ムライトの焼結及び微構造に及ぼすY_2O_3添加の影響(第2報) : 液相の結晶化と粒子成長

概要

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The phenomena in the sintering process of Y_2O_3-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% Y_2O_3 were sintered at 1500℃ 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 Y_2O_3. 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-Al_2O_3 grain, which was formed by the solid state reaction between mullite and Y_2O_3 during the firing process, was observed inside a mullite grain. Larger α-Al_2O_3 grains, which were formed from the solution-reprecipitation process of liquid phase, were observed in the sintered body.
社団法人日本セラミックス協会の論文
1993-03-01