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本文建立了-190—120℃温区内精密测定各种固体材料真比热的自动绝热量热装置.测试了十一种用于航天器热控技术的复合材料低温比热参数,绘制了曲线图,编列了数据表.用量热标准物质α-氧化铝检验了仪器装置的性能,确证其精密度为±0.04％,准确度为±0.2％.分析了测量误差,导出了误差估计公式.
In this paper, an automatic adiabatic calorimeter was developed to measure the true specific heat of solid materials in a temperature range of -190-120 ° C. The low temperature specific thermal parameters of eleven kinds of composite materials for spacecraft thermal control technology were tested and the curves The data sheet is shown in Fig. 1. The thermal mass of α-alumina was used to check the performance of the instrument, and the accuracy was ± 0.04% and the accuracy was ± 0.2%. The measurement error was analyzed and the error estimation formula was derived.