METHODS OF FORMING NICKEL ALUMINIDE COATINGS

摘要

A nickel aluminide based coating system for a metallic substrate comprises a coating precursor (22), including at least one layer (24a) of nickel and at least one alloy element overlying the metallic substrate (20) obtained from a first source and at least one aluminum layer (26) overlying the metallic substrate (20) obtained from a second source and, optionally, a ceramic thermal barrier coating overlying a coating formed after suitable processing of the coating precursor. A method for forming a nickel aluminide based coating includes providing a source for providing a significant portion of the aluminum content for a coating precursor and a separate nickel alloy source for providing substantially all the nickel and additional alloying elements for the coating precursor. Cathodic arc (ion plasma) deposition techniques may be utilized. The coating precursor may be provided in discrete layers, or from a co-deposition process.