Oxidation protection of porous reaction-bonded silicon nitride | Zendy

Dennis S. Fox | Zendy

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Oxidation protection of porous reaction-bonded silicon nitride

Author(s) -

Dennis S. Fox

Publication year - 1994

Publication title -

journal of materials science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.813

H-Index - 177

eISSN - 1573-4803

pISSN - 0022-2461

DOI - 10.1007/bf00349966

Subject(s) - materials science , thermogravimetry , silicon nitride , coating , kinetics , amorphous solid , nitride , silicon , composite material , chemical engineering , metallurgy , layer (electronics) , crystallography , engineering , chemistry , physics , quantum mechanics

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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