Iron aluminide useful as electrical resistance heating elements

Patent · Mon Jan 01 00:00:00 EST 2001

OSTI ID:873951

Sikka, Vinod K ^[1]; Deevi, Seetharama C ^[1]; Fleischhauer, Grier S ^[2]; Hajaligol, Mohammad R ^[3]

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1. Oak Ridge, TN
2. Midlothian, VA
3. Richmond, VA

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: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• DOE Contract Number: AC05-84OR21400
• Assignee: Chrysalis Technologies Incorporated (Richmond, VA)
• Patent Number(s): US 6280682
• OSTI ID: 873951
• Country of Publication: United States
• Language: English

Related Subjects

iron
aluminide
useful
electrical
resistance
heating
elements
relates
aluminum
containing
iron-base
alloys
improved
temperature
ductility
resistivity
cyclic
fatigue
oxidation
strength
sagging
alloy
entirely
ferritic
microstructure
free
austenite
weight
ltoreq
gtoreq
05
zr
zro
stringers
extending
perpendicular
exposed
surface
element
oxide
dispersoid
particles
contain
14-32
30
electrically
insulating
conductive
covalent
ceramic
rare
earth
metal
oxygen
cu
balance
temperature sagging
aluminum containing
oxide dispersoid
base alloy
base alloys
aluminide useful
entirely ferritic
fatigue resistance
ferritic microstructure
containing iron-base
conductive covalent
iron-base alloys
cyclic fatigue
covalent ceramic
temperature strength
heating elements
resistance heating
exposed surface
oxidation resistance
temperature ductility
heating element
ceramic particles
electrically insulating
electrically conductive
rare earth
earth metal
electrical resistance
electrical resistivity
iron aluminide
ceramic particle
temperature oxidation
stringers extending
extending perpendicular
containing iron
alloys useful
dispersoid particles
resistance heat
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