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Trans. Nonferrous Met. Soc. China 22(2012) 1106-1111 Electrical and mechanical properties of Cu-Cr-Zr alloy aged under imposed direct continuous current WANG Zhi-qiang, ZHONG Yun-bo, RAO Xian-jun... Abstract: The Cu-Cr-Zr alloys were aged at different temperatures for different time with different current densities. The results show that both the electrical conductivity and hardness are greatly......
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Gate leakage current of NMOSFET with ultra-thin gate oxideHU Shi-gang(胡仕刚), WU Xiao-Feng(吴笑峰), XI Zai-fang(席在芳)(School of Information and Electrical Engineering, Hunan University of Science... becomes more and more prominent and has been one of the most important limiting factors to MOSFET and circuits lifetime. Based on reliability theory and experiments, the direct tunneling current......
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Improved Corrosion Resistance of Magnesium Alloys AZ31 and AZ91HP by High Current Pulsed Electron Beam Treatment ZHOU Ji-yang1,DONG Chuang2,GAO Bo1,HAO Sheng- zhi2 (1.Department of material... treatment of magnesium alloys AZ31 and AZ91HP by a high current pulsed electron beam (HCPEB)was investigated in the present paper. The corrosion resistance of treated samples was tested in a 5% (wt......
Current efficiency of Ga electrodeposition under different anions concentrationsKe-Ke Li1,2,Yi-Fei Zhang1,Shao-Tao Cao1,Yi Zhang11. National Engineering Laboratory for Hydrometallurgical Cleaner...:The gallium electrodeposition from alkaline solution has a very low current efficiency,the reason for which is still not quite understood.The effects......
Producing Ceramic High Tc Superconductors for Strong Current Applications Shi-Xue Dou1,Xue-Kei Fu1,Yuan-Chang Guo1,Jian-Xun Jin1 (1.Institute for Superconducting and Electronic Materials, Wollongong University, NSW 2522, Australia) 摘要: Strong current and large-scale application is the most important prospect of high Tc superconductors (HTS).Practical HTS samples, both in forms of wire......
短切SiC_f/LAS复合材料的显微结构与介电性能 罗发1,翟晓勇1,朱冬梅1,周万城1 (1.西北工业大学,凝固技术国家重点实验室,陕西,西安,710072) 摘要:采用热压烧结法制备出致密的短切SiC_f增强LAS玻璃陶瓷复合材料,并讨论保温时间与热压压力对复合材料介电性能的影响.结果表明,测试频率在8~12 GHz之间,复合材料复介电常数实部ε′由基体的7.6上升到10~100,虚部ε″由基体的0.34上升到40~160,介电损耗tgδ由基体的0.04上升到1~20,并具有明显的频散效应.随保温时间的延长或热压压力的提高,复合材料ε′增大,ε″与tgδ减小.此外,断口形貌的SEM观察表明,随保温时间的延长或热压压力的提高,复合材料界面层变厚. 关键词:短切SiC纤维; LAS玻璃陶瓷; 介电性能; chopping SiC_f; LAS glass-ceramic......
短切SiCf/LAS复合材料的介电性能 罗发1,翟晓勇1,朱冬梅1,周万城1 (1.西北工业大学凝固技术国家重点实验室,西安,710072) 摘要:讨论了纤雏长度与热压保温时间对含量为25%(体积分数)的短切SiCf增强LAS玻璃陶瓷复合材料介电性能的影响.在8~12GHz频率范围内,介电性能测试结果表明,随纤维长度由2mm增加到4mm,复合材料的复介电常数实部ε′增大,而其虚部ε″及介电损耗tgδ减小.当保温时间由10min延长到20min时,复合材料的ε′增大,而其ε″与tgδ均减小;且保温20min时,其ε′,ε″与tgδ均已接近适合损耗微波能量的数值.复合材料有望成为电损耗型宽带微波损耗材料. 关键词:复合材料; 短切SiC纤维; LAS玻璃陶瓷; 介电性能; composite; chopping SiCf; LAS glass-ceramic; dielectric......
