Articles
  • Enhancement in the thermal oxidation resistance of a Ni-Cr-base superalloy using ceramic coatings 
  • H. Choa, D.M. Leea, J.H. Leea, H.S. Leeb, K.H. Bangc and B.W. Leed,*
  • a Department of Nanosystem and Nanoprocess Engineering, Pusan National University, Gyeongnam 627-706, Korea b School of Materials Science and Engineering, Pusan National University, Busan 609-735, Korea c Division of Mechanical and Information Engineering, Korea Maritime University, Busan 606-791, Korea d Department of Materials Engineering, Korea Maritime University, Busan 606-791, Korea
Abstract
A comparative study of the thermal oxidation behavior of a Ni-Cr-base superalloy, Inconel 617, with and without a refractory ceramic coating layer has been conducted and a significant enhancement in the thermal oxidation resistance was obtained by employing the refractory ceramic coatings. 2.5-3.0 mu m thick TiAlN- or Al2O3-coated Inconel 617 samples showed much lower mass changes than bare Inconel 617 after annealing at 1000 degrees C for up to 48 h by suppressing the inhomogeneous formation of Cr2O3 at the surface region through the reaction between oxygen and grain boundary-diffused Cr.

Keywords: thermal oxidation resistance; a Ni-Cr-base superalloy; Ceramic coating; Inconel 617; surface oxidation; Cr2O3 formation

This Article

  • 2007; 8(6): 453-457

    Published on Dec 31, 2007