Abstract: A slurry prepared with Cr2O3 powder, glass material, and clay as materials was coated on the surface of nickel-based superalloy GH44 and then melted at 1 050 °C for 10 min, forming a high temperature-resistant ceramic coating through thermochemical reaction. The surface and section morphologies and phase composition of the ceramic coating were studied by scanning electron microscopy and X-ray diffraction analysis. The thermal shock resistance,anti-oxidation performance and thermal fatigue property of the nickel-based superalloy coated with ceramic coating were tested. The results indicated that the ceramic coating has compact structure, strong adhesion to substrate, and good thermal shock resistance. The nickel-based superalloy with ceramic coating has improved high-temperature oxidation resistance (more than six times that of the substrate) and thermal fatigue property.
Keywords: nickel-based superalloy; ceramic coating; thermal shock resistance; anti-oxidation; high temperature fatigue
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