Chapter 63. High Temperature Mechanical Properties of Phosphate Bonded Ceramics

  1. John B. Wachtman Jr
  1. C. A. Martin and
  2. I. G. Talmy

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314715.ch63

Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 16, Issue 4

Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 16, Issue 4

How to Cite

Martin, C. A. and Talmy, I. G. (1995) High Temperature Mechanical Properties of Phosphate Bonded Ceramics, in Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 16, Issue 4 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314715.ch63

Author Information

  1. Naval Surface Warfare Center Carderock Division, White Oak Site Silver Spring, MD 20903-5640

Publication History

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

ISBN Information

Print ISBN: 9780470375372

Online ISBN: 9780470314715

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Keywords:

  • silicon nitride;
  • ceramics;
  • binders;
  • thermomechanical;
  • electromagnetic

Summary

Silicon nitride, aluminum nitride, alumina, and zirconia ceramics have been developed using Al-, Si-, and Zr phosphate binders. The thermomechanical properties of the materials were characterized. The room temperature flexural strength of the phosphate bonded ceramics ranged from 40 to 120 MPa. Plasticity was observed in silicon nitride based materials at temperatures above 800°C due to softening of silicon phosphate. Aluminum nitride, alumina, and zirconia based materials did not soften up to 1000 °C. Coefficient of thermal expansion ranged from 1.8 to 5.5 + 10−6/0C (25–850°C) for silicon nitride based materials. Phosphate bonding techniques offer a low-cost, net-shape processing alternative. While not as strong as conventionally processed ceramics, phosphate bonded ceramics are suitable for numerous applications such as electromagnetic windows, electrical components, and certain engine applications such as exhaust components.