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通过有限元方法分析计算了高填充型复合材料面心立方和紧密堆积单胞模型的等效热导率。模拟研究了填料的填充量、填料的热导率和填料间接触面积的相对大小对复合材料等效热导率的影响。结果发现高填充量的面心立方复合材料可以获得较高等效热导率,大小颗粒混合填充的紧密堆积复合材料能够更大幅度地提高等效热导率。并且当填充颗粒之间出现接触时,等效热导率会随着填料间接触面积的增大而快速地增大。模拟研究表明,通过增加填料含量以及使填料之间相互接触形成热流通路是获得高热导率复合材料的有效途径,同时有助于指导相关的实验研究从而生产出高热导率的热界面材料。
The equivalent thermal conductivities of the face-centered cubic and closely packed cell model of highly filled composites were calculated and analyzed by finite element method. The effects of filler loading, thermal conductivity of filler and contact area between fillers on the equivalent thermal conductivity of the composites were studied. The results show that high loading of Fcc composite material can obtain higher equivalent thermal conductivity. The close-packed composites filled with mixed particles of large and small particles can greatly improve the equivalent thermal conductivity. And when contact occurs between the filler particles, the equivalent thermal conductivity increases rapidly as the contact area between the filler particles increases. Simulation studies show that increasing the filler content and forming contact between the filler and the heat flow path is an effective way to obtain high thermal conductivity composite materials, and help to guide the relevant experimental research to produce thermal interface materials with high thermal conductivity.