Title:
OXIDATION RESISTANT FERRITIC STAINLESS STEELS
Document Type and Number:
WIPO Patent Application WO2005024098
Kind Code:
A3
Abstract:
A method for making a ferritic stainless steel article having an oxidation resistant surface includes providing a ferritic stainless steel comprising aluminum, at least one rare earth metal and 16 to less than 30 weight percent chromium, wherein the total weight of rare earth metals is greater than 0.02 weight percent. At least one surface of the ferritic stainless steel is modified so that, when subjected to an oxidizing atmosphere at high temperature, the modified surface develops an electrically conductive, aluminum-rich, oxidation resistant oxide scale comprising chromium and iron and a having a hematite structure differing from Fe2O3, alpha Cr2O3 and alpha Al2O3. The modified surface may be provided, for example, by electrochemically modifying the surface, such as by electropolishing the surface.
Inventors:
RAKOWSKI JAMES A (US)
Application Number:
PCT/US2004/028243
Publication Date:
August 25, 2005
Filing Date:
August 30, 2004
Export Citation:
Assignee:
ATI PROPERTIES INC (US)
RAKOWSKI JAMES A (US)
RAKOWSKI JAMES A (US)
International Classes:
C23C8/10; C23C8/18; C25F3/24; H01M8/02; (IPC1-7): C25F3/24; H01M8/02
Domestic Patent References:
| WO2002013300A1 | 2002-02-14 | |||
| WO2003006149A1 | 2003-01-23 |
Foreign References:
| US20030116536A1 | 2003-06-26 |
Other References:
HORITA T ET AL: "Stability of Fe-Cr alloy interconnects under CH4-H2O atmosphere for SOFCs", JOURNAL OF POWER SOURCES, ELSEVIER SEQUOIA S.A. LAUSANNE, CH, vol. 118, no. 1-2, 25 May 2003 (2003-05-25), pages 35 - 43, XP004425661, ISSN: 0378-7753
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 02 28 February 1997 (1997-02-28)
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 02 28 February 1997 (1997-02-28)
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