摘要
在碳酸铝铵法制备氧化铝工艺的基础上,通过加入晶体生长促进剂及改变热分解工艺等方法,有效控制了α-Al2O3颗粒的大小和形貌。结果表明:促进剂对α-Al2O3的相变过程影响很大,加入促进剂后使其相转变温度降低了200℃,至1000℃时已完全转变为α-Al2O3相;升温方式对α-A2lO3颗粒的形貌影响很大,将含促进剂的样品直接入高温炉煅烧时,倾向于形成六角片状颗粒;而先低温后高温煅烧时则会形成圆饼状颗粒。通过控制升温过程,可以控制得到粒径较小的圆饼状α-Al2O3颗粒,且分散性良好。
α-Al2O3 powder was prepared by crystalline atnmonium aluminum carbonate hydroxide （AACH） method, and particle size and shape of α-Al2O3 were controlled by adding crystal growing accelerant and changing the calcination process. The results showed that, the accelerant played a very important role of the phase transformation process and the particle size and shape of α-Al2O3 , the phase transformation temperature of α-Al2O3 was lowered about 200℃, complete α-Al2O3 phase was achieved while calcination temperature over 1000℃. The well dispersed cake-like Al2O3 particles with small particle size can be synthesized through a two-step calcination process, while hexagonal flakey particles will be caused by directly high temperature calcinations.
出处
《中国粉体技术》
CAS
2005年第6期6-8,共3页
China Powder Science and Technology
基金
江苏省高技术项目资助
编号:BG2002024
关键词
碳酸铝铵
氧化铝
促进剂
粒径
ammonium aluminum carbonate hydroxide
alumina
accelerant
particle size
