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前言本文详细描述了我们研制的60—370K范围内精密测定材料比热的真空自动绝热量热装置。该装置的加热器与样品容器采用分离结构,减小了量热容器的温度梯度和由此引起的热漏,从而提高了绝热控制的质量及测量精度。通过实际测量国际量热学会议所推荐的标准物质——α-Al_2O_3的比热,证实了该装置精度高,性能可靠;在全温区内,本文结果与美国标准局数据符合在±0.50％以内,可完全满足工程设计上对材料比热参数的要求。一、基本原理将m克被测试样装入量热容器中,当量热计恒定到所需要的实验温度后,通入直流电流加热量热体系(试样和量热容器),使之升高一定的温度。整个实验过程均在良好的绝热情况下进行。通过测量通入量热体系的电能Q。和由此引起的温升△T,按下式求出试样的比
Preface This article describes in detail the automatic vacuum calorimeter calorimeter that we have developed to measure the specific heat of material within the 60-370K range. The heater and the sample container of the device adopt a separation structure, which reduces the temperature gradient of the heat container and the heat leak caused thereby, so as to improve the quality and accuracy of the adiabatic control. Through the actual measurement of the specific heat of α-Al 2 O 3, which is recommended by the international calorimetry conference, the device is proved to be of high precision and reliable performance. The results of this paper agree well with those of the American Bureau of Standards within ± 0.50% , Can fully meet the engineering design requirements of the specific thermal parameters of the material. First, the basic principle of m grams of the sample is loaded into the volumetric heat container, the equivalent calorimeter is constant to the required experimental temperature, the introduction of direct current heating calorific system (sample and calorimeter), make it rise A certain temperature. The entire experiment was conducted under good adiabatic conditions. By measuring the thermal energy of the incoming system Q. And the resulting temperature rise △ T, according to the following formula to determine the ratio of the sample