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Proceedings Paper

A study on coating class damage degree by using cycle of gas turbine blade coating
Author(s): Choul Jun Choi; Jae Yeol Kim
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Paper Abstract

The component of the hot gas path in gas turbines can survive to very high temperatures because they are protected by ceramic Thermal Barrier Coating(TBC); the failure of such coating can dramatically reduce the component life. A reliable assessment of the Coating integrity and/or an Incipient TBC Damage Detection can help both in optimizing the inspection intervals and in finding the appropriate remedial actions. In this paper the potential of NDT techniques applicable to the metallo/ceramic coating hot parts are discussed in the light of both results obtained on laboratory aged specimens and in field measurements on operated components. An investigation of the NDTs capability to detect damage evolution was performed on thermal-cycled specimens coated with TBC by pulsed thermography. The observation of metallogaphy sections of the thermal cycled specimens allowed to give the right the interpretation to the results of NDT methodology and enlightened its specific characteristics and potentiality. Moreover in field applicability is discussed for each technique. Finally it is shown how an integrated approach of suitable coating evolution models and complimentary NDT techniques can provide an interesting assessment of the damage level of the metallo/ceramic coating of operated rotating blade

Paper Details

Date Published: 1 November 2007
PDF: 6 pages
Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 64232U (1 November 2007); doi: 10.1117/12.779892
Show Author Affiliations
Choul Jun Choi, Chosun Univ. (South Korea)
Jae Yeol Kim, Chosun Univ. (South Korea)

Published in SPIE Proceedings Vol. 6423:
International Conference on Smart Materials and Nanotechnology in Engineering
Shanyi Du; Jinsong Leng; Anand K. Asundi, Editor(s)

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