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Microstructure and Properties of AlN Coating/Graphite Fabricated via In-situ Reaction

武汉理工大学学报(材料科学版) 2007年第4期22卷 718-721页

作者： JIA Tiekun WANG Weimin FU Zhengyi WANG Hao ZHAO Haiyang State Key Lab of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan430070 China

A novel method was used to fabricate AIN coating on graphite substrate. This approach included two steps: firstly, the emulsion composed of BN and anhydrous ethanol was sprayed on the surface of the graphite substrate; secondly, AIN coating was formed through the in-situ reaction of Al with the sprayed BN. The reaction was investigated by thermogravimetric-differential thermal analysis (TG-DTA), and the phase composition in the synthetic process was characterized by X-ray diffraction (XRD). Scanning electronic microscopy (SEM) was used to observe the morphology, and electron probe microanalysis (EPMA) was used to observe the distribution of the elements. The experimental results show that the AIN coating is dense and bonded with graphite tightly.

关键词： in-situ reaction AIN coating nitridation spray interface

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Modeling and simulation of PEM fuel cell based on electrochemical model

Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/...

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Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of technology (Transportation Science and Engineering) 2008年第5期32卷 933-936页

作者： Xu, Lamei Xiao, Jinsheng Pan, Mu Yuan, Runzhang State Key Lab of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China School of Automation Wuhan University of Technology Wuhan 430070 China School of Automobile Wuhan University of Technology Wuhan 430070 China

Based on the electrochemical model, a simulation model has been developed with Matlab/Simulink. Steady-state analysis has been developed to evaluate how the temperature affect the voltage and output power of the fuel cell. Dynamic analysis focus on the dynamic response of the output voltage, the output power, the consumed power, the efficiency and the internal resistance of a single PEMFC when the current of a PEMFC increase or decrease transiently. This simulation model also adapted to the simulation of PEMFC stack. The study is helpful for the optimization and control of PEMFC.

关键词： Electrochemical model Modeling Proton exchange membrane fuel cell (PEMFC) Simulation

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Microstructure and resistivity of iridium oxide thin films by pulsed laser deposition technique

Microstructure and resistivity of iridium oxide thin films b...

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作者： Zhang, L.M. Gong, Y.S. Wang, C.B. Shen, Q. State Key Lab. of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Highly conductive IrO2 thin films were prepared on Si (100) substrates by pulsed laser deposition technique from an iridium metal target in an oxygen ambient atmosphere. The effect of substrate temperature on the structure and electrical properties of IrO2 films was investigated. The deposited films at substrate temperatures ranging from 250 to 500°C under an oxygen pressure of 20Pa were pure polycrystalline tetragonal IrO 2 and the preferential growth orientation changed with the substrate temperature. IrO2 films were well solidified with the fairly homogeneous thickness and exhibited a good adhesion with the substrate. The room-temperature resistivity of IrO2 films decreased with the increase of substrate temperature and the minimum resistivity of (42±6) μΩ·cm was deposited at 500°C.

关键词： Thin films

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Growth and properties of pulsed laser deposited K3Li2Nb5O15 thin films

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key Engineering materials 2007年 351卷 184-188页

作者： Zhan, Zusheng Gong, Yansheng Shen, Qiang Zhang, Lianmeng State Key Lab. of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China School of Materials Science and Chemical Engineering China University of Geosciences Hubei Wuhan 430074 China

Potassium lithium niobate (KLN: K3Li2Nb5O15) films have been deposited on quartz glass by Pulsed laser deposition (PLD) technique using a stoichiometric KLN target as starting materials. By investigating the effects of both the oxygen pressure and the substrate temperature on the structure of KLN films, optimum parameters have been identified for the growth of high-quality KLN films. At 10Pa oxygen ambient pressure, tetragonal tungsten-bronze-type structure of KLN films with (310) preferred orientation can be achieved at substrate temperatures in the range of 700-800°C Optical studies indicate that the films are highly transparent in the visible-near-infrared wavelength range.

关键词： Thin films

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An investigation of the reaction hot-pressing synthesis of MoSi 2/Ti3SiC2/Al composites

An investigation of the reaction hot-pressing synthesis of M...

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作者： Zhang, J.Y. Fu, Z.Y. Wang, W.M. State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

MoSi2 is one of the few intermetallics to have potential for farther systems. However, the use of MoSi2 has been hindered due to the brittle nature of the material at low temperatures, inadequate creep resistance at high temperatures, accelerated (pest) oxidation at temperatures between 450-550°C. In this investigation Mo(Al,Si2)/Ti 3SiC2 composites has been prepared by reaction hot-pressing from Mo, Si, SiC, Ti, Al powder mixture under different temperatures. XRD results show that the main products are Mo(Si,Al)2 and Ti3SiC2. Part of TiC and SiC also appeared at low treating temperature. With the treating temperature increasing SiC disappeared. No evidence show lattice change of Mo(Si,Al)2. It must be the results of sufficient Al added. The electrical conductivity properties were also investigated. Samples treating under different temperatures showed different changes. Samples under high treating temperature showed a near linear change ranging from 27∼800°C and Samples under low treating temperature showed a nonlinear change.

关键词： Intermetallics

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Microstructure and Properties of A IN Coating/Graphite Fabricated via In-situ Reaction

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Journal of Wuhan University of technology(materials Science) 2007年第4期22卷 718-721页

作者：贾铁昆 State Key Lab of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology

A novel method was used to fabricate AlN coating on graphite substrate. This approach included two steps： firstly, the emulsion composed of BN and anhydrous ethanol was sprayed on the surface of the graphite substrate; secondly, AlN coating was formed through the in-situ reaction of Al with the sprayed BN. The reaction was investigated by thermogravimetric-differential thermal analysis （TG-DTA）, and the phase composition in the synthetic process was characterized by X-ray diffraction （XRD）. Scanning electronic microscopy （SEM） was used to observe the morphology, and electron probe microanalysis （EPMA） was used to observe the distribution of the elements. The experimental results show that the AlN coating is dense and bonded with graphite tightly.

关键词： in-situ reaction AlN coating nitridation spray interface

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Influence factors analysis for fabrication of silicon nitride whisker by thermal decomposition of Si(NH)2

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Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2007年第2期29卷 8-11页

作者： Bi, Yu-Hui Chen, Fei Li, Jun Zhang, Dong-Ming Zhang, Lian-Meng State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

In the present study, Si2N4 whisker was prepared by thermal decomposition of Si(NH)2, the experimental principles and process were described in detail. Influence factors such as temperature, residual carbon(C), a small quantity of oxygen and crucible material that could influence the growth of whisker was analyzed and discussed. The influence degree of each factor and mechanism were explained as well. High quality and modified Si3N4 whisker could be prepared by controlling the influence factors during the experimental process. As a result, it was significant to fabricate batch production of high performance Si3N4 whisker by utilizing this method.

关键词： α-Sialon Influence factors Si(NH)2 Si3N4 whisker

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Research on the curing reaction heat resistance of ATPU/epoxy resin system

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Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2007年第1期29卷 37-39页

作者： Chen, Wen-Yi Guan, Jian-Guo Center for Material Research and Analysis Wuhan University of Technology Wuhan 430070 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Thermogravimetry (TG-DTA) was used to study the heat resistance characteristics and curing heat decomposition kinetics of ATPU/epoxy resin system. Results showed that the decomposition temperature of the cured ATPU-2/E-44 was higher than that of ATPU-1.5/E-44. The calculation results of decomposition reaction showed that the cured system of ATPU-2/E-44 had better heat resistance, the reaction decomposition active energy of ATPU-2/E-44 system was higher than that of ATPU-1.5/E-44.

关键词： Active energy Amine-terminated polyurethane (ATPU) Epoxy resin Heat decomposition kinetics Heat resistance

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synthesis of Ti2AlC by hot pressing and thermodynamics analysis

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Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2007年第4期29卷 5-7页

作者： Wang, Ping Mei, Bing-Chu Hong, Xiao-Tin Zhu, Jiao-Qun Zhou, Wei-Bing Yan, Ming School of Sciences Wuhan University of Technology Wuhan 430070 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Ti2AlC bulk material was synthesized by hot pressing using elemental powder mixture of Ti, Al and active carbon. X-ray diffraction (XRD) in different temperature of hot pressing was used to determine the phase composition and scanning electron microscope (SEM) was observed to investigate the microstructure of samples synthesized respectively. Results show that high purity Ti2AlC bulk material was synthesized by hot pressing elemental powder mixture of 2.0 Ti/1.0 Al/1.0 C at 1500 °C for 60 minutes, in which little TiC and Ti3AlC2 existed as secondary phases. According to the results of thermodynamics calculation, for Ti, Al and C system the most stable compound in thermodynamics was TiC. Moreover, the formation of Ti3AlC2 during the synthesizing progress of Ti2AlC was explained.

关键词： Hot pressing Thermodynamics analysis Ti2AlC

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Optimization of p-type Segmented Bi_2Te_3/CoSb_3 Thermoelectric material Prepared by Spark Plasma Sintering

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Journal of Wuhan University of technology(materials Science) 2006年第4期21卷 126-129页

作者：王军 State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

A kind of p-type segmented Bi2 Te3/CoSB3 thermoetectric material was preparea oy sparse ptasma sintering（ SPS ） . When the segmented materials were used at the temperature ranging from 300 K to 800 K, the junction temperature was optimized, which is about 500 K, and the corresponding length ratio of CoSb3 to Bi2 Te3 is about 15 ： 2. The measured maximum power output of segmented materials is abont 320 W·m^-2, which is about 1.8 times as high as that of monolithic material CoSb3 under the same measuring conditions.

关键词： CoSb3 compounds bismuth telluride segmented thermoelectric materials power outpats

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