Alumina seal coating with interlayer
AssigneeRaytheon Technologies Corporation
InventorChristopher W. Strock
Life of this patent
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Abstract
An abrasive coating for a substrate including a metallic based bond coat layer; a top layer; and an intermediate layer between the metallic based bond coat layer and the top layer. A method of applying an abrasive coating including applying a metallic based bond coat layer onto a substrate; grading an intermediate layer into the metallic based bond coat layer to form a graded transition between the metallic based bond coat layer and the intermediate layer; and grading a top layer into the intermediate layer to form a graded transition between the intermediate layer and the top layer.
Claims20
An abrasive coating for a nickel based alloy rotor disk for a gas turbine engine comprising:
- a metallic based bond coat layer that is 3-12 mils thick, and forms a 0.1-0.5 fraction of the total thickness of the abrasive coating;
- a top layer that is 5.5-22 mils thick and has a porosity of between 1-20 volume percent, the top layer forms a 0.2-0.6 fraction of the total thickness of the abrasive coating;
- and
- a zirconia based intermediate layer between the metallic based bond coat layer and the top layer, the zirconia based intermediate layer is 1.5-6 mils thick and forms a 0.05-0.3 fraction of the total thickness of the abrasive coating.
An abrasive coating for application to a nickel based alloy rotor disk for a gas turbine engine comprising:
- a metallic based bond coat layer that forms a 0.1-0.5 fraction of the total thickness of the abrasive coating;
- a zirconia based intermediate layer graded into the metallic based bond coat layer to form a graded transition between the metallic based bond coat layer and the intermediate layer, the zirconia based intermediate layer forms a 0.05-0.3 fraction of the total thickness of the abrasive coating, the graded transition between the metallic based bond coat layer and the intermediate layer forms a 0.1-0.3 fraction of the total thickness of the abrasive coating;
- and
- a top layer graded into the intermediate layer to form a graded transition between the intermediate layer and the top layer, the top layer forms a 0.2-0.6 fraction of the total thickness of the abrasive coating, the graded transition between the intermediate layer and the top layer forms a 0.1-0.3 fraction of the total thickness of the abrasive coating, and wherein the top layer has a porosity of between 1-20 volume percent.
A rotor disk for a gas turbine engine, comprising:
- a nickel based alloy hub surface adjacent a multiple of rotor blades, the hub surface having an abrasive section comprising an abrasive coating, the abrasive coating comprising:
- a metallic based bond coat layer that is 2.5-10 mils thick, has a porosity of 5 volume percent and forms a 0.1-0.5 fraction of the total thickness of the abrasive coating;
- a zirconia based intermediate layer graded into the metallic based bond coat layer to form a graded transition between the metallic based bond coat layer and the intermediate layer, wherein the intermediate layer is 1-4 mils thick, has a porosity of 4 volume percent, and forms a 0.05-0.3 fraction of the total thickness of the abrasive coating;
- and
- a top layer graded into the intermediate layer to form a graded transition between the intermediate layer and the top layer, the top layer is 4.5-18 mils thick and has a porosity less than 20 volume percent, the top layer forms a 0.2-0.6 fraction of the total thickness of the abrasive coating.
Dependencies are inferred from the claim text.