Method for coating and protecting a substrate
AssigneesSermatech International, Inc., Flame Spray S.p.A.
InventorsGianPaolo Mor, Mark F. Mosser
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Abstract
A method of coating a substrate is provided. A metallic layer comprising at least about 8% nickel is deposited by thermal spraying on a substrate. The metallic layer has an average density greater than about 80%. A slurry layer comprising from about 10% to about 90% aluminum or alloy thereof is deposited on the metallic layer. Heating to a temperature in excess of 500° C. (932° F.) results in the formation of an intermetallic layer of NiAl. The resulting coating is particularly suited for protecting the surfaces of incinerators or other combustion chambers.
Claims15
A method of coating a substrate comprising the steps of:
- a. depositing onto a substrate by thermal spraying a metallic layer, said metallic layer comprising at least about 8% nickel by weight, said metallic layer having an average density greater than about 80%;
- and
- b. depositing a slurry layer onto the metallic layer, said slurry layer comprising one or more diffusable aluminum-containing metallic pigments and one or more inorganic liquid binders, said slurry layer comprising from about 10% to about 90% aluminum or alloy thereof by weight.
A method of repairing a nickel-containing metallic layer which has seen deposited by thermal spraying, said metallic layer comprising at least about 8% nickel by weight, and having an average density greater than about 80%, the method comprising:
- a. depositing a slurry layer onto the metallic layer, said slurry layer comprising one or more diffusable aluminum-containing metallic pigments and one or more inorganic liquid binders, said slurry layer comprising from about 10% to about 90% aluminum or alloy thereof by weight, and
- b. curing said slurry layer to form a coating on said nickel-containing metallic layer.
Dependencies are inferred from the claim text.