Fracture Behavior of Advanced Ceramic
نویسنده
چکیده
Microstructural, mechanical, and thermal-shock behavior of hot-gas candle fiters obtained from different manufacturers have been evaluated. These filters include both monolithic ceramic and composite materials. Based on the results obtained so far, composite filters perform better than monolithic ceramic filters in a thermal-shock environment. During thermal-shock testing, the monolithic ceramic filters failed in a brittle (catastrophic) mode. while composite filters showed a noncatastrophic mode of failure and very little degradation in ultimate strength. Fractographic evaluations were performed to identify and characterize critical flaws in Nextel fibers for the determination of in-situ fiber strength in Nextel/SiC filters. Average iksitu fiber strength was determined to be 1.7 GPa. Work supported by the U.S. Department of Energy, Office of Fossil Energy, Advanced Research and Technology Materials Program. under Contract W 3 1-109-Erg-38.
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