Development and Characterization of Ceramic Turbine Components
Polycrystalline silicon carbide and silicon nitride materials are currently being utilized in the development of ceramic hot flow-path components for vehicular and industrial gas turbine engines. The ultimate success of these efforts, as reflected in marketable products, is tied directly to the realization of consistent, reproducible properties in actual components. The current state-of-the-art of structural silicon base ceramics, while developing rapidly, is still judged to be in a state of infancy. At present, engineering ceramic materials, with sufficiently well-developed materials and process specifications, that meet component reliability goals are not available. Considering the susceptibility of silicon base ceramics to failure from flaws of the order of 100 microns or less in size, it is clear that new, sophisticated process control procedures, heretofore, not required in commercial applications, and new, highly sensitive, nondestructive evaluation (NDE) techniques must be developed.
KeywordsSilicon Nitride Ultrasonic Attenuation Photoacoustic Spectroscopy Photoacoustic Signal Burst Strength
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