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Journal of Materials Science

, Volume 30, Issue 5, pp 1357–1360 | Cite as

Direct observation of non-uniform distribution of PVA binder in alumina green body

  • Y. Zhang
  • N. Uchida
  • K. Uematsu
Papers

Abstract

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.

Keywords

Polymer Alumina Surface Layer Internal Structure Direct Observation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1995

Authors and Affiliations

  • Y. Zhang
    • 1
  • N. Uchida
    • 1
  • K. Uematsu
    • 1
  1. 1.Department of ChemistryNagaoka University of TechnologyNiigataJapan

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