将氮化硼(BN)粉末添加到环氧树脂(EP)中,制备了BN/EP绝缘导热复合材料,并对其热导率、抗拉强度、断面SEM(扫描电子显微镜)以及热失重进行分析,同时探究随着填充量的增加,复合材料的热导率和抗拉强度的变化趋势.结果表明:当20 μm的BN的填充量为30％时,由其制备的复合材料的热导率在25℃时达到了0.92W/(m· K),抗拉强度为15.5 MPa.并且随着BN填充量的增加,复合材料的热导率也逐渐增加,但抗拉强度逐渐降低.热失重分析说明随着BN填充量的增加,绝缘导热材料的起始分解温度并没有太大的变化,而复合材料的热失重量逐渐减少,分解温度逐渐升高.此外,随着添加BN粒径的增大,复合材料的热导率会增大,而抗拉强度却会减小.
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