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

Aluminizing Behaviors of Vacuum Plasma Sprayed MCrAlY Coatings

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

Metal and Ceramics Technology R&D Department, Toshiba Corporation, 2-4 Suehiro-cho, Tsurumi-ku, Yokohama 230-0045, Japan

J. Eng. Gas Turbines Power 124(2), 270-275 (Mar 26, 2002) (6 pages) doi:10.1115/1.1423914 History: Received December 01, 2000; Revised February 01, 2001; Online March 26, 2002
Copyright © 2002 by ASME
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SEM observation of vacuum-plasma sprayed MCrAlY coatings before aluminizing; (a) CoCrAlY coating, (b) NiCoCrAlY coating
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SEM observation and EPMA analysis of aluminide coatings at 1223 K for 10 h; (a) aluminized layer of IN738LC, (b) over-aluminized layer of as-sprayed CoCrAlY coating, (c) over-aluminized layer of heat-treated CoCrAlY coating
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Aluminizing behavior for IN738LC
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Over-aluminizing behaviors for various kinds of vacuum-plasma sprayed MCrAlY coatings; (a) as-sprayed MCrAlY coatings (b) heat-treated MCrAlY coatings
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Temperature dependency of diffusion rate constant on a parabolic time law; (a) as-sprayed MCrAlY coatings (b) heat-treated MCrAlY coatings
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Effect of nickel content in as-sprayed MCrAlY coating on aluminizing behaviors in comparison with heat-treated MCrAlY coatings; (a) material constant, k0 (mm/s1/2), (b) material constant, c (/K)
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Relative density of MCrAlY coatings measured by Archimedes method




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