xu Chao , Yang Tai , Hou Zhong Hui , Zhang Guo Fang , Zhao Dong Liang
Published: July 2012

The melt-spinning technique is applied to the preparation of the nanocrystalline and amorphous Mg2Ni-type alloys with nominal compositions of Mg20Ni10-xMnx (x=0, 1, 2, 3, 4). The microstructures of the as-cast and spun alloys were characterized by XRD and HRTEM. The electrochemical performances of the as-spun alloys are measured by an automatic galvanostatic system. The results show that the as-spun Mg20Ni10 alloy displays an entire nanocrystalline structure, whereas the as-spun Mg20Ni6Mn4 alloy exhibits a nanocrystalline and amorphous structure, confirming that the substitution of Mn for Ni facilitates the glass formation in the Mg2Ni-type alloy. And the amorphization degree of the as-spun alloys substituted by Mn increases with the growing of the spinning rate. The substitution of Mn for Ni and the melt spinning ameliorate electrochemical hydrogen storage characteristics of the alloys substantially. The electrochemical discharge capacity and cycle stability of the alloys are considerably enhanced by increasing the amount of Mn substitution and the spinning rate. The high rate discharge ability (HRD) of the alloys first augments and then falls with the growing of the Mn content and the spinning rate.
Synthesis and Electrochemical Properties of a Novel Aniline-Based Polyorganodisulfide
Authors: Su Yu Zhi , Liu Xin Biao , Xie Si , Wu Yu Ling , Song Yu Fei
Published: July 2012

From facile preparation method and available low-cost raw materials, we have synthesized a novel kind of aniline-based organodisulfide bis(2-aminobenzyl) disulfide (OABD) and its homopolymer (POABD). The polymer POABD was characterized by Fourier transform infrared spectroscopy (FT-IR) and cyclic voltammetry. The cyclic voltammetry tests reveal that the redox of the S-S bonds behavior in the anodic and cathodic peak potentials differences for poly(bis(2-aminobenzyl) disulfide) is 70 mV. The results indicated that poly(bis(2-aminobenzyl) disulfide) has an excellent electrochemical reversibility.
Development of High High Chromium Steel Tube Steel by Converter-Bloom Continuous Casting Process
Authors: Chen Liang , Chen Tian Ming , Chen Yong , Yang Sen Xiang , Li Qing Chun , Zeng Jian Hua
Published: July 2012

In consideration of the composition characteristics and quality requirements of L80-3Cr high chromium Steel, the reasonable alloying system, temperature system and key technologies in continuous casting process are employed in the development of a full-line operation of LD-LF-RH-Bloom continuous casting on steelmaking with semi-steel, which meets the economic production of steel has been realized. The industrial tests show that the average effective rate of Cr is 98.2% in smelting process, and Cr content in steel products is consistent. T[O] content of rolled products is ranged from 10×10-6 to 16×10-6 with an average content of 13.5×10-6. Various inclusions of the products are no more than 1.0 level. There is good surface quality and internal quality of rolled products.
Study on the Surporting Mechanism of Precision Turning Process of Big-Diameter Length Rate Shaft by the Top
Authors: Zhang Guo Zhi , Fu Jun Jing
Published: July 2012

Deformation of shaft and turning process control mechanism were studied. When its clamping methods were different, its theoretical mechanics models were established. Based on probability theory, considering the randomness of cutting force, elastic modulus, its length and its diameter, its theoretical model was established to calculate its standard deviation of the roundness and typical parameters process systems were calculated. Moreover, its dynamic response finite element model was established, and the model was verified through comparison with the theoretical calculation results. The study provides the method and theoretical basis for the precision turning process planning.
Study on Squitter Pulsed Welding Repairing Technology of ZL105 Alloys
Authors: Shen Wei , Meng Ling Dong , Yuan Jin Ping , Di Yue Lan , Liang Zhi Jie
Published: July 2012

An experimental investigation of ac pulsed argon arc welding of the ZL105 alloy was carried out under the condition of existed the defects of the high temperature, the thermal deformation. The surface morphology, microstructure and temperature field of the surfacing layers were investigated. The results showed that the heat accumulation of squitter pulsed welding was less, and with smaller HAZ, crystal grains were thinner in the same conditions. Compared with argon arc welding, the energy of squitter pulse argon arc welding acted on the matrix was less but more centralized, the whole HAZ temperature raised slowly.
The FEM Dynamic Simulation in the Drilling Process with Indexable Inserts
Authors: Liu Lan Lan , Zhou Li Ping , Ying Zheng Jian
Published: July 2012

This paper is based on the platform of the FEM software deform-3D, using numerical simulation technology, the FEM model of drilling No.45 steel is established; the equivalent stress and temperature of the workpiece through the dynamic simulation of the drilling process with indexable inserts can be obtained. Moreover, the cutting force, radial force of carbide and torque suffered by the two blades during the drilling process was analyzed and forecasted. What else, the wear of the blade was evaluated.
Formation Mechanism of Hydrogen-Induced Delayed Cracking in Weld Center of High-Strength Steel
Authors: Zhang Jing Qiang , Yang Jian Guo , Wang Jia Jie , Liu Xue Song , Dong Zhi Bo , Wang Tao , Fang Hong Yuan
Published: July 2012

Based on the estimation of the critical hydrogen pressure and concentrations required for hydrogen-induced delayed cracking in high-strength steel, the conclusion that welded joints are hydrogen pressure microcracks body can be drawn under certain conditions. Through the analysis of the relationship between the microstructure evolution of welded joints, diffusion enrichment of hydrogen and cracking behavior, the formation mechanism of hydrogen-induced delayed cracking in weld center of high-strength steel joints is analyzed and the mechanism that stress induced the residual diffusion hydrogen gathered to promote the hydrogen pressure microcracks propagation is proposed. The research shows that the initation and propogation of hydrogen-induced delayed cracking in weld center can be divided into two stages, i.e. irreversible hydrogen damage stage and reversible hydrogen damage stage. In irreversible stage hydrogen pressure is the main causes of the initation of microcracks, while in reversible stage welding residual stress and residual diffusible hydrogen are necessary conditions for microcracks growth. The microcracks growth can be controlled by regulating welding residual stress.
FEA of Temperature Profile in the Ultrasonic Welded Joint
Authors: Zhang Jian Guang , Chawla Krishan.K. , Vaidya Uday.K.
Published: July 2012

In ultrasonic welding of fiber reinforced thermoplastic, heat is generated by means of interfacial friction at the interface to be bonded and internal friction of the polymer chains. A finite element model, using ANSYS software, was developed to calculate the transient temperature profile in glass fiber reinforced polypropylene joint in the transverse direction during ultrasonic welding. The results showed that the temperature in the joint increased with increasing weld time. With higher weld pressure, the temperature of molten point of polyprolylene can be reached within a shorter weld time. The weld map obtained from the finite model was in agreement with the results obtained experimentally.
Fabrication of Microchannels on SiC Substrate by Femtosecond Laser
Authors: Li Yi He , Xiao Hua , Li Gong Yi , Feng Jian , Li Xiao Dong
Published: July 2012

A novel femtosecond laser directly writing method was utilized to fabricate microchannels on silicon carbide (SiC) substrate. The micro patterns were transferred to a Polydimethylsiloxane (PDMS) stamp, characterized by both optical microscope and scanning electron microscope (SEM). The relationship between size (depth and width) of channels and power of laser pulse were discussed in detail.
Research on Lagging Melt Phenomenon and Influencing Factors of Flux Cored Arc Welding
Authors: Wang Yan
Published: July 2012

Lagging melt phenomenon is the special phenomenon of flux cored arc welding, studying lagging melt phenomenon is very valuable for the design and improvement of flux cored wire. Used digital camera technology, recorded the lagging melt phenomenon of acid、basic and metallic slag systems flux cored arc welding in CO2 protective atmosphere. Analyzed its mechanism and influencing factors of lagging melt phenomenon. The results shows that lagging melt phenomenon under low welding criterion is not obvious in comparison to high welding criterion but still shows lagging melt tendency. Under high welding criterion lagging melt degree increases and metal droplet separated from lagging melt flux core forms separated transfer. Under same welding criterion, lagging melt degree of basic slag system is maximum, acid slag takes the second place and metallic slag system is minimum.
Influence of the Process Variables on the Temperature Distribution in AISI 1045 Turning
Authors: Feng Yong , Wang Mu Lan , Wang Bao Sheng , Hou Jun Ming
Published: July 2012

High-speed metal cutting processes can cause extremely rapid heating of the work material. Temperature on the machined surface is critical for surface integrity and the performance of a precision component. However, the temperature of a machined surface is challenging for in-situ measurement.So, the finite element(FE) method used to analyze the unique nonlinear problems during cutting process. In terms of heat-force coupled problem, the thermo-plastic FE model was proposed to predict the cutting temperature distribution using separated iterative method. Several key techniques such as material constitutive relations, tool-chip interface friction and separation and damage fracture criterion were modeled. Based on the updated Lagrange and arbitrary Lagrangian-Eulerian (ALE) method, the temperature field in high speed orthogonal cutting of carbon steel AISI-1045 were simulated. The simulated results showed good agreement with the experimental results, which validated the precision of the process simulation method. Meanwhile, the influence of the process variables such as cutting speed, cutting depth, etc. on the temperature distribution was investigated.
Influence of EVA Content on the Properties of Extrusion Molding WPCS
Authors: Hu Xiao Hong , Li Dong Fang , Hu Ji Hang , Li Li
Published: July 2012

EVA was tried to improve the compatibility between wood flour and plastics substrate as a new kind of coupling agent. Infrared diffuse reflectance spectroscopy was applied to examine the changes in surface groups. The influence of the EVA content on the mechanical properties of WPCs was investigated and the morphologies of fractured surfaces were examined using a scanning electron microscope (SEM). Infrared diffuse reflectance spectroscopy shows that the EVA reduced the polarity of the wood flour. When the content of EVA is increased the mechanical properties of WPCs also increased. The SEM showed that EVA can help improve the interface compatibility between the fiber and plastic by aiding in the bonding of more plastic to the wood fiber. The comprehensive performance of the WPCs reached its maximum potential when the EVA level was at 15%.
Research on the Color Difference on Surface of 3104 Aluminum Alloy Stripes during Cold Continuous Rolling Process
Authors: Sun Jian Lin , Ding Guo Hong , Xia Lei , Yun Bing , Ji Ze Sheng
Published: July 2012

Color difference on surface of aluminum alloy stripes when lubricated with oil-water mixtures in cold continuous rolling process was researched. The surface profile, 3D and micro morphology were observed by surface surface profiler, laser scanning confocal microscopeand scanning electron microscope. The chemical composition of aluminum surface was analyzed by X-ray energy dispersive spectrometer, and then the formation mechanism of color difference was studied. The results indicate that lubricated with oil-water mixture, oil and water can't mix sufficiently and lubrication failure was found in deformation zone because of lubrication oil shortage. Working roller and fresh surface of stripes contacted directly and leaded to adhesive, so lots of irregular shaped micro-cracks were found after rolling, the residual composition of oil-water mixture adsorbed in the micro-cracks and not easy to be cleaned up, so the organic matter of residue composition carbonized and manifested as color difference in the visible. The fringes of color difference are distributed approximately along the rolling direction and the average roughness was very nearly the same between different kinds of fringes.
Research and Evaluation on the Machining Properties of Xylia Spp
Authors: Hu Li Wei , Su Chu Wang , Wang Ze Kun , Huang Jing Da , Li Qi Jian
Published: July 2012

In this paper, the machining properties of Xylia spp, compared with Castanopsis hystrix, were tested. Their properties were conducted according to the criteria ASTM D1666-87 and the test on crosscutting is referred to the method established by New Zealand Forest Research Institute. The results show as follow: the machining properties of Xylia spp and Castanopsis hystrix in the planning, sanding, boring, shaping and crosscutting show excellent, but the mortising properties was a bit poor. The properties of Xylia spp were in an all-round way better than Castanopsis hystrix. In the machining performance comprehensive evaluation system for full marks 50 points, its comprehensive marks were separately 45.5 points and 44.4 points.
Synthesis and Characterization of Zinc Oxide Tetrapods from Zinc Galvanization Dross
Authors: Sholehah Amalia , Yuwono Akhmad Herman , Permana Surya , Saleh Nuryadi , Waluyo Much
Published: July 2012

As an interesting material in large field area, ZnO synthesize has been widely observed. In this research, synthesize was carried out using zinc dross, waste from galvanization process, as starting material by simple heat treatment method. The as-synthesized ZnO obtained were further underwent post-anneal and post-hydrothermal treatment series. From the characterization data, it was found that highest crystallite size was obtained in sample treated with post-hydrothermal treatment at 150oC for 12 hours with value of 1371 nm, which corresponds to its lowest Eg value of 3,086 eV.
A Dynamic Contact Method in the LECEL Test for Heterogeneous Brittle Materials
Authors: Yang Yue Feng , Tang Chun An , Liang Zheng Zhao , Liao Zhi Yi
Published: July 2012

Based on dynamic contact force and FEM, the contact – separation process of collision was investigated. Compared with other methods, the dynamic contact method needn’t modify the general stiffness matrix, and increase any additional iterative computation. So there should be less computation and high efficiency. By building simulation model LECEI(the technique of loading edge cracks by edge impact), the propagation of branching cracks were simulated. Compared with existing research results, the method can be suitable to the impact model such as LECEI.
Study on the Thermal Fatigue and Anti-Melting Loss Properties of the H13 Steels with Surface Vapor Oxidation
Authors: Luo Yi , Wang Rong
Published: July 2012

H13 steel specimens with vapor oxidation surface treatment and without surface treatment, were carried out by thermal fatigue test and melting-loss test to research the effect of vapor oxidation surface treatment in the aluminum alloy die casting. The results show that the vapor-oxidized specimens have better erosion resistance and similar thermal fatigue resistance to those without surface treatment. Compound layer and compact layer form in melting-loss test are mainly Fe2Si2Al8 and Fe2Al5, respectively.
Preparation of Hydrotalcite-Like Catalysts Supported by Mo under Microwave and its Catalytic Properties for Phenol Hydroxylation
Authors: Shi Feng Wei , Hu Jiang Lei , Zhang Long
Published: July 2012

Under microwave irradiation, the ternary CuMgAl-HTLcs precursors were synthesized and MoO42-was loaded on the surface of these HTLcs. The results of XRD, FT-IR and SEM analysis indicated that the Mo anion was successfully loaded on the surface of the CuMgAl-HTLcs precursors. The activity of CuMgAl-31 for phenol hydroxylation was the highest, the conversion of phenol was 42.88% and ratio of catechol to hydroquinone was 2:1. CuMgAl-Mo-HTLcs advantageously increased the selectivity of hydroquinone with the ratio of hydroquinone to catechol reaching to 6:1 and about 4% conversion decreasing. Proposed the reaction mechanism of phenol hydroxylation by MoO42-supported HTLcs.
Tribology Study of Nanodiamond Hybrid Polyurethane/Epoxy Interpenetrating Polymer Networks Materials
Authors: Xia Shao Ling , Zhang Lin Qi , Wang Dong Mei , Zou Wen Jun , Peng Jin , Cao Shao Kui
Published: July 2012

Tribology behavior of Nanodiamond(ND) polyurethane(PU)/epoxy(EP) interpenetrating polymer networks hybrid materials were tested by friction wear testing machine. Results showed that when EP content was 30%, resultant PU/EP IPNs exhibited best wear resistance. For ND-PU/EP IPNs hybrids, when the ND addition was 0.2wt%, the best wear resistant ability was obtained. Under dry condition, the effect of wear parameters, such as rotational speed, load and central distance to friction and abrasion value were also investigated.
The Preparation of Graphene via Thermal Reduction Method
Authors: Wang Jian Fang , Lv Ya Nan , Long Yin , Tao Cheng An , Zhu Hui
Published: July 2012

In this paper, the graphene oxide reducing by photochemical-thermal reduction and high-temperature thermal reduction was studied to get qualified graphene and avoid the re-aggregation. The results show that graphene obtained by both of the two reduction methods all maintained the original well-layered morphology of the graphene oxide. The graphene had smooth surface and high quality as completely reduced by high-temperature thermal method. However, the reduction the photochemical-thermal reaction was not sufficient and caused many vesicles on the graphene surface due to the low temperature and the lack of reaction time.
Nonlinear Vibration Analysis of Fiber Movement
Authors: Shen Dan Feng , Zhao Hui
Published: July 2012

This paper adopts nonlinear vibration method to analyze the fluctuation process of fiber movement. Based on Hamilton Principle, this paper establishes differential equation of fiber axial direction movement. Using variable-separating method, this paper separates time variable from space variable. By using the disperse movement equation of Galerkin method, this paper also discusses the stable region of transition curve and points out those influencing factor and variation trend of fiber vibration.
Hydrothermal Preparation of B-Doped TiO2 and Photodegradation of Salicylic Acid under Visible Light
Authors: Liu Xiao Lin , Guo Wen Lu , Ma Jing Jing
Published: July 2012

B-doped TiO2 nanoparticles have been successfully prepared using hydrothermal synthesis with tetrabuttyl titanate and boric acid as precursor. The prepared samples were characterized by X-ray diffraction (XRD), UV-vis diffuse reflectance spectra (UV-vis DRS), scanning electron microscope (SEM). The B-doped TiO2 nanoparticles were red-shifted than P25. And the degradation rate of B-TiO2 is 72.62% in 120 min by degradation of salicylic acid under visible light irradiation.
The Construction and Application of Interatomic Potential in FeAl Alloy by the Finnis-Sinclair Many-Body Potential Model
Authors: Wang Yue Hua , Liu Yan Xia , Wang Xun , Shan Ya Na , Zhai Zhong Hai , Wang Zhi Yong
Published: July 2012

The Finnis-Sinclair many-body potential model was utilized to construct the interatomic potential function in B2 type FeAl alloy at equilibrium state. According to the model, the binding energy, the elastic constants C11, C12 and C44 were calculated, and the results agree well with the experimental results. The formation energy of different defects, such as monovacancy and anti-site, in the B2 FeAl alloy were also studied.
Study on the Formula of the Environmental Friendly High Temperature Type PVC Sheathing Compound
Authors: Tian Feng , Ni Yan Rong , Zhang Kai Tuo , Su Chao Hua
Published: July 2012

The formula of the environmental protection PVC sheathing compound used for wires and cables contains: the base resin, composite stabilizer, plasticizer, filler, antioxidant and lubricant. Each component’s effects on the performance of the sheathing compound were studied. The optimized formula was established as: 100.00 phr PVC , 6.80 phr Ca/Zn stabilizer, 36.30 phr TOTM, 14.0.80phr DIDP, and 30.50 phr heavy calcium carbonate agent. The product properties were demonstrated by a series of experimental means. The results indicate that this formula system contain neither heavy metals such as lead, cadmium, hexavalent chromium and mercury, nor polybrominated biphenyls and their ethers, which can cause significant damage to people and the environment. The product property completely meets the performance standards set for the environmental protection 105 °C PVC sheathing compound.
Research on Low-Phosphorus Steel Melting by Semi-Steel
Authors: Chen Jun , Liang Xin Teng , Zeng Jian Hua , He Wei
Published: July 2012

In this study, double-slag method is used to melt low-phosphorous steel by semi-steel. The results show that, the average phosphorous content of the aimed molten iron of BOF is 0.0052% and after the first slag pure-out, the dephosphorization rate is 56.2%, while the total dephosphorization rate of BOF melting is 92.46%, rang from 91% to 93.4%. Low phosphorous content alloy and slag-stopping tapping technology is adopted and rephosphorization of molten iron is controlled in 0.002%. Finally the average phosphorous of the finished product is 0.0064%, range form 0.0055% to 0.0071%, which means that Pangang Group can produce the steel with phosphorous content is less than 0.008%.
Research on CrN-Based Ternary Films Deposited by Magnetron Sputtering
Authors: Di Yue Lan , Cai Zhi Hai , Zhang Ping , Shen Wei
Published: July 2012

Different Mo content of ternary Cr-Mo-N films were deposited on steel substrates using closed-field unbalanced magnetron sputtering technique using Cr target and Mo target in N2/Ar gaseous mixture. The composition, structure, surface morphology and valence states of ternary CrMoN films were tested by EDS, XRD, SEM and XPS respectively. The experimental results showed that the preferential growth orientation of CrMoN films was changed from CrN (220) to (200) after the addition of Mo element. The diffraction peak shifted leftwards as a function of Mo content, The synthesized CrMoN coatings formed a substitutional solid solution of (Cr,Mo)N where larger Mo atoms replaced Cr in CrN crystal. The mechanical property experiments were carried out on the nanotest 600 hardness-testing device. The hardness of CrMoN films enhanced for the synergistic effect of CrN and MoN hard phases
The Influence of Cr-Coating on the Thermal Conductivity of Diamond/Cu Composites
Authors: Kang Qi Ping , He Xin Bo , Ren Shu Bin , Qu Xuan Hui
Published: July 2012

Diamond/Cu composites were fabricated by pressure infiltration method with Cr coating onto the diamond particles. The major challenge in the development of these composites is to obtain a well bonded interface between diamond particles and Cu. In this paper, an effective way to apply molten salt method coated chromium on diamond particles was used to solve the interface problem. The results showed that the bonded interface thickness of about 1μm was obtained. The relative density and thermal conductivity of coated composites were 99.5% and 396W/m K respectively, which were remarkably enhanced compared to that of uncoated composites.
In Situ Growth of Superhydrophobic Films on Aluminum Substrate
Authors: Liang Jin , Chen Hong , Fan You Hua , Yuan Zhi Qing
Published: July 2012

A facile and novel method was developed to fabricate highly porous CeO2 surface on aluminum via a combination of homogeneous precipitation method and in situ growth process. After the introduction of CeO2 film, aluminum exhibited excellent superhydrophobicity with contact angle of 152.9±1.5 o and a sliding angle of 5 o. SEM image of the film showed that the resulting surface exhibits a hierarchical micro-Superscript text and nanostructure, which comprised of nanoleaves that grew perpendicular to the substrate and interleaved together to form a highly porous structure. This porous architecture, along with the low surface energy renders the aluminum superhydrophobicity.
Research on Inhibition Marine Microbial Adherence of a Novel Nano-TiO2 Coating on Aluminum
Authors: Liu Tong , Li Qiang
Published: July 2012

A novel nano-TiO2 coating is prepared by vacuum dip-coating TiO2 sol–gel onto the anodized aluminum surface. The particles of TiO2 anatase is ﬁlled into the Al2O3 nano-pores formed by anodization. The structure and composition of the coatings are characterized by means of scanning electron microscopy (SEM) and X-ray diffraction (XRD). The preponderant bacterium is identified as Pseudomonas lindanilytica strain IPL-1 through analysis of the sequences of S16 nRNA gene segment. In addition, the electrochemical results show that the TiO2 coatings significantly reduce the corrosion rate of Al substrates. The UV reflection spectroscopy is used to determine and analyze that the nano-TiO2 coatings could improve the light photo catalytic activity which decreases microbial influencing corrosion acceleration inhibition (MICI).
Experimental Research on PVDF Membranes Prepared by Supercritical CO2-Induced Phase Inversion
Authors: Liu Xue Wu , Du Yong Qiang , Tang Jie
Published: July 2012

Microporous polyvinylidene fluoride (PVDF) membranes were prepared by supercritical CO2-induced phase inversion. The structure and morphology of prepared PVDF membranes were characterized by SEM. The effects of processing parameters such as CO2pressure, temperature and PVDF concentration on the membrane morphologies, pore size distribution and especially on the porosity of the membranes were investigated. The results showed that when the PVDF concentration was between 15-35wt.%, the temperature and the pressure were respectively in the range of 35-60°Cand 8-16MPa, the prepared PVDF membrane showed a cellular structure; the porosity changed in the range of 55.2~85.7% and showed a peak valuewith the increase of temperature, CO2pressure and PVDF concentration. The effects of process parameters on the membrane porosity were explained based on the properties of supercritical fluids.
Microstructure and Protertise of Self-Lubricative Ceramic Coatings on Carbon Steel by PEO in Aluminate Electrolyte Containing Graphite
Authors: Wang Yun Long , Wang Miao , Jiang Zhao Hua
Published: July 2012

Self-lubricative ceramic coatings were prepared on Q235 carbon steel by plasma electrolytic oxidation (PEO) in aluminate electrolyte containing graphite. The microstructure of the PEO coatings were examined. Influence of graphite in electrolyte on the coating growth properties was analyzed according to the voltage vs. time plots. Effect of graphite concentration on the properties of the coatings such as bonding strength, surface roughness and thickness were studied. The tribological behavior of the coating was primarily evaluated.The results showed that the self-lubricative coatings consisted of FeAl2O4, Fe3O4 and a certain amount of graphite. With increasing the concentration of graphite in the electrolyte, the coating growth gradually became stable with lower breakdown voltage and end voltage. The bonding strength and the thickness of the coating were not strongly affected by the graphite concentration whose value remained approximately 19Mpa and 110μm, respectively. With increasing the graphite concentration, the surface roughness first decreased and then increased a little. The friction coefficient of the coatings also varied with the concentration of graphite. When the concentration of graphite was 8 g/l, the tribological property of the coatings was the most excellent with the friction coefficient bellow 0.1.
Cyclic-Oxidation of RexOy-Modified Aluminide Coating
Authors: Wang Yong Dong , Zhou Yue Bo
Published: July 2012

Reactive reactive element oxide RexOy (Re=Ce, Y)-modified aluminide coatings were developed by aluminizing the as-codeposited Ni-RexOy composite film using pack cementation method at 1100°C for 4 h. By comparison, aluminizing was also performed with the same condition on an as-deposited Ni film without RexOy particles. SEM/EDAX and TEM results indicated that the co-deposited CeO2 or Y2O3 particls were homogeneously dispersed in the finer-grain nanocrystalline Ni grains. The cyclic oxidation in air at 900°C indicated that the RexOy -modified aluminide coatings were profoundly spallation resistance as compared to the RexOy -free coatings due to the formation of a continuous adherent α-Al2O3 scale.
Microstructure and Wear of Cr/WC- Ni60 Based Composite Coating by Vacuum Sintering
Authors: Dong Zhi Hong , Fan Hong Yuan , Qian Yang Shun
Published: July 2012

WC-Ni60 composite powders were mixed and deposited on Cr12MoV die steel by vacuum sintering technique. In order to prevent WC powders decomposition at the high temperature, Cr film was coated by D.C. magnetron sputtering and then prepared Cr/WC-Ni60 composite coating. The structure and composition and microhardness were measured by SEM and XRD and hardness tester. Tribological experiments were carried out on an abrasion machine. The results showed that thickness of Cr film is 3~5um. Some WC particles formed hard phases in nickel based solid solution to improve the hardness of the coatings. Due to Cr film preventing WC decomposition, Cr/WC-Ni coating had the higher hardness values compared with WC-Ni60 coating. The coating surface was uniform and compact and had no cracks. During the sliding wear, Cr/WC-Ni coating had a better wear resistance, and mass loss of wear was the least.
Effect of Austenitization Temperature on Phase Transition Features of High Cr Ferritic Heat-Resistant Steel
Authors: Gao Qiu Zhi , Liu Yong Chang , Di Xin Jie , Yu Li Ming
Published: July 2012

The phase transformation of high Cr ferritic heat-resistant steel has been investigated by using differential scanning calorimeter and predicted by Thermo-calc calculation. The steel specimens were hot rolled and followed by air cooling, and then heated from room temperature up to different austenitization temperature as 800°C, 900°C, 1000°C and 1100°C. The DSC curves during heating process showed that the magnetic transition temperature and the Ac1 temperature are 744.9°C and 850.9°C, respectively. The austenitization range was about 58°C. The onset and offset temperature of martensite transformation both increase with the increase of austenitization temperature. The experimental results and the Thermo-calc calculated results both displayed that M23C6 carbides precipitated at around 950°C, and δ-ferrite started to form at about 1020°C.
Study of Effect and Protection for Corrosion on Buried Pipeline by AC Interference
Authors: Zhang Li Jing , Pan Yi Wei , Tao Gang , Wang Yi Min , Li Yuan
Published: July 2012

Small-scale experiments were conducted to evaluate the corrosion on buried pipeline by AC interference. The results showed that stray current, pH and conductivity are significantly influenced the pipeline corrosion rate according to the response surface methodology (RSM) . The corrosion rate of buried pipeline greatly increased with the increase of stray current. The corrosion rate of most specimens first decreased and then increased slightly with the rise of pH. The corrosion rate of most specimens first decreased and then increased with the rise of conductivity in acid soils, but contrary in neutral and alkaline soils. Most of the specimen surface was covered with different sizes of reddish-brown bumps corrosion products in the acidic solution and reddish-brown, black corrosion products in the alkaline solution, but the specimen surface was smooth in the neutral solution. Because of economic and environmental factors, the AC interference is not always achievable. Therefore, comprehensive approaches should be taken for AC interference protection.
Microstructure and Corrosion Resistance of Fe-Based Amorphous Coating Prepared Atmospheric Plasma Spraying
Authors: Zhao Xiao Bing , Ye Zhi Hui
Published: July 2012

Fe-based amorphous coating was prepared on stainless steel substrates by atmospheric plasma spraying (APS) using Fe-based amorphous powder as feedstock. Microstructures of the coating were investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM). The corrosion behavior of coating and stainless steel were evaluated respectively in 3.5% NaCl, 10% NaOH and 1 mol/L H2SO4 aqueous solutions by electrochemical workstation. The results indicated that the coating was composed of most amorphous phase and some Fe-Cr crystalline phase. The coating exhibited the better corrosion resistance in H2SO4 solution, while the worse in NaOH.
Electroless Ni-B Alloy Plating from DMF at Room Temperature
Authors: Wang Jian Chao , Wang Shu Hai , Ye Guang , Zhai Bo
Published: July 2012

A new basic solution for eletroless Ni-B alloy plating from DMF was studied. The effects of composition and operating conditions on the rate of deposition of Ni-B alloy have also been discussed. The alloy component was analyzed by EDS and Inductively Coupled Plasma (ICP). The plating rate is determined by electronic balance. And structures of the plating coatings were investigated by means of scanning electron microscopy (SEM) and X-ray diffraction (XRD).The optimum composition and operating conditions for abstaining satisfied Ni-B alloy coating are provided.
Microstructural and Magnetic Properties of C/FePt/Ti Films by Facing Sputtering
Authors: Xu Jia Ling , Jia Li Yun , Fan Hong
Published: July 2012

C/FePt/Ti nano-thin films were prepared by DC facing-target magnetron sputtering system onto glass substrates at room temperature and subsequently in situ annealed for 500 °C 30 min in vacuum. The influence of C capping layer on microstructural and magnetic properties of the FePt films were investigated in detail. Atomic force microscopy (AFM) images indicate that C can effectively isolate the particles, refine particle, and distribute; however, the particle size distribution is uneven for too much C. The easy magnetic axial orientation is changed with the C layer thickness.
Nano-Silica Reinforced UV-Curable Hybrid Hard Coatings on Polymethylmethacrylate (PMMA) Substrate
Authors: Sun Xiao Ying , Wang Jianan , Hang Jian Zhong , Jin Lu Jiang , Shi Li Yi
Published: July 2012

Hybrid sols were synthesized through a combination of hydrolysis and condensation reactions of tetraetoxysilane and γ-Methacryloxypropyltrimethoxysilane together with the addition of a colloidal silica suspension. A transparent, hard UV-curable hybrid coatings based on hybrid sols were prepared in order to improve the scratch and abrasion resistance of PMMA substrate. The effects of the content of colloidal silica suspension on pencil hardness, transmittance, and haze were investigated. The pencil hardness of all coating films in this study can be tuned from 4H to 9H, whereas that of uncoated PMMA substrate is 1H. The higher hardness of the coatings can be attributed to the dense structure induced by the increase of network density with the addition of colloidal silica suspension. Furthermore, it is found that the transmittance of coatings slightly fluctuates between 91.8% and 93.6% with increasing colloidal silica content. These results indicate the good compatibility of the organic and inorganic components.
Influence of Atmospheric Pressure Air Glow Plasma Treatment on Capillary Effect of Cotton Fabric
Authors: Zhang Qiu Zhu , Zhao Qi Ming
Published: July 2012

Atmospheric pressure air glow plasma processing technology was used to treat the cotton fabric surface to improve its wettability. Based on the second-order regression general rotation design, influence of the plasma processing time, current intensity and the discharge distance on the capillary effect of cotton fabric was investigated with the capillary height as the index. The test results show that the optimal process is the processing time 20.2min, the current intensity of 1.84A, and the discharge distance 11.2mm. With the same total processing time, the cotton fabric with double-sided plasma treatment is better than that of single-sided processed.
Application of Electrochemical Techniques in the Porosity Assessment of Electroless Coatings
Authors: Xu Yang , Zou Yong , Luan Tao
Published: July 2012

Chemical and electrochemical techniques were applied to evaluate the porosity of various electroless coatings (single-layer coating, multilayer coating and ternary coating). The electrochemical techniques include linear polarization resistance and Tafel extrapolation method. The effects of these techniques were compared. It’s evident that electrochemical methods performed better than chemical method when they were applied to assess the porosities of coatings with very fine through pores.