Evaluation of the critical oxide thickness to initiate spallation from a LPPS CoNiCrAlY coating

S. Gray*, M. P. Taylor, E. Chau, H. E. Evans

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The critical oxide thickness required to initiate spallation from an LPPS CoNiCrAlY overlay coating during cooling from 1100°C to room temperature has been determined metallographically and has been found to lie within the range 2.5 to 3.2 μm. This finding compares favourably with a finite element model developed for a compatible alloy system in which delamination and spallation are assumed to be due to the mechanism of wedge cracking at the TGO coating interface.

Original languageEnglish
JournalJournal of Corrosion Science and Engineering
Volume6
Publication statusPublished - 2003

Keywords

  • Critical oxide thickness
  • LPPS
  • MCrAlY
  • Overlay coatings
  • Spallation
  • TGO

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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