Chapter 51. Gelcasting of Sintered Reaction Bonded Silicon Nitride for Improved Mechanical Properties

  1. John B. Wachtman Jr.
  1. J.-P. Maria,
  2. J. O. Kiggans Jr.,
  3. T. N. Tiegs and
  4. S. D. Nunn

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314784.ch51

Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 16, Issue 5

Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 16, Issue 5

How to Cite

Maria, J.-P., Kiggans, J. O., Tiegs, T. N. and Nunn, S. D. (1995) Gelcasting of Sintered Reaction Bonded Silicon Nitride for Improved Mechanical Properties, in Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 16, Issue 5 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314784.ch51

Author Information

  1. Oak Ridege National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6087

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1995

ISBN Information

Print ISBN: 9780470375389

Online ISBN: 9780470314784

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Keywords:

  • combustion;
  • vibratory;
  • thermal efficiency;
  • preheated;
  • installation

Summary

Gelcasting of silicon metal for the production of sintered reaction bonded silicon nitride (SRBSN), was investigated in order to identify associated advantages over conventional forming techniques; i.e., die and isostatic pressing. Compacts were formed from identical powder mixtures by both gelcasting and pressing, and were nitrided and sintered to produce SRBSN ceramics. Characterization of the samples included measurement of green density, green and nitrided pore structure, weight gain during nitridation, final density, microstructure toughness and flexural strength. It was found that a more uniform pore structure existed in the green gelcast samples. It is believed that this pore configuration aided in nitridation, and manifested itself in a more uniform final microstructure. In addition, improved mechanical properties were achieved in the gelcast samples. This improvement can be attributed to green microslructure homogeneity.