低温真空下固体界面间接触导热的实验研究

Experimental Research on the Heat Transfer Between the Solid Interfaces at Low Temperatures and Vacuum

在 1 1 0～ 3 2 5K温度范围内 ,对低温下两种常用接触材料———不锈钢和铝 ,进行了大量的接触导热试验研究 ,着重探讨了接触热导与界面载荷、温度和表面分形参数的关系。实验结果表明 :在该实验条件下 ,两种材料接触热导与载荷关系的实验幂指数均在0 4～ 0 6之间 ;温度是通过材料的热导率和力学性能对接触导热发生作用的 ;接触热导随着表面分形维数的增加而增加。

An experimental program which investigate the thermal contact conductance (TCC) of stainless steel and aluminum alloy surface in cryogenic environment is descri bed. The effects of contact pressure (P), interface temperature and fractal para meters on TCC are emphasized. From the experimental results, it is indicated tha t the TCC P pressure exponent of this paper are all within the range of 0 4 to 0 6, and the interface temperature influences TCC through the material propert ies. As the fractal dimensions rising, the TCC increases in the condition of thi s research.