Study on Microstructure and Oxidation-Resistance of Superalloy Coating with Ni-Base Substituting for Co-Base

Abstract:

Microstructures, morphologies and energy spectrums of oxidized films and their cross sections of plasma sprayed alloy coating Co-02 with Co-base, Co-04 whose matrix is nickel partially instead of cobalt and NDCo-02 with Ni-base substituting for Co-base were investigated. The result indicates that the coatings of these three kinds of alloys are white austenite base and Cr₇C₃ and Cr₇(C, B)₃ eutectic; Co-02 produces Cr2O3 oxidation protection film, and there were distinct areas with shortage of chromium in Co-04 and NDCo-02 coatings where CoCr₂O₄ and NiCr₂O₄ oxidation protection films were produced with spinel structure, these efficiently improved oxidation resistance; these three kinds of alloys have super oxidation resistance which increases according to NDCo-02,Co-04 and Co-02 orderly. The level of oxidation resistance was assessed.

• Periodical: Advanced Materials Research (Volumes 581-582)
• Pages: 586-589
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.581-582.586
• Online since: October 2012
• Authors: Chun Lian Hu, Shang Lin Hou
• Keywords: Oxidation Resistance, Sprayed Coating, Superalloy Powder

References

[1] W.Z. Luo, Transactions of the China Welding Institution. 18(2) (1997) 42-45.

[2] Q.R. Huang. Superalloy. Metallurgical industry press. Beijing, 2000, 9-13.

[3] G.X. Tang, Z.X. Zhu, Y.Q. Cheng and at el, J Tsinghua Univ (sci & tech). 41(11) (2001) 42-44.

[4] Q.Y. Hou, J.S. Gao, Welding technology. 32(5) (2003) 9-11.

[5] Q.B. Gao. Spraying technology for valve. Mechanical industry press, Beijing, 1994, 494-500.

[6] H.C. Lin, R.G. Ding, Y.G. Zhao, Hot Working Technology, 4(1997) 10-12.

[7] X.F. Li, Chinese Journal of Rare Metals. 26( 2) (2002) 108-112.

[8] J.K. Zhai, Metal Corrosions at Hi-temperature. Beihang university press, Beijing, 1994, 105-107.