固体材料低温热导率的测量

Thermal conductivity measurements of solid materials at low temperatures

本实验以4.2K二级G-M制冷机为冷源,采用稳态轴向热流法测量了304不锈钢与环氧玻璃钢在低温下的热导率,讨论了样品上初始温差的成因及其影响,给出了热导率真实值所在的区间,并对测量误差以及各种漏热带来的影响进行了分析。

In this paper, a 4.2K two- stage G- M refrigerator was used as the cold source to have the test of the thermal conductivities of 304 stainless steel and glass fiber reinforced epoxy at low temperatures by using the longitudinal steady heat flow method. The origins of the initial temperature difference of the samples and the corresponding influences were discussed, and the range where the true values of thermal conductivity was obtained. The measurement error and the effect of heat leakage were also analyzed.