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作者： Xiuxu, Zhao Zude, Zhou Gangqin, Shao School of Mechanical and Electrical Engineering Wuhan University of Technology Wuhan Hubei 430070 China State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan Hubei 430070 China

The 5-axis milling processes were conducted with several uncoated WC-Co tools, which are with taper ball end mills with four flutes. There is a severe problem of high rate of tool failure, which has led to the high cost and low productivity of the milling process. In order to find out the real reason, some former work, which included the tool geometry analysis, tool path and tool posture analysis, as well as the cutting force calculating, had been done. It has been found that most of the tool failures are resulted from cutting edge chipping or the workpiece material of titanium alloys attached to the tool, Meanwhile, a suddenly applied load or an abrupt unloading of the tool at the end of a cut is another important factor. Moreover, the tool materials had been analyzed, which included the element composition analysis with XRD, the microstructure analysis with SEM. XRD results indicate the cobalt at the tip of tool is less than at the shank of tool. SEM results indicate there are micro-cracks concentrated in the cutting edge area. The tool material failure mechanism will be set up based on the tool material analysis in this study.

关键词： Titanium alloys

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synthesis of Mg2Sn thermoelectric compound powder by solid state reaction at low temperature and process control

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Gongneng Cailiao/Journal of Functional materials 2008年第10期39卷 1649-1652页

作者： Luo, Wei-Jun Jiang, Hong-Yi Yang, Mei-Jun Shen, Qiang Zhang, Lian-Meng School of Material Science and Engineering Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

In order to reduce the oxidizing, volatilizing and carbonizing caused by Mg element in the traditional methods for synthesizing Mg2X (X=Si, Ge, Sn) compounds, solid state reaction at low temperature was introduced, DTA, XRD, SEM, and EDS were used to characterize the powders. At the same time, the influences of parameters during the synthesis processing were discussed. The results suggest that the oxidation of Mg can be restrained by changing heating programs, the separation of Sn can be controlled by adjusting pre-pressure, the volatility of Mg can be made up by controlling excessive content of Mg. When the excessive content of Mg is about 0.0025 mol, the pre-pressure is about 20 MPa, the samples is kept under 823 K for 8 h, high purity Mg2Sn powders can be obtained under this experimental conditions.

关键词： Binary alloys

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Combustion behavior and flame retardation mechanism of epoxy resins blended with basic magnesium carbonate

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Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2008年第4期30卷 19-22+102页

作者： Qin, Lin-Qing Liu, Yi-Bo Huang, Zhi-Xiong Zhang, Lian-Meng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Center for Material Research and Analysis Wuhan University of Technology Wuhan 430070 China School of Materials Science and Technology Wuhan University of Technology Wuhan 430070 China

In this paper the inflaming retarding effects of epoxy resins blended with basic magnesium carbonate [Mg(OH)2·4MgCO3·5H2O] were synthesized. When the add-on of basic magnesium carbonate reached 56.5%, the LOI of the epoxy resins increased to 29.7%. The flame retardant mechanisms of basic magnesium carbonate for epoxy resins was investigated by XRD, TG-DSC and SEM. Results showed that through the ways of diluting, cooling, isolating and their synergies, basic magnesium carbonate achieves the flame retarding target.

关键词： Basic magnesium carbonate Epoxy resin Flame retardation mechanism Inflaming behavior

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Preparation of Polycrystalline Singe-phase K0.3MoO3 by Hot Isostatic Pressing Sintering

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Journal of materials Science & technology 2007年第5期23卷 633-636页

作者： dunfeng WANG Rui XIONG Ning SHU Jing SHI Zhengzhong dIN Department of Physics Wuhan University Wuhan 430072 China School of Remote Sensing and Information Engineering Wuhan University Wuhan 430072 China International Center for Material Physics Shenyang 110016 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Nearly single-phase and polycrystalline charge-density-wave compound K0.3MoO3 have been prepared by using a simple method. In this work, K2CO3 and MoOs were used as starting materials and reacted by hot isostatic pressing （HIP） sintering. The product is nearly single phase K0.3MoO3 determined by X-ray powder diffraction （XRD） and energy dispersive spectroscopy （EDS）. Measurement of temperature dependence of resistivity reveals that the transport property of polycrystalline K0.3MoO3 obviously differs from that of single crystal due to the grain boundaries and the anisotropic structure in this kind of compound.

关键词： Blue bronze K0.3MoO3 Charge-density-wave Polycrystalline Hot isostaticpressing

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Influence of Particle Size and Thickness of material on Anti-voltage Strength of Energy-storage Composite

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MRS Online Proceedings Library 2007年第1期949卷 1-7页

作者： Luo, Dabing Guo, Yan Hua, Hao Liu, Hanxing Ouyang, Shixi State Key Laboratory of Advanced Technology for Materials¡¯ Synthesis and Processing Wuhan University of Technology Hubei People’s Republic of China Material College Wuhan university of Technology Wuhan Hubei People’s Republic of China State Key Laboratory of Advanced Technology for Materials¡¯ Synthesis and Processing Wuhan University of Techology Hubei People’s Republic of China

After combining the PVDF and BST powders with different particle sizes, the anti-voltage strengths of composites was tested. Although the concentrates of ceramic were all the same, their anti-voltage strengths were distinguished. The results showed that the bigger particles or less thickness of material could benefit to the anti-voltage strength and ultimately enhanced the energy storage density of composites. Moreover, the distribution of particle dimension also influenced the strengths of materials. Composite with homogeneous particles performed higher strength than that of composites with inhomogeneous particles.

关键词： energy-storage composite strength

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Finite element analysis of three dimensional transient stress in 300MW boiler drum

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Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of technology (Transportation Science and Engineering) 2007年第1期31卷 60-62+69页

作者： Yin, Qizhi Xiao, Jinsheng Jiang, Ailin Chen, Yiping Zhao, Zaili School of Energy and Power Engineering WUT Wuhan 430063 China School of Automobile Engineering WUT Wuhan 430070 China State Key Laboratory of Advanced Technology for Material Synthesis and Processing WUT Wuhan 430070 China Hunan Electric Power Test and Research Institute Changsha 410007 China

Taking the running parameters of boiler drum in 8 typical working conditions as data of boundary conditions, the transient thermal stress, mechanical stress and total stress of a 300MW boiler drum is calculated by finite element method. The results show that when the vapor pressure is close to or higher than the normal working vapor pressure, the temperature difference on the boiler wall has little influence on the total stresses. The vapor pressure in boiler drum is the main influential factor to the total stresses, and there is a proportion relationship between them. With the relationship, the maximum stress in the drum can be calculated.

关键词： Boiler Drum Finite element Stress analysis

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Effects of PSMA and experimental conditions on the morphologies of BaCO_3 whiskers

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Rare Metals 2006年第4期25卷 382-388页

作者： CHENG Bei YU Xiaoxiao YU Jiaguo ZHAO Xiujian State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

BaCO3 whiskers exhibiting different morphologies were fabricated by a simple precipitation reaction of barium ch/oride with sodium carbonate in the absence and presence of poly-（styrene-alt-maleic acid）（PSMA） as a crystal growth modifier at room temperature. The as-prepared products were characterized by scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, and X-ray diffraction （XRD）. The influences of experimental parameters on the size and morphology of BaCO3 whiskers were investigated and discussed. It was found that the as-prepared BaCO3 whiskers are single crystals with diameter ranging from 100 to 300 run, and grow along the crystallographic a-axis or [100] direction. BaCO3 whiskers with different morphologies, such as branching and dendritic structure, can be obtained depending on the experimental conditions. With increasing PSMA concentration, the diameter of BaCO3 whiskers decreases.

关键词： BaCO3 whiskers morphological control poly-（styrene-alt-maleic acid） single crystal

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Thermal Shock Resistance and Erosion Resistance of TiB_2 Multiphase Ceramic Composites

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Journal of Wuhan University of technology(materials Science) 2006年第4期21卷 117-120页

作者：何平王为民 State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

The thermal shock resistance and anti- aluminum erosion of TiB2 - BN multiphase ceramics composites were studied. The experimental results show that the TiB2-BN multiphase ceramic possesses a good thermal shock resistance at high temperatures （ 1000, 1200, 1400, 1500 ℃ ）, with the increasing in thermal shocking temperature, the electro-conductivity of TiB2-BN ceramics increases. The metal aluminum has a great influence on the properties of TiB2 - BN ceramics and the main reason is that the aluminum reacts seriously with BN. It is suggested that the content of BN should be reduced to the greatest extent.

关键词： thermal shocking resistance erosion resistance microstructure mechanism

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Iron Fibers Arrays Prepared by Electrodepositing in Reverse Liquid Crystalline

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Journal of Wuhan University of technology(materials Science) 2006年第2期21卷 66-68页

作者：赵素玲官建国 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 ChinaCenter for Material Research and Testing Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Ordered iron fiber arrays were electrodeposited on the surface of zinc foils using ＂FeSO4 solution-sodium caprylate-Decanol＂ 3-component reverse hexagonal liquid crystal as soft templates. The structure of the soft templates and the synthesized iron ,fibers were characterized by polarizing microscopy, X-ray diffraction （XRD）, scanning electron microscopy （SEM） and energy dispersive X-ray microanalysis etc. The experimental results shou that the synthesized iron fibers with a crystal phase grew up in the form of fiber clusters of about 200 nm along the direction perpendicular to the cathode surface. Each cluster was composed of several tens of fibers. The fibers had almost the same length of more than 10μm with a diameter of about 50 nm.

关键词： iron fibers arrays reverse hexagonal liquid crystal soft template electrodepositing

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Study on the isothermal oxidation behavior in air of Ti_(3)AlC_(2) sintered by hot pressing

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Science China(Technological Sciences) 2006年第5期49卷 513-520页

作者： XU Xuewen1, 2, LI Yangxian1, MEI Bingchu2, ZHU Jiaoqun2, LIU Heyan1 & QU Jingping1 1. School of material Science and Engineering, Hebei University of technology, Tianjin 300130, China 2. state key laboratory of Advanced technology for materials synthesis and processing, Wuhan Univer- sity of technology, Wuhan 430070, China School of Material Science and Engineering Hebei University of Technology Tianjin China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China

The isothermal oxidation behavior at 900–1300°C for 20 h in air of bulk Ti3AlC2 with 2.8 wt% TiC sintered by means of hot pressing was investigated in the work. The isothermal oxidation behavior generally followed a parabolic rate law. The parabolic rate constants increased from 1.39×10[10] kg[2]·m[4]·s[1] at 900°C to 5.56×10[9] kg[2]·m[4]·s[1] at 1300°C. The calculated activation energy was 136.45 kJ/mol. It was demonstrated that Ti3AlC2 had excellent oxidation resistance due to the continuous, dense; adhesive protect scales consisted of a mass of α-Al2O3; a little of TiO2;/or Al2TiO5. In principle, the oxide scale was grown by the inward diffusion of O[2]; the outward diffusion of Ti[4+]; Al[3+]. The rapid outward diffusion of cations usually resulted in the formation of cracks, gaps,; holes.

关键词： Ti3AlC2, oxidation behavior, kinetics.

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