Paper Title:
High Temperature Oxidation Resistance of Two Ni(Co)CrAlYSi(Hf) Overlay Coatings
  Abstract

Two MCrAlY overlay coatings (NiCrAlYSi and NiCoCrAlYHf) were deposited on a DS superalloy of Ni-Al-Cr-Co-W-Mo-Ta-Hf system by vacuum arc deposition method. The two coatings show a good protection for the DS superalloy during the isothermal oxidation test at 1150 for 100 h. A continuous alumina-based scale was formed at the surfaces of the coated specimens after oxidation. Y2O3, NiO and SiO2 are also detectable in the oxide scale. For the Hf-bearing coating, some HfO2 particles exist at the interface between the coating and the substrate. But after the cyclic thermal oxidation at 1100°C, the Hf-free coating exhibited better oxidation resisitance than the Hf-bearing coating. The HfO2 blocks between the coat and the substrate may be the crack initiation which leads to the failure of the coating.

  Info
Periodical
Materials Science Forum (Volumes 539-543)
Main Theme
Edited by
T. Chandra, K. Tsuzaki, M. Militzer , C. Ravindran
Pages
1146-1152
DOI
10.4028/www.scientific.net/MSF.539-543.1146
Citation
Z. H. Huang, Y. N. Tan, X. H. Zhao, J. P. Li, Q. Zhang, "High Temperature Oxidation Resistance of Two Ni(Co)CrAlYSi(Hf) Overlay Coatings", Materials Science Forum, Vols. 539-543, pp. 1146-1152, 2007
Online since
March 2007
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$35.00
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