通过数值技术及实验手段研究了含有球形氮化铝(AlN)导热填料的有机灌封硅橡胶的导热性能.采用随机序列吸附(RSA)方法,建立了AlN增强有机灌封硅橡胶的三维有限元模型,该模型可以生成颗粒位置随机分布、颗粒直径任意调整的代表体积单元,能够得到单一粒径和多粒径的模型.制备了半径3μm AlN增强硅橡胶的复合材料,并测试了不同填充量下体系的导热系数.对比有限元方法得到的导热系数预测值与实验测试结果,证明该模型能够较精确地模拟球形填料增强的复合材料.模拟结果显示:灌封胶的导热系数随着AlN含量的增加而增大,并且质量分数大于50%时增大的幅度越来越大;填料粒径呈正态分布时,能够在硅橡胶基体中有效堆积而提高填充量;两种粒径比例不同时,导热系数也不同.
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