Interconnects for solid oxide fuel cells and ferritic stainless steels adapted for use with solid oxide fuel cells
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C22C-038/22
C22C-038/26
출원번호
US-0168021
(2005-06-28)
등록번호
US-8158057
(2012-04-17)
발명자
/ 주소
Rakowski, James M.
출원인 / 주소
ATI Properties, Inc.
대리인 / 주소
K & L Gates LLP
인용정보
피인용 횟수 :
0인용 특허 :
123
초록▼
Various embodiments relate to interconnects for solid oxide fuel cells (“SOFCs”) comprising ferritic stainless steel and having at least one via that when subjected to an oxidizing atmosphere at an elevated temperature develops a scale comprising a manganese-chromate spinel on at least a portion of
Various embodiments relate to interconnects for solid oxide fuel cells (“SOFCs”) comprising ferritic stainless steel and having at least one via that when subjected to an oxidizing atmosphere at an elevated temperature develops a scale comprising a manganese-chromate spinel on at least a portion of a surface thereof, and at least one gas flow channel that when subjected to an oxidizing atmosphere at an elevated temperature develops an aluminum-rich oxide scale on at least a portion of a surface thereof. Other embodiments relate to interconnects comprising a ferritic stainless steel and having a fuel side comprising metallic material that resists oxidation during operation of the SOFCs, and optionally include a nickel-base superalloy on the oxidant side thereof. Still other embodiments relate to ferritic stainless steels adapted for use as interconnects comprising ≦0.1 weight percent aluminum and/or silicon, and 1 up to 2 weight percent manganese. Methods of making interconnects are also disclosed.
대표청구항▼
1. A ferritic stainless steel consisting of, in weight percent, from 0.6 to 1 aluminum, from 21 to 35 chromium, greater than 1 to 2 manganese, from 0.002 to 0.1 carbon, from 0 to 0.04 nitrogen, from 0.75 to 1 molybdenum, from 0 to 0.5 nickel, from 0 to 0.05 lanthanum, from 0 to 0.1 cerium, from 0 to
1. A ferritic stainless steel consisting of, in weight percent, from 0.6 to 1 aluminum, from 21 to 35 chromium, greater than 1 to 2 manganese, from 0.002 to 0.1 carbon, from 0 to 0.04 nitrogen, from 0.75 to 1 molybdenum, from 0 to 0.5 nickel, from 0 to 0.05 lanthanum, from 0 to 0.1 cerium, from 0 to 0.1 tantalum, from 0 to 0.2 niobium, iron, and impurities; wherein a sum of the weight percent cerium and the weight percent lanthanum is at least 0.03. 2. The ferritic stainless steel of claim 1 wherein the manganese ranges from 1.5 to 2.0 weight percent. 3. The ferritic stainless steel of claim 1 wherein the manganese ranges from 1.6 to 2.0 weight percent. 4. The ferritic stainless steel of claim 1 wherein the ferritic stainless steel consists of, in weight percent, from 0.6 to 1 aluminum, 21 to 24 chromium, greater than 1 to 2 manganese, from 0.002 to 0.1 carbon, from 0 to 0.04 nitrogen, from 0.75 to 1 molybdenum, from 0 to 0.3 nickel, from 0.02 to 0.04 lanthanum, from 0 to 0.1 tantalum, from 0 to 0.1 niobium, cerium, iron, and impurities, wherein a sum of the weight percent cerium and the weight percent lanthanum ranges from 0.03 to 0.06. 5. The ferritic stainless steel of claim 4 wherein manganese ranges from 1.5 to 2 weight percent. 6. The ferritic stainless steel of claim 4 wherein manganese ranges from 1.6 to 2 weight percent. 7. The ferritic stainless steel of claim 1 wherein the ferritic stainless steel consists of, in weight percent, from 0.6 to 1 aluminum, from 23 to 27 chromium, greater than 1 to 2 manganese, from 0.002 to 0.1 carbon, from 0 to 0.04 nitrogen, from 0.75 to 1 molybdenum, from 0 to 0.3 nickel, from 0 to 0.05 lanthanum, from 0 to 0.1 cerium, from 0 to 0.1 tantalum, from 0.05 to 0.2 niobium, iron, and impurities; wherein a sum of the weight percent cerium and the weight percent lanthanum is at least 0.03. 8. The ferritic stainless steel of claim 7 wherein manganese ranges from 1.5 to 2 weight percent. 9. The ferritic stainless steel of claim 7 wherein manganese ranges from 1.6 to 2 weight percent. 10. An interconnect comprising a ferritic stainless steel according to claim 1. 11. A ferritic stainless steel consisting of, in weight percent, from 0.6 to 1 aluminum, from 0 to less than 0.1 silicon, from 21 to 24 chromium, greater than 1 to 2 manganese, from 0.002 to 0.1 carbon, from 0 to 0.04 nitrogen, from 0 to 1 molybdenum, from 0 to 0.5 nickel, from 0.02 to 0.04 lanthanum, from 0 to 0.1 cerium, from 0 to 0.1 tantalum, iron, and impurities; wherein a sum of the weight percent cerium and the weight percent lanthanum is at least 0.03. 12. The ferritic stainless steel of claim 11 wherein the manganese ranges from 1.5 to 2.0 weight percent. 13. The ferritic stainless steel of claim 11 wherein the manganese ranges from 1.6 to 2.0 weight percent. 14. An interconnect comprising a ferritic stainless steel according to claim 11. 15. A ferritic stainless steel consisting of, in weight percent, from 0.6 to 1 aluminum, from 21 to 35 chromium, 1.5 to 2 manganese, from 0.002 to 0.1 carbon, from 0 to 0.04 nitrogen, from 0.75 to 1 molybdenum, from 0 to 0.5 nickel, from 0 to 0.05 lanthanum, from 0 to 0.1 cerium, from 0 to 0.1 tantalum, from 0 to 0.2 niobium, iron, and impurities; wherein a sum of the weight percent cerium and the weight percent lanthanum is at least 0.03. 16. A ferritic stainless steel consisting of, in weight percent, from 0.6 to 1 aluminum, from 0 to less than 0.1 silicon, from 21 to 24 chromium, 1.5 to 2 manganese, from 0.002 to 0.1 carbon, from 0 to 0.04 nitrogen, from 0 to 1 molybdenum, from 0 to 0.5 nickel, from 0.02 to 0.04 lanthanum, from 0 to 0.1 cerium, from 0 to 0.1 tantalum, iron, and impurities; wherein a sum of the weight percent cerium and the weight percent lanthanum is at least 0.03.
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