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Iron aluminide useful as electrical resistance heating elements

United States Patent

August 28, 2001
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
The invention relates generally to aluminum containing iron-base alloys useful as electrical resistance heating elements. The aluminum containing iron-base alloys have improved room temperature ductility, electrical resistivity, cyclic fatigue resistance, high temperature oxidation resistance, low and high temperature strength, and/or resistance to high temperature sagging. The alloy has an entirely ferritic microstructure which is free of austenite and includes, in weight %, over 4% Al, .ltoreq.1% Cr and either .gtoreq.0.05% Zr or ZrO.sub.2 stringers extending perpendicular to an exposed surface of the heating element or .gtoreq.0.1% oxide dispersoid particles. The alloy can contain 14-32% Al, .ltoreq.2% Ti, .ltoreq.2% Mo, .ltoreq.1% Zr, .ltoreq.1% C, .ltoreq.0.1% B, .ltoreq.30% oxide dispersoid and/or electrically insulating or electrically conductive covalent ceramic particles, .ltoreq.1% rare earth metal, .ltoreq.1% oxygen, .ltoreq.3% Cu, balance Fe.
Sikka; Vinod K. (Oak Ridge, TN), Deevi; Seetharama C. (Oak Ridge, TN), Fleischhauer; Grier S. (Midlothian, VA), Hajaligol; Mohammad R. (Richmond, VA), Lilly, Jr.; A. Clifton (Chesterfield, VA)
Chrysalis Technologies Incorporated (Richmond, VA)
09/ 399,355
September 20, 1999
The United States Government has rights in this invention pursuant to Contract No. DE-AC05-84OR21400 between the United States Department of Energy and Martin Marietta Energy Systems, Inc.