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Oxidation protective barrier coatings for high-temperature polymer matrix composites

Published online by Cambridge University Press:  03 March 2011

David R. Harding
Affiliation:
NASA Lewis Research Center, NYMA, 3001 Aerospace Technology Boulevard, Cleveland, Ohio 44142
James K. Sutter
Affiliation:
NASA Lewis Research Center, 21000 Brookpark Road, Cleveland, Ohio 44135
Marla A. Schuerman
Affiliation:
Xavier University, Cincinnati, Ohio 45207
Elizabeth A. Crane
Affiliation:
John Carroll University, Cleveland, Ohio 44118
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Abstract

Three coating techniques (metal-organic chemical vapor deposition, magnetron sputtering, and plasma-enhanced chemical vapor deposition) were employed to deposit different coating materials (alumina, a superalloy, and silicon nitride) on graphite-fiber-reinforced polyimide composites to protect against oxidation at elevated temperatures. Adhesion and integrity of the coatings were evaluated by isothermal aging (371 °C for 500 h) and thermal cycling (25 to 232 °C for 1000 cycles and −18 to 232 °C for 300 cycles). Best results were achieved with a plasma-deposited, amorphous silicon nitride (a-SiN: H) coating, which withstood stresses from 0.18 to −1.6 GPa. The major factors affecting the suitability of a-SiN: H as an oxidation protective coating are the surface finish of the polymer composite and the presence of a sizable hydrogen content in the coating.

Type
Articles
Copyright
Copyright © Materials Research Society 1994

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