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Oxidation protection of porous reaction-bonded silicon nitride

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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.

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  1. National Aeronautics and Space Administration, Lewis Research Center, 44135, Cleveland, OH, USA

    D. S. Fox

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  1. D. S. Fox
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Fox, D.S. Oxidation protection of porous reaction-bonded silicon nitride. JOURNAL OF MATERIALS SCIENCE 29, 5693–5698 (1994). https://doi.org/10.1007/BF00349966

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  • DOI: https://doi.org/10.1007/BF00349966

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