摘要
C/C复合材料已在航空航天领域及原子能领域得到了广泛的应用,其工作温度可达1000℃以上。为对C/C复合材料导热系数进行测定,使用闪光法测定了C/C复合材料25℃至1000℃的热扩散系数和比热容,并对石墨喷敷、样品厚度、参比样品和修正模型的影响进行了研究。研究结果表明,为提高C/C复合材料热扩散系数测试准确度,样品应不喷敷石墨,测试结果使用渗射模型修正;为提高C/C复合材料比热容测试准确度,样品应均匀喷敷石墨,并使用石墨标准样品作为参比样品,测试结果使用Cowan模型修正。
C/C composites have been widely used in aerospace and atomic energy fields,and their working temperature can reach more than 1000℃.In order to measure the thermal conductivity of C/C composites,the thermal diff usivity and specific heat capacity of C/C composites at temperature varying from 25℃to 1000℃were measured by laser flash method.The effects of graphite coating,sample thickness,reference sample and correction procedures were studied.In order to improve the test accuracy of thermal diff usivity of C/C composites,the sample should not be sprayed with graphite,and the test results should be corrected by using the infiltration procedure.In order to improve the accuracy of the specific heat capacity of C/C composites,the sample should be uniformly sprayed with graphite,the graphite standard sample should be used as the reference sample,and the test results should be corrected by Cowan method.
作者
王惠馨
张霞
丁文皓
张忠胜
WANG Hui-xin;ZHANG Xia;DING Wen-hao;ZHANG Zhong-sheng(Shandong Nonmetallic Materials Institute,Jinan 250031,Shandong,China)
出处
《合成材料老化与应用》
CAS
2024年第2期23-26,共4页
Synthetic Materials Aging and Application
关键词
C/C复合材料
闪光法
热扩散系数
比热容
导热系数
C/C composite
laser flash method
thermal diff usivity
specific heat capacity
thermal conductivity
