闪光法测量C/C复合材料导热系数影响因素研究
Study on Influencing Factors of Measuring Thermal Conductivity of C/C Composites by Laser Flash Method
王惠馨 1张霞 1丁文皓 1张忠胜1
作者信息
- 1. 山东非金属材料研究所,山东济南 250031
- 折叠
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.
Abstract
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 diffusivity 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 diffusivity 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.
关键词
C/C复合材料/闪光法/热扩散系数/比热容/导热系数Key words
C/C composite/laser flash method/thermal diffusivity/specific heat capacity/thermal conductivity引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据