Interface effects and fracture in Nicalon/SiC composites
Thin coatings deposited on ceramic fibers prior to densification employing chemical vapor infiltration techniques have been used to limit fiber-matrix bonding. This has resulted in improvements in strength and toughness for Nicalon{reg sign} fiber-reinforced/SiC matrix composites. The properties of the composites are influenced by the thickness of the graphite carbon interlayer. Matrix cracking, work of fracture, and ultimate strength are controlled by the nature of the interface. Interfacial forces were measured utilizing the indentation method in which a standard microhardness indentor is used to push on fibers embedded in the ceramic matrix. Correlations between interfacial phenomena and observed mechanical behavior have been made. 30 refs., 6 figs., 1 tab.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- Sponsoring Organization:
- DOE/FE
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6781998
- Report Number(s):
- CONF-900546-12; ON: DE90012925
- Country of Publication:
- United States
- Language:
- English
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CARBIDES
CARBON
CARBON COMPOUNDS
COATINGS
COMPOSITE MATERIALS
CORRELATIONS
DEPOSITION
DIMENSIONS
ELEMENTS
FABRICATION
FAILURES
FRACTURES
INTERFACES
MATERIALS
MECHANICAL PROPERTIES
NONMETALS
SILICON CARBIDES
SILICON COMPOUNDS
STRESSES
THICKNESS
ULTIMATE STRENGTH