共搜索到20527条信息，每页显示10条信息，共2053页。用时：0小时0分0秒265毫秒
......
Trans. Nonferrous Met. Soc. China 22(2012) 2726-2729 Influence of pyrolysis temperature on structure and dielectric properties of polycarbosilane derived silicon carbide ceramic DING Dong-hai1, 2... to the increase in complex permittivity. Key words: silicon carbide ceramic; polycarbosilane derived SiC; dielectric properties; pyrolysis temperature; free carbon; complex permittivity 1 Introduction The needs......
method and mechanical mixing method, and were pressureless liquid-phase sintered to prepare silicon carbide ceramic. The effects of adding methods on the sintering behaviour, mechanical properties and microstructure of silicon carbide ceramic were analyzed. The results show that at the sintering temperature of 1950℃, silicon carbide ceramic, with SiC/(Al2O3+Y2O3) composite powder by mechanical......
thermal stability than the SiC(OY) fibres. Key words: polycarbosilane; yttrium; silicon carbide; fibre 1 Introduction The pyrolysis of polycarbosilane (PCS) used for the preparation of silicon... thermal stability than the SiC(OY) fibres. References [1] YAJIMA S, HAYASHI J, OMORI M, OKAMURA K. Development of a silicon carbide fibre with high tensile strength [J]. Nature, 1976, 261: 683-685. [2......
the reaction path and further increase the conversion of silicon carbide at a lower temperature. It is considered that the assistant reduction consists of three steps: vaporizing and melting of silicon, formation of silicon monoxide, and synthesis of silicon carbide. The morphology of the synthesized SiC powders through the silicon assistant method can be affected apparently by the experimental temperature......
Effect of Graphene Nanoplate and Silicon Carbide Nanoparticle Reinforcement on Mechanical and Tribological Properties of Spark Plasma Sintered Magnesium Matrix CompositesAniruddha Das,Sandip... reinforced with low reinforcement content(up to 4-5 vol.%)of graphene nanoplates(GNPs) and silicon carbide(SiC) nanoparticles using ball milling and spark plasma sintering(SPS) is reported. Near full......
Kinetics of Carbide Layer Forming on the Surface of Steel in Molten SystemsShuhuan Wang Shengwen Wu Shantong Jin Metallurgy School, UST Beijing, Beijing 100083, China摘 要:<正> A mathematical model of kinetics of carbide layer formed on the surface of steel in fused system was set up with the theory of non-stable diffusion mass transfer and regular......
结构吸波纤维及其复合材料的研究进展 黎炎图1,冯春祥2,杜作娟1,黄小忠1 (1.中南大学物理科学与技术学院,长沙,410083;2.国防科学技术大学航天与材料工程学院,长沙,410073) 摘要:结构吸波纤维及其复合材料具有吸波性能好,质量轻,可承载等优点,已成为结构吸波材料的重要发展方向,对隐身武器的设计和制造具有重要意义.综述了结构吸波纤维及其复合材料的最新研究成果,探讨了碳纤维,碳化硅纤维,玻璃纤维增强吸波材料以及几种其它类型的结构型吸波材料,展望了结构吸波纤维及其复合材料的发展趋势. 关键词:结构吸波材料; 碳纤维; 碳化硅纤维; 玻璃纤维; 吸波性能; structural absorbing materials; carbon fiber; silicon carbide fiber; glass fibers; absorbing quality; [全文内容......
高纯净GCr15轴承钢组织演变与快速球化工艺的研究闫文凯1,2,杨卯生2,杜景红0,俞峰1(1.云南省昆明市昆明理工大学材料科学与工程学院2.北京市钢铁研究总院结构材料研究所)摘 要:利用碳化物的金相形貌,数量,大小,分布及圆整度表征试验钢的球化质量,通过不同的热处理制度研究高纯净GCr15轴承钢预备组织与退火工艺对碳化物球化质量的影响.试验表明:优良的预备组织适宜的退火制度有利于碳化物在短时间内球化和细化,采用文中退火制度a,GCr15轴承钢碳化物圆整度为0.087μm,平均粒径为0.27μm,球化时间比传统......
Thermal conductivity and mechanical properties of high density polyethylene composites filled with silicon carbide whiskers modified by cross-linked poly(vinyl alcohol)Jiaming Fan1,Shiai Xu1,21... of poly(vinyl alcohol)(PVA) was coated on the surface of silicon carbide whiskers(SCWs)and crosslinked by glutaraldehyde, and then these modified whiskers(mSCWs) were incorporated into high density......
