The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 20, 2002
Filed:
Apr. 19, 2001
Process for preparing aligned in-situ two phase single crystal composites of titanium-niobium alloys
Rabindra Mahapatra, Port Tobacco, MD (US);
Eui W. Lee, Maple Glen, PA (US);
Jeffrey Waldman, Huntington Valley, PA (US);
John H. Perepezko, Madison, WI (US);
The United States of America as represented by the Secretary of the Navy, Washington, DC (US);
Abstract
A process of preparing aligned, in-situ, two-phase single crystal alloys of titanium, aluminum and niobium which comprises growing the alloys at rates of about 3.0 mm. to about 6.0 mm. per hour by rotating a seed rod alloy consisting essentially of Ti-43 to 45 Al-10 to 12 Nb+0.5 Si, in atomic percent, at about 7.75 to 8.25 RPM while in contact with a rotating feed rod alloy consisting essentially of Ti-43 to 45 Al-10 to 12 Nb, in atomic-percent, rotating at about 5.75 to 6.25 RPM in an atmosphere of substantially pure argon at melt temperatures ranging from about 1650° C. to 1750° C. to obtain two-phase single crystal alloys of Ti-43 to 45Al-10 to 12 Nb characterized as having improved ductility, excellent oxidation resistance, and high-temperature creep strength. These alloys are particularly useful for manufacturing high-temperature material components for internal combustion engines, gas turbines, and advanced aircraft engines.