以氢氧化铝为初始原料,通过球磨过程中高纯氧化铝磨介的磨屑作为晶种引入氢氧化铝中.引入的α-Al2O3晶种使氢氧化铝于1100℃×2h的条件下转变为α相氧化铝.而且随着α-Al2O3晶种引入量的增加,煅烧后氧化铝颗粒的平均粒径减小,颗粒尺寸分布均匀.煅烧得到的氧化铝超细粉经热压烧结后,Al2O3晶粒形貌随晶种的引入量的不同而发生变化.未引入α-Al2O3晶种的条件下,晶粒形状主要为等轴状;晶种引入后,晶粒发育成六角片状;而且随着晶种引入量进一步增加时,六角片状晶粒尺寸减小,当晶种数量增加到20wt%以上时,晶粒发育生长为长柱状.
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