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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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References

Mevrel,  R., 1989, “State of the Art on High-Temperature Corrosion-Resistant Coatings,” Mater. Sci. Eng., A120, pp. 13–24.
Parker,  D. W., and Kunter,  G. L., 1994, “HVOF Moves Into the Industrial Mainstream,” Adv. Mat. Proc. 146, No. 1, pp. 31–35.
Irons, G., and Zanchuk, V., 1993, “Comparison of MCrAlY Coatings Sprayed by HVOF and Low Pressure Processes,” Proceedings, 1993 National Thermal Spray Conferences, CA, pp. 191–196.
Irons, G., 1992, “Higher Velocity Thermal Spray Processes Produce Better Aircraft Engine Coatings,” paper presented at 28th Annual Aerospace/Airline Plating & Metal Finishing Forum & Exposition, CA, SAE Paper 920947.
Russo, L., and Dorfman, M., 1995, “High Temperature Oxidation of MCrAlY Coatings Produced by HVOF,” Proceedings, 14th International Thermal Spray Conference, JPN, pp. 1179–1184.
Nestler, M. C., Hohle, R. M., Balbach, W. M., and Koromzay, T., 1995, “Economical Advantages of HVOF-Sprayed Coatings for the Land Based Gas Turbine Industry,” Proceedings, 14th International Thermal Spray Conference, JPN, pp. 101–106.
Clark, R., Barbezat, G., Keller, S., and Nicoll, A. R., 1995, “A Review of HVOF System Process Considerations for Optimizing Coatings in Turbo-Machinery,” Proceedings, 14th Inter. Thermal Spray Conf., JPN, pp. 1173–1178.
Wood,  M. I., 1989, “Mechanical Interaction Between Coatings and Super Alloys Under Condition of Fatigue,” Surf. Coat. Technol., 39/40, pp. 29–42.
Veys,  J. M., and Mevrel,  R., 1987, “Influence of Protective Coating on the Mechanical Properties of CMSX-2 and Contac784,” Mater. Sci. Eng., 88, pp. 253–260.
Ishiwata, Y., Saitoh, M., and Itoh, Y., 1995, “Coating Design and Evaluation of High-Temperature Strength,” Proceedings, 1995 Yokohama International Gas Turbine Congress, 95-Yokohama-IGTC-71, pp. 99–106.
Grunling,  H. W., Schneider,  K., and Singheiser,  L., 1987, “Mechanical Properties of Coating Systems,” Mater. Sci. Eng., 88, pp. 177–189.
Stoney,  G. G., 1909, “The Tension of Metallic Films Deposited by Electrolysis,” Surf. Eng. 16-1, pp. 172–175.
Kuroda,  S., and Glyne,  T. W., 1991, “The Quenching Stress in Thermally Sprayed Coatings,” Thin Solid Films, 200, pp. 49–66.
Itoh,  Y., Saitoh,  M., and Miyazaki,  M., 1994, “Mechanical Properties of Low-Pressure-Plasma Sprayed MCrAlY Coatings,” J. Soc. Mater. Sci. Jpn., 43, pp. 690–695.
Gill,  S. C., and Clyne,  T. W., 1990, “Stress Distribution and Material Response in Thermal Spraying of Metallic and Ceramic Deposits,” Metall. Trans. B, 21B, pp. 377–385.

Figures

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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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