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Fracture Behaviors of SiCf/SiC Composites Prepared by Hybrid Processes of CVI and PIP

화학침착법과 고분자함침 열분해법의 복합공정으로 제조한 SiCf/SiC 복합체의 제조 공정에 따른 파괴거동

  • Park, Ji Yeon (Nuclear Materials Development Division, Korea Atomic Energy Research Institute) ;
  • Han, Jangwon (Nuclear Materials Development Division, Korea Atomic Energy Research Institute) ;
  • Kim, Daejong (Nuclear Materials Development Division, Korea Atomic Energy Research Institute) ;
  • Kim, Weon-Ju (Nuclear Materials Development Division, Korea Atomic Energy Research Institute) ;
  • Lee, Sea Hoon (Department of Engineering Ceramics, Korea Institute of Materials Science)
  • 박지연 (한국원자력연구원 원자력소재개발부) ;
  • 한장원 (한국원자력연구원 원자력소재개발부) ;
  • 김대종 (한국원자력연구원 원자력소재개발부) ;
  • 김원주 (한국원자력연구원 원자력소재개발부) ;
  • 이세훈 (재료연구소 엔지니어링세라믹스부)
  • Received : 2014.07.31
  • Accepted : 2014.09.11
  • Published : 2014.09.30

Abstract

$SiC_f$/SiC composites were prepared using the hybrid process of chemical vapor infiltration (CVI) and polymer impregnation and pyrolysis (PIP). Before the application of PIP, partially matrix-filled preform composites with different densities were fabricated by control of chemical vapor infiltration time and temperature. The changes of the final density of the $SiC_f$/SiC composites had a tendency similar to that of preform composites partially filled by CVI. Composites with lower density after the CVI process had a larger increment of density during the PIP process. Three types of microstructures were observed on the fractured surface of the composite: 1) well pulled-out fibers and lower density, 2) slightly pulled-out fibers and higher density, and 3) only bulk SiC. The different fractions and distributions of the microstructures could have an effect on the mechanical properties of the composites. In this study, $SiC_f$/SiC composites prepared using a hybrid process of CVI and PIP had density values in the range of $1.05{\sim}1.44g/cm^3$, tensile strength values in the range of 76.4 ~ 130.7 MPa, and fracture toughness values in the range of $11.2{\sim}13.5MPa{\cdot}m^{1/2}$.

Acknowledgement

Supported by : 한국산업기술평가관리원

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