Comparative study on oxidation behavior of selected MCrAlY coatings by elemental concentration profile analysis

D. Seo, K. Ogawa, Y. Suzuki, K. Ichimura, T. Shoji, S. Murata

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

In this work, the high temperature oxidation behavior of selected MCrAlY overlay coatings has been investigated using the elemental concentration profile analysis. Emphasis is placed upon the influence of chemical composition on the oxidation. The results show that the oxide scale formation on coatings is considerably influenced by the microstructure of coating, the chemical composition of M as well as CrAlY, and the interdiffusion from substrate. If an element exists only in the one side of the overlay coating system, the diffusion amount of that particular element becomes higher. The vacancies which formed near the substrate/coating interface after thermal exposure could be generated by the diffusion of Ni and Al. A seriously diffusion-affected zone between substrate and coating are observed within 80 μm from the substrate/coating interface toward the coating surface. The cobalt-including CoCrAlYs and CoNiCrAlYs outperform the nickel-based system under the high temperature oxidizing condition.

Original languageEnglish
Pages (from-to)2581-2590
Number of pages10
JournalApplied Surface Science
Volume255
Issue number5 PART 2
DOIs
Publication statusPublished - 2008 Dec 30

Keywords

  • Elemental concentration profile analysis
  • MCrAlY
  • Oxidation
  • Plasma spraying

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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