氮化硼填充甲基乙烯基硅橡胶导热复合材料的性能

涂春潮　 齐暑华　 周文英　 杨岩　 米志安　 裴高林　

摘　要：用0.3,6.0,20.0μm 3种粒径的氮化硼(BN)(质量比为1:1:3)混合填充甲基乙烯基硅橡胶(MVQ),研究了BN用量对MVQ导热系数、热失重、热膨胀系数、硫化特性的影响.结果表明,随着BN用量的增加,MVQ的导热系数和热分解温度升高,热失重量和热膨胀系数明显降低,但对MVQ的硫化反应影响不大;当BN填充量为150份时,MVQ的综合性能较佳.
关键词：甲基乙烯基硅橡胶;氮化硼;导热系数;热失重;热膨胀系数;硫化
分类号：TQ333.93 　文献标识码：B
文章编号：1000-1255(2009)03-0238-03

Properties of methyl vinyl silicone rubber heat conductive composites filled with boron nitride

Tu Chunchao（Beijing Institute of Aeronautical Material,Beijing 100095,China）　 Qi Shuhua（Department of Applied Chemistry,School of Science,Northwestern Polytechnic University,Xi'an 710072,China）　 Zhou Wenying（State Key Laboratory of Electrical Insulation and Power Equipment,Xi' an Jiaotong University,Xi'an 710049）　 Yang Yan（Luhang Zhu Beijing Area Military Representative Section,Beijing 100095,China）　 Mi Zhian（Beijing Institute of Aeronautical Material,Beijing 100095,China）　 Pei Gaolin（Beijing Institute of Aeronautical Material,Beijing 100095,China）　

Abstract：The mixed boron nitride (BN) particles with different sizes of 0.3,6.0,20.0 μm and mass ratio of 1: 1: 3 were filled in methyl vinyl silicone rubber(MVQ).The effect of BN amount on thermal conductivity,thermal degradation,coefficient of thermal expansion (CTE) and curing characteristics of MVQ were studied.The results showed that thermal conductivity and the temperature of thermal decomposition in-creased with increasing BN amount,while thermal degradation and CTE declined,but the effect of BN on the cure characteristics of MVQ was less.When BN was 150 phr,the comprehensive performance of MVQ was better.
Keywords：methyl vinyl silicone rubber;boron nitride;thermal conductivity;thermal degradation;coefficient of thermal expansion;cure