DIRECT OBSERVATION OF NONUNIFORM DISTRIBUTION OF PVA BINDER IN ALUMINA GREEN BODY

被引:34
作者
ZHANG, Y
UCHIDA, N
UEMATSU, K
机构
[1] Department of Chemistry, Nagaoka University of Technology, Niigata, Kamitomioka 1603-1, Nagaoka
关键词
D O I
10.1007/BF00356144
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
To study the effect of binder distribution in a powder granule on the internal structure of the compacts, the internal structure of green bodies with various PVA contents was examined by a liquid immersion technique and SEM, By the liquid immersion technique, a dark three-dimensional network was found in the as-compacted green bodies, but disappeared after binder removal. This result shows that the structure corresponds to binder-rich surface layer of the spray-dried granule. Detailed examination on green bodies after the binder removal showed that the low density region was present at the boundaries of granules and was related to the binder-rich region. The voids between granules increase with increasing the PVA content.
引用
收藏
页码:1357 / 1360
页数:4
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