Development of High Temperature Drop-Calorimeter

这项工作的目的是在1500至2000K的温度范围内开发一种高温滴量热计。所得结果总结如下：1)加热炉采用8个外径14mm、长90mm的铬铁镧加热元件。炉的恒温区是15毫米的温度范围700到2000 k.2)真空密封的石英电池保持氮化硼被用作试样容器,避免因氧化实验困难样本在700年和1900年的温度范围内高班)的设备开发,以避免故障样本的细胞由于冲击造成的引力当细胞达到量热计管的底部。4)以蓝宝石为标准材料，测定了其量热计当量为17.700 kJ/K。5)通过对金在700 ~ 1800K温度范围内的测量，验证了该高温滴量热计和实验程序的准确性。结果与文献值的一致性在3%以内。6)在700 ~ 1820 K的温度范围内测量了硅的高温热含量。采用固相Shomate函数和液相最小二乘法推导了热容量和热含量方程。

The aim of this work is the development of a high temperature drop-calorimeter used over the temperature range of 1500 to 2000K.The results obtained are summarized as follows :1) The heating furnace used eight heating elements of the lanthanum chromite of 14 mm outer diameter, 90 mm length was made. A uniform temperature zone of the furnace is 15 mm in the temperature range of 700 to 2000K.2) A vacuum sealed quartz cell kept a boron nitride was used as a sample container to avoid the experimental difficulties arising from oxidation of samples at temperature range of 700 and 1900K.3) The dropping device was developed to avoid a breakdown of the sample cell due to a shock caused by the gravitational force when the cell reached the bottom of tube in a calorimeter.4) The calorimeter equivalent was determined using sapphire as standard material, and it was 17.700 kJ/K.5) The accuracy of this high temperature drop-calorimeter and experimental procedure was tested by performing the measurements for a gold in the temperature range from 700 to 1800K.The results agree within 3% with literature values.6) High-temperature heat content of silicon was measured over the temperature range 700 to 1820 K.The heat capacity and heat content equations were derived by use the Shomate function for solid phase and least-squares method for liquid phase.