致密非晶SiCN低压热稳定性及高温导电行为
收稿日期: 2022-06-30
修回日期: 2022-07-27
录用日期: 2022-08-17
网络出版日期: 2022-08-31
基金资助
中央高校基本科研业务费(YJ202164);四川省自然科学基金(2022NSFSC0294);国家自然科学基金(12002312)
Low-pressure thermal stability and high-temperature electrical conductivity of dense amorphous SiCN
Received date: 2022-06-30
Revised date: 2022-07-27
Accepted date: 2022-08-17
Online published: 2022-08-31
Supported by
Chinese Fundamental Research Funds for Central Universities(YJ202164);Natural Science Foundation of Sichuan Province(2022NSFSC0294);National Natural Science Foundation of China(12002312)
准确量化高超声速飞行器高温热端部件的气动加热量是开展热防护系统设计、提高热端部件可靠性的关键。通过开展致密非晶SiCN在低压环境下的热稳定性及高温导电行为研究探讨了将非晶SiCN应用于高超声速飞行器传感领域的可行性。结果表明致密非晶SiCN在低压环境下表现出更低的高温稳定性及抗结晶能力，即在1 300 ℃发生较明显的结晶及热分解，温度较常压高温处理非晶SiCN低约200 ℃；低压环境促进自由碳的有序化转变，导致1 000 ℃低压高温处理非晶SiCN的电阻较常压高温处理非晶SiCN低约4个数量级，表现出更低的温度敏感性。总之非晶SiCN在低压环境下仍能保持优异的温度感知能力，但使用温度有所下降，降低约200 ℃。
牛家宏 , 贾浩楠 , 易法军 , 彭祖军 , 陈伟 . 致密非晶SiCN低压热稳定性及高温导电行为[J]. 航空学报, 2022 , 43(S2) : 152 -159 . DOI: 10.7527/S1000-6893.2022.27732
Accurately quantifying the aerodynamic heating of high-temperature components of a hypersonic vehicle help develop the thermal protection system design and improve the reliability of the high-temperature components. In this paper， the feasibility about high temperature sensing of amorphous SiCN in the hypersonic aircraft field is discussed by studying the thermal stability and high-temperature electrical conductivity of dense amorphous SiCN under low pressure environment. The results show that the dense amorphous SiCN exhibits lower high temperature stability and anti-crystallization ability under low pressure environment.The visible crystallization and thermal decomposition occur at 1 300 ℃， which is about 200 ℃ lower than that of amorphous SiCN treated at normal pressure. The low pressure promotes the ordering transformation of free carbon. The resistance of amorphous SiCN treated at low pressure and 1 000 ℃ is about 4 orders of magnitude lower than that of amorphous SiCN treated at normal pressure， showing lower temperature sensitivity. In conclusion， amorphous SiCN still maintains excellent temperature sensing ability under low pressure environment， but the operating temperature has dropped by about 200 ℃.
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