摘要
对基体改性前后C/C复合材料在高温下的热膨胀系数随温度的变化规律进行了研究。结果表明,基体改性前C/C复合材料在高温下的热膨胀系数随温度的变化完全符合碳素材料的一般线性变化规律,而基体改性后C/C复合材料在高温下热膨胀系数随温度的变化在900℃以前为线性关系,在900～1500℃之间为指数关系。通过数学推导与实验验证,证实了这种关系的合理性与可靠性,这对于改善C/C复合材料与其抗氧化涂层之间热膨胀系数的匹配程度,全面提高C/C复合材料的高温抗氧化性具有一定的指导意义。
The thermal expansion law of matrixmodified C/C composites under high temperatures is studied. The results show that the law, between the temperature and the thermal expansion coefficient of C/C composite, accords with the general linearity which exists in carbon materials under 900℃. However, the law, between the temperature and the thermal expansion coefficient of matrixmodified C/C composite, meets exponential relation from 900℃ to 1500℃. The law is reliable and reasonable as indicated by our experiments and mathematical analysis. Therefore, it is significant for improving the matching degree of the thermal expansion coefficient between C/C composites and their coatings, and for raising the ability to resist oxidation under high temperatures.
出处
《航空学报》
EI
CAS
CSCD
北大核心
2003年第5期471-473,共3页
Acta Aeronautica et Astronautica Sinica
基金
国防十五预研项目(00KZKYB000000253)资助项目
