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Preperation of Silicon Carbide Oxidation Protection Film on Carbon Thermal Insulator Using Polycarbosilane and Its Characterization

폴리카보실란을 이용하여 탄소단열재에 코팅한 실리콘카바이드 코팅막의 내산화 특성

  • Ahn, Su-Bin (Energy & Environment Division, Korea Institute of Ceramic Engineering and Technology) ;
  • Lee, Yoonjoo (Energy & Environment Division, Korea Institute of Ceramic Engineering and Technology) ;
  • Bang, Jung-Won (Energy & Environment Division, Korea Institute of Ceramic Engineering and Technology) ;
  • Shin, Dong-Geun (Convergence R&D Division, Korea Institute of Ceramic Engineering and Technology) ;
  • Kwon, Woo-Teck (Energy & Environment Division, Korea Institute of Ceramic Engineering and Technology)
  • 안수빈 (한국세라믹 기술원, 에너지 환경 소재 본부) ;
  • 이윤주 (한국세라믹 기술원, 에너지 환경 소재 본부) ;
  • 방정원 (한국세라믹 기술원, 에너지 환경 소재 본부) ;
  • 신동근 (한국세라믹 기술원, 융합연구사업단) ;
  • 권우택 (한국세라믹 기술원, 에너지 환경 소재 본부)
  • Received : 2017.05.25
  • Accepted : 2017.08.14
  • Published : 2017.09.27

Abstract

In order to improve the high temperature oxidation resistance and lifespan of mat type porous carbon insulation, SiC was coated on carbon insulation by solution coating using polycarbosilane solution, curing in an oxidizing atmosphere at $200^{\circ}C$, and pyrolysis at temperatures up to $1200^{\circ}C$. The SiOC phase formed during the pyrolysis process was converted into SiC crystals as the heat treatment temperature increased, and a SiC coating with a thickness of 10-15 nm was formed at $1600^{\circ}C$. The SiC coated specimen showed a weight reduction of 8.6 % when it was kept in an atmospheric environment of $700^{\circ}C$ for 1 hour. On the other hand, the thermal conductivity was 0.17 W/mK, and no difference between states before and after coating was observed at all.

Keywords

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