A CoNiCrAlY-coated blade of an in-service gas turbine is analyzed, and a diffusion layer is formed along the boundary between the coating and the substrate due to the interdiffusion in the middle and tip of the blade. Such a layer is not observed in the vicinity of the blade root because of a comparatively low temperature during the operation. Coated specimens are prepared from the portions of the blade devoid of the diffusion layers, and the specimens are exposed to a high temperature in air. On the basis of the increase in the diffusion layer thickness, an equation for estimating the temperature of the blade is derived. An analysis of another in-service blade with a thermal barrier coating is carried out. The aluminum content decreases below the bond coat surface due to Al diffusion caused by the Al-oxide formation. This results in the formation of an Al-decreased layer (ADL) along the leading and trailing edges. The ADL is not observed at the center of the blade chord. The specimens are extracted from the portions of the blade that are devoid of ADL, and they are subjected to a high temperature in air. On the basis of the increase in the ADL thickness, a temperature-estimation equation is derived.
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February 2011
Research Papers
Derivation of Temperature-Estimation Equation Based on Microstructural Changes in Coatings of In-Service Blades of Gas Turbines
Mitsutoshi Okada,
Mitsutoshi Okada
Energy Engineering Research Laboratory,
Central Research Institute of Electric Power Industry
, Yokosuka, Kanagawa-ken 240-0196, Japan
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Tohru Hisamatsu,
Tohru Hisamatsu
Energy Engineering Research Laboratory,
Central Research Institute of Electric Power Industry
, Yokosuka, Kanagawa-ken 240-0196, Japan
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Terutaka Fujioka
Terutaka Fujioka
Energy Engineering Research Laboratory,
Central Research Institute of Electric Power Industry
, Yokosuka, Kanagawa-ken 240-0196, Japan
Search for other works by this author on:
Mitsutoshi Okada
Energy Engineering Research Laboratory,
Central Research Institute of Electric Power Industry
, Yokosuka, Kanagawa-ken 240-0196, Japan
Tohru Hisamatsu
Energy Engineering Research Laboratory,
Central Research Institute of Electric Power Industry
, Yokosuka, Kanagawa-ken 240-0196, Japan
Terutaka Fujioka
Energy Engineering Research Laboratory,
Central Research Institute of Electric Power Industry
, Yokosuka, Kanagawa-ken 240-0196, JapanJ. Eng. Gas Turbines Power. Feb 2011, 133(2): 022101 (6 pages)
Published Online: October 29, 2010
Article history
Received:
April 13, 2010
Revised:
April 26, 2010
Online:
October 29, 2010
Published:
October 29, 2010
Citation
Okada, M., Hisamatsu, T., and Fujioka, T. (October 29, 2010). "Derivation of Temperature-Estimation Equation Based on Microstructural Changes in Coatings of In-Service Blades of Gas Turbines." ASME. J. Eng. Gas Turbines Power. February 2011; 133(2): 022101. https://doi.org/10.1115/1.4001998
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