Effects of Y2O3 addition on the sinterability and microstructure of mullite (part 2) - crystallization of liquid phase and grain growth

Der Yang Fang, Chii Shyang Hwang

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7 Citations (Scopus)

Abstract

The phenomena in the sintering process of Y2O3-added mullite ceramics and the crystallization behavior of liquid phase in sintered bodies were studied using differential thermal analysis, X-ray powder diffractometry, scanning and transmission electron microscopies. The mullite powder compacts containing 2-10 wt% Y2O3 were sintered at 1500°C for 2 h, and were then cooled in furnace or quenched in order to study the crystallization phenomena. During the firing process, a liquid phase containing Y, Al, Si and O components was formed in the sintered body. When the specimen was cooled in furnace, the liquid phase solidified into glassy state or crystallized depending on the amount of Y2O3. The glass phase in the furnace-cooled specimen could also crystallize on annealing. Some crystallization phenomena of the liquid phase were observed. A small α-Al2O3 grain, which was formed by the solid state reaction between mullite and Y2O3 during the firing process, was observed inside a mullite grain. Larger α-Al2O3 grains, which were formed from the solution-reprecipitation process of liquid phase, were observed in the sintered body.

Original languageEnglish
Pages (from-to)331-335
Number of pages5
JournalNippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
Volume101
Issue number1171
DOIs
Publication statusPublished - 1993

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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