Borosilicate Glass-Induced Fiber Degradation of SiC/BN/SiC Composites Exposed in Combustion Environments

Three SiC/BN/SiC composite specimens reinforced with different SiC fibers (Sylramic, Sylramic‐iBN, and Hi‐Nicalon Type S) were exposed in a combustion environment. Exposures were carried out for 151 h in a fuel‐lean high pressure burner rig at 0.9 MPa total pressure, sample temperatures near 1573 K,...

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Bibliographic Details
Published in:International journal of applied ceramic technology 2016-05, Vol.13 (3), p.434-442
Main Authors: Opila, Elizabeth J., Robinson, R. Craig, Verrilli, Michael J.
Format: Article
Language:English
Subjects:
Borosilicate
Ceramics
Combustion
Degradation
Exposure
Fibers
Oxidation
Silicon carbide
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Summary:Three SiC/BN/SiC composite specimens reinforced with different SiC fibers (Sylramic, Sylramic‐iBN, and Hi‐Nicalon Type S) were exposed in a combustion environment. Exposures were carried out for 151 h in a fuel‐lean high pressure burner rig at 0.9 MPa total pressure, sample temperatures near 1573 K, and a gas velocity of 15 m/s. Weight loss of all three composites was observed. Extensive oxidation of SiC fibers was observed in cracked locations. A mechanism based on borosilicate enhanced oxidation coupled with volatilization of boria is described. Ramifications of this degradation mechanism are discussed for long‐term applications of SiC/BN/SiC composites in combustion environments.
ISSN:1546-542X
1744-7402
DOI:10.1111/ijac.12499