The effect of fiber coatings on interfacial shear strength and the mechanical behavior of ceramic composites
Thin coatings (boron nitride and carbon) 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 at room and elevated temperatures in Nicalon{reg sign} fiber-reinforced/SiC matrix composites. The properties of the fiber-matrix interface in fiber-reinforced ceramic composites have been examined utilizing an indentation method in which a standard microhardness indentor is used to push on fibers embedded in the ceramic matrix. Compositions and microstructures at the interface have been characterized employing analytical electron microscopy. Correlations between interfacial phenomena and observed mechanical behavior have been made. 16 refs., 5 figs., 1 tab.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- Sponsoring Organization:
- DOE/FE
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 7072317
- Report Number(s):
- CONF-891119-100; ON: DE90007574
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
010400 -- Coal
Lignite
& Peat-- Processing
36 MATERIALS SCIENCE
360603* -- Materials-- Properties
BORON COMPOUNDS
BORON NITRIDES
CARBIDES
CARBON
CARBON COMPOUNDS
CERAMICS
COATINGS
COMPOSITE MATERIALS
CRACK PROPAGATION
DEPOSITION
ELEMENTS
FIBERS
FLEXURAL STRENGTH
FRACTURE PROPERTIES
INTERFACES
MATERIALS
MECHANICAL PROPERTIES
NITRIDES
NITROGEN COMPOUNDS
NONMETALS
PNICTIDES
REINFORCED MATERIALS
SILICON CARBIDES
SILICON COMPOUNDS
010400 -- Coal
Lignite
& Peat-- Processing
36 MATERIALS SCIENCE
360603* -- Materials-- Properties
BORON COMPOUNDS
BORON NITRIDES
CARBIDES
CARBON
CARBON COMPOUNDS
CERAMICS
COATINGS
COMPOSITE MATERIALS
CRACK PROPAGATION
DEPOSITION
ELEMENTS
FIBERS
FLEXURAL STRENGTH
FRACTURE PROPERTIES
INTERFACES
MATERIALS
MECHANICAL PROPERTIES
NITRIDES
NITROGEN COMPOUNDS
NONMETALS
PNICTIDES
REINFORCED MATERIALS
SILICON CARBIDES
SILICON COMPOUNDS