Hot corrosion resistant coatings

Details Hot corrosion resistant coatings Hot corrosion resistant coatings

1982-02-01

1983-02-01

Silverberg, Sam

Coating processes

Coating by vapor, gas, or smoke

427252, 4272552, 427 1, 427253, 4273839, 148 63, 148 6, C23C 1100

Patent

active

043715702

ABSTRACT:
A coated article and method for producing the coated article are described. The article is provided with a coating system which provides protection against hot corrosion at moderate temperatures (1200-1700.degree. F.). An overlay coating based on a metal selected from the group consisting of iron, nickel or cobalt or mixtures thereof and containing chromium and optionally aluminum, yttrium and/or hafnium is applied to the article to be protected. A silicon rich surface zone is produced at the surface of the overlay coating. Methods including pack cementation and physical vapor deposition are described for producing the coating.

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