Ajs20 , the precursor contained 20wt % alunina sol seeding , was calcined at around 1000 to get free - aggregation nano - sized a - alaos powders with a median particle size of 70nm . and , calcining ajs2 , the precursor contained 2wt % alumina sol seeding , at hoo ' c , we get a - alaos nano - sized powders with a particle size of loonm and good dispersion by tem . this paper also gives the proper mechanisms of these factors " influences on the transformation to alpha phase 研究結(jié)果顯示,含有20wt膠體籽晶的前驅(qū)體ajs20在1000左右煅燒就可獲得平均粒徑為70nm 、無團聚的納米- al _ 2o _ 3粉體;而含有2wt膠體籽晶的前驅(qū)體ajs2在1100即可獲得粒徑在100nm左右、幾乎單顆粒分散、有少量“樹枝狀”微結(jié)構(gòu)的納米- al _ 2o _ 3粉體。