导热硅橡胶复合材料研究  

Thermally Conductive Silicone Rubber Composites

作　　者：周文英[1] 齐暑华[1] 涂春潮[1] 赵红振[1] 吴波[1] 

机构地区：[1]西北工业大学理学院应用化学系,西安710072

出　　处：《航空材料学报》2007年第1期33-36,共4页Journal of Aeronautical Materials

基　　金：国防预研项目(N3HB1811)

摘　　要：以甲基乙烯基硅橡胶为基胶,两种不同粒径(3μm,20μm)的微米氧化铝为导热填料制备了填充型导热绝缘硅橡胶。研究了不同粒径氧化铝混合填充用量对硅橡胶导热性能、硫化行为、热膨胀系数、热稳定性影响。结果表明,随氧化铝用量增加体系热导率和热稳定性显著上升,线性膨胀系数降低,填料对硅橡胶硫化影响不大。使用电子级玻璃布为增强体制得了热导率达0.92 W.(m.K)-1、电绝缘和力学性能优良,适宜作为绝缘导热场合的热界面使用的导热硅橡胶复合材料。The thermal conductive and electrically insulating silicone rubber was prepared using the methyl vinyl silicone rubber and heat conductive hybrid alumina powder with two different particle sizes. The examinations of effects of alumina filler content on the thermal conductivity, mechanical properties, curing behavior, coefficient of thermal expansion （CTE） and heat stability of the silicone rubber indicated that the thermal conductivity and heat stability increased with increasing the filler content, while CTE and mechanical properties declined ; alumina has a slight influence on the curing reaction of silicone rubber. In addition, a novel type of electrical fiberglass reinforced composite silicone rubber with thermal conductivity of 0.92 W · （m · K）^-1 , good electrical insulation and mechanical properties, was developed based on the alumina filled silicone rubber. The developed composite silicone rubber is a kind of ideal thermal interfacial materials for heat dissipation of higher performance devices.

关 键 词：硅橡胶 三氧化二铝 热导率 热界面材料 热膨胀系数 

分 类 号：TB332[一般工业技术—材料科学与工程]