Method for forming in situ diffusion barrier while diffusing alu

Details Method for forming in situ diffusion barrier while diffusing alu Method for forming in situ diffusion barrier while diffusing alu

1995-04-24

1997-08-26

Utech, Benjamin

Coating processes

With post-treatment of coating or coating material

Heating or drying

4273767, 4273768, 427405, 4274197, B05D 302

Patent

active

056608861

ABSTRACT:
An improved protective coating system for metal substrates is described. Nickel-aluminide duplex coatings are improved by adding an effective amount of boron in the nickel coating step and by retaining the boron during the aluminization step. An unexpected result of the retained boron is its non-deleterious effect on oxidation protection. During aluminization, the boron surprisingly migrates to the coating/substrate interface, forming a diffusion barrier in situ. The barrier inhibits both inward diffusion of the nickel-aluminide coating and outward diffusion of substrate impurities. The process enables thinner, less expensive coatings.

REFERENCES:
patent: 4055706 (1977-10-01), Galmiche et al.
patent: 4933239 (1990-06-01), Olson et al.
patent: 5049418 (1991-09-01), Tobin
patent: 5116670 (1992-05-01), Brindley et al.
patent: 5126213 (1992-06-01), Restall

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