填充颗粒导热性对复合材料导热性能的影响

Effect of the Thermal Conductivity of Filler Particles on Heat Conduction Property of Composites

基于ANSYS Workbench稳态热分析模块,利用均匀化方法,研究了填充颗粒导热性对填充型复合材料导热性能的影响。结果表明,依靠增大填充颗粒导热系数来提高复合材料整体的导热性能有一定局限性,填料导热系数与基体材料导热系数之比存在一个临界值。在相同体积分数下,随着比值的增大复合材料导热系数增加,当达到临界值后继续增大比值复合材料的导热系数基本不变。不同形状的填充颗粒有不同的临界值,圆柱形颗粒的临界值略大于正方体形和球形,而且对于同一种形状的填充颗粒,随着填充分数的增大临界值略有增加。

Based on the ANSYS Workbench steady state thermal analysis module, effects of the thermal con- ductivity of filler particle on composites were presented with the homogenization method. The results show that criti- cal ratio of filler thermal conductivity to matrix thermal conductivity for different filler particles would be reached with the increase of filler particle thermal conductivity. Below the critical ratio the thermal conductivity of composite in- creased with the thermal conductivity of filler, while beyond the critical ratio there was no significant improvement. Be- sides, filler particles with different shapes have different critical ratios, for example, the critical ratios of cylindrical particles were larger than those of cubic and sphere particles. At the same time, the critical ratios of filler particles in- creased with the increasing filling fractions of particles.