基于下落式量热法的碳化硅陶瓷高温比热容测试

doi:10.3969/j.issn.1000-1093.2022.01.018

摘要/Abstract

摘要： 比热容是碳化硅（SiC）陶瓷的重要物性参数，与其导热系数及热扩散率等直接相关，是评价其热性能的重要依据。由于SiC陶瓷应用温度范围较宽，可高达1 000 ℃以上，有必要对其宽温域范围内的比热容进行研究。针对这一问题，采用下落式量热法研究SiC陶瓷材料在400~ 1 000 ℃范围内的比热容。通过蓝宝石比热容标准物质对固体材料高温比热容测试仪进行校准，结果显示：蓝宝石标准物质的比热容示值误差小于2%，保证了测试设备的准确性。SiC样品的比热容随着温度升高呈增大趋势，测量结果与文献\[21-22\]中提供的参考值基本一致，相对偏差在1.8%~2.9%范围内，表明采用下落式量热法测定SiC材料的高温比热容具有较高的准确性，是高温段除混合法之外较为可行的一种测定材料比热容方法。

关键词: 碳化硅陶瓷, 下落式量热法, 高温比热容, 蓝宝石

Abstract: Specific heat capacity is an important physical parameter of SiC ceramics, which is directly related to its thermal conductivity and thermal diffusivity. It is an important basis for evaluating its thermal properties. Due to the wide application temperature range of SiC ceramics, which can be up to more than 1 000 ℃, it is necessary to study its specific heat capacity in a wide temperature range. To solve this problem，a drop calorimetry method was used to study the specific heat capacity of SiC ceramics in the range from 400 ℃ to 1 000 ℃. The high-temperature specific heat capacity tester for measuring solid materials was calibrated by using sapphire standard reference material. The results show that the error of specific heat capacity of sapphire standard reference material is less than 2%，which ensures the accuracy of the test equipment. The specific heat capacity of SiC sample increases with the temperature increasing. The measured results are basically consistent with the reference values provided in Refs.\[21-22\]， and the relative deviation is in the range from 1.8% to 2.9%. It shows that the drop calorimetry method has high accuracy in determining the specific heat capacity of SiC material at high temperature，and it is a feasible method to determine the specific heat capacity of SiC material at high temperature in addition to the mixing method.

Key words: SiCceramic, dropcalorimetry, high-temperaturespecificheatcapacity, sapphire

中图分类号:

TQ174.75⁺8.12

王雪蓉，孙岩，王倩倩，姚凯，孟祥艳，周燕萍，刘运传，马衍东. 基于下落式量热法的碳化硅陶瓷高温比热容测试[J]. 兵工学报, 2022, 43(1): 169-174.

WANG Xuerong, SUN Yan, WANG Qianqian, YAO Kai, MENG Xiangyan, ZHOU Yanping, LIU Yunchuan, MA Yandong. Measurement of High-temperature Specific Heat Capacity of SiC Ceramics by Drop Calorimetry Method[J]. Acta Armamentarii, 2022, 43(1): 169-174.

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