Fracture behavior of chemically-vapor-deposited SiC-coated graphite: Experimental results
- Pennsylvania State Univ., University Park, PA (United States). Dept. of Materials Science and Engineering
CVD SiC coatings on polycrystalline graphite substrates exhibited a crack arrest/multiple cracking phenomenon when fractured in four-point flexure. This fracture behavior appeared to be controlled by the magnitude of the coating thickness. When the coating thickness exceeded [approximately]50 [mu]m, catastrophic failure of the sample was observed. However, when the coating thickness was less than [approximately]50 [mu]m, crack arrest and multiple cracking were observed in the tensile coating surface before catastrophic failure of the composite. In order to understand the fracture behavior of the layered composites, it was necessary to characterize coating thickness and strength as well as the fracture toughness of the substrate and the state of residual stress in the system.
- OSTI ID:
- 5491935
- Journal Information:
- Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 76:12; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
Similar Records
Determination of Young's modulus in chemically vapor-deposited SiC coatings
Fracture toughness of SiC/Al composites
Related Subjects
360601 -- Other Materials-- Preparation & Manufacture
360603* -- Materials-- Properties
CARBIDES
CARBON
CARBON COMPOUNDS
CHEMICAL COATING
CHEMICAL VAPOR DEPOSITION
COATINGS
COMPOSITE MATERIALS
DEPOSITION
ELEMENTAL MINERALS
ELEMENTS
FRACTURE PROPERTIES
GRAPHITE
MATERIALS
MECHANICAL PROPERTIES
MINERALS
NONMETALS
SILICON CARBIDES
SILICON COMPOUNDS
SURFACE COATING
VAPOR DEPOSITED COATINGS