High temperature oxidation behaviour of combustion flame sprayed CoNiCrAlY coatings

H. Chen, M. Fan, W. Zhu, A. D. Norton

Research output: Journal PublicationArticlepeer-review

9 Citations (Scopus)

Abstract

This paper investigates the high temperature oxidation behaviour of combustion flame sprayed CoNiCrAlY coatings. Three CoNiCrAlY coatings with different fractions of internal oxides were prepared by varying the standoff distance and the oxygen-to-acetylene ratio. The high temperature oxidation behaviour of the combustion flame sprayed CoNiCrAlY coatings were examined in air at 1100 °C. Microstructural analysis revealed that spinel oxides and alumina scale formed in the CoNiCrAlY coatings which have low content of internal oxide stringers. NiCo-oxides, which exhibit polyhedral morphology, were found in the coating with high content of internal oxide stringers. In addition, it is found that the internal oxidation initiated in the concave regions at the oxide/coating interface and internal nitridation occurred at long exposure conditions.

Original languageEnglish
Article number125431
JournalSurface and Coatings Technology
Volume385
DOIs
Publication statusPublished - 15 Mar 2020

Keywords

  • CoNiCrAlY coatings
  • Combustion flame spray
  • Internal nitridation
  • Internal oxidation
  • Oxide morphology

ASJC Scopus subject areas

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

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