Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Effects of Al2O3-RE2O3 Additive for the Sintering of SiC and the Fabrication of SiCf/SiC Composites

SiC 소결에 미치는 Al2O3-RE2O3 첨가제의 영향과 SiCf/SiC 복합체의 제조

  • Yu, Hyun-Woo (School of Materials Science and Engineering, Yeungnam University) ;
  • Raju, Kati (School of Materials Science and Engineering, Yeungnam University) ;
  • Park, Ji Yeon (Nuclear Materials Division, Korea Atomic Energy Research Institute) ;
  • Yoon, Dang-Hyok (School of Materials Science and Engineering, Yeungnam University)
  • 유현우 (영남대학교 신소재공학부) ;
  • 카티 라주 (영남대학교 신소재공학부) ;
  • 박지연 (한국원자력연구원 원자력재료개발연구본부) ;
  • 윤당혁 (영남대학교 신소재공학부)
  • Received : 2013.09.17
  • Accepted : 2013.10.10
  • Published : 2013.11.30
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Abstract

The sintering behavior of monolithic SiC is examined using the binary sintering additive of $Al_2O_3$-rare earth oxide ($RE_2O_3$, where RE = Sc, Nd, Dy, Ho, or Yb). Through hot pressing at 20 MPa and $1750^{\circ}C$ for 1 h in an Ar atmosphere for 52 nm fine ${\beta}$-SiC powder added with 5 wt% sintering additive, a SiC density of > 97% is achieved, which indicates the effectiveness of $Al_2O_3-RE_2O_3$ system as a sintering of additive for SiC. Based on this result, 7 wt% of $Al_2O_3-Sc_2O_3$ is tested as an additive system for the fabrication of a continuous SiC fiber-reinforced SiC-matrix composite ($SiC_f$/SiC). Electrophoretic deposition combined with the application of ultrasonic pulses is used to efficiently infiltrate the matrix phase into the voids of $Tyranno^{TM}$-SA3 fabric. After hot pressing, a composite density of > 97% is obtained, along with a maximum flexural strength of 443 MPa.

Keywords

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