Method for forming alumina-yttrium composite coating layer of nickel-based superalloy

摘要

The present invention relates to a method for forming an alumina-yttrium composite coating layer of a nickel-base superalloy used for a turbine blade material of a gas turbine engine and the like. The alumina-yttrium composite coating layer is finally subjected to heat treatment after alumina-And a method for forming an alumina-yttrium composite coating layer of a nickel-base superalloy capable of remarkably improving corrosion resistance.;The present invention relates to a method for forming an aluminide-yttrium composite coating layer of a nickel-based superalloy, comprising the steps of: subjecting a nickel-base superalloy to aluminide diffusion coating using a normal packing method; Ion plating using a conventional ion plating method; And a step of heat treating the aluminide-yttrium composite coating layer formed in the step at a temperature of 1000-1300C in a non-oxidizing atmosphere for 2 hours or more. The method for forming a composite coating layer of alumina-.