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Oxidation of Metals

, Volume 90, Issue 1–2, pp 153–167 | Cite as

High-Temperature Oxidation Behavior of Nano-structured CoNiCrAlY–YSZ Coatings Produced by HVOF Thermal Spray Technique

  • M. Hatami
  • F. Naeimi
  • M. Shamanian
  • M. Tahari
Original Paper
  • 93 Downloads

Abstract

In this study the effects of adding yttria-stabilized zirconia (YSZ) reinforcement by mechanical milling method on the oxidation resistance of CoNiCrAlY coatings were investigated. For this purpose 0, 5, 10 and 15% YSZ were mixed with the commercial CoNiCrAlY powder and mechanically milled for 24 h in argon atmosphere. The high-velocity oxygen-fuel method was used for deposition of composite and commercial powders on Inconel 617 substrate. Both commercial and nano-structured coatings were oxidized at 1000 °C for 100 h. Scanning electron microscopy together with energy-dispersive spectroscopy and X-ray diffraction analysis were used for analyzing the oxide scales formed on the coatings surface after oxidation process. The results showed that the porosity of nano-structured coatings was higher than that of the commercial coating, which was related to an undesirable morphology of the feedstock powders. The relatively high porosity of the nano-structured coatings caused the diffusion rate of oxygen into the coatings to be accelerated. On the other hand, a high Al supply due to a large amount of grain boundaries in nano-structured coatings facilitated the formation of an Al2O3 layer on coating’s surface. The undesirable oxidation of splats in nano-structured coatings during spraying resulted in an increased oxidation rate of the coatings.

Keywords

CoNiCrAlY Oxidation behavior YSZ High-velocity oxy-fuel 

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of EngineeringEsfarayen University of TechnologyEsfarayenIran
  2. 2.Advanced Materials Research Center, Materials Engineering Department, Najafabad BranchIslamic Azad UniversityNajafabadIran
  3. 3.Department of Materials EngineeringIsfahan University of TechnologyIsfahanIran

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