Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Impregnation Behavior of SiCf/SiC Composites Depending on the Polycarbosilane Precursor and Solvent

폴리카보실란의 종류와 용제에 따른 SiCf/SiC복합재의 충진 거동

  • 김선한 (한국원자력연구원, 경수로핵연료기술개발부) ;
  • 정양일 (한국원자력연구원, 경수로핵연료기술개발부) ;
  • 박정용 (한국원자력연구원, 경수로핵연료기술개발부) ;
  • 김현길 (한국원자력연구원, 경수로핵연료기술개발부) ;
  • 구양현 (한국원자력연구원, 경수로핵연료기술개발부) ;
  • 홍순익 (충남대학교, 에너지기능재료 Lab.)
  • Received : 2014.04.22
  • Accepted : 2014.08.11
  • Published : 2014.09.27
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Abstract

Process conditions for the impregnation of polycarbosilane preceramic polymer into SiC-based composites were investigated. Two kinds of preceramic polymer (PCP) was impregnated into SiC-fiber fabrics with different solvents of n-hexane and divinylbenzene (DVB). Both microstructural observations and mechanical tests were conducted to evaluate the impregnation. The matrix phases were particulated in the case of hexane solvents. Apparent relative density of the matrix was about 78.8%. The density of matrix was increased to about 96.1-98.8% when the DVB was used; however, brittle fracture was observed during a bending test. The modulus of toughness was less than $0.74J/m^3$. The fabric impregnated with a mixed PCP-dissolved solution showed intermediate characteristics with relative high density of filling (apparent density of ~96.1%) as well as proper bending behavior. The modulus of toughness was increased to about $5.31J/m^3$. The composites developed by changing the precursor and solvent suggested the possibility of fabricating SiCf/SiC composites without a fiber to matrix interphase coating.

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