Journal of Materials Science

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

Oxidation protection of porous reaction-bonded silicon nitride

  • D. S. Fox


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.


Oxidation Oxygen Polymer Silicon Weight Gain 
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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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