Title: NDE TECHNIQUES TO EVALUATE THERMAL SHOCK DAMAGE IN CFCC'S

Abstract:
CFCC's have recently shown impressive thermal shock resistance compared to monolithic ceramics. However, they are still susceptible to non-catastrophic damage that can reduce component lifetime. This damage has been shown to consist of both exterior and interior cracking in water quench tests. A variety of NDE techniques including dynamic resonance, resonant ultrasound spectroscopy, water- and air-coupled ultrasound, and thermal diffusivity have been used to detect this thermal shock damage. The advantages and difficulties of each of these techniques for evaluation of thermal shock damage in CFCC's will be discussed. Research sponsored in part by the U.S. DOE Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Transportation Technologies, as part of the High Temperature Materials Laboratory User Program, under contract DE-AC05-840R21400 with Lockheed Martin Energy Systems, Inc.
(Ref. SXVIII-029-97)

Source: NDE of Ceramics '97 May 4-7, Symposium on Nondestructive Evaluation of Ceramics at the American Ceramic Society 99th Annual Meeting, Cincinnati, Ohio.
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