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

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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Research on liquid water transport for self-humidifying membrane of PEMFC

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Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2007年第11期29卷 4-6+43页

作者： Zhan, Zhi-Gang Li, Da-Yong Xiao, Jin-Sheng Pan, Mu Yuan, Run-Zhang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China School of Energy and Power Engineering Wuhan University of Technology Wuhan 430063 China

The proton exchange membrane could be sufficiently hydrated when a proton exchange membrane fuel cell (PEMFC) operated normally. Based on Springer model, the equation of the distribution of water molecules number bonded with SO4 in the membrane was derived. Considering the effects of the membrane thickness, operating temperature and current density, the water transfer in the membrane was analyzed. Conclusions were drawn that the thinner the membrane can be more easily self-hydrated;the thinner the membrane was and the higher the current density was, the less the time was needed to hydrate the membrane;when the thickness was less than 15 μm and current density was higher than 0.6 A/cm2, the time was decreased drastically. The conclusions were helpful for PEMFC's design and operation.

关键词： Fuel cell Proton exchange membrane Self-humidifying Transfer Water

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Fabrication of Energy Storage Media BST/PVDF-PAn

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

作者： Luo, Dabing Guo, Yan Hao, Hua Liu, Hanxing Ouyang, Shixi State Key Laboratory of Advanced Technology for Materials’ Synthesis and Processing Wuhan University of Technology Wuhan City Hubei People’s Republic of China School of Materials Science and Engineering Wuhan Unvisity of Technology Wuhan Hubei People’s Republic of China State Key Laboratory of Advanced Technology for Materials’ Synthesis and Processing Wuhan Unvisity of Technology Wuhan City Hubei People’s Republic of China

Permittivity and anti-voltage ability commonly determined the energy storage density of material. Although composite could be molded easier than ceramic, its lower energy storage density prevented the material from application since the polymer usually took on poor dielectric constant. In order to enhance the energy storage performance of composite, PAn was introduced to PVDF by emulsion polymerization. SEM of the co-polymers showed that they could construct continuous media till the concentrate of aniline reached 25% while polymerizing. The permittivity of polymer rose along with the concentrate increasing of aniline and pH falling value of retreating solution. The permittivity and anti-voltage strength of composite also charged correspondingly. As a consequence, the energy storage density innovated much higher than ever. The maximum energy storage density could approach 0.9185Johr/cc.

关键词： composite energy-storage polymerization

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CRAM cell structure thermally compatible with CMOS circuits

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Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2007年第11期29卷 72-75页

作者： Xiang, Hong-You Wang, Jia-Fu Li, Juan Department of Physical Science and Technology 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

A one-dimensional multi-layer heat conduction model of CRAM is developed based on its memory principle. According to the read/write requirement of memory cell, and to the condition of its thermal compatibility with CMOS circuits, the critical parameters are fixed on. The temperature profiles are portrayed by solving the heat conduction equation with the reasonable boundary conditions. Under the limitation of the critical parameters, we adjust the parameters of cell structure, use heating layer, and then develop the structural model of CRAM memory cell which not only meet the need of read/write function of memory cell but for the first time achieve the thermal compatibility of CRAM memory cell with CMOS circuits.

关键词： Chalcogenide CRAM Heat compatibility Phase change

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Effect of interface-roughness scattering on mobility degradation in SiGe p-MOSFETs with a high-k dielectric/SiO2 gate stack＊

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Chinese Physics B 2007年第12期16卷 3820-3826页

作者：张雪锋徐静平黎沛涛李春霞官建国 Department of Electronic Science & Technology Huazhong University of Science and Technology Wuhan 430074 China Department of Electrical & Electronic Engineering the University of Hong Kong Pokfulam Road Hong Kong China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

A physical model for mobility degradation by interface-roughness scattering and Coulomb scattering is proposed for SiGe p-MOSFET with a high-k dielectric/SiO2 gate stack. Impacts of the two kinds of scatterings on mobility degradation are investigated. Effects of interlayer （SiO2） thickness and permittivities of the high-k dielectric and interlayer on carrier mobility are also discussed. It is shown that a smooth interface between high-k dielectric and interlayer, as well as moderate permittivities of high-k dielectrics, is highly desired to improve carriers mobility while keeping alow equivalent oxide thickness. Simulated results agree reasonably with experimental data.

关键词： MOSFET high-k dielectric SiGe interface roughness scattering Coulomb scattering

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Analysis of heat transfer and thermal stress in thermal and environmental barrier coatings

Analysis of heat transfer and thermal stress in thermal and ...

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作者： Xiao, Jinsheng Liu, Chunxiao Zhao, Wenhua Fu, Weibiao School of Automotive Engineering Wuhan University of Technology Hubei 430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei 430070 China State Key Laboratory of CAD and CG Zhejlang University Hangzhou Zhejiang 310058 China Department of Engineering Mechanics Tsinghua University Beijing 100084 China

A kind of gradient thermal and environmental barrier coating applied in internal combustion engine is brought forward to improve its reliability, emission and efficiency. The multi-layer plate and cylinder models are established for the simulations of heat transfer and thermal stress in the coatings. Both the theoretical and the numerical analysis with multi-layer cylinder model with coating inside are carried out and compared. The results show good agreement.

关键词： Thermal barrier coatings

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Lower and upper bounds of mechanical and thermal properties of ceramic/metal composites

Lower and upper bounds of mechanical and thermal properties ...

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作者： Xiao, Jinsheng Zhan, Zhigang Zhao, Wenhua Fu, Weibiao School of Automotive Engineering Wuhan University of Technology Hubei 430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei 430070 China School of Energy and Power Engineering Wuhan University of Technology Hubei 430063 China Department of Engineering Mechanics Tsinghua University Beijing 100084 China

In this paper, the lower and upper bounds of Young's modulus and Poisson ratio are determined by the effective stress method and effective strain method from material mechanics. The effective heat flux method based on the hypothesis of equivalent temperature difference and the effective temperature difference method based on the hypothesis of equivalent heat flux are proposed, the lower and upper bounds of the thermal conductivity of ceramic/metal composite material are determined similarly. The result shows that the property values of ceramic/metal composites calculated from current theoretical property formulas are within the lower and upper bounds determined by the above methods.

关键词： Ceramic materials

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Fabrication and characterization of ceramic/metal gradient thermal barrier coating

Fabrication and characterization of ceramic/metal gradient t...

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作者： Xiao, Jinsheng Hu, Chunzhi Zhao, Wenhua Fu, Weibiao School of Automotive Engineering Wuhan University of Technology Hubei 430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei 430070 China College of Naval Architecture and Power Naval University of Engineering Hubei 430033 China Department of Engineering Mechanics Tsinghua University Beijing 100064 China

Four Coating schemes and two substrate materials are designed to evaluate the characteristics of the ceramic/metal gradient thermal barrier coating. The gradient coating is successfully prepared by plasma spray with single torch and single feeder. The coating performance is evaluated by observing microstructure, measuring thermal shock resistance and thermal residual stress. The coating microstructure is observed by scanning electron microscope (SEM). Diffractive peaks for the gradient coating are got at different zone by X-ray spectroscopy (XRS). The thermal shock experiment shows that the thermal shock resistance property of the gradient coating is better than that of the non-gradient coating. The measurements of thermal residual stresses in different coating schemes are carried out by hole-drilling method, the results show that compressional stress presents on 1Cr18Ni9Ti substrate and tensile stress presents on 2Cr13 substrate.

关键词： Thermal barrier coatings

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Fabrication and dielectric properties of Si3N 4-MgO-Al2O3 by spark plasma sintering technique

Materials Science

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materials Science 2007年第3期25卷 699-707页

作者： Li, J. Chen, F. Shen, Q. Jiang, H. Zhang, L. State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China School of Chemical Engineering Shandong University of Technology Zibo 255049 China

In the present study, α-Si3N4 was prepared using MgO and Al2O3 as the sintering additives and spark plasma sintering (SPS) technique. The SPS sintering behaviour and mechanism have been discussed. The relationship between the content of sintering additives, sintering temperature, and relative densities of the samples have been analyzed. The phase composition was determined by XRD, the microstructures of the fracture surfaces were observed by SEM and the dielectric properties have been tested. The results suggest that when the sintering temperature is 1300-1500 °C, the content of sintering additives - 6-10%, the relative density of the sintered samples is 64-96%. When the sintering temperature reaches 1400 °C, the content of sintering additives 10%, the samples could be fully dense sintered (the relative density up to 95%) The sintering mechanism is liquid phase sintering. The electric permittivity of the sintered samples is 5-8 being in a close relationship with the relative density. The dielectric loss, influenced by the liquid phase, is less than 1 × 10-2.

关键词： Silicon compounds

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Transient stress field analysis of liquefied petroleum gas vessel under pool fire surrounding

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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5期31卷 879-881+897页

作者： Yin, Qizhi Xiao, Jinsheng Zhao, Zaili Yang, Bo 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 Materials Synthesis and Processing WUT Wuhan 430070 China

The transient stress field analysis aims at the thermal and mechanical response of LPG vessel under pool fire surrounding environment. Finite element analysis method is used to calculate the stress field. Thermal boundary conditions of LPG vessel are determined according to heat transfer theory and calculated by the software PLGS99. The results show that the maximum whole stress of the vessel appears near the highest surface where liquid can reach, the maximum thermal stress is much greater than the maximum mechanical stress and fluctuation of liquid surface is the main reason of high stress. The highest position of the LPG vessel which liquid can reach should be protected as it is the most dangerous place.

关键词： Finite element Liquefied petroleum gas Pressure vessel Stress analysis

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