Chapter 4. Green Testing of Pressed Compacts

  1. John B. Wachtman Jr.
  1. W. J. Walker Jr. and
  2. J. S. Reed

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314272.ch4

A Collection of Papers on Engineering Aspects of Fabrication of Ceramics: Ceramic Engineering and Science Proceedings, Volume 14, Issue 11/12

A Collection of Papers on Engineering Aspects of Fabrication of Ceramics: Ceramic Engineering and Science Proceedings, Volume 14, Issue 11/12

How to Cite

Walker, W. J. and Reed, J. S. (1993) Green Testing of Pressed Compacts, in A Collection of Papers on Engineering Aspects of Fabrication of Ceramics: Ceramic Engineering and Science Proceedings, Volume 14, Issue 11/12 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314272.ch4

Author Information

  1. Alfred University Alfred, NY 14802

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1993

ISBN Information

Print ISBN: 9780470375280

Online ISBN: 9780470314272

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Keywords:

  • pneumatic;
  • polymers;
  • temperatures;
  • microstructure;
  • desiccator

Summary

Green compacts were prepared by pressing spray-dried alumina containing different binders. The diametral compression test was used to measure green tensile strength using a relatively inexpensive pneumatic crush strength tester. Modifications to the strength tester were made to measure the force needed to eject compacts from the die. The ejection pressure was very dependent on die wall lubrication provided by the binder system. Control of relative humidity during testing proved critical for reliable strength data. Green strength of compacts was observed to depend strongly on the joining of pressed granules at interfaces and was less dependent on the intrinsic binder film strength.