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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2022, Vol. 43 ›› Issue (S2): 152-159.doi: 10.7527/S1000-6893.2022.27732

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Low-pressure thermal stability and high-temperature electrical conductivity of dense amorphous SiCN

Jiahong NIU1, Haonan JIA1, Fajun YI2, Zujun PENG3, Wei CHEN1()   

  1. 1.School of Aeronautics and Astronautics,Sichuan University,Chengdu 610207,China
    2.Science and Technology on Advanced Composites in Special Environment Laboratory,Harbin Institute of Technology,Harbin 150001,China
    3.Institute of Flexible Electronics Technology of Tsinghua,Zhejiang,Jiaxing 314006,China
  • Received:2022-06-30 Revised:2022-07-27 Accepted:2022-08-17 Online:2022-12-25 Published:2022-08-31
  • Contact: Wei CHEN E-mail:chenwei2017@scu.edu.cn
  • Supported by:
    Chinese Fundamental Research Funds for Central Universities(YJ202164);Natural Science Foundation of Sichuan Province(2022NSFSC0294);National Natural Science Foundation of China(12002312)

Abstract:

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 ℃.

Key words: high temperature sensing, SiCN, low pressure, high temperature stability, high temperature conductivity, microstructure evolution

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