| 氧化锆超细粉末二次团聚状态的控制 |
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| 引用本文： | 葛荣德,赵天从,朱宣惠. 氧化锆超细粉末二次团聚状态的控制[J]. 中南大学学报(自然科学版), 1993, 0(2) |
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| 作者姓名： | 葛荣德 赵天从 朱宣惠 |
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| 作者单位： | 中南工业大学，中南工业大学，天津大学 |
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| 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。
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| 关 键 词： | 共沉淀 氧化锆 超细粉末 团聚 |
CONTROL OF THE STATE OF TWO-LEVEL AGGLOMERATION OF ULTRAFINE ZIRCONIA POWDERS |
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| Ge Rongde,Zhao Tiancong Central South University of TechnologyZhu Xuanhue Tianjin University. CONTROL OF THE STATE OF TWO-LEVEL AGGLOMERATION OF ULTRAFINE ZIRCONIA POWDERS[J]. Journal of Central South University:Science and Technology, 1993, 0(2) |
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| Authors: | Ge Rongde Zhao Tiancong Central South University of TechnologyZhu Xuanhue Tianjin University |
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| Affiliation: | Ge Rongde;Zhao Tiancong Central South University of TechnologyZhu Xuanhue Tianjin University |
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| 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 hasbeen shown that the prepared ultrafine zirconia powders have two-level agglomeration struc-ture in which the first level is formed during colloidal precipitation and the second level isformed during gel drying.The agglomeration structures of both levels can be controlled bysing macromolecular surfactants during the preparation of zirconium hydroxide gels.Alco-hol ehydration can influence the state of the second-level agglomeration but has little influ-nce n that of the first-level one.The effect of the state of agglomeration on physicalproperties f he powders has also been discussed. |
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| Keywords: | coprecipitation zirconia ultrafine powder agglomeration |
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