The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 17, 1991
Filed:
Feb. 19, 1991
Albert G Tobin, Smithtown, NY (US);
Grumman Aerospace Corporation, Bethpage, NY (US);
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.