Chapter 29. Improved Gelcasting Systems

  1. Ersan Ustundag and
  2. Gary Fischman
  1. Ogbemi O. Omatete1 and
  2. J. J. Nick2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294567.ch29

23rd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures : A: Ceramic Engineering and Science Proceedings, Volume 20, Issue 3

23rd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures : A: Ceramic Engineering and Science Proceedings, Volume 20, Issue 3

How to Cite

Omatete, O. O. and Nick, J. J. (1999) Improved Gelcasting Systems, in 23rd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures : A: Ceramic Engineering and Science Proceedings, Volume 20, Issue 3 (eds E. Ustundag and G. Fischman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294567.ch29

Author Information

  1. 1

    Oak Ridge National Laboratory, Box 2008, Oak Ridge, TN 37831–6087

  2. 2

    Allied Signal Ceramic Components, 2525 W. 190th Street, Torrance CA 90504

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1999

ISBN Information

Print ISBN: 9780470375631

Online ISBN: 9780470294567

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Keywords:

  • methacrylamide;
  • methylene;
  • gelcasting;
  • monofunctional;
  • acrylamide

Summary

A new gelcasting system has been developed and applied successfully to the fabrication of complex shaped Si3N4 parts. The previous process consisted of an aqueous solution of two monomers, a monofunctional monomer, methacrylamide (MAM) that formed the linear polymer and a difunctional monomer, methylene bisacrylamide (MBAM) that crosslinked it thus forming a water-polymer gel. The new system is based on the aqueous solution of a monofunctional monomer, hydroxymethylacrylamide (HMAM), which self-crosslinks and forms a gel. Besides using a single monomer, which is available commercially as an aqueous solution, the system has other advantages that greatly improve the gelcasting process and make the process easier for scaled-up production.