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Improvement of oxidation-resistance of NiCrAlY coatings by application of CrN or CrON interlayer

Published online by Cambridge University Press:  31 January 2011

W.Z. Li ,
Y. Yao ,
Q.M. Wang ,
Z.B. Bao ,
J. Gong ,
C. Sun  and
X. Jiang
W.Z. Li
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China; and School of Resources and Environments, Guangxi University, Nanning 530004, People’s Republic of China
Y. Yao
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
Z.B. Bao
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
X. Jiang
Affiliation:
Institute of Materials Engineering University of Siegen, Paul-Bonatz-Str. 9-11, Siegen 57076, Germany
*
a) Address all correspondence to this author. e-mail: csun@imr.ac.cn
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Abstract

NiCrAlY coatings with and without CrN or CrON interlayer as diffusion barrier were deposited on superalloy DSM11 by arc ion plating (AIP). The oxidation performance of the coating systems was evaluated by isothermal oxidation tests at 1100 °C for 100 h. The element interdiffusion and oxidation behavior of the coating systems were described. It was found that the NiCrAlY coatings provided protective effect for the DSM11 substrate. However, serious interdiffusion between the coatings and substrate resulted in rapid degradation of the coatings. The addition of CrN or CrON interlayer between the coatings and substrate markedly decreased the interdiffusion. CrON interlayer performed better than CrN interlayer, which was attributed to the excellent diffusion barrier ability of Al2O3 layer formed in the interlayer at high temperature. Also, the NiCrAlY/CrON coating system exhibited more effective protection for DSM11 than the NiCrAlY/CrN coating system.

Keywords

OxidationBarrier layerDiffusion
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 2 , February 2008 , pp. 341 - 352
Copyright
Copyright © Materials Research Society 2007

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References

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