Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Effects of $\alpha-AI_2O_3$ Seeding on Phase Formation and Densification Characteristics of Alumina-Mullite-Zirconia Composites

Alumina-Zirconia-Mullite 복합체의 상생성 및 치밀화 특성에 미치는 $\alpha-AI_2O_3$ Seeding 효과

  • 조성목 (포항공과대학 재료공학과 정밀세라믹스 공정과학연구실) ;
  • 장현명 (포항공과대학 재료공학과 정밀세라믹스 공정과학연구실)
  • Published : 1994.12.01
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Abstract

Compositionally triphasic boehmite-silica-zirconia composite gels were prepared by a multiphasic sol-gel route. Phase-formation characteristics and densification behavior of the gel compacts were examined with and without $\alpha$-Al2O3 seeding. In the unseeded triphasic gels, both $\alpha$-Al2O3 and mullite crystallize simultaneously at 130$0^{\circ}C$. On the other hand, the $\alpha$-Al2O3 seeding selectively induces the formation of corundum phase ($\alpha$-Al2O3) at a significantly lower temperature (~110$0^{\circ}C$) and facilitates an epitaxial growth of $\alpha$-Al2O3 between 1100~130$0^{\circ}C$. The densification of alumina-mullite-zirconia composite (derived from the triphasic gels) was also enhanced by the $\alpha$-Al2O3 seeding, and this was attributed to the delayed crystallization of mullite in the $\alpha$-Al2O3 seeded gel.

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