Barrier coatings for oxidation protection incorporating compatib

Coating processes – Coating by vapor – gas – or smoke – Metal coating

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4272557, 427405, 4274191, C23C 1600

Patent

active

050494180

ABSTRACT:
The present method produces a ductile oxidation-resistant surface for titanium aluminides and alloys that involves the introduction of a refractory metal diffusion barrier that is metallurgically compatible with the alloy substrate. The diffusion barrier is then coated with an intermediate copper bonding layer. The copper layer is subsequently coated with either a nickel or a nickel-based superalloy layer. If necessary, a fourth protective layer of iron-based superalloy can be used to form a protective oxide scale on exposure to a high temperature oxidizing medium. Or, the fourth layer may be nickel aluminide which forms an oxidation-resistant external layer. The advantage of this approach is that it creates oxidation-resistant surface and prevents embrittlement of the alloy substrate during high temperature oxidation exposure due to degrading coating-substrate interactions.

REFERENCES:
patent: 4142023 (1979-02-01), Bernstein et al.
patent: 4555275 (1985-11-01), Torin
patent: 4933239 (1990-06-01), Olson et al.

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