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, %) alloy prepared by electromagnetic levitation method was investigated by using high speed camera and scanning electron microscope. The results show the growth behavior, grain size and distribution of primary silicon are obviously dependent on the nucleation undercooling. The critical undercooling ΔT1, for the growth-mode transition from lateral mode to intermediary one, and the critical......
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Oxidation Performance of Fe-Al/WC Composite Coatings Produced by High Velocity Arc Sprayed at 650℃ ZHU Sheng1,XU Bin-Shi1,ZHANG Wei1,MENG Fan-jun1,ZHU Zi-xin1,Ma Shi-ning1 (1.National Key Laboratory for Remanufacturing, Beijng, 100072, China) 摘要:The Fe-Al/WC intermetallic composite coatings have been prepared by high velocity arc spraying(HVAS)technology on 20G steel and the oxidation......
Motion behavior of non-metallic particles under high frequency magnetic field ZHANG Zhong-tao(张忠涛)1, 2, GUO Qing-tao(郭庆涛)3, YU Feng-yun(于凤云)2, LI Jie(李 捷)1, 2, ZHANG Jian(张 剑)1, 2, LI Ting-ju(李廷... particles in commercial pure aluminum under high frequency magnetic field. At the meantime, multi-pipe experiment was also done to discuss the prospect of continuous elimination of non-metallic particles......
Article ID: 1003-6326(2005)06-1297-06 High temperature brazing of diamond tools YAO Zheng-jun(姚正军)1, SU Hong-hua(苏宏华)1, FU Yu-can(傅玉灿)2, XU Hong-jun(徐鸿钧)2 (1. College of Materials Science..., the brazed diamond core-drill manufactured using the new developed technique has much higher machining efficiency and much longer operating life. Key words: high temperature brazing; microanalysis......
Sn-3.5Ag/Cu体系早期界面反应及凝固过冷行为周敏波1,李勋平1,马骁1,张新平1(1.广东省广州市华南理工大学材料科学与工程学院)摘 要:利用差示扫描量热分析法结合焊点回流过程,研究了无Pb钎料Sn-3.5Ag与Cu基底构成的Sn-3.5Ag/Cu体系模拟焊点中早期界面反应及焊点形成过程中钎料熔化和凝固特性.结果表明,加热过程中Cu向钎料合金侧的固态原子扩散导致界面生成低熔点Sn-Ag-Cu三元合金,使焊点界面在低于Sn-3.5Ag钎料熔点温度近4℃时即开始熔化;早期界面反应促使润湿过程提早发生并生成了......
Novel High Rate Lithium Intercalation Cathode Materials Cheng Yushan1,Zhang Yong2,Liu Yuwen1,Hu Xinguo2 (1.Jiangmen JJJ Battery Co., Ltd, Jiangmen 529000, China;2.Department of Applied Chemistry... of V2O5. A new type of V2O5/carbon/Nd2O3 composite was prepared by mixing vanadium oxide hydrosol, acetone, carbon and Nd2O3 powder. High rate discharge/charge property of the composite electrode......
Study on Key Techniques for Producing High Performance NdFeB Sintered Permanent Magnets 李红卫1,张深根1,张耀1,徐静1,于敦波1,赵进松1 (1.General Research Institute for Non-Ferrous Metals,Grirem Advanced Materials Corporation Limited,Beijing 100088,China) Abstract:High energy products (BH)max of 365 and 310 kJ·m-3 with intrinsic coercivity iHc of 1640 kA·m-1 of NdFeB sintered magnets were produced. Some new......
Morphology and structure of high temperature MoSi2 coating on niobium XIAO Lai-rong(肖来荣), YI Dan-qing(易丹青), YIN Lei(殷 磊), CAI hi-gang(蔡志刚) (College of Materials Science and Engineering, Central South University, Changsha 410083, China) Abstract: The high-temperature oxidation-resistant MoSi2 coating on the Nb substrate was prepared by slurry firing. The structure, compositions and phase......
MICROSTRUCTURE AND PROPERTIES OF HIGH BORON BEARING STEEL S.Y.Chen1,C.S.Liu1,Q.K.Cai1,B.Yu1,Z.T.Wang1 (1.School of Materials and Metallurgy,Northeastern University,Shenyang 110006,China) Abstract:High boron bearing steel, in which boron homogeneously distributed, was successfullyproduced in the vacuum induction furnace. The microstructural observations of castand hot rolled steels showed......
