MCrAlX-alloy, protective coating made thereof and method for its production

摘要

MCrAlX alloys containing halogen in an amount of up to 5000 ppm are new, where M stands for iron, nickel and/or cobalt and X stands for yttrium, silicon, hafnium and/or rare earth metal. Independent claims are also included for: (1) protective coating comprising a MCrAlX alloy as above; (2) producing a protective coating as above by applying a layer of MCrAlX alloy by a dipping process in conjunction with a halogen salt solution or a halogen-containing organic liquid, followed by heat treatment to diffuse halogen into the layer; (3) producing a protective coating as above by applying a halogen salt to a layer of MCrAlX alloy followed by heat treatment to diffuse halogen into the layer; (4) producing a protective coating as above by heating a layer of MCrAlX alloy in a halogen-containing gas atmosphere or cooling a hot layer of MCrAlX alloy in a halogen-containing gas atmosphere; (5) producing a protective coating as above by incorporating halogen ions into a layer of MCrAlX alloy bt ion implantation.