Improvements in mechanical properties in SiC by the addition of TiC particles
Silicon carbide ceramics containing up to 24.6 vol% dispersed TiC particles yielded fully dense composites by hot-pressing at 2000/sup 0/C with 1 wt% Al and 1 wt% 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 /SUP ./ 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 high 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 Laboratory, Oak Ridge, Tennessee
- OSTI ID:
- 6276569
- Journal Information:
- J. Am. Ceram. Soc.; (United States), Journal Name: J. Am. Ceram. Soc.; (United States) Vol. 67:8; ISSN JACTA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALUMINIUM CARBIDES
ALUMINIUM COMPOUNDS
CARBIDES
CARBON COMPOUNDS
CERAMICS
FABRICATION
FLEXURAL STRENGTH
FRACTURE PROPERTIES
HOT PRESSING
MATERIALS WORKING
MECHANICAL PROPERTIES
OPTIMIZATION
PRESSING
SILICON CARBIDES
SILICON COMPOUNDS
TITANIUM CARBIDES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
VERY HIGH TEMPERATURE