bluuebunny/crossref_metadata_2025 huggingface dataset:
Preparation of Epoxy/Montmorillonite Nanocomposite Coating and its Application in the High-Temperature Oil-Gas Environment with H2S
Authors: Wang Xian Fang , Hu Yin Chun , Li Ya Ping , Zhou Qiong
Published: November 2010

Montmorillonite was introduced into the multicomponent epoxy resin by using the intercalation polymerization. Intercalation effect of epoxy/montmorillonite composite system and the influence of the addition of montmorillonite on the glass transition temperature (Tg), mechanical properties and barrier of H2S to coating under high temperature and pressure conditions were investigated. The results showed that it was easy to intercalate epoxy resin into the organic montmorillonite layers, and the interlayer spacing of Montmorillonite was further swelled. In addition, the epoxy/montmorillonite nanocomposite coating with intercalated/ exfoliated structures were prepared. Compared to pure epoxy coating, the heat resistance and mechanical properties of epoxy/montmorillonite nanocomposite coating were slightly improved, and the barrier efficiency to H2S was substantially increased under high temperature and pressure oil-gas environment.
The Investigation of Effects of Galvanizing Parameters on Microstructure of Al-Zn-Si Coating
Authors: Lv Jia Shun , Li Feng , Yang Hong Gang , Kang Yong Lin
Published: November 2010

In this article, the effects of galvanizing process parameters, especially cooling rate, on the microstructures of coating was investigated. The microstructures of Al-Zn-Si coating were analyzed by the following methods: surface microstructure, cross-section microstructure, thickness and composition of alloy layer by SEM and its accessories, distribution of each element along depth by glow-discharge emission spectrometer, micro-area elemental distribution image analysis of each element distribution on surface and cross-section by electron probe, crystallization orientation by X-ray diffraction instrument. The results showed that coating was made up of aluminum-rich dendrite, interdendritic zinc-rich phase and alloy layer, that cooling rate affected depth of alloy layer in Al-Zn-Si coating directly, that zinc concentrated in the surface layer of coating and silicon in the alloy layer, while the coating has larger depth it also concentrated in the surface layer, that aluminum-rich dendrite has preferred orientation in the solidification process.
Contact Mechanics Analysis of Two Rough Surfaces in Contact
Authors: Xu Zhi Qian , Yan Xiang Zhen , Yang Xiu Juan
Published: November 2010

In this paper, the calculation formulas of the asperity’s deformation related with the surface contact pressure are deduced by using the simplified contact model. Firstly, we assume that the rough surface is composed of a set of cones as asperities, and the cones are arranged in different ways along two directions. Secondly, according to the mechanical analysis of a rigid conical punch on a half-space, the theoretical relationship between the average pressure of the micro contact area and the property parameters of a conical punch is obtained. Meanwhile, the calculation formula of the average pressure is given under the reasonable assumptions, which is related with the asperity’s deformation and the contact pressure. Finally, combining two theoretical relationships above, the quantitative analysis method for micro asperity’s deformation of two rough surfaces in contact is provided by using the average pressure as a connection bridge.
Design and Simulation of Fuzzy Control System in DSCC Processing of Cu Single Crystal
Authors: Xu Hua Ping , Bian Yong Ming , Mao Xie Min
Published: November 2010

Directional solidification continuous casting (DSCC) processing is steady directional growth process of Cu crystal. It was influenced by seven parameters, and very easy to be broken for some disturbance. Therefore, random crystals grew. In this paper, location of liquid-solid interface Z was set as control object. And correction disturbance closed-loop control was set as general control planning in DSCC processing. Then fuzzy control was selected as control mode. And control algorithm was designed. The closed-loop control process in DSCC processing was simulated. The simulation results showed that control object could return to safe rang even existing random disturbance. And the control process had good stability. Designed fuzzy control device could satisfy DSCC process requirement.
The Effect of QPQ Salt-Bath Nitriding on Microstructure and Wear Resistance of 4Cr5MoSiV1 Steel
Authors: Yu Ying Xia , He Bo Lin , Shi Jian Ping
Published: November 2010

In this paper, 4Cr5MoSiV1 steel is dealt with by QPQ salt-bath nitriding at 520°C, 540°C, 560°C and for 2h、4h、6h, respectively. The treated surface microstructure was analyzed by using SEM. The depth of nitriding layer, scratch hardness and wear-resistance were tested for QPQ salt-bath nitriding technology. The corrosion resistance was tested in the 5%NaCl water by using spraying method. The experimental results indicate that with increasing the temperature and the nitriding time, the depth of nitriding layer, scratch hardness and wear-resistance of 4Cr5MoSiV1 steel were increased greatly. Comparing with the untreated specimen, its hardness enhances 196.73%, wear resistance enhances 349.65%, anti-corrosion enhances 943.10%. The die hardness, wear resistance and the corrosion resistance can be greatly improved by using the QPQ salt-bath nitriding technology.
Design and Simulation of Micro-Displacement Magnification Mechanism Based on Flexible Hinges
Authors: Zhou Shang Hui , Zhang Zhi Xiong , Shang Jian Zhong , Cao Yu Jun
Published: November 2010

A kind of triple micro-displacement magnification mechanism was designed according to the magnification principle of lever. Introduced the magnifying principle of the mechanism, analyzed the magnify ability and the relation between magnification times and exterior load, deduced the calculational equation of precise magnification times pass the analyes of stress, and used the Abqus to carry on finite element simulation. The result of simulation indicates that there existed certain difference between the value of theoretical computation and finite element simulation, the value of finite element simulation is less than theoretical computation, and the D-value enlarges along with the enlarge of exterior load. There are linear relationgship between magnification times and exterior load.
Tribological Properties of the Surface Bonded Self-Lubricating Coating
Authors: Yin Yan Guo , Lin Fu Dong , Yao Wei , Xie Ting , Yu Jian Wei
Published: November 2010

In order to investigate the effect of load and sliding speed on the tribological performance of epoxy bonded self-lubricating coatings on the metallic surface, a series of wear tests of the coatings containing MoS2 and graphite under dry friction conditions were carried out with different loads and speeds. The results showed that the appropriate load and speed are favorable to the formation of the solid lubricating film on the coating surface and the transfer film on the counterface, which make the coatings have better self-lubricating performance and the friction counterparts run steadily. The load carrying capacity of the surface adhesive self-lubricating coatings decreases as the sliding speed increases.
Joining of Cu/Fe by Pulse Current Heating
Authors: He Dai Hua , Fu Zheng Yi , Wang Wei Min , Wang Hao
Published: November 2010

Pulse Current Heating (PCH) process is a new method characteristic with shorter time and lower temperature to the fabrication of materials. In the present paper, the PCH was used to join Cu/Fe. The microstructures of the joined samples were observed by optical microscope, the diffusions of elements near the interfaces were made qualitative and quantitative analyses by Electron Probe Mechanism. Diffusion coefficients of Cu and Fe at PCH and Radiation Heating (RH) joining methods were compared. The results showed that, the transition layer widths were from 5 to 8 μm when the Cu/Fe joined at 750 to 850°C under 5 MPa pressure with holding times 5 or 10 or 15min. Width of the transition layer increase with the increasing of joining temperature and the extension of holding time. The initial interface will move from the Cu side to the Fe one due to the Kirkendall effect. The diffusion coefficients both of Cu and Fe to PCH joining were larger by three orders of magnitude than those of RH joining. The differences between the two methods were analyzed from dynamics and thermodynamics.
Nanoindentation Test for the Stiffness Distribution Analysis of Bonded Au Ball Bonds
Authors: Othman Norinsan Kamil , Zulkifli Mohd Nubli , Jalar Azman , Abdullah Shahrum
Published: November 2010

The Reduced Modulus value for the bonded Au ball bond that have undergone three different time intervals of high temperature storage (HTS) have been obtained by using nanoindentation test. Twelve indentations have been made at three different locations (Au, IMC and Si area) across the bonded ball bonds to evaluate the variation of Reduced Modulus with the location of indentation. It was shown that the Reduced Modulus value for the indentations at IMC area is increased with the increment of HTS time interval. It was also observed that the Reduced Modulus at the Au area was increased with the increment of the HTS exposure time. No particular pattern was noted to describe the changes of Reduced Modulus with the location of the indentations that have been made. It was also found that the average Reduced Modulus for Au obtained through nanoindentation with value of 107 GPa has higher value compared to that of the Young’s modulus value obtained through actual tensile test with value of 79 GPa.
Effect of Laser Welding Quality of Nuclear Reactor Coolant Pump Can on Eddy Current Losses
Authors: Jiang Li Jia , Guo Yu Quan , Ma Guang Yi , Wu Dong Jiang
Published: November 2010

The Nd:YAG laser welding experiments of Hastelloy C-276 was presented and the results of experiments were discussed which reflect the rise of electric resistivity of the sample. In addition, a mathematic model of 2-D nonlinear eddy current field for motor of the nuclear reactor coolant pump with the Hastelloy C-276 can was simulated which provides the concrete effect of electric resistivity change on the eddy current losses of cans. It was found that the eddy current losses of the motor can were decreased as the increase of electric resistivity of can. Then, the advantage of laser welding on the molding of motor can was discussed which not only does not destroy the electric performance of Hastelloy C-276 but enhances it and declines the eddy current losses of can forming with it.
Energy Saving Drive for Forming Equipments
Authors: Sun You Song , Hu Jian Guo , Zheng Hong Bo , He Ji Ping , Fang Ya , Ruan Wei Ping
Published: November 2010

Energy saving in manufacturing is the key to reduce energy consumption of unit GDP. Forming equipments are one of the biggest energy consumers. The basic reason of high energy consumption and low efficiency for current forming equipments is the mismatch between uncontrollable driving characteristics and the variable loads in forming processes. Complex transmission and control mechanisms are needed, wasting a lot of energy. The basic principles of driving were put forward to realize energy saving for forming equipments: faster in virtual strokes, slower in working strokes, stop when idling and recycling excessive energy. The servo driving based on large AC servo motors can make the driving and forming loads match each other well, realizing not only high automation and intelligence, but energy saving greatly as well. Theoretical analysis and experiments showed that by adopting AC servo driving the crank presses, hydraulic presses and screw presses could get the energy saving results of 25-70%.
Structure and Abrasion Resistance of MoS2/TiN Composite Coating on Ti-6Al-4V Alloy
Authors: Wang Li Jie , Tian Xiao Dong , Yang Jun Sheng
Published: November 2010

The MoS2/TiN composite coating was prepared on Ti-6Al-4V by the combination of plasma diffusion and magnetron sputtering techniques. The microstructure and phase constituents of the composite coating were analyzed by scanning electron microscopy(SEM) and X-ray diffraction(XRD). The abrasion resistance of the composite coating was examined on MM-200 abrasion tester. The results revealed that the composite coating consisted of MoS2, Mo, TiN and Ti phases, and its abrasion resistance was excellent under dry friction and absolute sliding.
Study on the Joint of Isothermal Superplastic Solid State Welding between Cr12MoV Steel and 40Cr Steel after Laser Surface Quenching
Authors: Shi Hong Xin , Wu Zhi Wei , Sun Jing , Yu Hua , Qiu Ran Feng , Zhang Ke Ke
Published: November 2010

The 40Cr steel surface waiting for being welded was ultra-fined through laser quenching, and isothermal superplastic solid state welding was conducted between the 40Cr steel and Cr12MoV steel. The mechanical properties of the joint were evaluated by tensile testing and microhardness of the joint and thereby. The microstructure of 40Cr steel’s quenching layer and the joint interface zone was observed and analyzed using scan electron microscope. The experimental results show that ultra-fine microstructure is achieved in the 40Cr steel’s surface waiting for being welded. The superplastic solid state welding can be carried out under welding parameters including welding temperature of 800 , pressure welding time of 4 min and initial strain rate of 1.5×10-4 S-1. The tensile strength of joint achieves 81.94% that of 40Cr steel. The microhardness of transition region in the Cr12MoV side is higher than other region. On the contrary, the microhardness in the 40Cr side is lower than other region. The new M7C3 type carbide is checked in the Cr12MoV side. In welding process, the carbon atom has diffused from 40Cr steel side to Cr12MoV steel side. Therefore, isothermal superplastic solid state welding with higher quality can be realized between Cr12MoV steel and the 40Cr steel after microstructure ultra-fining through laser quenching.
Research of 3D Design on Punching Dies of Automobile Panel
Authors: Guo Xiu Li , Lu Huai Min , Guo Xiu Rong
Published: November 2010

The 3D design technology of the punching die of the automobile panel is discussed, and the basic thinking of the 3D die design based on UG surrounding is introduced. The parallel idea combined the 3D parameterized model with the 3D design of the die is presented. Every kind of resource library of the die design and its application are also introduced in this paper. Furthermore, the matters needing attention in the punching die design of the automobile panel are put forward in order to improve the efficiency and quality of the die design.
Effect of Bottom Structure of Submerged Entry Nozzle on Flow Field in Ultra-Thick Slab Continuous Casting Mold
Authors: Xie Xin , Chen Deng Fu , Liu Qiang , Shen Jia Long , Peng Zheng , Dong Zhi Hua , Zhang Lei Lei , Zhang Min
Published: November 2010

Submerged entry nozzle (SEN) bottom structure plays an important role in determining the flow pattern in continuous casting process. This work applies a water model to evaluate the pointed-bottom, flat-bottom and recessed-bottom nozzle performance in ultra-thick slab mold. The jet properties and surface flow are compared for the three kinds of nozzles quantitatively. The results show that flat-bottom and recessed-bottom nozzles are similar in flow pattern, but the pointed-bottom nozzle has smaller jet angle, thinner flow pattern, larger surface asymmetry rate, and higher surface flow intensity.
Spot Weldability Comparison of High Strength Steel BIF340 and Normal Cold-Rolled Steel St14
Authors: Liu Hui , Yu Yan , He Jun Jing
Published: November 2010

The experimental investigation was carried out to compare resistance spot weldability of BIF340 and St14 steel in different weld processes.The spot weld microstructure and properties of two steels were analyzed.The results shown that : resistance spot weldability of BIF340 is better than St14.The optimum parameters of BIF340 were as follows: welding current was 6KA,welding time was 7 cycles, electrode force was 2800N. With the same welding process parameters, the microstructure of BIF340 spot weld was homogeneous and fine-grained, and the tensile shear strength was higher than St14.
Investigation of Surface Roughness Prediction in Single-Point Diamond Turning
Authors: Zhao Qing Liang , Chen Jun Yun , Luo Jian
Published: November 2010

Experimental results indicate the previous theoretical model cannot predict well the surface roughness in single-point diamond turning on a precision lathe. In solving that, an improved model was presented in this paper. The difference between the previous model and the improved model is that the relative tool-workpiece vibration is measured before cutting operation using a capacitive displacement sensor in the previous model whilst the vibration is extracted from the measured surface profile in the improved model. The relative vibration was first studied under various cutting conditions to establish the vibration modes under corresponding cutting conditions. Then the surface roughness was predicted based on the vibration modes. The results prove that there is good agreement between the predicted values and measured values and the improved model is useful and reliable.
The Effect of Filler Metals on Mechanical Properties of 6 Mm AA 6061-T6 Welded Joints
Authors: Othman Norinsan Kamil , Bakar S.R.S. , Jalar Azman , Syarif Junaidi , Ahmad M.Y.
Published: November 2010

The purpose of this study is to evaluate the effect of filler metals in the gas metal arc welding (GMAW) process on the Aluminium alloy of AA 6061-T6 welded joints. 6 mm thickness plate with single V butt configuration was used and welded using two different fillers ER 4043 and ER 5356 and controlled welding parameters. The relationship between hardness and microstructure of the welded parts were studied and compared and the results showed that the post weld mechanical property has decreased especially for the filler ER 5356. The hardness at the heat affected zone (HAZ) of ER 5356 also has reduced almost 85% compared to the hardness of AA 6061 base metal. The microstructure of ER 4043 welding material shows the shape of columnar grains and dendrite structure. Microstructure morphology of ER 5356 welding material shows dendrites and intermetallic particles (Mg2Si) have partially dissolved and scattered in the welding material.
The Experimental Research of the Non-Abrasive Cryogenic Polishing on GaAs Chip Surfaces
Authors: Qu Shou Ping , Zhang Zhong Shu , Liang Tian Zhu
Published: November 2010

With the development of mobile communications, gallium arsenide integrated circuits (GaAs IC) have been widely used. For example, satellite communication technology, satellite TV, wireless data transmission, fiber optic communications equipment, automatic test equipment etc. At the same time, it demands that the GaAs chips should have high quality surfaces. In this paper, it takes non-abrasive cryogenic polishing technique to polish GaAs chip surfaces. It has recorded the actual measurement results. The results show that the surface roughness of the ice disk polishing can achieve nanometer scale. Through the research of non-abrasive cryogenic polishing, it has analyzed different parameters on the impact of surface quality.
Characterization and Joining Behavior of Glass-to-KOVAR Alloy Fiber Laser Joint
Authors: Tu Ye , Ji Ling Fei , Bao Yong , Jiang Yi Jian
Published: November 2010

This study investigates on the characterization and joining behavior between glass and KOVAR alloy with fiber laser. Due to the different chemic bonds and thermal expansion coefficients, the oxide layer plays an essential role in this process. First, surface treatments under different conditions have been discussed. It’s indicated that when the two textures (the square block and the strip phase) appeared on the KOVAR surface, the joinability of KOVAR alloy enhanced. Then, considering about three laser process parameters (beam scan speed, laser power and focus position) by the orthogonal experimentation, the result indicated that the possibility of this joining technology. Finally, the fractures graphs were observed by LEXT OSL 3000. By analyzing the FeO-SiO2-Fe phase diagram and XRD on the fractures, it displayed that a new chemical substances (Fe2SiO4) had formed which was considered as the key-materials for a good glass-to-KOVAR alloy joint.
Effects of MgO Addition Level on Microstructure and Wear Resistance of Ni-WC Vacuum Fusion Sintering Coating
Authors: Wang Ya Nan , Han Li Ying , Wang Xiao Da
Published: November 2010

Ni-WC-MgO compound coatings were made by way of Vacuum Fusion Sintering (VFS). Effects of MgO addition level on the microstructures of coating surface and longitudinal section, element diffusion in fusion sintering area and wear resistance were analyzed through scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). The results showed as the following: MgO addition made coating and matrix combined closely; there existed obvious transition region. When the addition level of MgO was 0.5%, the coating had the fewest defects and best combination. Ni, Cr, W, C and other elements in the coating diffused to the direction of the base metal while Fe in the base metal diffused to the coating, during which the diffusion of Fe and Ni was most obvious at the junction. Therefore, when the addition level of MgO was 0.5%, the surface microstructure of the coating was the densest and finest, and the wear resistance of the coating was the best.
Finite Element Analysis of Molten Pool Depth and Dilution Rate in Laser Clad TiC/NiCrBSiC Coatings on Ti6Al4V
Authors: Lei Yi Wen , Gong Cheng Qiang , Sun Rong Lu
Published: November 2010

A three-dimensional model was proposed to simulate high power laser clad TiC/NiCrBSiC composite coatings on Ti6Al4V alloys. Molten pool depth and dilution rate were obtained and compared with the experimental results. The calculated molten pool depth in the sample is about 0.76 mm and dilution rate is 21 %. The experimental data molten pool depth and dilution rate were 0.81 mm and 26%, respectively. There is a good agreement between the numerical and experimental results. A good quality laser clad TiC/NiCrBSiC coating with low dilution rate and excellent metallurgical bond can be prepared under the optimal parameters.
Development of the Online Control Model for Aluminum Ingot Tapered Cooling
Authors: Song Yong , Li Jing Yuan , Lin Feng Qin , Hu Shui Ping , Yang Guang Tu
Published: November 2010

In the present work, a two-dimensional finite difference model is built to realize the online control of the aluminum ingot tapered cooling process. The temperature evolution of aluminum ingot in the tapered cooling process is analyzed. According to the feature of the tapered cooling process, an efficient and simple algorithm of cooling time is developed. Online application shows that the efficiency and the accuracy of the control model can meet the production requirements.
Computer Simulation of Melt Flow in Different Gate System for Metal Injection Molding Connecting Shaft
Authors: Jin Jie , Ning Fang Yan
Published: November 2010

On the basis of continuous medium theory, computer simulation analysis of metal-powder injection molding was carried out with the help of FLOTRAN hydro-analysis module of ANSYS software. The effects of the gates with different dimension and location were testified. The impact of gate system on the filling process is discussed. The dynamic display of the flow leading edge in the cavity, and temperature field of the melt were researched. A result was obtained that we can modify the design of runner system if we make a full use of existing equipment resource.
Size Prediction Control Modeling in Cylindrical Grinding
Authors: Ding Ning , Ma Shi Qiang , Song Yu Mei , Wang Long Shan
Published: November 2010

A dynamic size control model during cylindrical grinding is built. The model consists of Elman neural network, fuzzy control subsystem and deformation optimal adaptive control subsystem. To improve the size prediction accuracy, the first and the second derivative of the actual amount removed from the workpiece are added into the Elman network input; To self-adapt and adjust the quantification factor and scale factor in the fuzzy control, the flexible factor is introduced to the fuzzy control model. Simulation and experiment verify that the developed prediction control model is feasible and has high prediction and control precision.
A Novel Method for Quantitative Analysis of Tetragonal Phase in Barium Titanate Powders by X-Ray Diffraction
Authors: Pu Yong Ping , Xu Ning , Chen Xiao Long
Published: November 2010

Quantitative analysis of tetragonal phase in barium titanate powders and fundament of standard curve was discussed from the result of X-ray diffraction (XRD) experiment via testing the standard series prepared powder samples. Some different conclusions compared with the past researches were drawn by analyzing the XRD data including the integrated intensity of a certain diffraction peak, difference in 2θ between peak (002) and (200) △2θ and d (interplanar spacing) value. Thus a useful method was provided for quantitative analysis tetragonal phase in barium titanate powders by synthesized by hydrothermal method.
Effect of a Furniture Interior Air Purifying Device on Reducing Concentrations of Formaldehyde in Air
Authors: Li Sha , Jin Lan , Liu Shu Sen
Published: November 2010

Effect of a furniture interior air purifying device on reducing concentrations of formaldehyde in air
Research on Removal of Boron from Metallurgical Grade Silicon by Si-Al Alloying
Authors: Liu Yu , Lu Dong Liang , Hu Yu Yan , Lin Tao , Sun Yan Hui , Chen Hong Yu , Li Qian Shu
Published: November 2010

A low-cost process for removing boron from metallurgical grade silicon was developed by Si-Al alloying, and the separation procedure of silicon grains from Si-Al melt by solidification was investigated in this paper. The microstructure and purity of silicon were characterized and detected by metallographic analysis, energy dispersive X-ray spectrometers analysis and inductive coupled plasma atomic emission spectroscopy analysis. The results showed that the content of boron in the purified silicon decreased from 128.00 ppmw to 27.62 ppmw. In addition, the process of purification with Si-Al alloying combined with the treatment of hydrofluoric acid could remove boron to a low content of 13.81 ppmw, the removal rate of which is 89.21 %. The results indicated that the removal of boron from metallurgical grade silicon by Si-Al alloying is an efficient and prospective method.
Study on the Reaction Process of Ploy-High-Ferric-Silicic Coagulant
Authors: Yu Yan Zhen , Tan Juan , Sun Yong
Published: November 2010

A new inorganic polymer coagulant，ploy-high-ferric-silicic coagulant with various Si/FeO42- ratios and salt-basicity, was prepared using the fly ash extract and potassium ferrate. The influence of both Si/FeO42- ratios and salt-basicity on the complexation process was explored with many analytical methods, such as transmission electron microscope (TEM), lased particle size analysis (LPSA) and infrared spectrum (IR). The results show that the ploy-high-ferric-silicic is a complexation compound, instead of a simple mixture of raw materials. The complexation process between Si and Fe may be different from various Si/FeO42- ratios and salt-basicity. The bonding can help revealing the high-ferric groups function in synthesis process. From analyzing the different ferrosilicon bonding modes, it can provide some theoretical basis to compound high-ferric coagulant.
Study on the Composites of Phenol Formaldehyde Resin/Graphite Reinforced by Milled Carbon Fibers for Bipolar Plates
Authors: Wang Wei Qiang , Li Ai Ju , You Ming Ming , Xia Bin
Published: November 2010

Composites of phenol formaldehyde (PF) resin/graphite reinforced by milled carbon fibers (MCFs) for bipolar plates are obtained by hot compression molding. The raw materials of the MCF particles, PF resin powder and graphite powder are simply dry powder ball milled and mixed. The effects of PF resin content and the content, granularity and surface treatment methods, such as air oxidation and Fenton/ultraviolet (UV) liquid-phase oxidation of MCFs on the electrical conductivity and flexural strength of the composites are measured by methods of four-point probe technique and three point flexural test, and the fracture patterns of the composites are analyzed by scanning electron microscope (SEM). The results indicate that the electrical conductivity decreases and flexural strength increases with the increase of PF resin content. Especially, the values of electrical conductivity and flexural strength can reach 165.28 S.cm-1 and 55.11MPa respectively when the PF resin content was 17% in weight. The properties of composites reinforced by air oxidation treated MCFs are better than those by liquid-phase oxidation treated one. The electrical conductivity and flexural strength of the composites are 208.12S.cm-1 and 57.44 MPa when they reinforced by 5% MCFs which treated by air oxidation at 450 . Compared with the nonreinfoced composites, the properties of reinforced composites increase 25.92% in electrical conductivity and 4.23% in flexural strength.
Study on Magnetic Field and Free Boundary of Magnetic Fluid Seal
Authors: Fan Yu Guang , Chen Fang Yu , Chen Bing
Published: November 2010

Magnetic fluid was invested in 20thcn 60s, and nowadays, it is used as an effective way for mechanical seal. This paper follows the seal requirements of stirred reactor rotating axis, analyzes the applicability for its seal condition. Meanwhile, in this paper the magnetic field is calculated by numerical simulation, the free boundary of magnetic fluid is analyzed in conditions of static seal and dynamic seal. The boundary analysis for magnetic fluid seal can directly show its position, when the boundary of magnetic fluid moves to the lower extreme of pole teeth, it can be considered the seal is invalid. This is a simple way to supervise the magnetic fluid seal.
Property Analysis of Solid-Adsorption Desiccant System
Authors: Chen Huan , Li Wei , Xu Qiu Yu , Cai Wei Li
Published: November 2010

Based on the concept of independent dehumidification, a system which can test the dehydration property of both the adsorbent bed and the adsorbent has been designed. As the adsorbent, the activated alumina and the 4A molecular sieve are used to test the dehydration property of the whole adsorbent bed with two kinds of adsorbent. Finally, three new evaluation indexes about the dehumidification efficiency based on the experimental data are proposed in this paper.
Finite Element Analysis of Temperature Characteristicon the Pressure Sensor Based on the Shell of Piezo Gauge
Authors: Li Xin E. , Zu Jing , Xu Peng
Published: November 2010

When the gun chamber pressure is tested, its instantaneous high temperature up to 3000 , Sensor directly touches the high temperature gas. According to this special use environment, A novel method is proposed in this paper: the thermal barrier coating (TBC) is added to protect the sensor against its thermal deformity. And temperature characteristics of the sensor with TBC are analyzed through finite element. finally, its temperature characteristics were experimentally tested. Results show that the thermal barrier coating plaied heat insulation role, temperature stability of the sensor is good.
The Establishment of Wave Model in Qingdao Fushan Bay
Authors: Li Shui Yu
Published: November 2010

A wave model in Qingdao Fushan Bay is established in the paper. The effect of the variety of terrain, dredging in the basin, the shelter of the structure, the reflection of the piers and breakwaters are taken into account. Rectangular grid is applied in the calculation. For reducing the errors and ensuring the precision, normally incident waves and completely-absorbed boundary conditions are considered in the calculation. The result gives the wave height at each point in different water levels, and wave directions of 50-years return period, which provides a basis for the shoreline structure of wave energy generation planning and designing.
Finite Element Analysis of Pressure Device in Die-Cutting Based on the ANSYS Workbench
Authors: Shen Shao Hua , Shi Xiang Dong
Published: November 2010

The important component--- pressure device in die-cutting is analyzed by Solidworks and ANSYS Workbench. With analyzing the structure of the pressure device, some simplification is made, and the tool of draft mirror and feature mirror is often used in building the model in the Solidworks. Loads of the pressure device in different load conditions are analyzed and calculated. Stress and displacement of the pressure device are plotted after static finite element analysis. Its stress is analyzed by ANSYS. Stress and strain distribution is found. Which can provides mechanical simulation for the design of the pressure device, and provides scientific basis for selecting structure type, deciding structural parameters, increasing static and dynamic properties, reducing manufacture cost of the integral body of the pressure device.
Characterization of Coconut Shell Activated Carbon Obtained from By-Product of Preparation Process of Bio-Oil with Fast Pyrolysis
Authors: Xie Qing Ruo , Tong Zhang Fa , Zheng Li Wen , Chen Xiao Guang
Published: November 2010

A new process was investigated which combines both fast pyrolysis carbonization and CS activated carbons with H3PO4 activation (CSAC). ACs were obtained as by-product from the preparation process of bio-oil with fast pyrolysis under different temperatures (T=727–973 K), in which the reaction ended in a very short duration. A two-step process of reaction is proposed to govern carbonization and activation: firstly fast pyrolysis reaction removing disorganized material was associated with considerable weight loss but with low generation of porosity, pyrolysis/carbonization under the flow of N2 is suggested to ensure fluidization of CS powders and bed material, enhance decomposition of raw material, initiates controlled gasification at different temperatures. Then H3PO4 activation process dominated at 573 K, which leads to considerable evolution of porosity. In this research, the adsorption characteristics were determined from N2 adsorption isotherms and subsequent analysised by the BET-and BJH-methods. As a result, the iodine adsorption number of AC was 1310 mg/g and the SSA of AC was 1421.38 m2/g .
Preparation and Performance of Single Walled Carbon Nanotubes Supported Anode Catalysts (20%Pt-10%Ru) of Direct Methanol Fuel Cell
Authors: Jiang Bo Quan , Gong Zhen Yu , Wang Min Wei
Published: November 2010

The platinum (20% in mass) and ruthenium(10% in mass) catalysts supported on single-walled carbon nanotubes (SWCNTs) were prepared by liquid reduction method. The optimum technical conditions for purifying the SWCNTs were experimentally selected to be: nitric acid concentration of 4M, reaction temperature of 103°C and reaction time of 12 h. The optimum technical conditions for preparing 20%Pt-10%Ru/SWCNTs were determined to be: H2PtCl6–RuCl3 concentrations of 0.005 g·cm-3– 0.005 g·cm-3 and temperature of 60 with the purified SWCNTs as carrier. Under the optimum preparation conditions, the synthesized 20%Pt-10%Ru/ SWCNTs has smaller average catalyst particle diameter(d), larger specific surface area(α) and higher power density(P) (d=2.1nm, α=136.31 m2·g-1 and P=117.1 mW·cm-2·g-1) than 20%Pt-10%Ru/C (JM) ( d=2.4nm, α=119.27 m2·g-1 and P=75mW·cm-2·g-1 ), 20%Pt-10%Ru/MWCNTs ( d=3.0nm, α=95.42 m2·g-1 and P=67mW·cm-2·g-1) and 20%Pt-10%Ru/C (d=3.1nm, α=92.34 m2·g-1 and P=63mW·cm-2·g-1), respectively.
Study on Tool Path Algorithm for Mushroom Blade Boot in 4_Axis Machining
Authors: Zhou Kui , Yu Si Tu , Xiao Shi De
Published: November 2010

According to the motion characteristics of 4-axis CNC machine tool, this paper studies a new way for manufacturing the mushroom turbine blade boot .It must rotate the turbine blade to ensure the tool axis consistent with the normal of the interpolating point on the arc of the blade boot, and move the tool to keep the cutting point in contact with the interpolating point. Meanwhile, this paper researches an algorithm to calculate the tool path in the MCS, According to this algorithm, a program with R variable parameter for manufacturing the mushroom turbine blade boot is provided.
Parametric Design on Belt Conveyor Drums Based on VBA
Authors: Leng Yue Feng , Liu Jia , Zu Feng
Published: November 2010

As an example to belt conveyor drums, this article introduces a parametric drawing method. The method uses inlays language VBA to secondary develop AutoCAD and achieves the design process of components through the procedure. The parametric design method reduces the designer’s duplicated drawing works which carried on to some kinds of components, and enhances the drawing quality and efficiency.
Analysis of Crown Control Characteristics for SmartCrown Work Roll
Authors: Li Hong Bo , Zhang Jie , Cao Jian Guo , Meng Li Li
Published: November 2010

SmartCrown work roll contour has been brought in China for several years, but the research of crown control characteristics of SmartCrown work roll is lacking, especially the relationship and difference between SmartCrown and CVC work rolls. The paper researched the principle and design method of SmartCrown work roll contour first, and then the relation and difference between the SmartCrown and CVC work roll contours were pointed out, the crown control ability of different strip width was discussed too. From the analysis and research, it can be concluded that the contour angle of SmartCrown work roll contour is the most key factor for its crown control characteristics.
Discussing the Green Design for Belt Conveyor
Authors: Guo Yong Cun , Wang Zhu Fen , Hu Kun
Published: November 2010

Green design is a new design method which is proposed under the situation of energy shortage and environmental pollution. Based on the theoretical foundation of green design, it can be done to design the conveyor belt that is as one of the most important continuous transport machinery. And it can be used to satisfy the request to save natural resources and protect the environment in the meet the premise of work requirements.
System Development of the Service Robot
Authors: Chen Limin , Zhu Jiang
Published: November 2010

The robot control by PC through the wireless communication between the PC and the single-chip microcomputer not only expands the functions of the PC, but also creates more functions of the indoor service robot. Therefore utilization of the wireless communication between the PC and the robot can make full use of resources and improve the efficiency. The hardware of the indoor service robot includes the hardware of the robot control system and the hardware of the PC monitor system. The software of the indoor service robot consists of the software of the PC control software and the single-chip microcomputer control software. Therefore, the robot can autonomously walk along the track or walk under the manual control even when the robot is a long distance away.
Photochromic Fabric of WO3 and its Anti-UV Properties
Authors: Du Wen Qin , Su Qi Lai
Published: November 2010

The color of samples changed after illumination in the light from a high pressure mercury lamp, when depositing WO3 thin film on polyester fabrics by magnetron sputtering. indicate that the fabric has discolour properties. Placed in dark room for some time, the samples recovered to pre-illumination color, show that the reaction is photochromic.
Development and Utilization of Database on Corrosion of Ocean Engineering Materials and Structures
Authors: Li Zheng , Yao Lei Jiang , Tong Xiao Yan
Published: November 2010

Corrosion of ocean engineering structures leads huge economic loses each year. Corrosion protection technology has already become a very important method for design and manufacture of ocean engineering structures. To decrease corrosive loses and guarantee the safety of engineering structures, extensive studies are invested to understand corrosion mechanisms and rules of engineering materials, and to develop technologies on corrosion control and protection. These research projects have produced and are producing a great amount of test data, reports, products, experiences, and so on. If all these data resources can be collected and organized in a unified platform, it will take great advantages for products design or manufacture on corrosion protection. A database, named Database on Corrosion of Ocean Engineering Materials and Structures (CDOSDB), was planned. For a designer or manufacturer, it should be considered in serving environment, corrosion property of material, methods on corrosion protection, and experiences on protection of real engineering structures. So, the CDOSDB is mainly include ocean environmental information, test data in real sea, simulating test data in lab, methods and products on corrosion protection, survey on corrosion status and protection of real engineering structures, corrosion knowledge and corrosion models. Because the related data and information were collecting from different research institutes and publications, in order to make full use of them, a uniform specification are arranged and standardized. A website is designed and the web addresses is http://www.dematers.com. It makes the database sharable.
Searching of Critical Slip Surface of Slope Based on Bionics Algorithm
Authors: Gao Wei , Zhang Lu Yu
Published: November 2010

The landslides from the instability of slopes are very serious geological hazards. The one key issue to compute the slope stability is the searching of critical slip surface. Generally, the searching of critical slip surface is a very typical complicated continuous optimization problem. To solve this problem very well, firstly, combing the artificial immune system algorithm and evolutionary algorithm with continuous ant colony algorithm, one new bionics algorithm for continuous function optimization which is called immunized continuous ant colony algorithm is proposed, secondly, combing new algorithm with limit equilibrium analysis, one new global optimization algorithm for critical slip surface searching is proposed. At last, through a typical numerical example-ACADS example, this new method is verified. The results show that, using the new algorithm, the searched slip surface will be coincided with the measured slip surface very well, and the stability safety factor will also be agree with the actual situation.
Preparation of Activated Carbon from Blue Coke Powder and its Adsorption Properties of Cr(VI)
Authors: Tian Yu Hong , Lan Xin Zhe , Li Lin Bo , Chen Xiang Yang , Hu Tang Hua
Published: November 2010

Activated carbon was prepared from blue coke powder by physical activation. The results show that the specific surface area (BET) is 697.05m2/g, the total pore volume is 0.4569cm3/g and the average pore size is 2.6221nm. The adsorption properties of Cr( ) onto blue coke powder activated carbon are discussed from the kinetics and thermodynamics viewpoints. The pseudo-second-order kinetic model shows the best correlation with experimental data. Langmuir and Freundlich models are used to fit the equilibrium, and it is indicated that Freundlich best fits these data. The adsorption of Cr( ) onto blue coke powder activated carbon is found to be an endothermic process in nature.
Study on Modelling Random Deterioration Process for Complex Repairable System
Authors: Zhang Hai Jun , Zuo Hong Fu , Zhu Si Hong
Published: November 2010

Traditional probability statistics theory is impossible to obtain failure lifetime data by accelerated test for expensive and complex systems or equipments for real-time work. Due to the variety of system failure modes and the randomness of system deterioration process and the fuzziness of system maintenance threshold, it is difficult to estimate the random deterioration process of a complex repairable system by single parameter. In order to describe system performance deterioration more subjectly, it proposes generalized proportional intensity model(GPIM). considering the effects of various covariates such as performance parameters, environment stress, failure types and maintenance history simultaneously. This method provides a new method to solve the maintenance decision-making problem of complex repairable system. CF6-80C2A5 aero-engine is illustrated as an example for case study to indicate the obvious practical value by the method proposed herein.
Analysis of Dynamic Characteristic of Numerical Remanufacture Machine's Feeding System
Authors: Pu Qiu Lin , Huang Xiao Diao , Ding Wen Zheng
Published: November 2010

In this paper,the ball screw feeding system’s dynamic characteristics of a numerical remanufacture grinding machine is analyzed using the FEM. Discusses the modeling method of ball screw system into the finite element model and established the combination of finite element model. Through the modal analysis and the harmonious response analysis, the nature frequency and vibration mode of the feeding system and typical operating conditions of excitation in the harmonic responsehave have been gotten,thus the dependable basis for the construction’s optimization and dynamic function’s increasing of the feeding system is provided, ensure the numerical remanufacture will be success.
Contribution of Phenolics and Flavonoids to Anti-Oxidat Activity and of Ethanol Extract from Eichharnia crassipes
Authors: Liu Cheng Chu , Zhao Guo Ling , Li Ya Ning , Ding Zhuo Ping , Liu Qi Gen , Li Jia Le
Published: November 2010

The polyphenol and flavonoid contents and antioxidation capabilities, including total reducing power, DPPH radical scavenging capability and lipid peroxidation inhibition, of ethanol extracts of water hyacinth (Eichhomia crassipes) were investigated and compared with those extracted from red tide seaweed (Enteromorpha prolifera) and from the most common seaweed (Porphyra haitanensis). Results showed that E. crassipes contained higher amounts of polyphenols [6.68 mg gallic acid equivalents (GAE)/g] in the leaf than in the stem (4.37 mg GAE/g) or in P. haitanensis (4.27 mg GAE/g). The E. crassipes also contained higher contents of flavonoids [1524 and 453 mg rutin equivalents (RE)/g in leaf and stem, respectively] than did E. prolifera (233 mg RE/g). Accordingly, both the leaf and stem of E. crassipes had relatively higher reducing power [118.35 and 47.21 100μg ascorbic acid equivalents (AscAE)/g, respectively] and DPPH radical scavenging capability (74.6% for leaf and 62.7% for stem) when compared with E. prolifera (reducing power of 16.5 and DPPH radical scavenging capability of 42.96%). Statistical analysis showed that the antioxidation capabilities, especially reducing power, of extracts of the three aquatic plants were positively correlated with their total polyphenol contents, but not with the contents of flavonoids. The correlation coefficient (r) of the content of polyphenols and reducing power of those extracts was r=0.9028, that for DPPH scavenging and lipid peroxidation inhibition was r=0.9311 and 0.9099, respectively. These results indicated that phenolic compounds are the main compounds contributing to the antioxidation activities of seaweed extracts. E. crassipes can be a source for extracting natural antioxidants.
A Laser-Imageable Thermo-Sensitive Film Based on Tertiary Amine Oxide-Containing Resin
Authors: Li Zhong Xiao , Fan Wu Kun , Pu Jia Ling
Published: November 2010

A modified phenolic resin containing tertiary amine oxide was prepared via a two-step method. Epoxy phenolic resin, F-48, was reacted with dimethylamine to give the phenolic resin containing the tertiary amine group, which was then oxidized with hydrogen peroxide to obtain the target product. The tertiary amine oxide-containing resin could easily dissolve in water. However, it became water insoluble after heat treatment at a high temperature such as 160 °C. Thermal properties of the tertiary amine oxide resin were studied with DSC and TGA. A thermo-sensitive film comprising the prepared resin and an IR-dye was prepared and laser-induced thermal imaging was also conducted. This material might be used to develop new chemistry-free printing plates.