The Korean Journal of Ceramics

The Korean Ceramic Society (한국세라믹학회)
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Effect of Large $\alpha$-Silicon Carbide Seed Grains on Microstructure and Fracture Toughness of Pressureless-Sintered $\alpha$-Silicon Carbide

  • Young-Wook Kim (Department of Materials Science and Engineering, Seoul City University) ;
  • Kyeong Sik Cho (Division of Ceramics, Korea Institute of Science and Technology) ;
  • June-Gunn Lee (Division of Ceramics, Korea Institute of Science and Technology)
  • Published : 1996.03.01
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Abstract

${\alpha}-SiC$ powder with or without the addition of 0.1 wt% of large ${\alpha}-SiC$ partices(seeds) was pressureless-sintered at $1950^{\circ}C$ for 0.5, 2, and 4 h using $Y_3Al_5 O_{12}$ (yttrium aluminum garnet, YAG) as a sintering aid. The materials without seeds had an equiaxed grain struture. In contrast, the materials with seeds sintered for 2 and 4 h had a duplex microstructure with large elongated grains and amall equiaxed grains. Addition of large ${\alpha}-SiC$ seeds into ${\alpha}-SiC$ accelerated the grain growth of some ${\alpha}-SiC$ grains during sintering and resulted in the increased fracture toughness of the sintered materials. The fracture toughnesses of materials with or without seeds sintered for 4 h were 6.6 and $5.2 MPa \;m^{12}$, respectively.

Keywords

References

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