bluuebunny/crossref_metadata_2025 huggingface dataset:
Profiling Analysis of the Seeds of Vaccaria segetalis (Necr.) Gracke by HPLC-ESI-MS
Authors: Zhang Hai Jiang
Published: December 2011

In this paper, HPLC-ESI-MS technique was used to analyze the methanol extract of the seed of Vaccaria segetalis (Necr.) Gracke, known as Wang-Bu-Liu-Xing in traditional Chinese medicine. By the studies of MS and MS/MS spectra and the comparison with reference compounds, five main constituents were identified, including hypaphorine, vaccarin, isosaporarin, isovitexin 2''-O-arabinoside and vaccarin H.
Research of Mo Powder’s Densification during Sintering
Authors: Liu Ren Zhi , Wang Kuai She , Sun Yuan Jun
Published: December 2011

Mo powder was pressed into rods by cold isostatic pressing and sintered by multi-function furnace. Physical and chemical properties of sintering samples at different temperature were tested such as chemical elements, density, area shrinkage ratio and fracture surface morphology. Through the investigation we can draw the conclusions as following: Mo powder softens at 1353K. The temperature of beginning metallization is 1833K. In the range of 1713K~1953K, impurity contents such as C and O drop down fast and density increases sharply. When sintering temperature rises from 1833K to 1953K, the grains of sintering rods are fine. When the sintering temperature surpasses 2073K, the grains grow up very fast. The sintering shrinkage ratio enlarges quickly.
Synthesis and Magnetic Properties of Poly(Schiff Base) Complex Containing 4,7-Disubstituted-1,10-Phenanthroline
Authors: Zheng Ren Hua , Jiang Hua Jiang , Shen Qun , Guo Hai Chang
Published: December 2011

A novel poly(Schiff base) containing 4,7-disubstituted-1,10-phenanthroline (BAPcBDA) was synthesized by the polycondensation of 4,7-Bis(4-aminophenoxy)-l, l0-phenanthroline (BAP) with 4,4'-Biphenyldicarboxaldehyde (BDA). The polymeric complex was first prepared by the reaction of polymer (BAPcBDA) with NiSO4. The structures of the monomer and polymer were characterized by IR,1H-NMR, and elemental analysis. The magnetic behaviors of the complex were measured as a function of magnetic field strength (0-50 kOe) at 5 K and as a function of temperature (5-300 K) at a magnetic field strength of 30 KOe. The results show that BAPcBDA-Ni2+exhibited the features of an antiferromagnet.
The Best Solution for Removal of Iron and Oil from Hot Condensed Water
Authors: Leng Chun Yin
Published: December 2011

This thesis illustrate the effect of reusing high-temperature condensed water thermal energy and the characteristics of the methods about removing iron and oil from high-temperature condensed water , eventually propose the using of the heat-resisting NF and RO membrance system as the best choice of all methods.
Cation-Exchange Membranes Prepared by Pre-Irradiation Grafting of Acrylic Acid and Sodium Styrene Sulfonate onto ETFE Membranes
Authors: Zu Jian Hua , Xia Min , Shi Fu Xia , Liu Rui Qin
Published: December 2011

Poly (ethylene-co-tetrafluoroethylene) (ETFE) membranes were irradiated by electron beams and then acrylic acid (AA) and sodium styrene sulfonate (SSS) were grafted onto the membranes, in an attempt to prepare cation exchange membranes containing -COOH and -SO3Na groups. The grafting yield was found to be strongly dependent on the synthesis condition such as irradiation dose, co-monomer composition. Infrared spectroscopy of the grafted membrane confirmed the existence of sulfonate and carboxylic acid groups. The membrane resistance decreases with the increasing of grafting yield
Preparation of RHA-Paraffin Phase Change Materials
Authors: Wang Jun , Ma Bao Guo , Zhang Jian Liang , Yang Wen
Published: December 2011

In this paper, a kind of RHA-paraffin phase change material was prepared, and the SEM was used for observing its internal morphologies, DSC analysis was carried out for detecting its temperature and enthalpy of phase transition. The results showed that rice husk ash have a greater absorption rate for paraffin; a large number of pores of the RHA were filled by paraffin in the RHA-paraffin phase change material, and the absorption rate can reach 53.5%.
Evaluation of Relationship between Innitial Current, Conductance, Chloride Diffusion Coefficient and Charge Passed of Concrete
Authors: Hu Yan Jun , Du Yan Liang , Zhang Wei
Published: December 2011

In this study, plain and mineral admixture (slag, fly ash and silica fume) modified concrete prisms were made with three water-to-binder ratios (w/b), and four test methods (Rapid Chloride Permeability Test-ASTM C1202-91, AC Conductance Test, 150-days Ponding Test, Alternate Wetting and Drying Test by cyclic loading with salt solution and drying) were employed to measure the concrete prisms’ chloride penetrability. The effects of mineral admixtures on the concrete chloride permeability were discussed, and the correlation of results separately obtained from the four test methods were analyzed. The experiment results indicate that blending concrete is beneficial with regard to the resistance against chloride ion penetration, and good linear ralationship between charge passed and innitial current, charge passed and conductance, charge passed and chloride diffusion coefficients by 150-days Ponding Test, charge passed and diffusion coefficients by Alternate Wetting and Drying Test were obtained.
Synthesis of Cordierite from the High-Alumina Fly Ash and Talc Powder Mixtures
Authors: Chen Jiang Feng , Guo Guo Peng , Shao Long Yi
Published: December 2011

There is much more profit in synthesis of cordierite from high-alumina fly ash, comparing with common fly ash. In this paper, the high-alumina fly ash collected from the Jungar power plant was calcined, grinded, beneficiated with HCl, diluted and dried. Furthermore, the cordierite was conducted from the purified fly ash and talc powder mixtures by solid reaction sintering. The physical properties of the cordierite samples were measured using Archimedes’ method, and the phase of cordierite samples was analyzed by XRD and the microstructure of the cordierite samples was observed by SEM. The results show that the cordierite, based on the proportion of the treated high-alumina fly ash and talc powder designated as 1.515/1 at 1350°C or/an 1370°C for 2h or/and 3h, could meet the quality requirement of physical properties, and the major crystalline phases in the sintered samples were predominantly α-cordierite (indialite) with minor crystals of mullite, spinel and almost no glassy matter.
A New Ecofriendly Cold Ramming Paste for the Aluminum Electrolysis Cell
Authors: Zhou Yang Min , Tian Lin , Xie Gang , Li Rong Xing , Yu Xiao Hua
Published: December 2011

Cold ramming paste was successfully synthesized used electro-calcined anthracite (ECA) and artificial graphite as aggregate and phenol-formaldehyde (PF) resin as binder. Synthesized paste was measured by electrical resistivity, compressive strength, Infrared Spectrum (IR) and Thermo Gravimetry (TG), etc. The results show that the synthesized paste has some excellent physical properties such as low electrical resistivity and high compressive strength, all of which can meet industry requirements. Thermal decomposition and condensation of the paste can be divided into four stages by TG. Finally, it is found that the synthesized cold ramming paste is an ecofriendly material by the toxicity measurement of gas phase escaping from the heated paste
Properties of Concrete Containing Scrap-Tire Chips
Authors: Tang Wai Ching , Cui Hong Zhi , Lo Yiu
Published: December 2011

Nowadays, one of the most essential environmental issues around the world is to deal with the scrap tire problem. Tires that are used, rejected or unwanted are classified as scrap tires and need to be managed responsibly. In this paper, the scrap tires were shredded into pieces and used to mix with normal weight concrete. Extensive laboratory tests were carried out and the focus of this paper was to characterize the mechanical and permeability properties of concrete containing scrap tires. The main parameters studied were chipped tire content and size. The results showed that the scrap-tire chips without adding special bonding agents apparently showed an even distribution in the mortar and concrete matrix. The elastic modulus, compressive and tensile strengths of scrap tire concrete in general were found lower than that of the control concrete and the differences became significant when the content and size of chipped tires in the mix were increased. Besides, the coefficients of water permeability of concrete were found to increase with increase of chipped tires in the mix.
Study on the Effect of Amphoteric Bagasse Hemicellulose on Heavy Metal Adsorption
Authors: Wang Li Jun , Liu Xin Liang , Weng Meng Ling , Li Shuang Xi , Wu Fu Sheng , Li Zhou Jun , Wang Shuang Fei
Published: December 2011

In this paper, ions i.e. Cu2+, Pb2+and Cd2+ were absorbed by the amphoteric bagasse hemicelluloses, and the influences of pH value, adsorption time and the initial concentration of metal ion have been studied. The results show that the optimal adsorption pH values for Cu2+, Pb2+ and Cd2+ are 6.5, 6.0 and 7.5, respectively. The adsorption capacity to ions Cu2+, Pb2+ and Cd2+ reaches the maximum values when the adsorption time is 180 min. Net adsorption to ions Cu2+, Pb2+ and Cd2+ increases with increasing the initial concentration of the metal ions. Analysis results of adsorption dynamics show that the adsorption of Cu2+, Pb2+ and Cd2+ follows Ho 's Pseudo second-order kinetics linear model. It can be seen from the adsorption isothermal research that absorption of the amphoteric bagasse hemicelluloses to ions Cu2+, Pb2+and Cd2+ can be well described by the Langmuir isotherm linear model. Moreover, the theoretical values of the maximum absorption capacity qmax for ions Cu2+, Pb2+ and Cd2+ were determined to be 21.98 mg/g, 81.97 mg/g and 31.85 mg/g, respectively.
Study on Preparation and Near-Infrared Reflective Properties of NaZnPO4
Authors: Zhong Ming Feng , Fu Wen Xiang , Da Wang , Su Da Gen
Published: December 2011

NaZnPO4was prepared by heat-treating precursor with Zn(NO3)2٠6H2O、H3PO4and anhydrous sodium carbonate as raw materials by co-precipitation method, and it was characterized with UV/VIS spectrophotometer、X-ray diffraction (XRD). The experiment results shown that the near-infrared reflection property of NaZnPO4was very good. when the heat treatment temperature of preparation of NaZnPO4was range from 400°C to 800°C, near-infrared reflection properties of products were similar. Among them, the products with the heat treatment of 600°C has the best near-infrared reflection property,which is reached up to 95.2% in average,while the near-infrared reflection of TiO2is 74.1% in average.
Grinding Aid Effect of Different Siliceous Material for Quick Lime
Authors: Ni Tie Quan , Ke Chang Jun , Wang Hao , Wu Wei Zhou
Published: December 2011

Different siliceous materials were selected for grinding aid agent to studying the effect for specific surface areas of quick lime and autoclaved samples compressive strength. The results show, grinding aid effect of quartz sand, waste lime sand brick and fly ash are significant for block quick lime. The rational contents of grinding aid agent are about 10%. And grinding aid effect of quartz sand is best. The compressive strength of autoclaved samples improved obviously with lime mixed the grinding aid agent, and the compressive strength increased range of autoclaved sample is more than 50%. The effect of different grinding aid agent for improving compressive strength of autoclaved samples is obviously different, and the improving strength effect of fly ash is best for grinding aid agent.
Effect of Deformation Degree and Diameter Ratio on Performance of Hadfield Steel during Cold Asynchronous Rolling
Authors: Wang Yan Feng , Qiu Chang Ming , Deng Li , Sun Xiao Hua
Published: December 2011

Hadfield steel is wear-resisting steel and widely used where the devices have high impact wearing performance requirements. Cold asynchronous rolling technique can improve the mechanical performances of high manganese steel to a certain degree. Through experimental research, this paper studied the effect of deformation degree and diameter ratio on its mechanical performances during asynchronous rolling.
Investigation of Ni-Mo-P Coating Electrodeposition under Stabilized Magnetic Field and its Hydrogen Evolution Activity
Authors: Han Jiang Xue , Bian Ying Xiang , Su Xin , Liu Ji Bao , Wang Bai Lin , Peng Tian Quan , Yang Zhong Dong
Published: December 2011

Through the application of parallel and vertical magnetic field, which range from 0T to 1.0T, the effects of electromagnetic field in electrodepositon process to prepare Ni-Mo-P coating on its micro-morphology, alloying component, crystal structure and hydrogen evolution activity were investigated. The results showed that the surface of Ni-Mo-P coating obtained was smooth with less ball cellular depositions under an external vertical magnetic field. The coating showed more ball cellular depositions, and the number of which increased gradually with the increasing of the magnetic field intensity under an external parallel magnetic field. The content of Mo increased slightly and the plating structure has switched from transition state into the amorphous state with applied magnetic field. Ni-Mo-P coating obtained with parallel magnetic field had the highest hydrogen evolution activity, while the hydrogen evolution activity decreased under Vertical magnetic field.
Fabrication and Photocatalytic Performance of Bi2O3 Doped with Fe3+
Authors: Zeng Jun , Zeng Feng Chun , Zhong Jun Bo , Li Jian Zhang , Wang Shao Hua , Hu Wei
Published: December 2011

In this paper, Bi2O3 and Fe3+-doped Bi2O3 photocatalysts with different molar ratio of Bi /Fe (nBi:nFe =100:1,2,3,4) was prepared by paralled flaw co-precipitation method. The prepared photocatalysts were characterized by Brunauer-Emmet Teller (BET) method, X-ray diffraction( XRD) and UV-Vis diffuse reflectance spectroscopy. The results show that 3% Fe3+-Bi2O3 prepared has the highest BET surface area, pore volume, the smallest pore size and the particle average size. 3% Fe3+-Bi2O3 exhibits the best photocatalytic activity. The results of further experiments show that the specific surface area, UV-Vis diffuse reflectance all play an important role in promotion of photocatalytic activity of Bi2O3 nanostructure.
Facile Synthesis of New Nanocomposite Based on Cobalt Oxide and Carbon Nanotubes with Excellent Electrochemical Capacitive Behavior
Authors: Luo Gang , Zhang Shi Chao , Fang Hua
Published: December 2011

A new two-step synthesis of composite electrode based on carbon nanotubes (CNTs) and cobalt oxide (Co3O4) by electrophoretic deposition of CNTs on Ni foam followed by electrodeposition of cobalt hydroxide on CNTs electrode and heat treatment to form Co3O4/CNTs composite electrode was developed. The structure and morphology of the electrodes were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Their electrochemical performances were evaluated by cyclic voltammetry (CV), galvanostatic charge-discharge and electrochemical impedance spectroscopy (EIS). Experimental results indicated that the nanocomposite electrodes exhibitd excellent pseudocapacitive behavior. In the potential range of 0.1- 0.45 V(vs SCE), the nanocomposite electrode showed a high specific capacitance of 867 F•g-1 in 6 M KOH electrolyte and a capacity retention of 90% after 1000 cycles at a current density of 1 A•g-1.
Enhanced Electrochemical Hydrogen Storage Characteristics of Mg2Ni-Type Alloy by Substituting Mg with La
Authors: Ren Hui Ping , Li Bao Wei , Zhang Yin , Pang Zai Guang , Hou Zhong Hui , Zhang Yang Huan
Published: December 2011

The melt-spinning technique is applied to the preparation of the nanocrystalline and amorphous Mg2Ni-type alloys with nominal compositions of Mg2-xLaxNi (x=0, 0.2, 0.4, 0.6). The as-spun alloy ribbons possessing a continuous length, a thickness of about 30 μm and a width of about 25 mm were prepared. The structures of the as-spun alloy ribbons are characterized by XRD, SEM and TEM. The electrochemical performances of the as-spun alloy ribbons are measured by an automatic galvanostatic system. The results show that no amorphous structure is detected in the as-spun Mg2Ni alloy, whereas the as-spun alloys substituted by La display a nanocrystalline and amorphous structure, confirming that the substitution of La for Mg notably intensifies the amorphous forming ability of the Mg2Ni-type alloy. For La content x≤0.2, the substitution of La for Mg brings to the formation of LaMg3 and La2Mg17 phases without changing the Mg2Ni major phase. But as La content is increased to x≥0.4, such substitution changes the major phase of the alloys to (La, Mg)Ni3+LaMg3. The discharge capacity of the as-cast alloys grows with the increasing amount of La substitution, whereas that of the as-spun alloys yields a maximum value with variation of La content. Furthermore, the substitution of La for Mg remarkably enhances the cycle stability of the as-cast and spun alloys. And the high rate dischargeability (HRD) of the as-cast and spun alloys first mounts up then falls with rising La content.
Preparation of Layered K4Nb6O17 and its Photocatalytic Activity for Hydrogen Production
Authors: Cui Wen Quan , Liu Yan Fei , Hu Jin Shan , Liang Ying Hua
Published: December 2011

The K4Nb6O17 powders were synthesized via a high temperature solid phase reaction and the effects of calcination temperature and calcination time were investigated. The powers were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and ultraviolet-visible diffuse reflection spectra (UV-VIS). The photocatalytic properties of these catalysts for hydrogen production were also investigated in the presence of Na2S and Na2SO3 sacrificial reagents. The results revealed that the optimal synthesis condition is calcination for 2h under 1000°C. Grain-like particles could be obtained with a rapid temperature rising rate, while rod-like particles were obtained with a slow rate. The K4Nb6O17 sample exhibited high activities for photocatalytic hydrogen production under UV light, and the highest activity of 95.4 mmol/(g cat) was achieved over the sample which at 1000°C for 2h with the temperature rising rate of 20°C/min.
Effect of Negative Poisson's Ratios of Auxetic UHMWPE on the Contact Mechanics in Artificial Hip Joint Replacement
Authors: Xie Fang , Liu Zuo Min
Published: December 2011

With the development of functional and structural materials, increasing interests have been shown in the field of biomaterials with a negative Poisson’s ratio (auxetic), which exhibit the unusual property of becoming thinner when compressed. This unusual property makes it potentially a synthetic replacement biomaterial with adequate mechanical property and wear resistance. In this study, the potential of applying the auxetic ultra-high molecular weight polyethylene (UHMWPE) for the artificial hip joint was discussed. The contact mechanics characteristics in artificial hip joint replacement under different Poisson's ratios of -1<μ≤0.5 were investigated and compared using the finite element method. The results show that Poisson’s ratio had great effect on the contact mechanics in artificial hip joint replacement. Therefore, the future work should focus on tailoring an auxetic UHMWPE with a suitable Poisson’s ratio for artificial hip joint replacements.
Effect of Thermocycling on the Properties of Goat Skin Leather
Authors: Zheng Xue Jing , Huo Shu Hao , Liu Jie , Wang Kun , Tang Ke Yong
Published: December 2011

The pickled goat skins were crosslinked by chromium, aluminum, wattle extract and chestnut extract, respectively. The samples were thermal treated in a container held at different temperature for 5 h for different cycles. The xerothermic stability, water vapor permeability and dimensional stability of the samples were characterized before and after thermal treatment. The effect of thermocycling on the properties of tanned samples was discussed. It was found that the thermocycling at moderate temperature (50 °C) exerted little influence on the xerothermic shrinkage temperature (Txs) of the tanned collagen fibers. The treatment at higher upper limit temperature (100 °C and 150 °C) decreases the Txs and results in an impaired thermal stability. The water vapor transmission rate was decreased after the thermal treatment, likely due to the reduction of the amount of hydrophilic groups of collagen macromolecules as well as the decrease of the pore ratio of leather. Treatment at high temperature damaged the dimensional stability of the specimens.
Synthesis and Luminescence Properties of Tb3+-Doped Hydroxyapatites
Authors: Huang Su Ping , Zhu Jun , Zhou Ke Chao
Published: December 2011

In this paper, the terbium -doped nano-HA powders with strong fluorescence was prepared by hydrothermal synthesis and its crystal structure，morphology and fluorescent properties are characterized by XRD, TEM, XPS, ICP and PL spectroscopy. Results showed that with the doping concentration of Tb3+increasing, the aspect ratio of Tb3+-doped HA particles decreased, while the fluorescence intensity excited by ultraviolet ray at 272 nm is significantly enhanced. With pH values increased from 6.5 to 10.0, the aspect ratio of Tb3+-doped HA decreased greatly, and the morphology of nano-Tb:HA particles changes from rod particles to equiaxed particles and the actual doping content and the fluorescence intensity tends to increase correspondingly, which can be explained that under alkaline solution, Tb3+was more easier entering the HA crystal, and the Tb3+would substitute the Ca2+ in both hydroxyapatite Ca(Ⅰ) and Ca(Ⅱ) site, which may block the active growth sites of the seed crystals and resulted in the growth rate and the ratio of length to radius decreasing.
Development and Application on Simulation System of Plate Rolling
Authors: Duan Li Wei , Chen Lian Sheng , Tian Ya Qiang , Wei Ying Li , Lei Xue Dong , Wang Yue Hua
Published: December 2011

It commences that optimize and design the billet of the medium slab, analyzes various factors that influence plate yield, and proposes the method of the reasonable billet design. Then it anticipates each shift team production plans according to each reasonable combination of the different billet. It is based on the spot production experience of plate, and guarantees the safety of equipments, with attainment of high yield, to optimize design of plate deformation. It imitates calculation the microstructure organization of the medium plate after rolling and cooling by means of researching on the rule of austenite recrystallization. The calculation of the rolling power adopts to consider the variety of the recrystallization in austenite the correction function, improve the accuracy forecast of power and energy. The simulation and calculated results will be showed by means of tabular form or graphic formats.
A Study on Forming Process of Chips during Cutting Cast Iron
Authors: Huang Xiao Bin , Chang Xing
Published: December 2011

In the present paper, the effects of the hardness, strength, chemical composition, microstructure, fracture properties of the material and other factors on the chips formation and deformation were studied during cutting the brittle metal. The process of cutting the brittle metal and the basic theory of the scrap fracture was also discussed comprehensively. In addition, this study pointed out the importance of the hot working process to avoid some metallographic organizations within the cast iron such as the stripy-like and inhomogeneous graphite.
Effect of Controlled Rolling on Mechanical Property and Microstructure of Nb Microalloyed H Beam
Authors: Zhu Min , Ren An Chao , Ji Yu
Published: December 2011

Precipitated phase of microalloyed H beam was analysed by TEM and electrolyzation. Effect of heating temperature on austenite grain size and solid solution of Nb in steel and effect of finishing rolling temperature on property of tested steel were studied. According to the results, controlled rolling process was determined to produce the hot-rolled. Property of H beam includes that yield strength is 410MPa~430MPa, and charpy impact energy at -20°C is greater than 50J. The ferrite grain size number is 11. All of the properties are up to the American Petroleum Institute standard of H beam for offshore platforms.
Control of Pressure Fluctuations in Foamed Sheet Die’s Entrance
Authors: Chen Zai Liang , Zhang Xin , Wang Fei
Published: December 2011

The structure and work characteristics of the extruder cause the pressure fluctuations at foamed sheet die’s entrance, which at exit seriously affect the quality of sheet planet. In view of this, it is very important to stabilize the pressure at the entrance, but pressure fluctuations arising from complex factors are difficult to solve one by one. After the realization of impact at foamed sheet die’s entrance causing by the pressure fluctuations, a device buffering the pressure fluctuations is designed and CFD software FLUENT is used to analysis of its effect.
The Effect of Mechanical Properties of 2.0% Vanadium Ductile Iron after Double Quenching Method
Authors: Idham M. F. , Abdullah B. , Jaffar A. , Ibrahim M. H. , Ramli A.
Published: December 2011

This study presents the effect of hardness and impact of 2.0% vanadium ductile iron after double quenching heat treatment method on different temperature. Addition of 2.0% Vanadium to ductile iron was produced through conventional CO2 sand casting method. The specimens were preheated to 500°C for 30 minutes, then oil quenched and austenitized at 900°C for 60 minutes before oil quenched again. After that, the specimens were tempered for 90 minutes at three different temperatures including (i) 500°C, (ii) 600°C, and (iii) 700°C respectively before cooled to room temperature by nature air. It is evident found that the addition of 2% Vanadium contributed to the slightly improved to the tensile strength properties but better hardness and impact compared to conventional ductile iron. The higher hardness and impact were found at 500°C and 600°C tempering temperature respectively.
Numerical Simulation of Welding for Box Beam Structure on Bogie of High Speed Train
Authors: Liu Huan Jun , Liu Jian Xin , Chen Hui , Ji Hua , Zhang Zhi Yi
Published: December 2011

In this paper a typical box beam structure on certain high speed power car was taken as study object, Based on the finite element analysis software SYSWELD, established the material parameters database for SMA490BW weathering steel, and performed the numerical simulation for the welding of typical box beam structure of side beam of high speed bogie, comparison between the simulation results and that of experiment test verified the existing welding procedures. For the purpose of studying the influence of welding sequence on the residual stress and providing theoretical support for actual production, the residual stress under different welding sequences was investigated then.
A Pseudo Inverse Approach with Kinematically Admissible Intermediate Configurations for the Axi-Symmetrical Cold Forging Modelling
Authors: Halouani Ali , Li Yu Ming , Abbès Boussad , Guo Ying Qiao
Published: December 2011

A simplified method called “Pseudo Inverse Approach” (PIA) has been developed for the axi-symmetrical cold forging modeling in this paper. The traditional “Inverse Approach” (IA) based on the assumptions of the proportional loading and simplified tool actions may quickly give a fairly good strain distribution, but poor stress estimation. Meanwhile the PIA proposed in this paper not only keeps the advantages of the Inverse Approach but also gives good stress estimation by taking into account the loading history. To fulfill this aim, some kinematically admissible intermediate configurations represented by the free surface are used to consider the deformation paths without classical contact treatment. A new direct algorithm of plasticity integration has been used by using the notion of equivalent stress and the tensile curve, leading to a very fast and robust plastic integration procedure. An axi-symmetrical forging has been taken as an example to validate the PIA.
The Effects of Mn Addition on Microstructure and Properties in 6061 Aluminium Alloy
Authors: Wang You Bin , Zeng Jian Min
Published: December 2011

The effects of Mn addition on the microstructure and hardness of 6061 aluminum alloy were studied by means of scanning electron microscope (SEM) , energy dispersive X-Ray Analysis (EDX), X-ray diffraction (XRD) and hardness tester in this work. The results shows that rod and fishbone AlSiFeMn phase will be formed in the alloy with Mn addition in 6061 aluminium alloy, and the AlSiFeMn phase increases with the increasing of Mn content . By the mean of XRD, the Al4.07 Mn Si0.74 phase is found in the 6061 aluminium alloy from 0.7% to 1.5% Mn. The hardness increases with the increasing of Mn contents both for as-cast and for T6 heat treatment. However, the hardness growth rate for as-cast is much more than that for T6 heat treatment at the same Mn addition in the 6061 alloy. Mn has a little effect on the hardness for T6 heat treatment in 6061 alloy.
The Simulation of the Influence of Honed Edge Radius on the Maximum Temperature in Drilling 42CrMo with K-Grade Carbide Drill Bit
Authors: Zhou Yi Dan , Wang Tao
Published: December 2011

This paper uses a metal cutting simulation software AdvantEdge FEM as the platform, and simulates the drilling process of 42CrMo with three different honed cutting edge K-Grade carbide drills. The aim is to study the influence of different magnitude of honed cutting edge on the maximum temperature of cutting area. According to the simulation, the maximum temperature does not absolutely increase with the honed edge radius increase. The cutting temperature reaches maximum when the honed edge radius is 0.06mm in this paper, meanwhile the margin of fluctuation in the smallest.
The Effect of Active Packaging Film on the Quality of Dashehari Mango Fruits
Authors: Xu Wen Cai , Li Dong Li , Fu Ya Bo , Wang Ya Jun
Published: December 2011

This paper describes method for extending shelf time of Dashehari mango fruit using a active packaging film (APF) which can release SO2fungicide. Mango fruits were assessed for weight loss (water loss), firmness, percent of decay, total soluble solids (TSS) over a storage period of 21 days at room condition. APF was efficient to reduce the decreasing firmness and TSS, maintain water of whole mango with any decay during 21days of storage
Effects of Electric Pulse on Solidification Process of Fe-C-S Alloy Treated with RE
Authors: Wang Hai Chuan , Li Xin , Liao Zhi You , Li Ming , Qian Zhang Xiu , Li Jie , Wang Gui
Published: December 2011

The experiment has studied the effect of solidification process of Fe-C-S alloy treated RE on the distribution of elements and inclusions on the distribution of elements and inclusions after the electric pulse field is applied. The results show that Rare Earth in the molten steel has played a purification role and change the strip MnS inclusions into spherical sulfide inclusions. Meanwhile, the co-action of electric pulse field and Rare Earth can reduce and refine inclusions and improve the distribution of elements in solidification microstructure.
Effect of Brazing Clearance on Microstructure and Strength of Welded Joint of 316L Stainless Steel
Authors: Chen Zhuo Jun , Wang Ming , Feng Long Long
Published: December 2011

To study the effect of brazing clearance and temperature on strength and microstructure, vacuum brazing of 316L stainless steel was carried out with BNi-2 nickel-based solder. Choose the different brazing clearance to be processed at 1070°C, analyzed the welding tissue by SEM and XRD, and found that hardness has been greatly improved to 664HV. The results showed that when the 316L stainless steel was brazed with BNi-2 filler metal at 1070°C, the structures of the welded joint were composed of FeNi3, Fe5C2, Cr5FeB3 metallic compounds and solid solutions. The microhardness of the welded joint by the center to both sides had a W-type distribution. When the width of the welded joint was 40μm, the microharedness of the center welded joint was lower than others, and shear strength of this clearance was the highest, about 300MPa.
Structure and Corrosion Resistance of Iron Coatings Containing Silicon Powders
Authors: Wang Yi , Chen Gang , Liu Wei Dong , Zhou Qiong Yu , Zhong Qing Dong
Published: December 2011

Fe + Si coatings were prepared by iron deposition from a bath containing a suspension of silicon powders. These coatings were obtained at galvanostatic conditions, at the current density of jdep=−0.020 A cm−2 and at the temperature of 338 K. For determination of the influence of phase composition and surface morphology of these coatings on changes in the corrosion resistance, these coatings were modified in an argon atmosphere by thermal treatment at 873 K for 2h. A scanning electron microscope was used for surface morphology characterization of the coatings. The chemical composition of the coatings was determined by EDS and phase composition investigations were conducted by X-ray diffraction. It was found that the as-deposited coatings consist of a two-phase structure, i.e., iron and silicon. The phase composition for the Fe + Si coatings after thermal treatment is markedly different. The main peaks corresponding to Fe and Si coexist with the new phases: FeSi. Electrochemical corrosion resistance investigations were carried out in 3.5wt% NaCl, using potentiodynamic and electrochemical impedance spectroscopy (EIS) methods. On the basis of these investigations it was found that the Fe + Si coatings after thermal treatment are more corrosion resistant in 3.5wt% NaCl solution than the as-deposited coatings. The reasons for this are a reduction in the amount of free iron and silicon, the presence of new phases (in particular silicides), and a decrease of the active surface area of the coatings after thermal treatment.
Adhesive Bonding of Glass Fiber Reinforced Polypropylene
Authors: Zhang Jian Guang , He Xiao Dong
Published: December 2011

Joining behavior of long glass fiber reinforced polypropylene (LFT) by three types of adhesive was investigated. Single-lap shear testing was used to evaluate the performance of adhesively bonded structures. The two-part acrylic adhesive DP8005 was determined to be the best among the three adhesive candidates, which was attributed to its low surface energy. The stress distribution in the adhesive layer of the single lap joint was modeled by static elastic analysis using ANSYS software. The shear and peel stresses peaked at the edges of the adhesive layer.
Synthesis and Tribological Properties of MoSe2/C and MoSe2 Nanoflakes
Authors: Li Wen Jing , Li Chang Sheng , Wu Kong Qiang
Published: December 2011

The inorganic materials（MoSe2/C) and MoSe2 were synthesized via solid-state reaction methods and characterized by a series of techniques. The growth process of the products was discussed on the basis of the experimental facts. The tribological properties of MoSe2/C and MoSe2as additives in 150bn basic oil were investigated by UMT-2 multispecimen tribotester. Under the determinate conditions, the friction coefficient of the basic oil containing MoSe2/C (or MoSe2) was lower than that of the basic oil. Moreover, the tribological property of the basic oil with the MoSe2/C was better than that with MoSe2nanoflakes. A combination of sliding friction, stable tribofilm and fill in-repair mechanisms on the rubbing surface could explain the good friction and wear properties of MoSe2/C and MoSe2as additives.
Influence of Allotriomorphic Ferrite under Different Growth Modes on the Variant Selection of Bainite in a Low Carbon Steel
Authors: Guo Hui , Bai Yin , Deng Yun , Yang Shan Wu , He Xin Lai
Published: December 2011

A Fe-0.05C-2.94Mn-1.87Si steel is heat treated using a two-stage isothermal holding process to obtain allotriomorphic ferrite and bainite. Two kinds of allotriomorphic ferrite are obtained, one with only carbon partitioning and the other, alloying element partitioning. It is observed that the allotriomorphic ferrite stimulates the adjacent bainite to select the similar variant on the side where near K-S relationship is maintained between ferrite and prior austenite. The longer the border length of the allotriomorphic ferrite, the larger the stimulated bainite area. The statistical measurement shows that the alltriomorhpic ferrite with alloying element partitioning stimulates such bainite variant selection as well as that with only carbon partitioning.
Single Layer Brushite Coating onto Stainless Steel Substrate Using Dip-Coating Technique
Authors: Amiruddin Ahmad Mulia Hafizayatullah , Shamsudin Roslinda , Jalar Azman , Hamid Muhammad Azmi Abdul
Published: December 2011

In this study, brushite (CaHPO4·2H2O) has been coated on a stainless steel substrate using dip-coating technique. This technique offers uniform and crack-free film over entire surface of the substrate and easy to perform. Layer of brushite coated surround the stainless steel is very much affected by the parameters used namely concentration of the coating solution, speed of coating, stirring time etc. Results show that a smooth thin film is obtained when 1.5M of brushite solution is used and stirred at 50 °C for 2 hours. The optimum withdrawal rate used was 1.5 mm s-1. Thickness of the coating obtained was around 51.37 µm which would enable the apatite to growth.
Effect of Pack Al Content on Growth Kinetics at 650 °C of Ni2Al3 Coating Layer on Nickel-Electroplated Creep Resistant Ferritic Steels
Authors: Wu D.J. , Hua W.H. , Xiang Z.D. , Zhu C.Y.
Published: December 2011

The hybrid Ni2Al3/Ni coating was formed on creep resistant ferritic steels by firstly nickel electroplating and then partially aluminising the Ni layer at 650 °C by pack cementation process using powder mixtures of Al, AlCl3and Al2O3. The effect of pack Al content (W) on growth kinetics of the outer Ni2Al3layer of the coating was investigated by varying it from 2 to 10 wt% whilst keeping the pack AlCl3content constant at 2 wt% and aluminising conditions at 650°C/4h. It was revealed that, once W was above a minimum level, the growth of the outer Ni2Al3layer thickness depended linearly on W1/2. The possible reasons for such growth kinetics were discussed.
Electrodeposition and Hardness and Corrosion Resistance Propertie of Ni/Nano-B4C Composite Coatings
Authors: Jiang Ji Bo , Liu Wei Dong , Zhang Lei , Zhong Qing Dong , Wang Yi , Zhou Qiong Yu
Published: December 2011

Ni–B4C composite coatings on carbon steel substrates with various contents of B4C nano-particulates were prepared by electrodeposition in Ni plating bath containing B4C nano-particulates. Microhardness, Scanning Electron Microscopy (SEM), Tafel polarization and Electrochemical Impedance Spectroscopy (EIS) measurements were used to compare pure nickel coatings and Ni–B4C composite coatings. Pure Ni coating microhardness is lower than that of Ni–B4C coatings and the microhardness of the composite coatings increases with the increase of the content of B4C nano-particulates. The effects of various contents of B4C nano-particulates on the corrosion resistance were investigated and it was found that the best anti–corrosion property of Ni–B4C composite coatings is at 6 g/L B4C in the bath formulation.
Researches on the Behavior of Carbon and Sulfur Segregations of 82B Billet
Authors: Tang Hai Yan , Wang Hong Bin , Li Hai Shun , Li Jing She , Wang Qing Guo
Published: December 2011

The behavior of carbon and sulfur segregations of 82B hard wire steel produced under different continuous casting conditions has been systematically studied by the combination of field trial and laboratory analysis. The results showed three factors such as superheat degree, casting speed and F-EMS which influenced the segregation of billet worked differently with the variations of inner positions of the billet and segregation elements. For the central segregations of carbon and sulfur, the dominant factor was casting speed. Under high casting speed, proper increase of secondary cooling intensity could effectively decrease carbon and sulfur segregations of billet, especially for the central position of billet. The hydraulic simulation of the tundish showed the optimal casting speed should be 1.8m/min.
Tribological Properties of NiCr-Cr3C2 - Ni / MoS2 Supersonic Plasma Sprayed Coating under Different Temperatures
Authors: Li Xu Qiang , Wang Hai Jun , Guo Yong Ming , Liu Ming , Zhao Ke Ke
Published: December 2011

NiCr-Cr3C2-Ni/MoS2composite coating was prepared by supersonic plasma spraying (S-PS) process. The tribological properties of the composite coating at 25°C, 300°C, 500°Cand 750°C were studied. The wear mechanism for the coating was discussed considering the microstructures, compositions and mechanical properties of the composite materials. Results show that the coating exhibits good tribological properties at 750°C, which was attributed to the compact and continuous Cr3O2transfer film formed on the friction surface. The wear rate of the coating increases with the temperature increase, which was associated with the decrease of the mechanical strength and stress-resistance of the coatings.
Synthesis, Characterization and Corrosion Protection Properties of Polyaniline/TiO2 Nanocomposite
Authors: Zhong Lian , Wang Yan Hua , Lu Yong Hong
Published: December 2011

In this study, conductive polyaniline (PANi)–titania (TiO2) nanocomposites with core–shell structure were prepared and their anticorrosion properties were investigated. PANi/nano-TiO2 composite were prepared by in situ polymerization of aniline monomer in the presence of TiO2 nanoparticles. The morphology and structure of the polymer nanocomposite was characterized by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR), respectively. SEM and FTIR spectra measurements show that PANi and TiO2 nanoparticles are not simply blended or mixed up, and a strong interaction exists at the interface of nano-TiO2 and PANi. From the anticorrosion investigation in 3.5%NaCl, it is revealed that the protective performance of epoxy paint containing PANi/nano-TiO2 composite is significantly improved than PANi or a mixture of polyaniline and nano-TiO2. From the improved anticorrosion performance, it also indicate that PANi and TiO2 nanoparticles are not simply blended or mixed up, the strong interaction exists at the interface of PANi and nano-TiO2. It is the strong interaction that results in the coordinated effect and more excellent anticorrosion performance.
Preparation of Activated Carbon from Medical Waste
Authors: Sun Xiu Yun , Bian Hong Xia , Zhang Meng , Han Wei Qing , Shen Jin You , Li Jian Sheng , Wang Lian Jun
Published: December 2011

The chemically activated method has been applied to prepare activated carbon from the incinerated medical waste. The preparation process of activated carbon was investigated under various conditions set by several factors, including the type of active agent used, the ratio of active agent and carbonized product, the activation temperature, the dwell time and heating rate. The results demonstrated KOH had shown the best performance as the active agent. The optimal preparation conditions could be described as follows: ratio of KOH and carbonized product 3:1, heating rate 5 °C/min, activation temperature 800 °C with activation time 1 hour. The activated carbon prepared under the optimal preparation conditions showed good adsorption performance. The adsorption capacities for methylene blue and iodine were 24~28 ml/0.1g and 965~1150 mg/g, respectively. BET surface area of activated carbon obtained was as high as 985.1634~1387.4586 m2/g. The activated carbon prepared from medical waste exhibited excellent characteristics of sorbent.
The Cycle Measurement of Sulfur Blank Value with the CS-444 Infrared Ray Carbon Sulfur Analyzer
Authors: Wei Jian Huan , Sun Hua Feng , Yang Sheng Jie
Published: December 2011

After the CS-444 infrared ray carbon sulfur analyzer reducing and stabilizing the blank value, we use it for the initial measurement and second measurement, and the third measurement if necessary, we can get the blank value of the sulfur. The results show that the precision and accuracy are better.
Study on Surface Stress Measurement of Laser Cladding Fe-Based Alloy Coating Based on Rayleigh Wave Signal Analysis
Authors: Liu Bin , Dong Shi Yun , Xu Bin Shi , He Peng
Published: December 2011

Experimental study on surface stress measurement of laser cladding Fe-based alloy coating based on Rayleigh wave acoustoelastic theory was introduced. Two Rayleigh wave transducers with 5MHz frequency, the distance between which was fixed, were employed to measure the difference in time of flight along the surface of laser cladding Fe-based alloy coating. Rayleigh wave signal responding to different tensile stress was collected and the difference in time of flight between unstressed and each stressed Rayleigh wave signal was calculated with normalized cross correlation function. Results show that the propagation velocity of Rayleigh wave linearly increases with tensile stress increasing, and the maximum difference in time of flight is obtained at tensile stress level of 492MPa, while the relation between tensile stress and the difference in time of flight is obscure with tensile stress further increasing. Furthermore, the thickness of laser cladding Fe-based alloy coating and the deformation of coating surface may result in errors in experiment. Finally the surface stress of laser cladding Fe-based alloy coating is evaluated by Rayleigh wave acoustoelastic technique and the experimental result is well compared with the theoretical value.
The Tribological Behaviour of Beryllium Copper Alloy QBe2 against 30CrMnSiA Steel under Sliding Condition
Authors: Tan Zhi Hai , Guo Qiang , Li Xia , Zhao Zheng Ping
Published: December 2011

The tribological behaviour of beryllium copper alloy QBe2 against 30CrMnSiA steel under sliding condition were tested at the M2000A model wear tester. It studied the hardness, surface roughness, load and prior corrosion of QBe2 specimens under the dry or grease lubricated conditions. The volume wear and friction coefficient were relatively better when the hardness of QBe2 was lager under the grease lubricated sliding friction. The volume wear was the smallest when surface roughness was 0.8μm, and its tribological properties were the best under the grease lubricated sliding friction. Meanwhile the values of wear loss, wear rate and average friction coefficient under the grease lubricated friction were one level smaller than that under the dry friction. The volume wear and friction coefficient decreased with the loads declined under the grease lubrication condition. Prior corrosion process made the lubricant effect worse, which obviously reduced the wear-resisting property of QBe2 and enlarged its wear rate and friction coefficient.
Influence of Solution Temperature and Time on Microstructure and Properties of A357 Alloy
Authors: Li Yang , Cheng Hai Feng , Zeng Jian Min , Zheng Yu Lin
Published: December 2011

Metallographic analysis, hardness testing and diffusion kinetics analysis were used to investigate the influences of temperature and time on morphology of eutectic Si and properties of A357 alloy under the solution heat treatment, and optimal solution parameters were determined. The results indicate that solution heat temperature strongly influences the morphology of eutectic Si and mechanical properties of the A357 casting alloys. Spheroidization degree of eutectic Si decreases and the mechanical properties of A357 alloy with the increasing of solution temperature. According to the experiment results, optimal solution parameters of A357 alloy were determined as 550°C×6h.