Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Synthesis of \$alpha-Al_2O_3/SiO_2$ Composite Powders for Reaction-Sintered Mullite and its Properties

반응소결 물라이트를 위한 \$alpha-Al_2O_3/SiO_2$ 복합분말의 합성 및 그 특성

  • 김희수 (서울대학교 무기재료공학과) ;
  • 이종국 (조선대학교 재료공학과) ;
  • 김환 (서울대학교 무기재료공학과)
  • Published : 1995.08.01
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Abstract

From alumina powder and TEOS, $\alpha$-Al2O3/SiO2 composite powder for reaction-sintered mullite was synthesized by heterogeneous coagulation and surface coating, and investigated the mullitization reaction and sintering behavor of these powders. In $\alpha$-Al2O3/SiO2 composite powder prepared by heterogeneous coagulation, each alumina particles were surrounded by silica particles of 50~60 nm in size. And the alumina particles in composite powder prepared by surface coating were coated by uniform silica layer with thickness of 50 nm. In both methods, mullitization reaction was completed at 1$650^{\circ}C$ for 3h, and specimen sintered above 145$0^{\circ}C$ was about 95% fo the theoretical relative density. Mullite grains formed from the reaction with composite powders showed spherical shape with a size of 1~2${\mu}{\textrm}{m}$.

Keywords

References

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