METHODS FOR MAKING HIGH-TEMPERATURE COATINGS HAVING PT METAL MODIFIED .GAMMA.NI+.GAMMA.'-NI3A1 ALLOY COMPOSITIONS AND A REACTIVE ELEMENT

摘要

A method for making an oxidation resistant article, including (a) depositing alayer of a Pt group metal on a substrate to form a platinized substrate; and(b) depositing on the platinized substrate layer of Pt group metal a layer ofa reactive element selected from the group consisting of Hf, Y, La, Ce and Zrand combinations thereof to form a surface modified region thereon, whereinthe surface modified region includes the Pt-group metal, Ni, Al and thereactive element in relative concentration to provide a .gamma.-Ni + .gamma.~-Ni3Al phase constitution.