The heat conductive materials with high filler content are widely used in various heat-dissipating fields. However, previous theoretical models and empirical correlations cannot accurately predict the thermal conductivity of composite with high filler content. In this study, the effects of filler contact, interface thermal resistance, thermal conductivity ratio and filler content are investigated. The results indicate that the effect of the thermal conductivity ratio on the thermal conductivity of composite is related to the filler content. The difference that caused by thermal conductivity ratio is increased rapidly with filler content. When the filler content is greater than 40%, the effects of thermal conductivity ratio cannot be ignored even the thermal conductivity ratio greater than 100. The filler content of 40% is the percolation threshold of composite that has filler contact. The effect of interfacial thermal resistance decrease rapidly with interfacial thermal resistance. A generalized correlation is derived to predict the effective thermal conductivity of filled composite with high filler content. This correlation is not only used widely (0 ≤ V_f ≤ 60%), but also has higher consistency with experimental values than other theoretical models and empirical correlations.

高填料含量的导热材料广泛应用于各种散热领域。然而，先前的理论模型和经验相关性无法准确预测具有高填料含量的复合材料的热导率。在这项研究中，研究了填料接触、界面热阻、导热系数和填料含量的影响。结果表明，导热系数对复合材料导热系数的影响与填料含量有关。由导热系数引起的差异随着填料含量的增加而迅速增加。当填料含量大于40%时，即使导热系数大于100，导热系数的影响也不容忽视。40%的填料含量是与填料接触的复合材料的渗透阈值。界面热阻的影响随着界面热阻的增加而迅速减小。推导出广义相关性以预测具有高填料含量的填充复合材料的有效热导率。这种相关性不仅应用广泛（0 ≤ V _f  ≤ 60%)，而且与实验值的一致性比其他理论模型和经验相关性更高。