Alloys or metallic compositions – Ferrous – Four percent or more aluminum containing
Patent
1995-04-20
1997-04-15
Yee, Deborah
Alloys or metallic compositions
Ferrous
Four percent or more aluminum containing
148328, C22C 3806
Patent
active
056206518
ABSTRACT:
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.
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Deevi Seetharama C.
Fleischhauer Grier S.
Hajaligol Mohammad R.
Lilly, Jr. A. Clifton
Sikka Vinod K.
Philip Morris Incorporated
Yee Deborah
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