Nickel base alloys having a low coefficient of thermal...

Details Nickel base alloys having a low coefficient of thermal... Nickel base alloys having a low coefficient of thermal...

C - Chemistry, Metallurgy

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C22C 19/05 (2006.01) B23K 35/30 (2006.01) C22C 27/00 (2006.01)

Patent

CA 1044921

PATENT APPLICATION OF JAMES F. BALDWIN AND DOUGLAS H. MAXWELL FOR NICKEL-BASE ALLOYS HAVING A LOW COEFFICIENT OF THERMAL EXPANSION ABSTRACT OF THE DISCLOSURE Alloy compositions consisting predominantly of nickel, chromium, molybdenum, carbon, and boron are disclosed. The alloys possess a duplex structure consisting of a nickel-chromium-molybdenum matrix and a semi-continuous network of refractory carbides and borides. A combina- tion of desirable properties is provided by these alloys, including elevated temperature strength, resistance to oxidation and hot corrosion, and a very low coefficient of thermal expansion. The nickel base alloys of this invention are particularly useful for making hard facing welding rods both in cast wire and powder form; components for use in the glass forming industry; and components for use in hot sections of gas turbine engines, such as integral wheels, turbine shrouds, cases, seals, and the like.

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