Effect of Coating on the Fiber and Reaction Sintering Atmosphere on Mechanical Properties of SiC Fiber Reinforced RBSC Composites

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J. Korean Ceram. Soc. > Volume 36(8); 1999 > Article

Journal of the Korean Ceramic Society 1999;36(8): 805.

섬유 표면 코팅 및 침윤 분위기가 탄화규소 섬유 강화 반응소결 탄화규소 복합재료의 기계적 특성에 미치는 영향

박용국, 박상환¹, 최성철

한양대학교 무기재료공학과
¹한국과학기술연구원 복합기능 세라믹스 연구센터

Effect of Coating on the Fiber and Reaction Sintering Atmosphere on Mechanical Properties of SiC Fiber Reinforced RBSC Composites

ABSTRACT

For SCS-6 SiCf/RBSC composites fabricated by the Si melt infiltration in vacuum atmosphere it was found that the coating layer on SiC fiber direcly affected the interfacial reaction between fiber and matrix as well as the mechanical properties of composites. SiC/C double coating layer on SiC fiber was found to be most effective to improve the fracture toughness of SiCf/RBSC composites byminimizing the interfacial reaction between fiber and molten Si,. The maximum fracture strength and toughness of 25vol% SiCf/RBSC composites fabricated in vacuum was 540 MPa and 12.4MPa$.$m1/2 respectively. However for the composites fabricated by the Sil melt infigtration in Ar atmosphere it was found that any type of coating layer on SiC fiber could not reacted the interfacial reaction between fiber and molten Si due to the oxidation of the applied coating layer

Key words: SiC fiber, Reaction bonded SiC, Coating layer, Composites, interfacial reaction