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High-temperature oxidation behavior of arc ion plated NiCoCrAlYSiB coatings on cobalt-based superalloy

Published online by Cambridge University Press:  01 March 2006

Y.J. Tang ,
Q.M. Wang ,
F.H. Yuan ,
J. Gong  and
C. Sun
Y.J. Tang
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
Q.M. Wang
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
F.H. Yuan
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
J. Gong
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
C. Sun*
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

NiCoCrAlYSiB coatings were deposited on the Co-based superalloy K40 by arc ion plating (AIP). The oxidation behavior of the bare alloy and of the coated specimens was tested in static air for 200 h at 1000 °C and 100 h at 1050 °C. The results showed that the oxidation rate of the system was greatly reduced by the addition of the NiCoCrAlYSiB coatings. Thin and adherent α–Al2O3 scales that formed on the coated specimens protected the substrates from further oxidation attack while non-protective oxide scales, mainly of Cr2O3 and CoCr2O4, appeared on bare K40 alloy. Element profiles on metallographic cross sections indicated that apparent interdiffusion occurred between the coatings and the substrates. The interdiffusion behavior and the resulting microstructure were investigated. As compared to aluminide coatings, NiCoCrAlYSiB coatings have less influence on the substrate microstructure.

Keywords

AnnealingCoatingOxidation
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 3 , March 2006 , pp. 737 - 746
Copyright
Copyright © Materials Research Society 2006

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