以工业氢氧化铝为原料,采用引入添加剂的直接煅烧分解法制备出α-Al2O3纳米粉.制粉过程中,在氢氧化铝粉料中加入不同量的相变添加剂ZnF2、AlF3和纳米α-Al2O3晶种,在球磨罐中球磨3 h,所得粉料分别于800 ℃、900 ℃、950 ℃、1000 ℃煅烧1 h、1.5 h、2 h,并将制得的α-Al2O3粉体配制成固相体积分数为15%的悬浮液,加入分散剂并调节pH值=8进行分散处理,再将该悬浮液进行离心分离,使纳米粉被逐步地分级与分离出来.结果表明:向Al(OH)3粉料中加入1%ZnF2+1%晶种或3%AlF3+1%晶种,降低了相变温度,从而在950 ℃煅烧1 h后即可得到晶粒度分别为32 nm和37 nm的α-Al2O3纳米粉.所制粉体经分散、离心处理后,二次粒度为168 nm;TEM观察表明α-Al2O3颗粒呈分散良好的不规则形貌.
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