Oxidation behavior of mullite-coated SiC and SiC/SiC composites under thermal cycling between room temperature and 1200--1400 C
- National Aeronautics and Space Administration, Cleveland, OH (United States). Lewis Research Center
Refractory oxide barrier coatings are a promising approach for improving the environmental durability of silicon-based ceramics in severe environments. The oxidation durability of a newly developed fully crystalline mullite coating on SiC and SiC/SiC composites was investigated under thermal cycling between room temperature and 1,200--1,400 C with a higher frequency (1- or 2-h) and a lower frequency (20-h) cycling for times up to 1,200 h. The new mullite coating exhibited significantly improved adherence and resistance to cracking when compared to conventional mullite coatings. Current issues include oxidation of SiC-based substrates, void formation at the coating/substrate interface, and cracking in the coating through the thickness.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 230733
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 3 Vol. 79; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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