环氧树脂/氧化铝复合材料的制备及导热模型

Heat conduction model and preparation of EP/Al_2O_3 composites

采用浇注成型法制备了环氧树脂/氧化铝复合材料,研究了氧化铝含量对所制复合材料导热、介电以及力学性能的影响。结果显示:当氧化铝含量小于体积分数0.3时,所制复合材料导热系数与Maxwell方程的计算值比较吻合,而混联模型更适合于预测氧化铝含量较高时的导热系数;该复合材料的介电常数随着氧化铝含量的增加而增加,弯曲强度随氧化铝含量的增加而先升高后降低;当氧化铝体积分数为0.375时,所制复合材料的弯曲强度达到160 MPa。

EP/Al2O3 composites were prepared by casting method. The thermal, electrical and mechanical properties of prepared composites with different Al2O3 contents were studied. The results show that the thermal conductivities of composites from experiment are consistent with the calculated value of Maxwell equation, when volume fraction of Al2O3 is less than 0.3. The hybrid model is more suitable to predict the thermal conductivities of composites with higher Al2O3 content. The permittivities of composite increase with increasing of Al2O3content. The bending strength of composites increases at first and then decreases with increasing of Al2O3 content. The bending strength reaches 160 MPa at the Al2O3 volume fraction of 0.375.