High-temperature mechanical properties of a uniaxially reinforced zircon-silicon carbide composite
- General Electric Co., Schenectady, NY (USA). Corporate Research and Development Center
This paper reports that mechanical properties of a monolithic zircon ceramic and zircon-matrix composites uniaxially reinforced with either uncoated or BN-coated silicon carbide monofilaments were measured in flexure between 25{degrees} and 1477{degrees}C. Monolithic zircon ceramics were weak and exhibited a brittle failure up to abut 1300{degrees}C. An increasing amount of the plastic deformation was observed before failure above about 1300{degrees}C. In contrast, composites reinforced with either uncoated or BN-coated Sic filaments were stronger and tougher than the monolithic zircon at all test temperatures between 25{degrees} and 1477{degrees}. The ultimate strength and work-of-fracture of composite samples decreased with increasing temperature. A transgranular matrix fracture was shown by the monolithic and composite samples tested up to about 1200{degrees}C, whereas an increasing amount of the intergranular matrix fracture was displayed above 1200{degrees}C.
- OSTI ID:
- 5854733
- Journal Information:
- Journal of the American Ceramic Society; (USA), Vol. 73:8; ISSN 0002-7820
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
REINFORCED MATERIALS
FLEXURAL STRENGTH
SILICON CARBIDES
BORON NITRIDES
FILAMENTS
HIGH-TC SUPERCONDUCTORS
SUPERCONDUCTING COMPOSITES
TEMPERATURE DEPENDENCE
ZIRCONIUM COMPOUNDS
BORON COMPOUNDS
CARBIDES
CARBON COMPOUNDS
COMPOSITE MATERIALS
MATERIALS
MECHANICAL PROPERTIES
NITRIDES
NITROGEN COMPOUNDS
PNICTIDES
SILICON COMPOUNDS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
360203* - Ceramics
Cermets
& Refractories- Mechanical Properties
360204 - Ceramics
Cermets
& Refractories- Physical Properties