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Iron aluminide useful as electrical resistance heating elements

Patent ·
OSTI ID:870902
 [1];  [1];  [2];  [3]
  1. Oak Ridge, TN
  2. Midlothian, VA
  3. Richmond, VA
+ Show Author Affiliations

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.

Research Organization:
LOCKHEED MARTIN ENRGY SYST INC
DOE Contract Number:
AC05-84OR21400
Assignee:
Philip Morris Incorporated (New York, NY)
Patent Number(s):
US 5620651
OSTI ID:
870902
Country of Publication:
United States
Language:
English

References (4)

The effect of ternary additions on the vacancy hardening of FeAl journal April 1994
Microstructure and tensile properties of Fe-40 At. pct Al alloys with C, Zr, Hf, and B additions journal September 1989
Powder Processing of Fe 3 Al-Based Iron-Aluminide Alloys journal January 1990
A review of recent developments in Fe 3 Al-based alloys journal August 1991

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