Rehealing Ability of Oxide Scales Formed on Microcrystalline K38G Coatings

摘要

The rehealing ability of the protective oxide scales formed on a microcrystalline coating of the Ni-base superalloy K38G has been studied. The results indicated that the oxide scales on the coating may be rehealed when the original scales are destroyed, and the coating still has excellent resistance against high-temperature oxidation. When the original Al_2O_3 oxide scales spall, mixed-oxide scales of both (Al, Cr)_2O_3 and TiO_2 can form on the surface. The mixed scales are very protective and adherent.