沉淀法制备超细氧化铝粉末过程中的团聚机理和消除办法  

Mechanism of Aggregation and Methods of Eliminate During Superfine Al_2O_3 Synthesis by Precipitation Method

作　　者：邹惠静[1] 尹良果 

机构地区：[1]南阳医学高等专科学校公共教学部 [2]中国核电工程有限公司郑州分公司,郑州市中原东路96号450052

出　　处：《光谱实验室》2010年第4期1633-1639,共7页Chinese Journal of Spectroscopy Laboratory

摘　　要：采用沉淀法以Al(NO3)3.9H2O和NH3.H2O为原料制备了Al(OH)3干凝胶,经过高温煅烧合成纳米级的α-Al2O3粉末,分析了在制备过程中氧化铝粉末产生团聚的机理,推测了硬团聚的机理模型,并提出了几种消除硬团聚的方法,制备出的α-Al2O3粉末,粒径分布均匀,且无明显团聚,近似球形,平均粒径为70nm。α-Al2O3 nanocrystalline powders were synthesized by calcining the dry Al（OH）3 gels which were prepared from aluminum nitrate and ammonia solution by precipitation method.The mechanism of aggregation during the process of preparation was described as hardened agglomeration,and some methods for aggregation elimination were suggested.The obtained α-Al2O3 powder has no obvious agglomeration,narrow particle size distribution,spherical shape,with a mean particle size of 70nm.

关 键 词：超细氧化铝 硬团聚 架桥羟基 

分 类 号：O657.61[理学—分析化学]