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US 5,858,558 AGranted
Nickel-base sigma-gamma in-situ intermetallic matrix composite
AssigneeGeneral Electric Company
InventorsJi-Cheng Zhao, Melvin Robert Jackson
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AssigneeGeneral Electric Company
InventorsJi-Cheng Zhao, Melvin Robert Jackson
Estimating the term…
A nickel-base gamma-sigma intermetallic matrix composite material suitable for forming gas turbine engine components and structural coatings for such components. The composite material contains, in weight percent, about 20 to 50 chromium, about 0 to 32 molybdenum, and about 0.5 to 7 silicon, with the balance being nickel and incidental impurities. In addition, the composite material may contain aluminum and titanium in amounts of up to about 7 and 3 weight percent, respectively. The resulting intermetallic matrix composite material is characterized by a sigma volume fraction of greater than 30 percent, preferably at least about 50 percent, and may have a dendritic, fibrous or lamellar microstructure. The composite material can be cast to form a component, or deposited by known techniques to form a structural coating on a component.
A nickel-base gamma-sigma intermetallic matrix composite material comprising, in weight percent, about 20 to 50 chromium, about 0 to 32 molybdenum, about 0.5 to 7 silicon, about 0 to 7 aluminum, and about 0 to 3 titanium, with the balance being nickel and incidental impurities, characterized by a sigma volume fraction of greater than 30 percent.
A process comprising the steps of:
A process for producing an intermetallic matrix composite material characterized by high-temperature oxidation resistance, comprising the step of directionally solidifying a melt of a nickel-containing alloy to form a composite material characterized by a sigma volume fraction of greater than about 30 percent, wherein the alloy comprises, in weight percent, about 20 to 50 chromium, about 0 to 32 molybdenum, about 0.5 to 7 silicon, about 0 to 7 aluminum, and about 0 to 3 titanium, with the balance being nickel and incidental impurities.
Dependencies are inferred from the claim text.