Effect of particle size distribution on isothermal oxidation characteristics of plasma sprayed CoNi- and CoCrAlY coatings

Dowon Seo, Kazuhiro Ogawa, Tetsuo Shoji, Shozo Murata

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

The effect of particle size distribution on the degradation behavior of plasma sprayed CoNi- and CoCrAlY coatings during isothermal oxidation was investigated, in terms of the oxygen content, porosity, surface roughness, and oxide scale formation. The results show that the degradation of both coatings was considerably influenced by the starting particle size distribution. It also shows that in the as-sprayed vacuum plasma spray (VPS) coatings the oxygen content on the coating surface increased significantly with decreased average particle size. But after thermal exposure, the difference of the oxygen contents between the coatings with different particle size was decreased. The powder with various particle size resulted in low porosity inside the coatings during the deposition process. The surface roughness of the coatings increased with increased particle size. The small particles produced a relatively smooth surface, and the oxide growth in the coating deposited by small particle was slower than that in the large particle coating.

Original languageEnglish
Pages (from-to)954-966
Number of pages13
JournalJournal of Thermal Spray Technology
Volume16
Issue number5-6
DOIs
Publication statusPublished - 2007 Dec 1

Keywords

  • CoNiCrAlY
  • Isothermal oxidation
  • Particle size distribution
  • Vacuum plasma spray

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Materials Chemistry

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