摘要
以硫酸铝铵和碳酸氢铵为原料,采用碳酸铝铵热解和摩擦球化相结合的方法制备球形高纯氧化铝粉体。研究了前驱体碳酸铝铵(AACH)合成过程中反应初始时间、反应体系pH值等因素对AACH球形颗粒形貌的影响,以及AACH焙烧过程中Al_2O_3物相的变化情况。研究表明:反应初始时间过短或过长、反应体系PH值远离AACH等电点均不利于得到球形度好的、粒径大小均一的AACH球形颗粒。研究结果显示:在反应初始时间55 h、反应pH7.0±0.2时制备的前驱体为平均粒径9.42μm、大小均一、松装密度0.49 g/cm^3、安息角38.5°的流动性极好的AACH球形颗粒,经1200℃,30 min焙烧得到平均粒径8.74μm、大小均一、松装密度0.35 g/cm^3、安息角52.3°的球形高纯α-Al_2O_3粉体。
High purity spherical alumina powders were prepared from ammonium aluminum sulfate （NH4Al（SO4）2） and ammonium hydro-carbonate （NH4HCO3） through thermal decomposition of ammonium aluminum carbonate hydroxide （AACH） and friction sphericizing. The effects of the initial reaction time and pH value on AACH particle sphericizing and the alumina （Al2O3） phase transformation in association with calcinating temperatures were studied. Under the optimal synthesis conditions, i. e. the initial reaction time of 55 h, pH value 7.0±0.2, uniform spherical AACH powders were obtained, with the mean diameters 9.42 μm, bulk density 0.49g/cm^3, and angle of repose 38.5°. As AACH was calcined for 30 min at 1200℃, high purity uniform spherical α-Al2O3 powder with the average particle size 8.74μm, bulk density 0.35 g/cm^3, and angle of repose 52.3° was obtained.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2008年第A01期252-255,共4页
Rare Metal Materials and Engineering
关键词
高纯氧化铝
摩擦球化
碳酸铝铵
球形颗粒
high purity alumina
friction sphercizing
ammomium aluminum carbonate
spherical particle
