TECHNICAL PAPERS: Gas Turbines: Manufacturing, Materials, and Metallurgy

Characteristics of MCrAlY Coatings Sprayed by High Velocity Oxygen-Fuel Spraying System

[+] Author and Article Information
Y. Itoh, M. Saitoh, M. Tamura

Toshiba Corporation, 2-1, Ukishima-cho, Kawasaki-ku, Kawasaki, Kanagawa, 210-0862, Japan

J. Eng. Gas Turbines Power 122(1), 43-49 (Jul 30, 1999) (7 pages) doi:10.1115/1.483173 History: Received May 01, 1997; Revised July 30, 1999
Copyright © 2000 by ASME
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EPMA analysis of NiCoCrAlY powder for thermal spraying
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Testing apparatus and configuration of test specimen
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EPMA analysis of NiCoCrAlY coating sprayed by HVOF process: (a) as-sprayed; (b) heat-treated (1393 K-2 h, 1116 K-24 h, Ar gas cooled).
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Comparison of relative density between HVOF and VPS coatings
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Variation of chemical compositions for MCrAlY coatings due to various thermal spraying processes
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Mechanical properties of MCrAlY coatings in comparison with HVOF process and VPS process: (a) CoCrAlY coatings; (b) NiCoCrAlY coatings.
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SEM observation of fracture surface for NiCoCrAlY coating sprayed by HVOF process
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Change of temperature and deflection of test specimens during thermal spraying: (a) HVOF process; (b) APS process.
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Effect of combustion gas pressure on substrate temperature and deflection of test specimens during thermal spraying: (a) effect of spraying passes on substrate temperature; (b) effect of spraying passes on substrate deflection.
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Macrostructure of HVOF coating in the case of various combustion gas pressure
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Measurement results of residual stresses at the surface of MCrAlY coatings
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Residual stress generating mechanism during thermal spraying
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Estimation of residual stress distribution by the inherent strain caused by thermal shrinkage and peening effect of coating layer



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