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Journal of Materials Engineering and Performance

, Volume 15, Issue 6, pp 729–741 | Cite as

Cyclic oxidation behavior of some plasma-sprayed coatings in Na2SO4-60%V2O5 environment

  • Harpreet Singh
  • Satya Prakash
  • Devendra Puri
  • D. M. Phase
Article

Abstract

Cyclic oxidation behavior of plasma-sprayed NiCrAlY, Ni-20Cr, Ni3Al, and Stellite-6 coatings was investigated in an aggressive environment of Na2SO4-60%V2O5 by thermogravimetric techniques for 50 cycles. These coatings were deposited on a Ni-base superalloy, namely Superni 600; 10Fe-15.5Cr-0.5Mn-0.2C-Bal Ni (wt.%). X-ray diffraction, scanning electron microscopy/energy dispersive x-ray (SEM/EDX), and electron probe microanalyzer (EPMA) techniques were used to analyze the oxidation products. The uncoated superalloy suffered accelerated oxidation in the form of intense spallation of its oxide scale. After deposition of the NiCrAlY coating, the superalloy showed a minimum mass gain, whereas after application of the Stellite-6 coating, a maximum mass gain was observed among the coatings studied. All of the coatings were found to be useful in reducing the spallation of the substrate superalloy. Moreover, the coatings were successful in maintaining continuous surface contact with the base superalloy during the cyclic oxidation. The phases revealed for the oxidized coatings were mainly the oxides of chromium and/or aluminum and the spinels containing nickel-chromium/cobalt-chromium/nickel-aluminum mixed oxides, which are reported to be protective against high-temperature oxidation/hot corrosion.

Keywords

hot corrosion NiCrAlY plasma spray coatings protective coatings Stellite-6 

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Copyright information

© ASM International 2006

Authors and Affiliations

  • Harpreet Singh
    • 1
  • Satya Prakash
    • 2
  • Devendra Puri
    • 2
  • D. M. Phase
    • 3
  1. 1.Mechanical Engineering DepartmentBBSB Engineering CollegeFatehgarh SahibIndia
  2. 2.Metallurgical and Materials Engineering DepartmentIndian Institute of Technology RoorkeeRoorkeeIndia
  3. 3.Inter-University Consortium for DAE Facilities IndoreIndia

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