| 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 |
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| ABSTRACT |
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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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