关键词： 绝缘子   电瓷材料   性能   显微结构   制造工艺  

摘要： 整理和统计分析了80年代以来我国在电瓷材料方面所进行的大量性能试验研究结果、相应产品特性以及制造工艺上的特点;在此基础上评述了我国主要电瓷材料的组成类型、性能水平和显微结构特征、产品性能与制造工艺的关系,并提出了改进电瓷材料特性和产品性能的几点意见.

关键词： 陶瓷   显微结构   工艺  

摘要： 5、陶瓷材料显微结构参数及其测定显微结构参数系指组成瓷坯的基本结构单元(晶相、晶界、气孔和裂纹等)的种类、数量、性状及存在状态等. (一)、晶相晶相的物理和化学性能的发挥及其在瓷坯中的作用,受多种因素的制约和影响.这里仅介绍晶粒形态、晶粒取向、晶粒的三维分布特性等参数的作用及其测定方法.

ISBN: (纸本)978

摘要： 在当今多学科交叉的总趋势下，近年来固体力学工作者力图深入到材料科学中去，以期进一步揭示材料的强韧性破坏机理，从而为发展高、新材料的强韧设计与相关工艺原则……

关键词： COPOLYMERS   ELECTROACTIVE MOIETIES   COUPLING LINKAGES   NONLINEAR OPTICAL MATERIALS  

摘要： Copolymers incorporating rigid electroactive moieties and flexible segments have been synthesized in an effort to develop non-linear optical materials which can be processed into optical quality films. A variety of coupling linkages have been employed including ether, ester, amide, imine and azo linkages. Among the most attractive materials examined in this survey are heteroaromatic ladder and tetraazaannulene copolymers which yield optical non-linearities (ratioed to optical loss), chi(3)/alpha, of 10(-12)-10(-13) esu cm-1 and have desirable auxiliary properties of high laser damage threshold and fast optical switching (5 ps for three-ring copolymer). Electron donating and withdrawing groups are conveniently incorporated and these have been observed to influence optical non-linearity. The copolymer approach yields linear optical spectra characterized by sharp band edges thus optimizing the window of transparency. Finally, it is noted that this approach yields excellent control of solubility and solution viscosity necessary for spin casting in the fabrication of thin films of uniform thickness.

关键词： 耐火材料   腊石质   结构   碳质