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:
Mar. 19, 1996
Filed:
May. 10, 1995
Mehar C Meelu, Birmingham, GB;
Rolls-Royce plc, London, GB;
Abstract
A multiplex protective MCrAlY-based coating system for an M-based superalloy base material, where M is at least one of iron, cobalt and nickel, has a surface layer containing aluminides of platinum and the M constituent of the coating. There may be a single surface layer (FIG. 2) containing platinum modified aluminide, or alternatively a double surface layer (FIG. 3) in the form of a top layer containing platinum modified aluminide and a sub-surface layer containing aluminides substantially without platinum modification. The surface layer may also have extra chromium in solid solution in the M constituent of the coating, the chromium content in the surface layer of the coating being not more than about 40 wt. %, preferably 35 to 40 wt. %. The process for production of such a system involves deposition of an MCrAlY coating, optionally chrimizing it, and then aluminising and platinising it using appropriate amounts of platinum and appropriate heat treatments to obtain the desired variant of the coating system. Alternatively, to boost aluminium levels near the surface, the coating can be platinised immediately before it is aluminised.