Interfacial chemistry-structure and fracture of ceramic composites
Conference
·
OSTI ID:5484371
The interfacial chemistry and structure of SiC/Si/sub 3/N/sub 4/ composites has been evaluated using TEM/STEM and AES. Nicalon SiC fiber reinforced hot-pressed Si/sub 3/N/sub 4/ and VLS single crystal SiC reinforced reaction-bonded silicon nitride (RBSN) have been evaluated. An amorphous carbon-graphite interface structure was observed in the Nicalon SiC fiber-reinforced material resulting from sizing used to assist fiber handling. Fiber pull-out occurred upon fracture of the composite material with the fracture apparently occurring between the amorphous and graphitic carbon layers. The flexure strength of the composite was about 1/3 that of the matrix with the degradation apparently resulting from the development of a glass phase in the grain boundaries of the Nicalon during hot pressing. The interfaces of Si/sub 3/N/sub 4/ matrix composites with C, BN, SiO/sub 2/ coated and untreated VLS whiskers were found to vary markedly. In the RBSN composites, the C was present in the form of a fibrous graphitic structure, the BN coating was nonexistent but large facets had formed on the whiskers while the SiO/sub 2/ coating was present as a discontinuous glass phase. The composite with the SiO/sub 2/ coated whiskers exhibited the highest fracture strength and toughness while the material made with BN-coated whiskers exhibited the lowest values. 4 figs., 1 tab.
- Research Organization:
- Pacific Northwest Lab., Richland, WA (USA); Los Alamos National Lab., NM (USA)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 5484371
- Report Number(s):
- PNL-SA-15269; CONF-880118-1; ON: DE88005516
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360603* -- Materials-- Properties
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
COATINGS
COMPOSITE MATERIALS
CORRELATIONS
CRYSTALS
FIBERS
FLEXURAL STRENGTH
FRACTURE PROPERTIES
INTERFACES
MATERIALS
MECHANICAL PROPERTIES
MINERALS
MONOCRYSTALS
NITRIDES
NITROGEN COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PNICTIDES
REINFORCED MATERIALS
SILICA
SILICON CARBIDES
SILICON COMPOUNDS
SILICON NITRIDES
SILICON OXIDES
WHISKERS
360603* -- Materials-- Properties
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
COATINGS
COMPOSITE MATERIALS
CORRELATIONS
CRYSTALS
FIBERS
FLEXURAL STRENGTH
FRACTURE PROPERTIES
INTERFACES
MATERIALS
MECHANICAL PROPERTIES
MINERALS
MONOCRYSTALS
NITRIDES
NITROGEN COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PNICTIDES
REINFORCED MATERIALS
SILICA
SILICON CARBIDES
SILICON COMPOUNDS
SILICON NITRIDES
SILICON OXIDES
WHISKERS