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Title: Iron aluminide useful as electrical resistance heating elements

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, {<=}1% Cr and either {>=}0.05% Zr or ZrO{sub 2} stringers extending perpendicular to an exposed surface of the heating element or {>=}0.1% oxide dispersoid particles. The alloy can contain 14-32% Al, {<=}2% Ti, {<=}2% Mo, {<=}1% Zr, {<=}1% C, {<=}0.1% B, {<=}30% oxide dispersoid and/or electrically insulating or electrically conductive covalent ceramic particles, {<=}1% rare earth metal, {<=}1% oxygen, {<=}3% Cu, balance Fe. 64 figs.

Inventors:
; ; ; ;
Issue Date:
Research Org.:
Lockheed Martin Energy Syst Inc
OSTI Identifier:
462858
Patent Number(s):
5,620,651
Application Number:
PAN: 8-426,006
Assignee:
Philip Morris Inc., New York, NY (United States)
DOE Contract Number:  
AC05-84OR21400
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 15 Apr 1997
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; IRON BASE ALLOYS; ALUMINIUM ALLOYS; ELECTRIC APPLIANCES; ELECTRIC CONDUCTIVITY; MICROSTRUCTURE; CHEMICAL COMPOSITION; CORROSION RESISTANCE; MECHANICAL PROPERTIES

Citation Formats

Sikka, V K, Deevi, S C, Fleischhauer, G S, Hajaligol, M R, and Lilly, Jr, A C. Iron aluminide useful as electrical resistance heating elements. United States: N. p., 1997. Web.
Sikka, V K, Deevi, S C, Fleischhauer, G S, Hajaligol, M R, & Lilly, Jr, A C. Iron aluminide useful as electrical resistance heating elements. United States.
Sikka, V K, Deevi, S C, Fleischhauer, G S, Hajaligol, M R, and Lilly, Jr, A C. Tue . "Iron aluminide useful as electrical resistance heating elements". United States.
@article{osti_462858,
title = {Iron aluminide useful as electrical resistance heating elements},
author = {Sikka, V K and Deevi, S C and Fleischhauer, G S and Hajaligol, M R and Lilly, Jr, A C},
abstractNote = {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, {<=}1% Cr and either {>=}0.05% Zr or ZrO{sub 2} stringers extending perpendicular to an exposed surface of the heating element or {>=}0.1% oxide dispersoid particles. The alloy can contain 14-32% Al, {<=}2% Ti, {<=}2% Mo, {<=}1% Zr, {<=}1% C, {<=}0.1% B, {<=}30% oxide dispersoid and/or electrically insulating or electrically conductive covalent ceramic particles, {<=}1% rare earth metal, {<=}1% oxygen, {<=}3% Cu, balance Fe. 64 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1997},
month = {4}
}