High temperature corrosion resistant composite coatings

Details High temperature corrosion resistant composite coatings High temperature corrosion resistant composite coatings

1995-05-10

1996-03-19

Utech, Benjamin

Coating processes

With post-treatment of coating or coating material

Heating or drying

4273764, 4273766, 4273767, 4273768, 427404, 427405, B05D 302

Patent

active

055002528

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.

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