Thermomechanical Performance of Si-Ti-C-O and Sintered SiC Fiber-Bonded Ceramics at High Temperatures
- ORNL
- NASA-Glenn Research Center, Cleveland
- Ube Industries, Ltd.
The stress-temperature-lifetime response of Si-Ti-C-O fiber-bonded ceramic (Tyrannohex ) and sintered SiC fiber-bonded ceramic (SA-Tyrannohex ) materials were investigated in air from 500 to 1150 C and 500 to 1400 C, respectively. The apparent threshold stress of Si-Ti-C-O fiber-bonded ceramic was about 175 MPa in the 500-1150 C temperature range. When the applied stress of the sintered SiC fiber-bonded ceramic was below an apparent threshold stress (e.g., ~225MPa) for tests conducted 1150 C, no failures were observed for lifetimes up to 1000h. In the case of sintered SiC fiber-bonded ceramic, at the temperature of 1300 C, the apparent threshold stress decreased to 175 MPa. The decrease in strength seemed to be caused by grain growth which was confirmed from the SEM fractography. Both fiber-bonded ceramics exhibited much higher durability than a commercial SiC/SiC composite at temperatures above 500 C. In addition, results suggested that the sintered SiC fiber-bonded ceramic (SA-Tyrannohex) is more stable than a Hi-Nicalon/MI SiC composite with BN/SiC fiber coating at temperatures above 1300 C.
- Research Organization:
- Oak Ridge National Laboratory (ORNL)
- Sponsoring Organization:
- ORNL work for others
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1024238
- Journal Information:
- International Journal of Applied Ceramic Technology, Journal Name: International Journal of Applied Ceramic Technology Journal Issue: 2 Vol. 8; ISSN 1546-542X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AIR
CERAMICS
COATINGS
COMPOSITE MATERIALS
Ceramic Matrix Composites
FIBERS
FRACTOGRAPHY
Fiber Bonded Ceramic
Fractography
GRAIN GROWTH
High-Temperature Properties
PERFORMANCE
REINFORCED MATERIALS
SILICON CARBIDES
Strength
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K