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J. Korean Ceram. Soc. > Volume 50(6); 2013 > Article
Journal of the Korean Ceramic Society 2013;50(6): 364.
doi: https://doi.org/10.4191/kcers.2013.50.6.364
SiC 소결에 미치는 Al2O3-RE2O3 첨가제의 영향과 SiCf/SiC 복합체의 제조
유현우, 카티 라주, 박지연1, 윤당혁
영남대학교 신소재공학부
1한국원자력연구원 원자력재료개발연구본부
Effects of Al2O3-RE2O3 Additive for the Sintering of SiC and the Fabrication of SiCf/SiC Composites
Hyun-Woo Yu, Kati Raju, Ji Yeon Park1, Dang-Hyok Yoon
School of Materials Science and Engineering, Yeungnam University
1Nuclear Materials Division, Korea Atomic Energy Research Institute
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.
Key words: Silicon carbide, Additives, Composites, Hot pressing, Infiltration
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