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本文报导了一套能适用于298.15K～1200K温度范围内测定固体和液体高温焓的降落式大块型量热装置。简明介绍了用于固体或液体的试样容器。为了减少样品至容器表面的温度梯度,加速达到热平衡,在容器中加装银散热片。着重叙述量热计与等温夹套之间热交换的计算以及从试样终温校正到298.15K的方法,根据实验数据给出校正方程式。 我们采用了国际量热学会议所推荐的标准物质α-Al_2O_3标定了量热计的能当量。实验共进行19次,平均相对偏差为0.52％。为验证量热计的准确度,选用标准物质TiO_2进行测定,实验15次,相对偏差为0.98％。用TRS-80型计算机拟合,得焓温度方程式。
This article reports a set of falling bulk calorimeter that can be used to determine the enthalpy of solid and liquid enthalpy in the temperature range of 298.15K ~ 1200K. A brief description of sample containers for solids or liquids. In order to reduce the sample temperature gradient to the surface of the container to accelerate the thermal equilibrium, the installation of silver fins in the container. The calculation of the heat exchange between the calorimeter and the isothermal jacket and the method of correcting from the final temperature of the sample to 298.15K are mainly described. The calibration equation is given based on the experimental data. We use the standard calorimeter recommended by the International Conference on the α-Al 2 O 3 standard calorimeter energy equivalent. A total of 19 experiments were conducted, with an average relative deviation of 0.52%. In order to verify the accuracy of the calorimeter, the standard material TiO_2 was selected for the experiment. The experiment was performed 15 times with a relative deviation of 0.98%. Using TRS-80 type computer fitting, enthalpy temperature equation.