Intermediate temperature oxidative strength degradation of a SiC/SiNC composite with a polymer‐derived matrix

The article describes an experimental investigation of oxidative degradation in mechanical performance of a SiC fiber‐reinforced composite with a SiCN matrix produced by polymer infiltration and pyrolysis. Tensile stress rupture and retained strength tests were performed at 800°C in dry air and in w...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2017-04, Vol.100 (4), p.1606-1617
Main Authors: Poerschke, David L., Rossol, Michael N., Zok, Frank W.
Format: Article
Language:English
Subjects:
ceramic matrix composites
Ceramics
Degradation
Drying
Fibers
Infiltration
Oxidation
Polymers
Silicon carbide
Strength
Temperature
Water vapor
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Summary:The article describes an experimental investigation of oxidative degradation in mechanical performance of a SiC fiber‐reinforced composite with a SiCN matrix produced by polymer infiltration and pyrolysis. Tensile stress rupture and retained strength tests were performed at 800°C in dry air and in water vapor. Fracture surfaces were examined to determine the degree of fiber pull‐out and constituent oxidation and to measure radii of representative fiber fracture mirrors. The results indicate that degradation in tows adjacent to cut surfaces occurs equally rapidly in water vapor with or without application of stress; regions in the composite interior and near as‐processed (uncut) surfaces appear far less affected. Similar effects are evident but less pronounced in dry air. Although oxidation of fiber coatings is observed in some cases, collectively the results suggest that fiber degradation is the main mechanism leading to reduced composite strength.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.14741