Influence of heat exposure time on isothermal degradation of plasma sprayed CoNiCrAlY coatings

D. Seo, K. Ogawa, M. Tanno, T. Shoji, S. Murata

研究成果: Article査読

21 被引用数 (Scopus)

抄録

In this work, the thermal degradation behavior of selected CoNiCrAlY coatings has been studied. Emphasis was placed upon the change of oxygen content, porosity, surface roughness, and oxidation behavior. The results show that the isothermal degradation of coatings was considerably influenced by the heat exposure time and powder particle distribution. The values of oxygen content, surface roughness, and TGO scales converge sharply into the stable extremes at the initial stage of heat exposure. The particle size has an effect on the oxygen content in as-sprayed coatings. After heat exposure, the difference of the oxygen content on coating deposited using between the smaller and larger particle was decreased. The cross-sectional porosity decreased at Stage IP, increased at Stage IIP, and then decreased again. These could be due to the sintering effect at Stage IP. The surface roughness decreased up to Stage IR, but over Stage IR, surface roughness was kept in relatively fixed value or increased slightly. The TGO thickness growth rate and parabolic oxidation rate constant are influenced by the surface roughness of coatings.

本文言語English
ページ(範囲)7952-7960
ページ数9
ジャーナルSurface and Coatings Technology
201
18
DOI
出版ステータスPublished - 2007 6 25

ASJC Scopus subject areas

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

フィンガープリント 「Influence of heat exposure time on isothermal degradation of plasma sprayed CoNiCrAlY coatings」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル