真空低温下卫星常用材料接触热阻的试验研究

真空、低温环境下接触热阻的准确测量对于卫星内部热控制具有重要的实际意义。自行搭建了一套优化的基于稳态法测量接触热阻的试验平台，用于在真空、低温环境下测量由螺栓压紧的材料间的接触热阻。测量了卫星中常用接触对（铝合金-铝合金、铝合金-玻璃钢、铝合金-聚酰亚胺）在不同温度、不同预紧力矩下的接触热阻，研究了预紧力矩、温度、材料对接触热阻的影响，结果表明：玻璃钢与聚酰亚胺的隔热性能优于铝合金；3种接触对的接触热阻均随温度升高而减小，随螺栓预紧力矩的增大而减小。

Experimental study of the thermal contact resistance of materials commonly used in satellites under vacuum and low temperature

The accurate measurement of thermal contact resistance (TCR) in vacuum and at low temperature has practical significance for internal thermal control in satellite. A set of optimized TCR measurement platforms based on the steady-state method was built to measure the TCR between bolted specimens in vacuum at low temperature. The TCR between materials commonly used in satellites, including aluminum alloy to aluminum alloy joints, aluminum alloy to glass fiber reinforced plastic (FRP) joints and aluminum alloy to polyimide joints, were measured at different temperatures and for different pre-tightening torques. The effects of varying the pre-tightening torque, temperature and material on TCR were investigated. The results show that the heat insulation properties of FRP and polyimide are better than that of aluminum alloy. The TCR of the three contact pairs decreases with the increase of temperature, and decreases with the increase of pre-tightening torque.