bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Fibrillated Nanofibers and Application of High Efficiency Filter Material
Authors: Tian Yu , Liang Yun , Cui Yan , Zhang Zeng
Published: September 2011

Abstract. The nanofiber based filtering material, made up of fibers of diameter less than 1000 nm, have been discovered as new filtering material for effective filtrations. Lyocell fiber is a kind of regenerated fiber which can be easily fibrillated and brought no negative impact on the recovery of filter material.The present study focuses on how the Lyocell fiber changes with the intensity of beating and compares the effect of nano-fibrillated Lyocell fiber（61°SR） and micro glass fiber（44°SR） on the properties of filter material. The results show that the length, diameter, distortion and degree of fibrillation of Lyocell fiber changes obviously by beating, and a mass of nano-fibril appeared after intensive beating. At the same time, the air permeability and pore size distribution is similar when the content of fibrillated Lyocell fiber and micro glass fiber are the same in filter material; What’s more, the strength of filter material increases with the percentage of fibrillated Lyocell fiber increasing, But the micro glass gets an opposite trend. The burst strength of the filter material with 20 wt.% fibrillated Lyocell fiber is 336KPa, with 20 wt.% micro glass fiber is 71KPa.This study has shed some light on the application of Lyocell fiber to improve the accuracy of filter material effectively.
Research on the Process of a Green Method for Preparing the Alumina Nanofibre
Authors: Li Lei , Kang Wei Min , Cheng Bo Wen
Published: September 2011

In this paper, using the wasted beverage cans, the alumina nanofibre was fabricated via electrospinning method. The effects of various processing variables on the morphology of electrospun nanofibres were discussed, such as solution concentration, spinning voltage strength and deposition distance. The results showed that the proper solution could be obtained after the surface of the beverage cans were treated. When the PVP concentration was 6%, spinning voltage was 30kv and the deposition distance was 13cm, the alumina nanofibre with uniform diameter, excellent structure and good morphological feature could be obtained.
Trial Research on the Engineering Properties of the Roaming Polyurethane
Authors: Wu Wei , Zhang Chao , Chen Rong Jun
Published: September 2011

With fixing proportion of two components of RPUF and changing content of different admixtures, this paper does experiments on material density, compressive strength and so on to research the influence of different content of admixtures on the engineering properties of RPUF and analyze the relationship between physical properties and mechanical properties of the materials.
Hydrothermal Synthesis and Photocatalytic Properties of Flower-Like CdS Nanostructures
Authors: Wang Hong Mei , Zhou Da Peng , Lian Yuan , Pang Ming , Liu Dan
Published: September 2011

Hexagonal flower-like CdS nanostructures were successfully synthesized through a facile hydrothermal method with thiourea as sulfur source. By combining the results of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), the structural and morphological characterizations of the products were performed. The photocatalytic activity of CdS nanostructures had been tested by degradation of Rhodamine B (RB) under UV light compared to commercial CdS powders, which indicated that the as-syntherized CdS nanostructures exhibited enhanced photocatalytic activity for degradation of RB. The possible growth mechanism of CdS nanostructures was proposed in the end.
Influences of Additive Si on the Synthesis of Diamonds Using Fe Power as Catalyst
Authors: Zheng You Jin , Huang Hai Liang , Jia Xiao Peng , Ma Hong An
Published: September 2011

In this paper, industrial diamonds using pure Fe powder catalyst with additive Si has been synthesized by HPHT method. Optical microscope, XRD and SEM were utilized for observation and detection. The influences of additive Si on the synthesis have been investigated from several aspects such as the diamond-forming conditions, the composition of synthesized sample and inclusions in diamond, and the morphology character of diamonds etc. The results indicate that the formation of SiC, which should have been in a solid state during the synthesis.
The Controllable Flexible Features of ZnO Thin Film Gas Sensor
Authors: Cao Xin Liang
Published: September 2011

For different gas sensing, the preparation of Zinc Oxide (ZnO) thin film gas sensor has its particularity. In this paper, three kinds of preparation methods, fitting for CO and methane and CO2 sensing, are introduced. Moreover, the sensitivity is respectively analyzed as gas sensors. The reference is provided for the preparation and applications of ZnO thin film gas sensor.
Tribological Property of Nano-Cu as Additive in Lubricating Oil
Authors: Wang Shun Xing , Gao Xu Rui
Published: September 2011

The tribological property of nano-Cu as additive in lubricating oil was investigated on a stock-on-ring testing machine. Friction coefficient and wear mass loss were discussed in order to study tribological property. And the worn surfaces were characterized by scanning electronic microscopy(SEM). Then wear and lubricating mechanism were discussed. The results show that the wear and friction properties of nano-Cu as lubricating oil additive are excellent. And when the adding quantity is 0.04% and 0.03%(mass fraction), the friction coefficient and wear mass loss is best, respectively.
A Multi-Function Agent Used in Drilling Fluid and Completion Fluid MFA-1
Authors: Wang Ping Quan , Yu Zong Xue , Yin Da , Liang Hong Jun , Yang Kun Bin
Published: September 2011

In order to take exploratory well, production well ( development well), and reservoir p-retection into account. Multi-functional treatment agent used in drilling fluid and completion flui-d which called MFA-1 has been successfully developed by the equilibrium principle of dispersion and accumulation. The result shows that MFA-1 is fluorescenceless and low (no)toxicity. Also, it has many perfect properties such as filtration reducing, lubrication, anti-collapsing, plugging, re-servoir protection, strong anti-temperature (＞150°C) ,strong anti-salt,ect. Its whole effect is bett-er than sulphonating asphalts HL-Ⅱ and SAS.So MFA-1 is a good succedaneum of sulphonating asphalts.In more than 20 wells of Tarim Oilfield,drilling fluid and completion fluid which prepared with MFA-1 has been successfully used to solve many problems. Such as drill pipe sticking w-hile testing and the underground complex incidents,ect. As a result,it takes good social benefits a-nd good economic benefits.
First Principles Study on Shear Deformation of TIN/BN/TIN Interface
Authors: Gao Wei , Xie Fei , Jia Ke Jun
Published: September 2011

To obtain a view of the shear deformation mechanism, ideal shear strength and hardness in superhard nanocomposites nc-TiN/a-BN films, we studied, using the first-principles calculation method, the shear stress-strain response of a theoretical interfacial system TiN/BN/TiN, which consists of two TiN slabs and one sandwiched BN monolayer. The shear process showed that decohesion happens at the Ti-N interplanar bonds next to the interface. The calculated results show that the TiN/BN/TiN interface has the hardness that can match the TiN/SiN/TiN syatem.
Geometrically Nonlinear Analysis of Cross-Ply Laminated Composite Beams Subjected to Uniform Temperature Rise
Authors: Chang Xue Ping , Zhang Xiao Dong , Liu Qing You
Published: September 2011

Abstract: On the basis of Reddy’s higher order shear deformation plate theory and the von Kármán’s geometry nonlinear theory, governing equations for nonlinear thermal buckling and post-buckling of cross-ply laminated composite beam subjected to a temperature rise are derived, in which the stretching-bending coupling terms produced by the non-homogenous distribution of the material properties are included. By using the shooting method to solve the corresponding nonlinear boundary value problem, numerical solutions for thermal post-buckling of cross-ply shear deformation laminated composite beam with its both ends immovably simply supported under uniform temperature rise are obtained. As an example, equilibrium paths and configurations for laminated composite beam paved in term of 0/90/0 are presented and characteristic curves of the nonlinear deformation changing with the thermal load were plotted. The effects of the geometric and physical parameters on the deformation of the beam are also examined. The theoretical analysis and numerical results show that different thermal expansion coefficient ratio, elastic moduli ratio, shear stiffness ratio will influence of the non-dimension critical buckling temperature.
Soft Modeling of Wire Electrical Discharge Machining of WC-Co Composite
Authors: Muthuraman Veluswamy , Ramakrishnan Raju
Published: September 2011

The prediction of optimal machining conditions for required surface roughness and material removal rate (MRR) plays a very significant role in process planning of wire electrical discharge machining (WEDM). Artificial neural networks (ANN) are widely applied to predict the performance characteristics of complex machining process like WEDM very accurately. This present work deals with the features of cutting operation by WEDM of tungsten carbide- cobalt composite(WC – Co) and an artificial neural networks(ANN) model in terms of machining parameters, developed to predict surface roughness(Ra) and material removal rate (MRR).The experiment was planned as per Taguchi’s L 27 orthogonal array. The predictive capacity of the models was validated. The test results indicate that the proposed models could adequately describe the performance indicators with the limits of the factors that are being investigated. Finally the accuracy of the developed ANN model was compared to the experimental values. It was observed that the proposed ANN model is good.
Fold-Resistant Characteristics of the Laminate Composites for Flexible Structure
Authors: Liu Yu Xi , Liu Yu Yan , Wang Chang Guo , Tan Hui Feng
Published: September 2011

There is considerable interest in the use of flexible laminate composite materials to improve the deployable structures for space applications. Critical to acceptance of these materials is the ability to achieve high packaging strains without damage. However, there does exist more or less damage during the process of folding and unfolding for the laminate composites. Better understanding of folding damage, therefore, is needed for the design of laminate composites and folding pattern. In this work we present a study on the fold-resistant characteristics of two different laminate composites, which were fabricated by covering the aramid fiber/epoxy and carbon fiber/epoxy prepregs respectively with polyimide film on both sides. The results of tensile tests on 3-layer structure laminate composites show that the fold-resistant properties of aramid fiber/epoxy composites could be improved with increasing of the resin content and decreasing of the fiber bundle diameter. For carbon fiber/epoxy composites, the effects of resin content and fiber bundle diameter on reduction rate of fracture strength were more complex. There existed a best range of resin content and fiber bundle diameter. The microscopic observations show that folding resulted in piling up of resin and damage of reinforcing fiber, which would decrease the mechanical properties.
Effect of Solid Solution Treatment on Corrosive Action of 00Cr26Ni5Mo2Cu3Re Duplex Stainless Steel in Acid Stage
Authors: Zhao Hong Pu , Wang Shun Xing
Published: September 2011

Effect of solid solution treatment on corrosive behavior of 00Cr26Ni5Mo2Cu3Re Duplex Stainless Steel in static stage of HNO3+HF acid solution is studied in the paper.The results show that the corrosion between phases and pitting corrosion on ferrite are serious at low temperature ,the phenomenon gradually disappear with the solid solution temperature rising ; the corrosive resistance of 00Cr26Ni5Mo2Cu3Re is getting better first and then decrease with solution temperature at high temperature, the best corrosive resistance temperature is at 1050°C.
Microstructure and Mechanical Properties of 45 Steel by Zero Time Holding Quenching
Authors: Chen Xiao Wen , Zhang De Fen , Long Guang Wen , Zou Qin , Wang Li
Published: September 2011

45 steel was quenched with zero time holding at different temperatures, followed by a high temperature tempering. The influence of quenching temperature on hardness, yield strength, tensile strength and microstructure of the steels was investigated by Rockwell tester, universal testing machines and metallographic microscopy, respectively. The results show that under quenching condition of zero time holding, hardness and strength of the 45 steel increase with increasing quenching temperature and reach the maximum at 860 °C, where the content of martensite is maximum while that of ferrite is minimum in the specimen. At higher temperatures, the grains become obviously coarse, resulting in decrease of mechanical properties.
Microstructural Observation of Ni-WC Surface Alloyed Carbon Steel
Authors: Guo Chang Qing , Wang Qi Huan
Published: September 2011

EPS (expanded polystyrene spheres) templates with thickness of a 10 mm coating on a surface that is mainly consisted of Ni-WC particles, are prepared. Carbon steels containing 0.45C%wt are then cast in the templates using V-EPC process (vacuum expandable pattern casting), forming the surface alloyed steels. The microstructures are observed and analyzed using optical microscope, SEM and EDS. Macrostructural observation showed that the surface alloyed zone is dense and there is no obvious defects, such as gas bubbles, occluded gas holes and delimitation. Microstructural investigations indicate that the samples from top to bottom are obviously consisted of three different zones, i.e., the top alloyed zone, the interim transitional zone and the bottom matrix zone. Ni-WC particles are totally decomposed during the molten steel infiltration. The microstructures in the surface alloyed zone are consisted of small amounts of fine WC+W2C carbides, large amounts of M3C+M7C3 carbides and dendritic matrix. There is a fine pearlite strip at the top of the transitional layer. Small amounts of carbide particles within the matrix grains and net carbide precipitation in the grain boundaries at the transitional zone can be observed.
Web Based Dss for Inventory and Scrap Optimization in a Printing & Packaging Industry
Authors: Govindarajalu V. , Senthil Kumar V.S.
Published: September 2011

This paper proposes a genetic algorithm based optimization of the product and scrap inventory levels in a printing and packaging industry so as to minimize total supply chain cost. The scrap optimization procedures are in the primitive level of implementation in the industries. Determining optimal levels of scrap inventory enables the industries to attack the problem of high scrap and high inventory, thus enables the industries to make quick and sound decisions regarding the production of paper boards in a printing and packaging industry.
Study on Kinematics and Simulation of Robotic Arm
Authors: Lei Xiao Long , Ma Rong Chao , Gou Wen
Published: September 2011

In order to improve efficiency and automation of spraying, a automatic spray lance, which was regard as an robotic arm, was studied. It could reach the desired position automatically. A study was carried out using Denavit and Hartenberg (D-H) approach to automate the four Degrees of Freedom (DOF) robotic arm. The kinematics of robotic arm was constructed us D-H coordinate frame model. And the inverse kinematics has been solved with inverse transform technique. Some motion parameters could be acquired. Simulation of the robotic arm was studied using the Robotics Toolbox which is MATLAB software. Simulations’ content included homogeneous, construction of robot object, kinematics and trajectory. The results of simulation indicated that the movement of robotic arm could satisfy the demands of four DOF. The robotic was founded able to move to the desired position by simulating. The links’ motion parameters were reasonable and it provided a new spray lance for automatic sprayer.
Design of a Generic Postprocessor Based on UG
Authors: Li Tie Gang , Liu Dong Mei , Fan Zhi Guang , Fu Chun Lin , Wang Wan Shan
Published: September 2011

With the development of NC machine tool and NC machining, the postprocessor is play a vital role increasingly, which is an interface of operations in CAM and NC machine tools transformed cutter location data into machining control data. The general kinematics model of various machine tools was constructed by analysis of machine tools configuration and NC control systems. The coordinates were of machining files calculated using Coordinate transformation matrix in the process of post-processing. Finally, a postprocessor develop by VC++ and secondary development tool in UG, through the implementation of the postprocessor and the verification with the commercial NC simulation software VERICUT as well as the machining experiment, the effectiveness of the proposed methods were demonstrated.
3-D Stress Analysis of Pneumatic Pen Cylinder with Preload in Mounting Nut
Authors: Jiang Dan , Yang Ping , Ma Ren Tian
Published: September 2011

As a necessary component in pneumatic muscle, minimum switch and minimum mechanical hand, pen cylinder used as prime actuator possesses the characteristics of high speed actuation possible, easy installation, improved wear resistance and so on. The construction and working principle of the pen cylinder are introduced. Using 3-D stress field finite element analysis (FEA) method, the stress field distribution of pen cylinder with preload in mounting nut is analyzed. Simulation results are presented. The stress characteristics are compared between different preload in mounting nut and thickness of mounting bracket.
Size Dependent Pull-in Phenomena in Electro-Statically Actuated Micro-Beam Based on the Modified Couple Stress Theory
Authors: Zhao Jun Feng , Zhou Shen Jie , Wang Bing Lei
Published: September 2011

A modified continuum model of electro-statically actuated micro-beam is presented based on the modified couple stress theory. The new model contains a material length scale parameter and can capture the size effect, unlike the classical Bernoulli-Euler beam theory. The governing equation of the micro-beam is derived based on the Hamilton’s principle, which accounts for the effects of the moderately large deflection, the residual stress and the fringing electrostatic field. The numerical analysis of mechanical characterization is performed by the Analog Equation Method (AEM). The effects of the couple stress on the static and dynamic responses, pull-in voltage and pull-in time are discussed.
The FEM Analysis for Magnesium Alloy Honeycomb Panel
Authors: Gu Xiue , Quan Gao Feng , Ding Zhi Min
Published: September 2011

The numerical modeling and modal analysis had been investigated on vibration of magnesium alloy honeycomb panels. With a simplified model of honeycomb panel, imposing the boundary and initial conditions, the distribution of the natural frequency and inherent vibration mode of the honeycomb sample could be simulated by using Lanczos method, the summit amplitudes and the most dangerous points are found. The effective factors such as materials modulus, the density as well as the assembling all contribute to the analyzed results. The vibration modes and the basic vibration frequencies were analyzed. According to the analysis, the risk-reduction program is proposed.
Influence of Carbon Content on the Microstructure and Precipitates of the V-N Microalloyed Steels
Authors: Ma Jia Yan , Zhang Xian Zhong , Guan Yun , Deng Zhao Jun
Published: September 2011

The microstructure and precipitates of the V-N microalloyed steels whose carbon content were respectively 0.27% and 0.35%, were investigated by scanning electron microscope (SEM) and transmission electron microscope (TEM). It is shown that the microstructures of the test steels are all composed of ferrite and pearlite, the area percent of ferrite decreases from 49% to 40% and the grain size also descends from 8.96μm to 8.61μm with the increase of carbon content. TEM results show that the precipitates in two kinds of steels all include a large amount of 10~20nm dispersion distribution irregular flake VC, the part of fibrous VC that grows toward to intragranular ferrite along the grain boundary in the local area, and only a small amount of spherical VN or V (C, N). When the carbon content increases from 0.27% to 0.35%, the number of the spherical VN or V(C,N) increases obviously and the size of it varies from 20~100nm to 45~105nm, while the number of flake VC and fibrous VC decreases significantly and the length of fibrous VC shortens from several micrometers to nanometer size. Experimental results indicate that most of the spherical VN or V (C, N) firstly appear in austenite, then the flake VN and fibrous VN with precipitation strength effect emerge in ferrite during the following γ→α transformation and cooling process. The increase of carbon content can lead to the increase of driving force that VN or V (C, N) firstly appear in austenite, which results in the significant increase of ferrite nucleation rate and the refinement of microstructure.
Flaky and Porous Rod-Like MgO Powders Prepared by Molten Salt Synthesis
Authors: Sun Jian Qi , Chen Hao , Cao Fei , Hu Qing Hua
Published: September 2011

Flaky and porous rod-like MgO powders were prepared by molten salt synthesis with MgCl2, CaCO3, NaNO3and KNO3as raw materials. TG-DSC, XRD and SEM were used to investigate the reacion process and characterize the resulting products. The results indicated that Ca2+was displaced by Mg2+and dolomites were formed and finally converted into magnesium carbonates during the molten salt synthesis. Fibrous Mg(OH)2formed in PEG solution and flaky Mg(OH)2formed in EDTA-PEG solution illustrated that EDTA and PEG molecules could define the growth direction of Mg(OH)2. The porous rod-like MgO powders with 20-80 nm in diameter and 40-100 in length-to-width ratio were obtained by the decomposition of fibrous Mg(OH)2at 600 °C, while the flaky MgO powders were prepared by the decomposition of flaky Mg(OH)2at 600 °C. Flaky MgO powders were platelike, with 30-50 nm in thickness, 200-500 nm in diameter, and up to 1.0 µm2in a single slice surface area.
The Innovative Design of New-Style Clamping Automobile Tires Conveyance Based on TRIZ
Authors: He Qin , Su Qian , Zhang Ming Qin , Zhang Rui Jun , Qu Sheng
Published: September 2011

Abstract. This part analyzed clamping automobile tires conveyance’s research situation, summarized its failure problem and occurrence cause, and selected the important failure problem by RPN method; and then solved creatively clamping lever roller’s wear, clamping lever’s excessive damage owing to rise and decrease slightly, the automobile conveyance’s excessive damage owing to the car’s rollover and clamping lever’s bearing load unevenly; in the end, proposed the conceptual design of new-style clamping vertically automobile tires conveyance. The conveyance have a simple structure, decrease the clamping lever’s and car tire’s wear, avoid cantilever phenomenon owing to rise and decrease slightly, decrease the clamping lever’s strength and stiffness.
Influence of Nano-ZnO on Crystallization Behavior and Sintering Performance of Fused Quartz Ceramic Materials
Authors: Chen Yue Jun , Wang Zhi Fa , Yu Li Xue , Bu Jing Long , Wang Rong Lin , Wang Rui Sheng
Published: September 2011

Fused quartz granule (d50=0.019 mm) was used as raw material, nano-ZnO (size<0.08 μm) was used as additive with dosages of 1% (in mass, similarly hereinafter), 2% and 3%. Fused quartz ceramic materials were fabricated in reduction atmosphere at 1300 °C, 1350 °C and 1400 °C for 1 h. Properties of samples were researched by measurements of apparent porosity, bending strength and thermal expansion rate, and analyzed by XRD and SEM. The results showed that additive nano-ZnO had excellent inhibiting effect on crystallization of fused quartz sintered at 1300 °C and 1350 °C. As dosages of nano-ZnO increased, thermal expansion rate, diffraction peak intensity and bending strength were improved, and microstructure of the samples became more compact. It can be deduced that for fused quartz ceramic materials, with add dosage of nano-ZnO increasing, the inhibiting effect on crystallization decline, but the facilitating effect on sintering enhance.
Influences of Progressing Parameters on Flake BaBi4Ti4O15 Powder Synthesized by Molten Salt Synthesis Method
Authors: Huang Jin Liang , Li Li Hua , Gu Yong Jun , Li Qian
Published: September 2011

Abstract. BaBi4Ti4O15 powder was synthesized by molten salt synthesis (MSS) method in NaCl-KCl and Na2SO4-K2SO4 fluxes. The phases of reaction products and the microstructures at different calcined temperatures were detected by X-ray diffraction (XRD) and scanning electron microscope (SEM). As a result, the flaky BaBi4Ti4O15 powder with anisotropy was synthesized by molten salt synthesis method in NaCl-KCl and Na2SO4-K2SO4 fluxes in the range of 850～1050°C. Compared with BaBi4Ti4O15 powder synthesized in the sulfate flux, the anisotropy level of BaBi4Ti4O15 powder which was synthesized in chloride flux increased, the average particle size(APS) of BaBi4Ti4O15 powder synthesized in the chloride flux is slight larger than in the sulfate flux. The thickness of BaBi4Ti4O15 powder was synthesized by molten salt synthesis method in the chloride flux decreased than in the sulfate.
Effect of Si3N4-Y2O3 Compound Additive on Crystallization and Sintering of Fused Quartz Ceramic Materials
Authors: Liu Shu Long , Wang Zhi Fa , Bu Jing Long , Shen Shu Bin , Yu Li Xue
Published: September 2011

Fused quartz granules (d50=19 μm) were used as raw material, and Si3N4-Y2O3 (1:1, in mass) was used as additive with dosages of 1%, 2% and 3% (in mass). Fused quartz ceramic materials were fabricated in reduction atmosphere at 1300 °C, 1350 °C and 1400 °C for 1 h. The effect of Si3N4-Y2O3 on crystallization and sintering of the fused quartz ceramic materials were researched by measurements of apparent porosity, bending strength and thermal expansion rate (RT~1200 °C), and by the analyses of XRD and SEM. The results showed that the samples sintered at each temperature with 3% Si3N4-Y2O3 had the lowest apparent porosity, the highest bending strength and more compact microstructure. This indicated that 3% Si3N4-Y2O3 was conducive to sintering of fused quartz ceramic materials. The results of XRD and thermal expansion rate showed that addition of 3% Si3N4-Y2O3 compound had obvious effect on inhibiting crystallization of the samples sintered at various temperatures. It can be deduced that the Si3N4-Y2O3 compound plays the best role in inhibiting crystallization and facilitating sintering of fused quartz ceramic materials.
Research and Application of New Oxygen Lance for BOF Steelmaking
Authors: Rao Jiang Ping , Li Guang Qiang , Yang Zhi Zheng
Published: September 2011

This paper compares the structure and basic points of the new lance with traditional ones, analyses the new design with center hole in head in fields of theoretical supersonic jet characteristics including penetrating depth and stirring energy, operation mode in smelting process and. The application results show its advantages in keeping whole dephosphorizing rate, final carbon-oxygen equilibrium control of steel and cost reducing, on the other hand, point to its several drawbacks. Optimize solutions are introduced at the end.
Effects of Thermomechanical Treatment Process on the Microstructure and Properties of 7A04 Aluminum Alloy
Authors: Zhang Shi Xing , Wu Hai Hong , Cai Gang Yi
Published: September 2011

The mechanical properties of a 7A04 aluminum alloy were improved by deformation strengthening and phase transformations strengthening adopting thermomechanical treatment, whose process include solution treatment, deformation treatment and ageing treatment in turn. The paper focuses on the influences of deforming degree and ageing process on microstructure and properties of 7A04 aluminum alloy. The experimental results show that hardness increased with increasing deformation ratio, and the value are greatly higher than that of samples after solution treatment. The results of ageing after deformation show that the hardness enhanced with prolonging the ageing time, which reach the peak value at 16 hours. In addition, the microstructure became more homogeneous and the grain was refined obviously by metallography microscope observation. The second phase precipitate dispersedly to strengthen the alloy. Above all, in order to obtain the better mechanical properties, the optimal thermomechanical treatment processes are solution treatment at 470°C for 2h, deformation with ratio of 40% as well as ageing at 120°C for 16h.
Effects of Solution and Two-Stage Ageing Treatment Process on Microstructure and Properties of 6061 Aluminum Alloy
Authors: Zhang Shi Xing , Cai Gang Yi , Wu Hai Hong
Published: September 2011

Comprehensive performance of 6061 aluminum alloy was improved by solution treatment and two-step ageing treatment in this paper . The effects of different thermal processing parameters on the microstructure and mechanical properties of 6061 aluminum alloy were studied. The experimental results show that the optimal process of solution treatment for 6061 aluminum alloy is heated at 500°C for 10min. After first-stage aging, the hardness measurements and microstructure analysis results show that the hardness increased with increasing aging temperature, and reached peak value at temperature 180°C for 10h, while in the second-stage ageing treatment, the sample got the ageing peak value at 220°C for 1h. After two-stage treatment, the grains of 6061 aluminum alloy became uniform and fine and the second phase distributed along the grain boundary and play an important role of dispersion strengthening. Above all, the optimal heat treatment process of 6061 aluminum alloy is solution treated at 500°C for 10min, as well as ageing at 180°C, 10h and 220°C, 1h
Key Technology Development Trend for Recycled Aluminum Industry Based on Technology Roadmap
Authors: Yang Zheng Shu , Lv Shao Xun , Cao Peng Chong , Abdullah Muhammad Ibrahim , Liu Wei
Published: September 2011

Recycled aluminum industry has great prospects in china. Early identification of key technologies for recycled aluminum plays a very important role in the healthy development of recycled aluminum industry. This paper studies the key technologies of recycled aluminum by technology roadmap method. Recycled aluminum technologies are evaluated by hierarchical analysis model, which is established by Delphi method, and then the key technologies of recycled aluminum industry are determined. Preliminary results and conclusions from this study point out the direction of technology research and technology upgradation for recycled aluminum industry.
Preparation and Investigation on Properties of Shape Memory Epoxy Modified by Hyperbranched Polyester
Authors: Han Chun Miao , Liu Yu Yan , Tan Hui Feng
Published: September 2011

A series of hyperbranched polyester (HBPE) modified shape memory epoxies (SMEPs) were prepared for the first time. The materials’ toughness, mechanical properties and heat resistance were investigated by impact test, tensile test and DSC analysis. Besides, the possible effect of hyperbranched structure on SMEP’s shape memory property was studied by fold-deploy shape memory test. The results showed 5wt. % HBPE modified SMEP had the optimum properties. Its impact strength, tensile strength and elongation at break were increased by 51.8, 11.4 and 25.4%, respectively, without negative effect on SMEP’s heat resistance and shape memory property. All the samples had high shape retention ratio and 100% shape recovery ratio.
The Analysis of Dynamic Viscoelastic Properties of Regenerated Cellulose at Different Temperature and Humidity
Authors: Yang Ming Shan
Published: September 2011

The effects of temperature and relative humidity on regenerated cellulose had been investigated in detail in the present work. From experimental results, it was shown that with increasing of RH within temperature range of 35~65°C, storage modulus Er decreased, loss tangent tanδ increased. This indicated that water molecules penetrate into cellulose and mask off inter- and intra-chain hydrogen bonds and make some motion units to move. More importantly, experimental results indicated that three regenerated cellulose samples had different microstructure and superstructure, which greatly affects the properties of regenerated cellulose. So it will be very valuable to further study the effect.
Ac Conductivity and Dielectric Properties of Hexanoyl Chitosan-LiClO4-TiO2 Composite Polymer Electrolytes
Authors: Winie Tan , Chan Chin Han , Subban Ri Hanum Yahaya
Published: September 2011

Hexanoyl chitosan: LiClO4: TiO2composite electrolyte films were prepared by the solution cast technique. The ac conductivity and dielectric properties of the samples prepared have been studied in the frequency range from 100 Hz to 1 MHz over the temperature range from 273 to 333 K. The exponent s in the Jonscher’s universal power law, σ(ω)=σdc+Aωswas analyzed as a function of temperature and the analysis suggests that the conduction mechanism can be interpreted based on the correlated barrier hopping (CBH) model. The barrier heights, WMwere calculated. The values of WMare found to decrease with increasing temperature in the same manner as the exponent s. Both dielectric constant and dielectric loss decrease with increase in frequency and increase with increase in temperature.
Synthsis of [1,2,5]thiadiazolo[3,4-C]pyridine: A Novel Analogue to BT
Authors: Sun Xiao Xia , Lou Ya Zhou , Chen Qiang Qiang , Li Li , Zhuang Xiao Xiao , Li Ying Chun
Published: September 2011

Heterocyclic electron-poor monomer [1,2,5]thiadiazolo[3,4-c]pyridine have been synthesized in high yields over five steps from readily available starting materials. The new deficient acceptor has good solubility in organic solvents so as to permit an appropriate coating process.
Methanol Induced Changes in Structure and Properties of Dry Spinning Fibers of Regenerated Silk Fibroin
Authors: Ma Yan Long , Zhu Jing Xin , Shao Hui Li , Hu Xue Chao
Published: September 2011

The as-spun fibers, which be produced by dry spinning technique, were treated with methanol solution. The results showed that the morphology, structure and mechanical properties of the as-spun fibers had changed. Before methanol treatment,the as-spun fiber had a smooth surface, after methanol treatment, the fiber exhibited rough surface and banded features along the fiber axis. The structure of the as-spun fibers changed from random-coil or silk I conformation to silk II conformation and the breaking intensity of the as-spun fibers were improved after methanol treatment. Compared with degummed silk fibers, the fibers treated with methanol had higher module, but the breaking elongation was lower, the fibers were still brittle.
Synthesis and Characterization of Ln(Mg0.5Ti0.5)O3 (Ln=La, Nd, Sm) Obtained by the Polymeric Precursor Method
Authors: Liang Bing Liang , Zheng Xing Hua , Tang De Ping , Ai Yun Long
Published: September 2011

Ln(Mg0.5Ti0.5)O3 (Ln=La, Nd, Sm) powders were prepared by polymeric precursor method. After calcined at the temperature range of 600 °C to 1300 °C, the powders were characterized by XRD, SEM and FT-IR. The results indicated that Ln(Mg0.5Ti0.5)O3 perovskite crystal phases were formed when the precursor powders were calcined at 800 °C and the crystallization of Ln(Mg0.5Ti0.5)O3 powders increased gradually with the increasing calcining temperature.
Preparation and Property of Epoxy Based Nano-SiO2/TiO2/Polyimide Hybrid Enhanced Sizing
Authors: Zhou Cun , Cheng Jian Li , Sun Yu
Published: September 2011

Abstract: An epoxy based nano-SiO2/TiO2/polyimide hybrid enhanced sizing for carbon fiber was prepared by modified SiO2/TiO2precursor in PAA collosol with silane couple agent(WD-50) and eligibility surfactant via sol-gel reaction, and both ultrasonic cavitation and multi-complex technology were used during the process. The properties of PAA-SiO2-TiO2hybrid sizing and micro-morphology of carbon fiber surface were analyzed by FTIR, DSC, Particle Size Analyzer and STM. The results indicated that nanoscale SiO2•TiO2particles dispersed in the hybrid sizing film homogeneously, and a layer with nano particles was formed on carbon fiber surface after treated by the hybrid enhanceing sizing. The roughness was increased and interface properties of carbon fiber would be improved. At the same time both tensile strength and the interlaminar shear strength were increased obviously.
Preparation and Characterization of Superparamagnetic Fe3O4 Nanoparticles with Controlled Sizes
Authors: Qu Jian Bo , Jing Guang Lun , Xu Hai Long , Zhang Xiao Xiao
Published: September 2011

A facile chemical approach of preparing magnetic Fe3O4nanoparticles with controlled sizes was developed by microwave-assisted co-precipitation method. By changing the synthetic conditions, particle diameter can be tuned from 9.6 to 19 nm. The results indicate that the hydrothermal temperature (HT) and consequent aging time play important roles in controlling of the particle size and crystallization.
Design and Preparation of Light-Weight Radar Absorbing Material Based on Resistive Frequency Selective Surfaces
Authors: Sun Liang Kui , Cheng Hai Feng , Zhou Yong Jiang , Jun Wang
Published: September 2011

Light-weight radar absorbing material (RAM) based on resistive frequency selective surfaces (FSS) was designed and prepared. The principle of the resonances of the RAM was analyzed by calculating the impedance of the FSS and the grounded substrate according to the equivalent circuit method, and the results show that a wideband absorbing structure can be gained by producing two adjacent resonances. After design and optimization by Genetic Algorithm (GA), the RAM with absorbing bandwidth of 7.5~18GHz below -10dB was obtained, whose thickness is only 3mm. The designed RAM was gained by preparing resistive patches on the grounded dielectric substrate of rigid polyurethane foam using screen painting technology. The density of the absorber is only 0.2g/cm3, the reflectivity was measured and it shows that the experimental result is consistent with the design one.
Study on the Model of Magnetic Flocculation of Magneto-Rheological Fluid
Authors: Zhao Si Hai , Luo Tie Nan
Published: September 2011

Magneto-rheological fluid (MRF) is non-colloidal suspension. In this paper, it is introduced that MRF will produce magnetic coagulation at an applied magnetic field by analyzing the interact energy between particles in MRF, and the coagulation is chain-like flocculation. The main reason that MRF produced magnetic coagulation is the direction between chain-like structure and magnetic field is the same. According to the studies above, the formula of yield stress for MRF at an applied magnetic field can be deduced. It can be seen from the formula that there is a square relationship between yield stress of MRF and particle magnetization, and the yield stress of MRF is closely related with volume concentration. The conclusions above match the results of existing experiments very well.
Growth Characteristics, Microstructure and Corrosion Resistance of Micro-Arc Oxidation Coatings Fabricated on ZK60 Mg Alloy under Two Steps Voltage-Increasing Mode
Authors: Lu Sheng , Tang Li , Jiang Xi Zhi , Wang Ze Xin , Chen Jing
Published: September 2011

A concept of two steps voltage increasing mode derived from constant voltage mode was developed to fabricate micro-arc oxidation (MAO) coatings on ZK60 Mg alloy. Growth characteristic, microstructure and corrosion resistance of coatings were investigated and compared with the constant voltage mode. An additional and distinguishing stage is found and regarded as a coating regrowth stage playing an important role on coating thickness. Effects of increase value of voltage were also investigated. It shows that rougher and thicker coating is formed for higher value of voltage. And it is more likely to induce destructive arc discharge for excessive increase value, thus leads to a looser and less corrosion resistant coating. The coating formed under two steps voltage-increasing mode of 280-360V exhibits the best corrosion resistance.
The Optical Properties of DLC Films Processed by Laser Radiation
Authors: Chen Yin Feng , Xu Jun Qi , Su Jun Hong , Han Ling Xia
Published: September 2011

Diamond-like carbon (DLC) films have being widely applied in various domains owing to their excellent optical and mechanical properties, chemical inertness and bio-compatibility[1,2]. But it generally exhibits low a laser induced damage threshold (LIDT).As to infrared protective films, DLC films were asked to be a high laser damage threshold. So far, the real reason of laser damage is unclear. In order to understand the real reason of the laser damage, it is necessary to deeply research the relationship between optical properties and laser radiation. In this paper, optical properties post irraditing by various laser energy were inverstigated. Hydrogen-free amorphous carbon films were deposited by unbalanced magnetron sputtering with a graphite target on Si substrate in this paper. The DLC films were radiated with raster scans methods by a 1064nm and 8–10 ns laser in this work. The transmittance, refractive index, extinction coefficient and surface morphology of DLC before and after radiation were examined by fourier transform infrared spectrometer, ellipsometer and talysurf respectively. The influences were considered as function of laser energy density.The optical properties before and after laser radiation were compared. It is found that as laser fluences rise from 0 to 0.5 J/cm2, the transmittance peak reduce from 67.06% to 58.27%, the refractive index decrease from 1.88 to 1.67(λ=1200), the extinction coefficient increase from 0.07 to 0.32(λ=1200), and the surface roughness become 149.28nm in this procedλure. Especially, the reasons of change were expounded in this paper.
Study on CO2 Emission in the Process of Dealing with Vanadium-Titanium Magnetite
Authors: Qin Jie , Xue Xun , Deng Jun
Published: September 2011

Situations of the CO2emission in steel industry at home and abroad are introduced in this paper firstly. Then CO2emission is calculated in the RHF—EAF flow for treating V-Ti magnetite according to data from the pilot plant in Pangang Group. Besides, CO2emission of the traditional BF process is calculated as well. The results show that CO2emission is 1427.3kg/t pig iron and 1508.7kg/t for the pilot and BF process, respectively. Otherwise, the difference between the two processes is analyzed and the prospect for the reduction of CO2emission in the iron and steel industry is proposed as well.
Experiments on Preparation of Cutting Tool Edge Using Abrasive Water Jet
Authors: Yang Zhen , Lei Yu Yong , Zou Hu , Lv Hua , Jia Wei Guang
Published: September 2011

Preparation of cutting tool edge using micro abrasive water jet is proposed in this paper. A specific designed water jet machine tool with four axes was developed. Also a specially designed abrasive nozzle assembly for preparation of cutting tool edge has designed. The inside diameter of orifice is Ø125μm. The abrasive nozzle has three sections, i.e. the contraction section, the cylinder section and the diffusion section. The diffusion section has a quasi rectangular profile. Experiments on preparation of coated inserts of cutting tool using micro abrasive water jet have been carried out. The silicon carbide solid abrasive with 400 meshes was used during the experiment.The results show that the sharp edge was rounded by micro abrasive water jet. A honed edge with very small radius exists and irregular zigzag edge was disappeared after preparation. Experiments also show that the linear waviness on the surface was eliminated completely by preparation process. The surface roughness of the coated inserts increased to Ra 0.526μm from Ra 0.025μm after preparation. It demonstrates that the tool edge strength could be enhanced and the micro defects could be eliminated during this course. It proved that preparation of cutting tool edge by micro abrasive water jet is feasible and practical. Because of effective, efficient, environmental friendly and higher quality compared with other preparation method, it has promising application in the field of cutting tool manufacturing.
The Synthesis of Novel Chiral Organic Light-Emitting Material: 2R,3R-Di(tert-Butanesulfiny)Thiophene
Authors: Zhuang Xiao Xiao , Sun Xiao Xia , Li Li , Li Ying Chun
Published: September 2011

A mide, simple and efficient synthetic procedure for the preparation of 2,3-di(tert-butanesulfiny)Thiophene and key intermediates, chiral tert-Butanethiosulfinate have been developed. The procedure described herein offers several advantages, including high product yields, easy purification, and large scale production. 2,3-di(tert-butanesulfiny)Thiophene has good solubility in organic solvents.
Design of Gold Bead Chain Machine Based on Modern Design Methodology
Authors: Li Guang Lei , Zhu Gui Hua , Luo Chang Jie , He Kai , Du Ru Xu
Published: September 2011

This paper presents the design of a gold bead chain machine. The gold bead chain machine is designed for automatic gold chain process. Firstly, the gold bead chain’ structure and the design requirement are discussed. Then, based on the modern design methodology, the authors design the gold bead chain machine by using black-box to get the morphological matrix of the function and the function unit solutions. Lastly, the authors analyze and choose the optimal scheme and make an integration of the function unit solutions.
Study on Sintering Process of Magnetic Abrasive Particles
Authors: Chen Yan , Zhang M.M. , Liu Z.Q.
Published: September 2011

The magnetic abrasive prepared by sintering method, the aim is to change the internal structure of abrasive particles by sintering method, make the abrasive particles parceled on the surface of magnetic iron particles, and compared with the abrasive particles phase to get a kind of magnetic abrasive particles with high durability, strong magnetic, which can be magnetized in a magnetic field and improve processing efficiency and surface quality in magnetic abrasive machining. Sintering is used to prepare magnetic abrasive in this paper, to make iron particles, abrasive particles mixed with some binder, after suppression, drying, sintering, cooling, crushing and screening. This paper makes analysis for surface morphology and composition of the magnetic abrasive particles by scanning electron microscopy and discusses the effect that the abrasive particles size ratio, sintering time, sintering temperature on the magnetic abrasive, and the preparation of the magnetic abrasive process has been optimized.
The Influence of Forming on Collision Performance of TRIP780 and HSLA340 Steel Parts
Authors: Liu Ren Dong , Zhu Guo Ming , Lu Chao , Wang Fu , Lin Li , Kang Yong Lin
Published: September 2011

Based on cold rolled TRIP 780 and HSLA 340 steel sheet, the stamping of U-beam and its springback was studied experimentally and numerically. Collision analysis model of closed hat section beam was established on the basis of simulation analysis of U-beam stamping and springback. Mapping was used to transfer results of thickness, stress and strain from U-beam forming part to impact structural part. Collision processes of closed hat section were analyzed under various operating conditions considering the influence of forming. The results show that thickness variation, residual stress, and work hardening of the material after forming affect collision processes directly. The current paper provides reference for improving precision of simulation for vehicle collision.