| 碳酸铝铵法制备圆饼状α-Al_2O_3粉末 |
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| 引用本文： | 董岩,蒋建清,吴直森,梁步青,刘凯,于金.碳酸铝铵法制备圆饼状α-Al_2O_3粉末[J].中国粉体技术,2005,11(6):6-8. |
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| 作者姓名： | 董岩 蒋建清 吴直森 梁步青 刘凯 于金 |
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| 作者单位： | 东南大学,材料科学与工程系,江苏,南京,210096 |
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| 基金项目： | 江苏省高技术项目资助,编号：BG2002024. |
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| 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。
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| 关 键 词： | 碳酸铝铵 氧化铝 促进剂 粒径 |
| 文章编号： | 1008-5548（2005）06-0006-03 |
| 收稿时间： | 2005-06-01 |
| 修稿时间： | 2005年6月1日 |
Preparation of Disperse Cake-like α-Al2O3 Powder by AACH Method |
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| DONG Yan,JIANG Jian-qing,WU Zhi-sen,LIANG Bu-qing,LIU Kai,YU Jin.Preparation of Disperse Cake-like α-Al2O3 Powder by AACH Method[J].China Powder Science and Technology,2005,11(6):6-8. |
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| Authors: | DONG Yan JIANG Jian-qing WU Zhi-sen LIANG Bu-qing LIU Kai YU Jin |
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| Affiliation: | Department of Material Science and Engineering, Southeast University, Nanjing, 210096, China |
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| Abstract: | α-Al2O3 powder was prepared by crystalline ammonium 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. |
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| Keywords: | ammonium aluminum carbonate hydroxide alumina accelerant particle size |
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