氧化锆超细粉末二次团聚状态的控制

来源期刊：中南大学学报(自然科学版)1993年第2期

论文作者：葛荣德 赵天从 朱宣惠

文章页码：199 - 204

关键词：共沉淀; 氧化锆; 超细粉末; 团聚

Key words：coprecipitation; zirconia; ultrafine powder; agglomeration

摘    要：研究了共沉淀法制备氧化锆超细粉末过程中团聚体的形成机理及其团聚状态的控制。结果表明,氧化锆超细粉末以二次团聚体形式存在,粉末的二次团聚结构在凝胶制备过程中就已形成。其中,一次团聚体在氢氧化锆沉淀过程中形成,二次团聚体在凝胶干燥过程中形成。在凝胶制备过程中加入高分子表面活性剂可有效地控制粉末的一次团聚状态和二次团聚状态。而采用乙醇脱水工艺只能控制粉末的二次团聚状态,对一次团聚状态影响不大。文中还讨论了粉末团聚状态与粉末物理性能参数的关系。

Abstract: The mechanism of agglomerate formation during preparing ultrafine zirconia powders by coprecipitation and the control of the state of agglomeration have been investigated.It has been shown that the prepared ultrafine zirconia powders have twolevel agglomeration structure in which the first level is formed during colloidal precipitation and the second level is formed during gel drying. The agglomeration structures of both levels can be controlled bysing macromolecular surfactants during the preparation of zirconium hydroxide gels. Alcohol ehydration can influence the state of the second-level agglomeration but has little influnce n that of the first-level one.The effect of the state of agglomeration on physicalproperties f he powders has also been discussed.