Paper Title:
Effect of Platinum Pre-Coating on Isothermal Oxidation Behavior of MCrAlY Coating by Plasma Spray Process
  Abstract

In this work we have evaluated the effect of platinum (Pt) pre-coating on microstructure evolution of MCrAlY coating during isothermal oxidation, to improve high temperature oxidation and corrosion resistance of the nickel-based superalloy MAR M247-DS. Pt was deposited on the superalloy by electroplating before the MCrAlY coating by a vacuum plasma spray, which was compared to the superalloy without Pt pre-coating. The samples were subjected to isothermal oxidation in a box furnace at 1100°C for 25–150 hrs. The weight gain and loss caused by the oxidation of samples was recorded, and the variation of surface layer and interface morphology were observed before and after the oxidation tests. The length decrement of cross section is remarkably low on according to the precipitation of (Ni,Pt)Al phase by Pt pre-coating. Also, the amount of voids at interface between the coating and the superalloy, which would be introduced as a processing defect, is reduced by Pt pre-coating.

  Info
Periodical
Materials Science Forum (Volumes 544-545)
Edited by
Hyungsun Kim, Junichi Hojo and Soo Wohn Lee
Pages
721-724
DOI
10.4028/www.scientific.net/MSF.544-545.721
Citation
D. W. Joo, S. H. Park, Y. G. Jung, J. H. Lee, C. H. Ye, K. H. Lee, "Effect of Platinum Pre-Coating on Isothermal Oxidation Behavior of MCrAlY Coating by Plasma Spray Process", Materials Science Forum, Vols. 544-545, pp. 721-724, 2007
Online since
May 2007
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$32.00
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