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Journal of Materials Science

, Volume 29, Issue 21, pp 5693–5698 | Cite as

Oxidation protection of porous reaction-bonded silicon nitride

  • D. S. Fox
Papers

Abstract

Oxidation kinetics of both as-fabricated and coated reaction-bonded silicon nitride (RBSN) were studied at 900 and 1000°C with thermogravimetry. Uncoated RBSN exhibited internal oxidation and parabolic kinetics. An amorphous Si-C-0 coating provided the greatest degree of protection to oxygen, with a small linear weight loss observed. Linear weight gains were measured on samples with an amorphous Si-N-C coating. Chemically vapour deposited (CVD) Si3N4 coated RBSN exhibited parabolic kinetics, and the coating cracked severely. A continuous-SiC-fibre-reinforced RBSN composite was also coated with the Si-C-O material, but no substantial oxidation protection was observed.

Keywords

Oxidation Oxygen Polymer Silicon Weight Gain 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • D. S. Fox
    • 1
  1. 1.National Aeronautics and Space AdministrationLewis Research CenterClevelandUSA

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