Effect of SiC Dispersion of $\beta$-Sialon Prepared from Wando Pyrophylite

완도납석으로부터 제조한 $\beta$-Sialon에 대한 SiC의 복합화 효과

  • 이홍림 (연세대학교 요업공학과) ;
  • 김신 (연세대학교 요업공학과) ;
  • 이형직 (현대자동차주식회사 연구소)
  • Published : 1988.03.01


$\beta$-Sialon powder was prepared by the reduction-nitridation reaction from the mixture of Wando Pyrophyllite and carbon black at 135$0^{\circ}C$ in $N_2$ atmosphere. $\beta$-SiC powder was added to the prepared $\beta$-Sialon powder to make $\beta$-Sialon-SiC composite. The $\beta$-Sialon-SiC composites were sintered pressurelessly at 175$0^{\circ}C$ for 2h, using $Y_2O_3$ and $ZrO_2$(monoclinic) as sintering aids. Comparatively higher values of the fracture toughness (3.8 MN/㎥/2), M.O.R. (470 MN/$m^2$) and vickers microhardness (13.7 MN/$m^2$) were obtained when 10 wt% $Y_2O_3$ was added as a sintering aid. The improved fracture toughness and M.O.R. are assumed to be the results of crack deflection and crack branching by the second phase SiC particles.



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