Chapter 24. Green Machining of Gelcast Ceramic Materlals

  1. John B. Wachtman Jr.
  1. Stephen D. Nunn and
  2. Glen H. Kirby

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314821.ch24

Proceedings of the 20th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 17, Issue 3

Proceedings of the 20th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 17, Issue 3

How to Cite

Nunn, S. D. and Kirby, G. H. (1996) Green Machining of Gelcast Ceramic Materlals, in Proceedings of the 20th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 17, Issue 3 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314821.ch24

Author Information

  1. Oak Ridge National Laboratory, Oak Ridge, TN 37831–6087

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1996

ISBN Information

Print ISBN: 9780470375426

Online ISBN: 9780470314821

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Keywords:

  • gelcasting;
  • characteristics;
  • polymerizable;
  • distortion;
  • ceramics

Summary

Ceramic green bodies prepared by gelcasting were shown to be readily machinable using WC cutting tools. Samples of alumina and silicon nitride were examined. It was found that a gelcasting formulation which uses a high molecular weight cross-linking agent produces a green body having superior machining characteristics. Samples fabricated with a lower molecular weight cross-linker exhibited a poor machined surface finish due to chipping. Cutting speed tests showed that for machining a flat-bottomed groove 3.2 mm wide and 9.5 mm deep (0.125 – 0.375 in.) using three passes, rates of 0.85–6.35 cm/sec (0.33–2.50 in./sec.) could be used without damaging the sample.