Thermal cycle properties of plasma sprayed oxidation-resistant metallic coatings

Satoru Takahashi, Masaki Hatano, Yoshitaka Kojima, Yoshio Harada, Akira Kawasaki, Fumio Ono

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Thermal cycle resistance of Ni-20Cr, Ni-50Cr and CoNiCrAlY coatings produced by air plasma spraying was investigated according to Japanese Industrial Standard Testing method for thermal cycle resistance of oxidation resistant metallic coatings (JIS H 8452: 2008). The specimens were exposed to a cyclic heating and cooling regimen comprised of up to 100 cycles of 10 hours heating to 1000 °C or 1093 °C in air followed by cooling. The thermal cycle resistance of oxidation-resistant metallic coatings was found to depend strongly on testing temperature and on the chemical composition of the coating materials. In thermal cycle testing at 1000 °C, no remarkable failure was observed in any specimen. However, in thermal cycle testing at 1093 °C, spalling was observed over the entire surface of the Ni-20Cr coating, although the Ni-50Cr and the CoNiCrAlY coatings exhibited excellent thermal cycle resistance even upon exposure to 100 thermal cycles. The CoNiCrAlY coating showed mass gain with increasing number of thermal cycles due to preferential oxidation between thermal spray particle splats. Furthermore, the failure behavior of specimens was investigated in detail by SEM, XRD, EPMA, etc.

Original languageEnglish
Title of host publicationHigh-Temperature Oxidation and Corrosion 2010, ISHOC-10
PublisherTrans Tech Publications Ltd
Pages296-301
Number of pages6
ISBN (Print)9783037852354
DOIs
Publication statusPublished - 2011
Event3rd International Symposium on High-Temperature Oxidation and Corrosion, ISHOC-10 - Zushi, Japan
Duration: 2010 Nov 82010 Nov 11

Publication series

NameMaterials Science Forum
Volume696
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Other

Other3rd International Symposium on High-Temperature Oxidation and Corrosion, ISHOC-10
CountryJapan
CityZushi
Period10/11/810/11/11

Keywords

  • Oxidation-resistant metallic coating
  • Standard
  • Testing method
  • Thermal cycle resistance
  • Thermal spray

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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