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研制了比热、热导、线胀以及弹性模量等十种低温物性测定装置。在大量实验的基础上解决了以下理论问题:一,从简单固体原子比热的Debye模型出发,提出了低温比热测试中最佳温升的概念并推出最佳温升方程;二,在各向同性模型的Harding方程的基础上,推出了各向异性泡沫绝热材料的闭孔率测定方程;三,提出了新的试样组装方法和合理的试验程序,解决了用平板热导仪难以准确测定泡沫绝热材料低温热导率的问题;四,尝试用正交多项式最小二乘拟合技术求大范围低温(20—280K)物性经验公式的设想,并获得满意的结果。
Development of specific heat, thermal conductivity, linear expansion and elastic modulus ten kinds of low temperature properties measuring device. Based on a large number of experiments, the following theoretical problems have been solved: First, from the Debye model of simple solid atomic specific heat, the concept of optimal temperature rise in low temperature specific heat test is put forward and the optimal temperature rise equation is introduced. Second, Based on the Harding equation of the same-sex model, the closed-cell rate determination equation of anisotropic foam insulation is introduced. Thirdly, a new sample assembly method and a reasonable test procedure are proposed to solve the problem that it is difficult to accurately measure the closed- The problem of low temperature thermal conductivity of foamed thermal insulation material was determined; Fourth, try to use the orthogonal polynomial least squares fitting technique to get the ideal of large-scale low temperature (20-280K) physical property formula and obtain the satisfactory result.