Superalloy coating composition with high temperature oxidation resistance
AssigneeHowmet Turbine Components Corporation
InventorsLouis E. Dardi, Srinivasan Shankar
Life of this patent
Estimating the term…
Abstract
Coatings for iron-, nickel- and cobalt-base superalloys and the resulting coated components having good high temperature oxidation resistance. The coatings consist essentially of, by weight, 5% to 50% chromium, 3% to 30% aluminum, 0.01% to 15% tantalum, up to 10% manganese, up to 5% tungsten, up to 12% silicon, up to 10% hafnium, up to 5% reactive metal from the group consisting of lanthanum, yttrium, and other rare earth elements, up to 5% of rare earth and/or refractory metal oxide particles, and the balance selected from the group consisting of nickel, cobalt and iron, and combinations thereof. Additions of titanium up to 5% and noble metals up to 15% are also contemplated.
Claims37
In a nickel, cobalt, or iron base superalloy component, the improvement comprising a coating composition on said component consisting essentially by weight of from 6 to 30% aluminum, 0.01 to 15% tantalum, 5 to 50% chromium, 0.1 to 10% manganese, up to 5% tungsten, up to 12% silicon, up to 10% hafnium, and the balance selected from the group consisting of nickel, cobalt, and iron and combinations thereof.
In a nickel, cobalt, or iron base superalloy component, the improvement comprising a coating composition on said component consisting essentially by weight of from 5 to 35% cobalt, 6 to 25% aluminum, 0.01 to 15% tantalum, 5 to 35% chromium, 0.1 to 10% manganese, up to 5% tungsten, up to 12% silicon, up to 10% hafnium and the balance nickel.
In a nickel, cobalt, or iron base superalloy component, the improvement comprising a coating composition on said component consisting essentially by weight of from 3 to 25% aluminum, 0.01 to 12% tantalum, 5 to 40% chromium, up to 10% manganese, up to 5% tungsten, up to 12% silicon, up to 10% hafnium, and the balance cobalt.
In a nickel, cobalt, or iron base superalloy component, the improvement comprising a coating composition on said component consisting essentially by weight of from 10 to 50% chromium, 6 to 15% aluminum, 1 to 15% of a metal mixture, and the balance selected from the group consisting of nickel, cobalt, and iron, and combinations thereof, said metal mixture consisting essentially of at least 20% by weight tantalum and the balance tungsten and manganese, said coating containing at least about 0.5% by weight tantalum and at least about 0.5% manganese.
In a nickel, cobalt, or iron base superalloy component, the improvement comprising a coating composition on said component consisting essentially by weight of from 10 to 50% chromium, 6 to 15% aluminum, 0.01 to 8% tantalum, 0.1 to 10% manganese, up to 5% tungsten, up to 12% silicon, up to 10% hafnium, and the balance selected from the group consisting of nickel, cobalt, and iron, and combinations thereof.
In a nickel, cobalt, or iron base superalloy component, the improvement comprising a coating composition on said component consisting essentially by weight of from 5 to 35% cobalt, 10 to 35% chromium, 5 to 15% aluminum, 0.01 to 8% tantalum, 0.1 to 10% manganese, up to 5% tungsten, up to 12% silicon, up to 10% hafnium, and the balance nickel.
A component according to claim 28, 31, or 34 wherein said coating is deposited by plasma spraying.
In a nickel, cobalt, or iron base superalloy component, the improvement comprising a coating composition on said component consisting essentially by weight of from 6 to 30% aluminum, 0.01 to 15% tantalum, 5 to 50% chromium, 16 to 35% cobalt, up to 10% manganese, up to 5% tungsten, up to 12% silicon, up to 10% hafnium, and the balance nickel.
In a nickel, cobalt, or iron base superalloy component, the improvement comprising a coating composition on said component consisting essentially by weight of from 6 to 30% aluminum, 0.01 to 15% tantalum, 15% chromium, up to 10% manganese, up to 5% tungsten, up to 12% silicon, up to 10% hafnium, and the balance selected from the group consisting of nickel, cobalt, and iron and combinations thereof.
Dependencies are inferred from the claim text.