Oxidation resistant superalloy castings
AssigneesHowmet Corporation, United Technologies Corporation
InventorsStephen Chin, Donald R. Parille, Paul R. Aimone, Robert L. McCormick, Paul R. Johnson, Bart M. Kilinski
Life of this patent
Estimating the term…
Abstract
The oxidation resistance of a superalloy casting such as an equiaxed, directionally solidified, or single crystal casting, is improved by melting, pouring, or casting the alloy so as to react with a magnesium or calcium-bearing ceramic material. Magnesium or calcium is introduced into the alloy through a controlled reaction between the alloy and the magnesium or calcium-bearing ceramic material.
Claims22
A method of improving the oxidation resistance of a superalloy, comprising reacting the superalloy in the molten state with a magnesium or calcium-bearing ceramic material to introduce magnesium or calcium into the superalloy in an amount effective to increase its oxidation resistance.
A method of improving the oxidation resistance of a superalloy component cast from a superalloy melt, comprising reacting the superalloy melt with a magnesium or calcium-bearing ceramic material during the casting process to introduce magnesium or calcium into the superalloy in an amount effective to increase the oxidation resistance of the cast superalloy component.
A method for making an oxidation resistant nickel base superalloy having a single crystal microstructure, comprising the steps of preparing a casting mold which comprises a plurality of slurry layers and stucco layers, wherein at least one of said layers includes magnesia;
- melting the superalloy;
- pouring the melted superalloy into the mold, wherein the melted superalloy reacts with the magnesia layer such that the superalloy becomes enriched with magnesium in an amount effective to increase its oxidation resistance;
- and solidifying the magnesium enriched superalloy in the mold at a rate sufficient to produce a single crystal superalloy.
A method of making a hollow oxidation resistant nickel base superalloy having a single crystal microstructure, comprising the step of solidifying the superalloy in a mold having a magnesia-bearing core disposed therein to introduce magnesium into the superalloy in an amount effective to increase its oxidation resistance when solidified.
Dependencies are inferred from the claim text.