High-temperature thermal contact resistance (TCR) plays an important role in heat-pipe-cooled thermal protection structures due to the existence of contact interface between the embedded heat pipe and the heat resistive structure, and the reduction mechanism of thermal contact resistance is of special interests in the design of such structures. The present paper proposed a finite element model of the high-temperature thermal contact resistance based on the multi-point contact model with the consideration of temperature-dependent material properties, heat radiation through the cavities at the interface and the effect of thermal interface material (TIM), and the geometry parameters of the finite element model are determined by simple surface roughness test and experimental data fitting. The experimental results of high-temperature thermal contact resistance between superalloy GH600 and C/C composite material are employed to validate the present finite element model. The effect of the crucial parameters on the thermal contact resistance with and without TIM are also investigated with the proposed finite element model.

高温热接触电阻（TCR）在热管冷却的热保护结构中起着重要作用，因为嵌入式热管和耐热结构之间存在接触界面，热接触电阻的降低机理是对此类结构的设计有特殊的兴趣。本文基于多点接触模型提出了一种高温热接触电阻的有限元模型，其中考虑了与温度有关的材料特性，通过界面处空腔的热辐射以及热界面材料的影响（ TIM），并通过简单的表面粗糙度测试和实验数据拟合确定有限元模型的几何参数。利用高温合金GH600与C / C复合材料之间的高温热接触电阻的实验结果验证了本文的有限元模型。所提出的有限元模型还研究了关键参数对有无TIM时热接触电阻的影响。