• Hot corrosion performance of LVOF sprayed Al2O3–40% TiO2 coating on Superni 601 and Superco 605 superalloys at 800 and 900°C

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      https://www.ias.ac.in/article/fulltext/boms/038/07/1679-1685

    • Keywords

       

      Superalloy; Al2O3–40% TiO2 coating; LVOF; microhardness; hot corrosion.

    • Abstract

       

      Al2O3–40% TiO2 coating is deposited on Superni 601 and Superco 605 superalloys by low-velocity oxy-fuel (LVOF) process. LVOF sprayed coating is characterized for surface roughness, microhardness, scanning electron microscopy and X-ray diffraction analysis. Hot corrosion of the coated and uncoated superalloys have been evaluated in an aggressive environment of Na2SO4–82% Fe2(SO4)3 under cyclic conditions at temperatures of 800 and 900°C. The microhardness and surface roughness values of the as-sprayed coatings are found to be in the range of 742–946 Hv and 14.40–14.80 𝜇m, respectively. Al2O3–40% TiO2 coating on both the superalloys has indicated protective behaviour during hot corrosion studies.

    • Author Affiliations

       

      N K Mishra1 S B Mishra1

      1. Mechanical Engineering Department, Motilal Nehru National Institute of Technology Allahabad, Allahabad 211004, India
    • Dates

       
  • Bulletin of Materials Science | News

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