Improvements in mechanical properties in SiC by the addition of TiC particles
Silicon carbide ceramics containing up to 24.6 vol % of dispersed TiC particles yielded fully dense composites by hot pressing at 2000/sup 0/C with 1% Al and 1% C added. The microstructure consists of fine TiC particles in a fine-grained SiC matrix. Addition of TiC particles increases the critical fracture toughness of SiC (to approx. 6 MPa m/sup 1/2/ at 24.6 vol % TiC) and yields high flexure strength (greater than or equal to 680 MPa), with both properties increasing with increasing volume fraction of TiC. The strengths at elevated temperatures are also improved by the TiC additions. Observations of the fracture path indicate that the improved toughness and strength are a result of crack deflection by the TiC particles.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6916339
- Report Number(s):
- CONF-840440-1; ON: DE84012352
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360303* -- Composite Materials-- Mechanical Properties-- (-1987)
CARBIDES
CARBON COMPOUNDS
COMPOSITE MATERIALS
CRACKS
CRYSTAL STRUCTURE
DISPERSION HARDENING
DISPERSIONS
FABRICATION
FLEXURAL STRENGTH
FRACTURE PROPERTIES
HARDENING
HOT PRESSING
MATERIALS
MATERIALS WORKING
MECHANICAL PROPERTIES
MICROSTRUCTURE
PRESSING
SILICON CARBIDES
SILICON COMPOUNDS
TITANIUM CARBIDES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
VERY HIGH TEMPERATURE