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http://dx.doi.org/10.4191/kcers.2013.50.6.364

Effects of Al2O3-RE2O3 Additive for the Sintering of SiC and the Fabrication of SiCf/SiC Composites  

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)
Publication Information
Journal of the Korean Ceramic Society / v.50, no.6, 2013 , pp. 364-371 More about this Journal
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
Silicon carbide; Additives; Composites; Hot pressing; Infiltration;
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Times Cited By KSCI : 1  (Citation Analysis)
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