Fiber coatings for ceramic matrix composites
Two fiber coating concepts for ceramic matrix composites were successfully demonstrated in a preliminary study. These coatings were designed to promote toughness in composites and resist oxidation. The concepts were: (1) thin, multiple unbonded layers, and (2) a single porous layer that provided low interfacial strengths between the fiber and matrix. Chemical vapor deposited (CVD) SiC and sol-gel derived oxides were used to produce the fiber coatings. Specimens consisted of a single coated monofilament fiber and a sheath of CVD SiC to represent the matrix. Results from flexure tests showed that matrix cracks were deflected and that fibers debonded the same as in specimens made using carbon-coated fibers. Crack deflection and fiber debonding were also evident after exposure in air at elevated temperatures. 5 refs.
- OSTI ID:
- 7201725
- Report Number(s):
- CONF-920144--
- Journal Information:
- Ceramic Engineering and Science Proceedings; (United States), Journal Name: Ceramic Engineering and Science Proceedings; (United States) Vol. 13:7-8; ISSN 0196-6219; ISSN CESPD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360601* -- Other Materials-- Preparation & Manufacture
360603 -- Materials-- Properties
CARBIDES
CARBON
CARBON COMPOUNDS
CERAMICS
CHALCOGENIDES
CHEMICAL COATING
CHEMICAL REACTIONS
CHEMICAL VAPOR DEPOSITION
COATINGS
COMPOSITE MATERIALS
CORROSION RESISTANCE
CRACK PROPAGATION
DEFORMATION
DEPOSITION
DIP COATING
DIPPED COATINGS
ELEMENTS
FIBERS
FLEXURAL STRENGTH
FRACTURE PROPERTIES
INTERFACES
MATERIALS
MATRIX MATERIALS
MECHANICAL PROPERTIES
NONMETALS
OPTIMIZATION
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POROSITY
SILICON CARBIDES
SILICON COMPOUNDS
SURFACE COATING
VAPOR DEPOSITED COATINGS