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US 4,731,221 AGranted
Nickel aluminides and nickel-iron aluminides for use in oxidizing environments
AssigneeThe United States of America as represented by the United States Department of Energy
InventorChain T. Liu
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Abstract
Nickel aluminides and nickel-iron aluminides treated with hafnium or zirconium, boron and cerium to which have been added chromium to significantly improve high temperature ductility, creep resistance and oxidation properties in oxidizing environments.
Claims4
A nickel aluminide consisting essentially of:
- a Ni.sub.3 Al base;
- a sufficient concentration of a Group IVB element or mixtures thereof to increase high temperature strength;
- a sufficient concentration of boron to increase ductility;
- and
- a sufficient concentration of chromium to increase ductility at elevated temperatures in oxidizing environments.
2 more elements
A nickel-iron aluminide consisting essentially of:
- a Ni.sub.3 Al base;
- a sufficient concentration of a Group IVB element or mixtures thereof to increase high temperature strength;
- a sufficient concentration of material selected from the group consisting of iron and a rare earth element or mixtures thereof to increase hot fabricability;
- a sufficient concentration of boron to increase ductility;
- and
- a sufficient concentration of chromium to increase ductility at elevated temperatures in oxidizing environments.
3 more elements
Dependencies are inferred from the claim text.