以ＺｒＳｉＯ４和α－Ａｌ２Ｏ３为原料，采用反应烧结方法制备了氧化锆－莫来石复相陶瓷 材料．研究了反应烧结过程中致密化和莫来石的形成机制，重点讨论了莫来石晶种的引入对莫 来石形成机制的影响．结果表明，在莫来石形成之前，非晶态的粘滞性流动是主要的致密化机 制．晶种的添加使莫来石的形成方式发生了变化，对反应烧结有一定促进作用．添加 ３ｗｔ％晶 种的试样在１６００℃保温８ｈ相对密度可达９７％左右．
Mullite-zirconia composites were prepared by reaction-sintering of zircon and α-Al2O3 mixed powders. Densification process as well as formation
mechanism of mullite was studied and discussed, and special attention was paid to the effect of mullite seeding on the reaction-sintering mechanisms. It is
shown that the viscous flow of the non-crystalline may be a dominant densification mechanism prior to the formation of mullite. Mullite seeding has an obvious influence
on the forming way of mullite, and a higher relative density of 97% can be obtained when a small amount of mullite seeds (3wt%) are added.
参考文献
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