bluuebunny/crossref_metadata_2025 huggingface dataset:
Effects of Substrate Temperature on Structure and Properties of Al-F Co-doped ZnO Thin Films
Authors: Ma Rui Xin , Li Shi Na , Suo Guo Quan
Published: December 2012

ZnO:(Al, F) thin films on glass substrates have been prepared by RF magnetron sputtering. The influence of substrate temperature on the microstructure,optical and electrical properties of ZnO(Al,F) films have been studied. The effects of substrate temperature on structure and optical and electronical properties of ZnO:Al:F thin films were investigated by XRD,SEM,UV-Visible spectrophotometry and four-point proble method.Experimental results indicate that substrate temperature affects the structure and properties of the thin films considerably.The lowest resistivity obtained in this study was 9.95×10-3 Ω∙cm for the film with average visible transmittance of 90% which was deposited at the substrate temperature of 300°C.
Influence of Deposition Time on the Properties of Highly-Oriented SnS Thin Films Prepared Using the Thermal Evaporation Method
Authors: Nwofe Patrick. A. , Reddy K. T. Ramakrishna , Miles Robert W.
Published: December 2012

The influence of deposition time on the properties of SnS films grown using the thermal evaporation was reported. The deposition time was varied between 0.7 – 3 min, keeping other deposition variables constant. The layers showed single phase with orthorhombic crystal structure, exhibiting a strong (040) reflection. With an increase of deposition time, the Sn/S atomic ratio and grain size and the number of crystallites in the layers increased while the dislocation density and bulk resistivity decreased. The increase of crystallinity of the layers was confirmed by the change of strain from tensile to compressive with increasing deposition time. The transmittance of the films were > 70% for deposition time ≤ 1min and decreased drastically otherwise. The energy band gap varied in the range 1.80 - 1.30 eV with the lower values obtained at longer deposition times.
Experimental Study on Dynamic Measurement of ELID Oxidation Film Thickness Based on LabVIEW
Authors: Ma Bao Ji , Lian Yu
Published: December 2012

According to the formation mechanism and characteristics of ELID oxidation film, based on the LabVIEW development platform, the oxidation film thickness was measured by using the laser displacement sensor and eddy current displacement sensor. And the experiments show that it is a feasible method to use laser and eddy current sensor to measure the thickness of oxidation film, the static and dynamic measuring deviation is 6 μm.
Study on Properties of Dye-Sensitized TiO2 Films
Authors: Cong Wei , Li Jiang , Han En Xiang
Published: December 2012

TiO2nanoporous thin films were fabricated by the hydrothermal method using tetrabutyl titanate as the precursor and used to assemble dye-sensitized solar cells. The properties which include the short-circuit photocurrent(ISC),open-circuit voltage(VOC) and the fill factor(FF)of the solar cells were tested. The microstructure of titania films were modulated by changing the hydrothermal reaction temperature and the amount of PEG and the influence on the properties of the solar cells by titania films weas studied. The results indicate that there are better photoelectric properties for TiO2films at the hydrothermal temperature fo 230°C and the additive amount of PEG being 5% of the mass of TiO2. ISC,VOCand FF was 12.42mA, 681mV, and 0.52 respectively, the photoelectric conversion efficiency(η)was 4.37%．
Research on Property of Polyvinyl Alcohol Sustained-Release Film
Authors: Hao Xi Hai , Xiao Ying Zhe
Published: December 2012

Polyvinyl Alcohol (PVA) sustained-release film is prepared using partial alcoholysis PVA and total alcoholysis PVA to study mechanism of the sustained-release film. The permeable rate of the PVA sustained-release film is measured using distilled water. The influence factors to the sustained-release speed are discussed, the swelling ratio and dissolve weight loss rate of PVA sustained-release film are measured, and its stability is studied. It is shown in result that with the increasing of the ratio of partial alcoholysis PVA BM-I(1788), the sustained-release speed increases gradually; the thinner the film, the larger the sustained-release speed; the swelling ratio reaches its maximum value when PVA BM-I(1788) ratio is 30%; the film has good, it can maintain the sustained-release property in relatively long time.
Packaging Films of Modified Polyethylene by Nano SiO2-EVA
Authors: Xu Wen Cai , Li Dong Li , Fu Ya Bo , Shang Wei
Published: December 2012

In this work, the properties of LDPE were modified by SiO2-EVA (Ethylene Vinyl Acetate copolymer) composite, while EVA contributed to prevent nanometer SiO2 particles from conglomerating. The results show that the polarity of nano-modified PE films increase from 30 dyne/cm to 35 dyne/cm, the friction coefficient drop 1/2 by itself, and the surface resistance decrease 2~3 magnitudes compared with the un-modified. Also, the crystallization of the films and the crystal particles increase effectively due to addition of nano-SiO2. Hence, the thermal stabilization and elastic modulus of the films can be enhanced, so as to improve the comprehensive properties and reduce existed problems of PE films in applications of printing and packaging industry.
Effect of Laminar Flow to Velocity Exponent of Viscous Damper
Authors: Wang Wei Ning , Yan Wei Ming , Chen Yan Jiang
Published: December 2012

The relationship between the energy dissipation and the damping force is studied through experimental and analytical research of the effect of laminar flow of viscous damper, and a linear viscous damper model and the calculation formulas are obtained.The results show that the linear flow model is the key factor to get a linear relationship between speeds and damping force.
Solid-State Chemical Reaction Synthesis and Characterization of Nanocrystalline CePO4 under Ultrasonication Spectra
Authors: Li Dao Hua
Published: December 2012

Under the conditions of the presence of surfactants and ultrasonication, the use of different cerium salt, respectively, with phosphate under solid state chemistry reactions, the synthesis of nano-rare earth metal complexes of CePO4 crystals was formed. The solid phase was characterized by powder X-ray diffraction and electron diffraction. The particle size, its distribution, and morphology of the prepared nanocrystallite were observed by transmission electron microscopy. The results show that particle sizes are relatively uniform, the morphology of the crystal is spherical, the average particle diameter is about 50 nm, and the yield rate is approximately 92.8%. Furthermore, during the synthesis, the solid-state reaction conditions including raw materials, matching proportion of reactants, additions of inert substance, addition of trace solvents, surfactants and porphyrization time, etc, all have some influence on the morphology, particle size and size distribution of the final products. During the synthesis of the nanocrystalline CePO4, the solid state reaction conditions such as changing reactant, matching proportion of reactant, adding inert substance, joining a little solvent or surface active solvent and grinding at different times may influence morphology, particle size and the size distribution of final products.
Analysis about Isolation Floor Consisting of FPS System and Dish Spring
Authors: Ge Nan , Chen Hai Bin , Yao Li Ting
Published: December 2012

A theoretical analyzing approach about the compound floor isolation system consisting of FPS and dish spring is derived. It starts from the Lagrange equation, with the coupling effect of the horizontal vibration and vertical vibration being included. Computation results show that for the proper specifications the floor isolation system may exhibit good effectiveness in mitigating the acceleration of the unfixed objects or equipments in both horizontal and vertical direction, while the extra displacement could be limited to be in a manageable range. The expected parameters for mitigating the accelerations agree with that for displacements in a partial domain. The specification of a floor isolation system needs low friction coefficient on the slide 0.05<μ<0.1, a reasonable slide radius 0.5<μ<1.0m, a relatively low stiffness coefficient and relatively high damp coefficient of the dish spring.
Study on the Grouting Reinforcement and Stability of a Tailings Initial Dam
Authors: Wang Guang Jin , Kong Xiang Yun , Liang Qiang , Si Yue Tong
Published: December 2012

The safety operation of tailings initial dam is the necessary conditions to ensure that the tailings dam is steady. In view of the poor construction quality and the appearing of jet shape seepage with the tailings leak in a tailings initial dam, the thesis analyzed the dam composite of tailings initial dam, the study of dam stability was carried out in the different working conditions and the disaster prevention measures was discussed. The research results indicated that the cementation was better and the strength of rock-soil body was higher in the upper dam body of tailings initial dam. However, the gravel cementation was weaker and strength of rock mass was relatively lower in the bottom dam body of that. Based on the poor quality of construction and penetrating seepage with the tailings initial dam, it should be feasible to adopt the grouting reinforcement way so as to reinforce the tailings initial dam. But the grouting pressure should be not more than 0.2 MPa. It will rely on increasing the dam self-respect and decreasing reservoir water level in the grouting process to reduce the risk of landslide. The research results can provide the theory basis on the disaster prevention and control of the tailings initial dam.
Seismic Performance of a Multi-Story Composite Frame with Partial Shear Interaction and Partial Strength Joints
Authors: Valente Marco
Published: December 2012

This study investigates the influence of partial shear interaction and partial strength beam-to-column joints on the seismic performance of a multi-story composite frame. The moment-rotation relationship of the beam-to-column joints and the force-slip curve of the beam-to-slab connections have been calibrated on the basis of available experimental tests. The results of the numerical investigations show that the energy dissipation of the composite frame increases by reducing the shear connection degree. The shear connection degree has a significant effect on the total dissipated energy in case of rigid joints, whereas in case of partial strength joints the contribution of the joints to the dissipated energy is predominant. Low shear connection degrees can provide a source of dissipated hysteretic energy, above all in case of rigid joints, and can reduce the ductility demand on other parts of a composite frame, such as partial strength beam-to-column joints. However, the shear connection degree should be high enough in order to protect shear connectors from failure.
Investigation of Surface Roughness in Hardened GCr15 Steel Turning with Mixed Ceramic Insert
Authors: Cui Bo Di
Published: December 2012

An experimental investigation was conducted to determine the effects of cutting conditions on surface roughness in finish hard turning of GCr15 steel with mixed ceramic inserts based on design of experiment. The influence of cutting speed, feed rate and nose radius on surface roughness was assessed using analysis of variance (ANOVA). The result indicated that the feed is the dominant factor on surface roughness followed by nose radius. Due to the complexity of machining process, artificial neural network (ANN) was employed to develop the predictive model of surface roughness. Simulations were done to describe the relationship between surface roughness and cutting parameters based on the proposed model.
Determination of Coated Substrate Roughness by Quantification of Measured Depth Profiles
Authors: Wang Xiao Yin , Jian Wei , Liu Yi , Rao Shao Ping , Zhu Xing Xing , Han Yi Shan , Wang Jiang Yong
Published: December 2012

The glow discharge optical emission spectroscopy (GDOES) depth profiles of zinc-coated copper substrates polished by different mesh size sandpapers are well fitted with the mixing-roughness-information (MRI) model. Based on the MRI fits, the copper substrate roughness parameters and the coating layer thickness values are extracted. Using the so-called 84% to 16% method, the depth resolution values of the measured GDOES depth profiles are obtained, thereby the respective roughness parameters are determined. The obtained zinc-coated copper substrate roughness values are correlated with the experimental measurements.
Research on Micro-Structure of Electroless Ni-B Coatings
Authors: Pan Jian Xin , Chen Ru Jun , Wu Cui Lan
Published: December 2012

By means of X-ray diffractometry (XRD) and transmission electron microscope (TEM), the micro-structure of 5 different Ni–B alloy coatings prepared by electroless plating with Potassium borohydride content ranging from 0.2 to approximately 1.4g/L was studied The influence of the KBH4 content in the coatings on their micro-structure was also investigated. It has been found that Ni–B alloy coatings showed amorphous sytuctue with XRD while with TEM it showed a combination of amorphous and nanocrystalline structure. It was further revealed that the amorphous structure increased with increasing KBH4 content, which means that Ni-B alloy coating prepared with increasing KBH4 content undergoes a transition process as follows: nanocrystalline → crystalline → amorphous structure. Results indicated that the micro-structure of Ni-B alloy coatings should be studied by both methods of XRD and TEM.
A Comparative Study: Effects of Two Different Surface Engineering Technologies on Tribological Properties of Pure Titanium
Authors: Tong Yu , Guo Tian Wen , Wang Jing , Liang Hai Feng , Mi Qian
Published: December 2012

Two different surface engineering technologies, plasma nitriding and titanium nitride (TiN) film deposition by closed-field unbalanced magnetron sputtering (CFUBMS), were used to improve the tribological properties of pure titanium. Surface characteristics were evaluated by microhardness tester, scanning electron microscopy(SEM), X-ray diffraction (XRD) and pin-on-disc tribotester. The influence of the two surface treatments on wear resistance of titanium was investigated. After plasma nitriding or TiN film deposition by CFUBMS, the microhardness of the surface increased approximately 3 to 5 times when compared with that of untreated pure titanium and the wear resistance was improved significantly. The wear resistance of TiN film deposited titanium specimens was higher than that of plasma nitrided ones.
Improvement and Sensitivity Analysis of Placement Angle Optimization in Physical Vapor Deposition Process
Authors: Sapsaman Temsiri , Bland Sasithon
Published: December 2012

Widely used to improve the lifespan of tools, Physical Vapor Deposition (PVD) coating process yields hard coating film by creating high-energy beam of coating particles or plasma ions. The quality of the coat is largely depended on its evenness, which is achieved solely by the know-how and experience of coating companies. In dealing with a large, unfamiliar-shape workpiece, coating companies need a logical way to determine the optimal placement of the workpiece in the PVD oven. This work presents the improvement of placement angle optimization for a five-degrees-of-freedom jig fixture with self-rotation. The sensitivity of errors in the physical placement is found to be small.
Preparation of Two-Package Inorganic High-Temperature Paint
Authors: Li Guo Jun , Yang Jing , Zhao Xiu Juan , Ren Rui Ming
Published: December 2012

A waterborne two-package inorganic high-temperature paint was prepared by using silica sol and methyltrimethoxysilane (MTMS) as the film-forming raw materials. The results showed the talc powder not only kept viscosity of paint stability but also increased construction time. The coating on the treated aluminum alloy was obtained through spraying and curing. The coating cured at 60 oC had higher density and breakdown temperature, good physicochemical properties, heat resistance property and electrical strength.
A Convenient Strategy to Control the Specific Surface Area of the Mesoporous Silica by Using the Poly(pseudo)rotaxanes Template
Authors: Zu Lei , Zhi Yu Yuan , Gu Kai , Lian Hui Qin , Cui Xiu Guo
Published: December 2012

The poly(pseudo)rotaxanes formed by β-CD and F127 was used as the template to prepare the mesoporous silica. The specific surface area, pore size distribution and pore volume of the mesoporous silica could be controlled by simply changing the poly(pseudo)rotaxanes forming time. A series of samples with different template forming time were prepared to investigate the various specific surface area and pore size of the mesoporous silica. The morphology, composition, specific surface area and pore size of the mesoporous silica particle were investigated by the scanning electron microscopy, Fourier transformation infrared spectroscope, and N2 adsorption–desorption measurement.
Study of Degradation of Photocatalytic Methyl Orange on Nano NdxCo2-xZr2O7
Authors: Bai Yun Shan , Chen Song , Lu Lu De , Bao Jian Chun
Published: December 2012

Cubic pyrochlore type NdxCo2-xZr2O7 nano-crystals were prepared by salt-assistant glycine solution combustion method (SGCM), with neodymium nitrate, cobalt nitrate and zirconium nitrate as raw materials, glycine as the incendiary agent, and KCl as a reaction inert salt. The NdxCo2-xZr2O7 nano-crystals were characterized by means of XRD (X-ray powder diffraction), FT-IR (Fourier trans-form-infrared spectroscopy), Raman spectroscopy, TEM (Transmission electron microscope) and HRTEM (High resolution transmission electron microscopy). The results showed that neodymium ions were partially substituted by cobalt ions, while maintaining the original pyrochlore structure. The nano particles obtained had a perfect crystal structure, good dispersion, and the size was about 31nm. For Nd1.9Co0.1Zr2O7 nanocrystals, the four strong diffraction peaks were at 2θ=29.18°, 33.80°, 48.49° and 57.53°. The corresponding crystal plane distances calculated by Bragg equation λ = 2dSinθ were 0.306, 0.265, 0.188 and 0.160 nm. With the study of the photocatalytic activity of the product, it is found that compared with the undoped crystals, photocatalytic activity of dopped products had been significantly improved and different doping amount led to different levels of catalytic activity. When nNd:nCo = 9:1, the 2 hours net degradation amount was as high as 83%.
Mechanical Milling Prepared Nano-Sized Al2O3 Particles Utilized in Electroless Plating Ni-P- Al2O3 Composite Coatings
Authors: Yu Ai Zhi , Li Mao Dong , Lin Jin Mei , Zhang Shu Kuan
Published: December 2012

In this paper, nano-sized Al2O3 particles were prepared by mechanical milling, and Ni-P-Al2O3 composite coatings were plated on Q235 steel substrates, which plating solutions were containing different concentrations Al2O3 particles. The morphology, phase and particle size distribution of the as-prepared Al2O3 particles, and the properties of the coatings were investigated. The results show that, the morphology of the as-prepared Al2O3 particles were spherical and almost size under 100nm, the coatings were uniformly thickness and the Al2O3 particles were uniformly dispersed in the coatings, after heat treatment, the micro-hardness and wear resistance of the coatings were significantly improved, compared with the chemical method prepared Al2O3 particles, the mechanical method prepared Al2O3 particles had the same performance in improving the micro-hardness of the coatings.
Surface Redox Initiated Polymerization to Prepare the Poly(N-isopropylacrylamide) Coating
Authors: Liu Yan Zhi , Liu Yan , Zhao Su Rui , Li Yi Jing
Published: December 2012

A hydroxylated silicon substrate was modified with 3-aminopropyltriethoxysilane (APTES) monolayer, followed by the surface initiated graft polymerization of the N-isopropylacrylamide (NIPAm). The microstructure of poly(N-isopropylacrylamide) (PNIPAm) coating was examined by X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM), respectively. And the results showed that about 50 nm thickness of PNIPAm coating grafted successfully.
Effects of Fuel Gas on the Microstructure and Mechanical Properties of HVOF Spraying WC-12Co Coating
Authors: Liu Yan , Gou Gou Qing , Chen Hui , Wang Li Jun , Tu Ming Jing , Yu Jin Peng
Published: December 2012

In this paper, WC-12Co coating are prepared by two HVOF systems. The biggest difference between these two systems is the fuel gas use. Morphology and mechanical properties of the coatings are analyzed. The results show that the coating sprayed with Airplane Kerosene fuel gas is denser and the WC particles distribute more even than that sprayed with propane fuel gas. And the WC particles melt more fully. The hardness, Young’s Modules and fracture toughness of the coating sprayed with Airplane Kerosene fuel gas is higher than that sprayed with propane fuel gas.
The Influence of Supports on the Surface Properties of PtNi Bimetallic Catalysts
Authors: Abu Bakar Noor Hana Hanif , Bettahar Mohammed M. , Abu Bakar Mohamad
Published: December 2012

A series of Pt100and bimetallic PtNi catalysts were prepared on various supports namely amorphous silica (Degussa), crystalline silica (Chempure) and cerium oxide (CeO2). The samples were prepared via precipitation method using NaBH4as a reducing agent. H2-TPR analysis revealed that total reduction of the metal salts to metal particles occurred during this stage. All catalysts were tested for the hydrogenation of benzene to cyclohexane. It was found that the catalysts exhibited a decrease in the catalytic reactivity in the order of amorphous silica, crystalline silica and CeO2. This is mainly due to the surface area and acidity of the support. Comparison of the PtNi catalysts with their respective monometallic catalyst showed that only the PtNi prepared on Chempure exhibited an enhanced reactivity. This is due to alloying of PtNi. For catalysts prepared on Degussa, the low H2-chemisorption properties as well as lack in Pt peak shift in the XRD profiles leads to the believe that Ni and Pt may exist separately. H2-TPD analysis supports these findings.
The Preparation of Silver-Spray Plated on PET Filament
Authors: Zhan Jian Chao
Published: December 2012

Non-continuous nano-silver layer deposited on the PET filament by the use of vacuum sputtering technology and then become continuous with the help of newly electroless spray plating process.The functionality and durability of the Silver-coated PET filament was tested and analyzed. The results showed that it has good electrical conductivity. With the weight increasing goes up, the electrical conductivity increases obviously,then prone to slow increment .
Influence of Nano Particle on Flexural and Impact Properties of Sandwich Structures
Authors: Anbusagar N.R.R. , Giridharan P.K. , Palanikumar K.
Published: December 2012

This paper investigates the influence of nanoclay content on sandwich composites under flexural and impact loading. Four different combinations of sandwich samples were made of fiberglass/nano-modified polyester as face sheets and polystyrene foam as core materials. The tested samples showed that the flexural and impact properties are greatly increased, over the range of nanoclay loading.
Computation and Simulation of 5-Axis Cutter Based on Scattered Point Cloud Data
Authors: Zhao Wen Hui , Liu She
Published: December 2012

The complex surface is modeled by triangular surface, B-spline or non-uniform rational B-spline first and then the planing of the cutter is followed in reverse engineering. But this require CAD/CAM software and operator’s experiene. Because of this，the research on direct NC cutter generation from point cloud have become the focus of research in reverse engineering. The normal，curvature，surface vary et al parameters are calculated by principle component analysis method and so on, which define the local feature of the surface hidden in the point cloud. Then，based on local feature，point cloud is simplified. It is proved that two points with minimal orientation-distance on a pair of smooth surfaces are conjugate points. Thus the conjugate problem between the tool surface and the part surface is converted into optimization process of orientation-distance function. The cutter trace and the cutter interference are achieved by local and global optization of the orientation-distance function.
Chaotic Cat Swarm Algorithms for Global Numerical Optimization
Authors: Yang Shi Da , Yi Ya Lin , Shan Zhi Yong
Published: December 2012

A novel Chaotic Improved Cat Swarm Algorithm (CCSA) is presented for global optimization. The CSA is a new meta-heuristic optimization developed based on imitating the natural behavior of cats and composed of two sub-models: tracing mode and seeking mode, which model upon the behaviors of cats. Here different chaotic maps are utilized to improve the seeking mode step of the algorithm. Seven different chaotic maps are investigated and the Logistic and Sinusoidal maps are found as the best choices. Comparing the new algorithm with the CSA method demonstrates the superiority of the CCSA for the benchmark functions.
Quantification of N2+ Implanted AES Depth Profiling Data in Al
Authors: Rao Shao Ping , Liu Yi , Wang Xiao Yin , Jian Wei , Wang Jiang Yong
Published: December 2012

The nitrogen implanted profile in aluminum generated by 60keV N2+ bombardment is simulated numerically by the Stopping and Range of Ions in Matter (SRIM) program and is fitted analytically by the Schulz-Wittmaack expression. Taking the SRIM simulated profile as true concentration-depth profile of implanted nitrogen in aluminum matrix, the corresponding measured AES depth profiling data of implanted nitrogen are well fitted by the Mixing-Roughness-Information (MRI) model.
The Impact of Roundness of Granular Materials on Physical Modeling Results
Authors: Liu Chong Qing , Zhou Jian Xun , Liu Jian
Published: December 2012

The physical modeling, which developed rapidly and applied widely, has been widely accepted as an effective method to study the deformation mechanism and the process of tectonic evolution. Granular materials, which were widely used in the physics modeling, were commonly used to analog the deformation of the upper crust. Some attribute of different materials play an important role in the physical modeling. Many previous studies suggested that the granule roundness determined the angle of internal friction. The detail of their impact, however, is still obscure and poorly understood. Microspheres, beach quartz sand, and artificial quartz sand are used to investigate the impact of the roundness on physical modeling in this case study, using three models with some similar parameters. The present study shows that the microsphere with perfect roundness made it easy to roll, leading to the profile of fold-thrust belt round. Some deformation details are difficult to decode, and the strain distribution was dispersed. The model with artificial quartz sand uplifted highest, due to the angular roundness and the granule are difficult to move. The strain was most concentrated, suggesting significant discrepancy of strain value among different part of the deformation area. Beach quartz sand with appropriate roundness, however, showed the medium performance what we expect in structure physics modeling.
Ship Lines Modeling Theory of High-Speed Ship Based on the Partial Differential Equations
Authors: Li Chun Tao , Qi Xiang , Shi Jian , Shi Zhong Kun , Qi Huan
Published: December 2012

Based on the analysis of molded line geometrical characteristic and boundary conditions of high-speed frigate’s hull by using differential geometry, we report a curve modeling principle to express the hull line geometry through differential geometry application. The starting point of this molded-line automatic generation method is using the planar curve to express 3D surface shape. The first problem to be solved is how to get shape functions which describe every design ship curves via the the hull type curves geometry. The second problem to be solved is how the two-dimensional function, which describe ship lines, transformed to the hull shape function designed of three-dimensional hull surface, namely “mathematic ship”.
Synthesis of Silicon Carbide Nanoparticles from Carbon Nanotubes
Authors: Liu Jing , Wu Rong , Li Jin , Sun Yan Fei , Jian Ji Kang
Published: December 2012

In this paper, we report the synthesis of cubic silicon carbide (3C-SiC) nanoparticles by direction reaction of silicon powders and carbon nanotubes. The as-prepared SiC nanoparticles were characterized by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy and Raman scattering at room temperature. The possible growth mechanism is proposed.
A Production Scheduling Framework Integrated with Simulation Module
Authors: Gu Jian , Mao Wei Min
Published: December 2012

It is necessary to achieve high system performances in terms of throughput rate and service level in today’s business environment. This can be achieved by implementing efficient and effective production planning methods complemented with precise and fast scheduling predictions. A framework is proposed to integrate real-time production data, scheduling mechanisms and simulation for providing realistic scheduling policies that could be used for operational and tactical decision-making. The focus is on the use of discrete event simulation utilizing relevant shop floor data, provided by an ERP system. A primary objective is to evaluate and characterize scheduling policies in a discrete manufacturing environment.
Numerical Simulation for Precision Roll-Forging of Automobile Front Axle
Authors: Li Ru Xiong , Jiao Song Hua
Published: December 2012

Roll forging process for automobile front axle has been simulated by using a rigid viscoplastic finite element method, force-time curve have been obtained and analyzed. On the basis of simulation result, typical characteristics of roll forging process have been explained. It concluded that simulation results could guide the development of roll forging and die design for automobile front axle.
Numerical Simulation of Springback in Stretch Forming with Two Different Grippers
Authors: Chen Xue , Liu Pei Hua , Li Ming Zhe
Published: December 2012

The springback of spherical parts in both integral-gripper and discrete-gripper stretch forming processes were investigated by using explicit-implicit algorithm. The effect on springback value and shape errors of pre-stretching, thickness and materials were studied. The simulation results show that springback and shape errors in the integral-gripper stretch forming are bigger than that in the discrete-gripper stretch forming; the springback gradually decrease and shape errors reduce as pre-strecthing increases, a prior pre-stretching is 1%; the springback and shape errors are gradually reduced as sheet metal gets thicker; the greater the elastic modulus and yield strength of the material, the smaller the springback and shape errors of the formed parts.
Silver Nanoparticles with Enhanced Fluorescence Effects on Fluorescein Derivative
Authors: Yang Chun , Ge Feng Yan , Li Jin Cai , Cai Zai Sheng , Qin Fang Fang
Published: December 2012

Silver nanoparticles were prepared by sodium borohydride reduction method for analyzing metal-enhanced fluorescence property. Some variables including the dosage of reagent, reacting temperature and pH value had been investigated. Subsequently, a comparison of metal-enhanced fluorescence efficiency was made between two kinds of fluorescent dyes, namely fluorescein and 6-carboxyfluorescein at different silver concentrations. The experimental results show that the fluorescence of both dyes are remarkably enhanced. It is interesting to note that the increase of emission intensity is stronger than that of their corresponding excitation ones. Furthermore, a 5.038-fold increase in fluorescence for 6-carboxyfluorescein while a 2.506-fold increase for fluorescein are observed. This may attribute to the interaction between dyes and silver nanoparticels.
Filling Pattern of Step Gating System in Lost Foam Casting Process and its Application
Authors: Zhou Hong , Luo Li Heng
Published: December 2012

To explore application of step gating system in LFC, filling process of two types of step gating system was simulated, their filling patterns were found, and several engineering examples were analyzed basing on these patterns. It was found the metal start filling through all ingates almost simultaneously if the gating system is open, otherwise the sequence of the ingate filling follow increasing sequence of streamline length from the inlet. It was also found the metal volume through each ingate increased gradually bottom-top when the common step gating system is filled by EPS, but when the common step gating system is open or step gating system have an auxiliary sprue, the metal volume decreases gradually. Analysis on several engineering examples shows the simulation confluence of two liquid metal fronts is basically in accordance with the casting defect locations.
The Process Analysis of Commonly Used T-Shaped Tube Compound Bulging Media
Authors: Zhang Ling Yun , Xu Jia Yang
Published: December 2012

As the important bearing structure of aircraft high pressure systems, the properties of air ducts are directly related to the flight safety. In order to improve air ducts formation quality and reduce the forming processing cost, improving the tube bulging processes is needed. The key technology of bulging processes is one of the choices of dielectric bulging, through to the liquid medium, plastic medium, the elastic medium, viscous medium and solid medium forming technology characteristic analysis, this study describes the advantages and disadvantages of various media.
Modeling and Analysis of Process Parameters for Plastic Injection Molding of Base-Cover
Authors: Yin Yan Fang
Published: December 2012

The quality of the plastic part depends on the material characteristics, the mold design, and the process parameters, one of which is more important. It involves many sub-design tasks that determine the cost and performance in the early conceptual mold layout design phase. Base-Cover was injection molded with acrylonitrile–butadiene–styrene (ABS)/polycarbonate (PC) [ABS/PC] alloy resin and its process parameters was analyzed by commercial Moldflow software. The optimum gate location and melt filling time were determined, and the optimum injection temperature was obtained by analyzing the shrinkage of the product after molding. An effective regression model was developed to determine the mathematical relationship between the process parameters (mold temperature, melt temperature, injection pressure, injection time, and cooling time) and the volumetric shrinkage by utilizing the analysis data.
Numerical Simulation on the Microstructure during Extrusion Process of P91 Large Diameter Thick-Walled Tube
Authors: Li Pan , Jian Zhang , Ma Xu
Published: December 2012

The subject of study is the vertical extrusion of P91 large diameter thick-walled seamless steel tube, simulate the variation of microstructure during the abbreviated ratio test. Compare the simulation results and the results of Steel pipe specimens metallographic which were in different extrusion ratio, research the influence of extrusion ratio on microstructure and properties from micro-organizational level, and verify the accuracy of the microstructure evolution of the mathematical model.
Preparation and Characterization of Nano-Ni/B Composite Particles
Authors: Wei Yong Qi , Chen Xin , Han Ai Jun , Ye Ming Quan
Published: December 2012

The synthesis of nano-Ni/B composite particles was studied by diamine hydrate reducing nikel chloride in the water bath at 50 °C, in which nano-Ni was made to cover the surface of micron boron powder. The particle size, the structure and properities of the nano-Ni/B composite particles were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). And the thermal stability of nano-Ni/B composite particles was studied by employing thermogravimetry (TG), differential thermal analysis (DTA). The results showed that this method could prepare the compact coating for Ni/B particles. The nano-Ni particles coated on boron particle were uniform and continuous. The average diameter of Ni crystallites was about 21.7 nm. Compared with boron powders, the high temperature of exothermic peak of nano-Ni/B composite particles was decreased about 36 °C. The thermal chemistry behavior of the as-prepared nano-Ni/B composite particles was better than superfine boron powders.
Optimal Selection of Machining Parameters by Genetic Algorithms for Face-Milling Operations Based on Minimum Unit Machining Time
Authors: Yang Pei Qing , An Li Bao
Published: December 2012

In this paper, the parameter optimization problem for face-milling operations is studied. A mathematical model is developed in order to minimize unit machining time. The machining process needs one finishing pass and at least one roughing pass depending on the total depth of cut. Maximum and minimum allowable cutting speeds, feed rates and depths of cut, as well as tool life, surface roughness, cutting force and cutting power consumption are constraints of the model. Optimal values of machining parameters are found by a genetic algorithm (GA). The influence of tool replacement time and GA operators is evaluated.
The Hot Deformation Behavior and Hot Processing Map of CL60 Rail Wheel Steel
Authors: Zhao Fei , Yan Yan , Ren Yong Hai
Published: December 2012

The hot deformation behavior of CL60 rail wheel steel has been studied by employing both processing maps and microstructural observations. Tests are performed at temperatures of 800—1100°C and strain rates of 0.1s-1—5s-1 and the flow stress data obtained from the tests are used to develop processing maps. The microstructural evolution of deformed samples is also examined on the basis of optical microscopic observations. The result indicates that under experimental conditions this alloy shows dynamic recrystallization(RDX) characteristics during hot compression deformation. Both deformation temperatures and strain rates have obvious influence on flow stress and its corresponding peak strain, which increase gradually with decreasing temperature and increasing strain rate. RDX occurred at higher temperature and lower strain rate.
Research on Surface Roughness Experiment of Flank Milling for the Ruled Surface Blade
Authors: Cai Yong Lin , Yao Di
Published: December 2012

In this paper, the factors affecting the surface roughness by flank milling are selected, and the blade machining experiments are implemented according to the orthogonal table designed, Then, the blade surface roughness are measured using TR200 instrument, and the surface roughness of the blade results are analyzed using visual analysis method and variance analysis method. Finally, the impact of various factors on the blade roughness is obtained, and the optimal process parameters of flank milling aluminum alloy blade are given.
Combined Setting Technology of the Bending Roll in Five Stands 4-High Reduction Cold Mill
Authors: Zhou Lian Lian , Ma Xu Chuang , Kong Ling Kun
Published: December 2012

On the foundation of taking equipment and production technology into consideration,we present a set of combined setting technology of the parameter of the strip suit to cold reduction mill of roll four and framework five。Then the parameter of the strip was controlled combined and coordinated of framework 1-5. On the one hand,it ensures the function of the force of the bending roll not cancel out mutually,and enhances the controlled effect of the force of the bending roll in the strip,on the other hand, there will not be new extra and partial shape wave under the complex effect of the force of the bending roll.Meanwhile there will not be the problem that the force of the bending roll in some parts get too high even overall loading while the other parts get get too low in the setting procedure.While improving the lifespan of the fluid cylinder, the adjusting rest of the force of the bending roll get increased. While the related technology has been adopted by field engineering, we have achieved excellent result, and there is the value for more expanding.
Study on Manufacturing Technology of Resin Bonded Diamond Wire Saw
Authors: Xu Dong Mei , Zhang Hai Bo , Gao Jun , Cong Ming Hui
Published: December 2012

Slicing of silicon, quartz crystal and other hard brittle materials mainly use dissociated abrasive multi-wire saw slicing technology, which exists some shortcomings, such as severe environmental pollution, lower cutting efficiency, etc. So it is bound to be replaced by fixed abrasive diamond wire saw in the future. At present, generally, the manufacturing technology of fixed diamond wire saw includes electroplating method and resin bonded method. Compared with electroplating diamond wire saw, the resin bonded diamond wire saw has obvious advantages, such as simpler production technique, lower cost, higher cutting efficiency, less environmental pollution, etc. In this paper, the polyurethane was chosen as matrix resin of resin bonded, and phenolic resin was chosen as curing agent, the preparation technology of thermosetting resin bonded diamond wire saw, is researched in this paper. Firstly, the effects of various compositions on resin bonded, are researched, then the optimal fomula and the manufacturing technology are determined
In Situ Detection of Thermal Cycle in Weld Metal of Cr-Mo Steel
Authors: Li Hai Tao , Zhu Yong Chang , Rong Shou Fan , Qu Li Jie
Published: December 2012

With the self-designed system of welding thermal cycle test, low alloy steel of Cr-Mo series was welded through proper welding procedure according to the phenomenon of cold crack and local hardening in weld metal, and in-situ detection of thermal cycle for deposit metal was realized. The results show that self-designed system is reliable within the error range, the maximum peak temperature during thermal process was above 1700°C, it is largely improved than reported formerly.
Mathematical Model of Ti-6Al-4V Single Track Formed by Selective Laser Melting
Authors: Sun Jian Feng , Yang Yong Qiang , Liu Jie , Wang Di
Published: December 2012

The single track is the basis of the multi-track overlapping and multi-layer molding in the accumulative manufacturing, and its quality determines the quality of the parts after their being manufactured. The single track experiment on Ti-6Al-4V powders has used Matlab software to fit the experimental data so as to establish the mathematical model. As a result, the experiment has revealed the functional relationships among the width, layer thickness, and power/speed of Ti-6Al-4V selective laser melting single track; and its relationships between its width and layer thickness, width and power/speed, with the period T1=0.0753，T2=0.0542 respectively, satisfy the Fourier series.
Analysis on the Refractory Erosion of the Electric Arc Furnace and Study on the Measures of Protecting the Furnace Lining
Authors: Qin Jie , Qi Jian Ling
Published: December 2012

The erosion situation of the refractories of the deep reduction electric arc furnace have been introduced firstly, including the regions such as furnace wall, tapping hole and slag hole, and analyzing on the causes of the erosion shows that high temperature, chemical erosion of oxides in slag, as well as physical scour are the main causes of the serious erosion to the lining. Based on the practical production conditions three solutions are provided including preventing oxidation of metallized pellets, control the temperature and carrying out hot-spray-mending on the furnace.
Ultrasound-Assisted Solution Synthesis and Characterization of Sea Urchin-Like ZnO Hierarchical Microstructures
Authors: Li Yan Wei , Sun Guang , Qi Feng Xiao , Wu Nai Teng , Cao Jian Liang , Bala Ha Ri , Zhang Zhan Ying
Published: December 2012

ZnO hierarchical microstructures with uniform sea urchin-like morphology have been successfully synthesized through a facile and reliable ultrasound irradiation route by using Zn(CH3COO)2•2H2O and KOH as raw materials. The ZnO sample is investigated with XRD, SEM, TEM and HRTEM. Results indicate that the as-prepared sea urchin-like ZnO microstructures are assembled by numerous needle-like nanocrystals with the size about 2µm in length and about 100nm in diameter. The preferred growth orientation of these ZnO nanoneedles are along [101] direction. A blue shift in UV-vis absorption spectrum of the as-prepared ZnO sample is observed.
Effect of Shock Temperature on the Impact Toughness of Butt-Joint
Authors: You Min , Wu Ling , Yu Hai Zhou , Hu Jing Rong , Li Mei
Published: December 2012

The effect of the shock temperature and time on the impact toughness of the adhesively bonded steel butt joint under Charpy or Izod impact test is studied using the experimental method. The results obtained show that the impact toughness decreases when the shock temperature increased. When the curing time, temperature as well as the open assembly time was set as constant, the higher the shock temperature is, the lower the impact toughness of the joint. Comparing to the Charpy impact test, the Izod impact test is more sensitive to the shock temperature. When the shock temperature is set at a value not less than 300 C, the impact toughness measured is nearly the same as zero due to decomposition, carbonization and volatilization of the adhesive.
The Vehicle Modal Analysis and Test Verification Based on Weld Joints Simulation
Authors: Yang Chang Hai , Jin Xin , Song Hai Sheng , Shi Wen Ku
Published: December 2012

As a reference to some minibus,establishing the Vehicle FEM Model including Body and Frame,and discussing the effect of joint simulation on vehicle modal analysis result;using the method based on environment incentive operational modal parameter identification to obtain vehicle modal,and compare test result with simulation result,it proves that the method of weld joint simulation is more accurate;At last, the FEM Model of Interior cavity is established and the NVH problems of the minibus are found and the improvements are Put forward.
Effects of Welding Time and Alloy Elements on Mechanical Properties of Aluminum/SPCC Joint Using Resistance Spot Welding
Authors: Wang Nan , Yamaguchi Tomiko , Nishio Kazumasa
Published: December 2012

In this study, effects of welding time and elements Mg, Si and Cu in aluminum alloys on hardness and tensile shear strength of aluminum alloys/steel joints in resistance spot welding have been investigated. The welding current was kept a constant 10.5kA and electrode force was 1kN. Welding time was increased from 0.067s up to 0.2s with a rise of 0.033s. Two intermetallic compound layers were generated at weld interfacial zones between aluminum alloys and steel during welding process, and the major phases were FeAl3 adjacent and directing to aluminum alloy and Fe2Al5 adjacent and directing to the steel. Diffusion of Si in aluminum alloy occurred at the interface, whereas the diffusion of Mg and Cu was not observed at the interface according to the EPMA analysis results. Hardness of intermetallic compound layers was 13.8GPa, which was about 12 times as much as that of the aluminum alloy. The largest tensile-shear strength was obtained on the condition of 0.134 and 0.167s welding time.
Solidification Behavior and Phase Relation of Arc Melting La-Fe-Si Alloys
Authors: Dong Zhong Qi , Chen Jin , Jia Jun Li
Published: December 2012

Solidification behavior and phase relation of LaFe13-xSix alloys was investigated using arc melting. Phase formation and structure in arc melted LaFe13-xSix alloys has been investigated by means of power X-ray diffraction analysis and scanning electron microscopy. The results have shown that La(Fe,Si)13 (1:13) phase is a peritectic phase and the solidification behavior and phase relations of LaFe13-xSix alloys are different with Si contents. Under arc melting condition, composition with low Si contents (x=0.5 to 1.5) consist mainly of α-(Fe,Si) phase the same as induction melting. Composition with high Si contents (x=2.0 to 3.0) consists mainly of 1:13 phase. The results were discussed with respect to the effect of cooling rate.