EFFECT OF AGGLOMERATES IN ZRO2 POWDER COMPACTS ON MICROSTRUCTURAL DEVELOPMENT

被引:68
作者
SHI, JL
GAO, JH
LIN, ZX
YAN, DS
机构
[1] Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050
关键词
D O I
10.1007/BF00357805
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Ultrafine zirconia powders were prepared by a coprecipitation and spray-drying method. Agglomerates may be fragmented or present in green bodies after compaction. The effect of agglomerates on sintering and microstructural development was studied and it was found that the agglomerate content in compacts was a major factor affecting the microstructure development and the sintered densities. The interaction between agglomerates themselves, and between agglomerates and the primary particle matrix is discussed. It is argued that the hard agglomerates in the powder from the water-washed coprecipitates are formed by oxo-bridging between non-bridging hydroxyl groups present in the zirconium hydroxide structures due to the effect of hydrogen bonding in the aqueous system. The substitution of organic -OR groups for the non-bridging hydroxyl groups removes this hydrogen-bonding effect between the zirconium hydroxide units and thus eliminates the cause of agglomeration.
引用
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页码:342 / 348
页数:7
相关论文
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