75. Formation of Environmental Barrier Coating on SI3N4 by Gas-Pressure Sintering

  1. Edgar Lara-Curzio and
  2. Michael J. Readey
  1. D. Doni Jayaseelan,
  2. S. Ueno,
  3. N. Kondo,
  4. T. Ohji and
  5. S. Kanzaki

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291191.ch75

28th International Conference on Advanced Ceramics and Composites B: Ceramic Engineering and Science Proceedings, Volume 25, Issue 4

28th International Conference on Advanced Ceramics and Composites B: Ceramic Engineering and Science Proceedings, Volume 25, Issue 4

How to Cite

Jayaseelan, D. D., Ueno, S., Kondo, N., Ohji, T. and Kanzaki, S. (2004) Formation of Environmental Barrier Coating on SI3N4 by Gas-Pressure Sintering, in 28th International Conference on Advanced Ceramics and Composites B: Ceramic Engineering and Science Proceedings, Volume 25, Issue 4 (eds E. Lara-Curzio and M. J. Readey), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291191.ch75

Author Information

  1. Synergy Materials Research Center National Institute of Advanced Industrial Science and Technology Moriyama-ku Nagoya - 463 8687, Japan

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2004

ISBN Information

Print ISBN: 9780470051528

Online ISBN: 9780470291191

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Keywords:

  • hydroxyapatite;
  • human enamel;
  • hydroxyapatite crystals;
  • synchrotron radiation difiaction;
  • dentine-enamel-junction

Summary

An easy processing technique was employed to form environmental barrier coating on silicon nitride ceramics by gas-pressure sintering. In this process, an amorphous silica layer was formed first on silicon nitride specimen by controlled oxidation and then the oxidized specimen was placed inside powder bed during gas pressure sintering for the formation of dense oxide coating by reaction sintering. Different powder beds were used for respective oxide coating on silicon nitride ceramics. The thickness of coating depends on the thickness of the oxide layer formed. The specimens were characterized and discussed in detail. As low cost method, specimens of any complicated shape can be coated by this novel oxidation reaction sintering technique.