US4596750A
Expired / Lapsed
US
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Support tube for high temperature solid electrolyte electrochemical cell
Assignee: Westinghouse Electric Corp
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Filing: 1985-03-15
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Granted: 1986-06-24
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Expires: 2005-03-15
Abstract
Abstract Disclosed is a compound having a fluorite-like structure comprising a solid solution having the general formula [(ZrO 2 ) 1-x (MO s ) x ] 1-y [(La m A 1-m ) 2-z (Mn n B 1-n ) z O r ] y where MO 5 is an oxide selected from the group consisting of calcia, yttria, rare earth oxides, and mixtures thereof, x is about 0.1 to 0.3, y is about 0.005 to about 0.06, z is about 0.1 to about 1.9, A is yttrium, rare earth element, alkaline earth element, or mixture thereof, B is iron, nickel, cobalt, or mixture thereof, m is 0.3 to 1, n is 0.5 to 1, and r is 2 to 4. A porous tube made from such a composition can be coated with an electrically conducting mixed oxide electrode such as lanthanum manganite, and can be used in making high temperature electrochemical cells such as solid electrolyte fuel cells.
Inventors
- 👤 Roswell J. Ruka
- 👤 Barry R. Rossing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:22
CPC Classifications
H; H01; H01M; H01M8/00; H01M8/10; H01M8/12; C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/486; H01M8/1213; H01M8/1226; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
129 words
A compound having a fluorite-like structure comprising a solid solution having the general formula [(ZrO 2 ) 1-x (MO s ) x ] 1-y [(La m A 1-m ) 2-z (Mn n B 1-n ) z O r ] y where MO s is an oxide selected from the group consisting of calcia, yttria, rare earth oxides, and mixtures thereof, x is about 0.1 to about 0.3, y is about 0.005 to about 0.06, z is about 0.1 to about 1.9, A is selected from the group consisting of yttrium, rare earth elements, alkaline earth elements, or mixture thereof, B is selected from the group consisting of Fe, Ni, Co, and mixtures thereof, m is 0.3 to 1, n is 0.5 to 1, and r is 2 to 4.
Claim 2
Dependent Claim
129 words
A compound having a fluorite-like structure comprising a solid solution having the general formula [(ZrO 2 ) 1-x (MO s ) x ] 1-y [(La m A 1-m ) 2-z (Mn n B 1-n ) z O r ] y where MO s is an oxide selected from the group consisting of calcia, yttria, rare earth oxides, and mixtures thereof, x is about 0.1 to about 0.3, y is about 0.005 to about 0.06, z is about 0.1 to about 1.9, A is selected from the group consisting of yttrium, rare earth elements, alkaline earth elements, or mixture thereof, B is selected from the group consisting of Fe, Ni, Co, and mixtures thereof, m is 0.3 to 1, n is 0.5 to 1, and r is 2 to 4.
Claim 3
Dependent Claim
13 words
A compound according to claim 1 wherein MO s is calcia or yttria.
Claim 4
Dependent Claim
11 words
A compound according to claim 1 wherein x is about 0.15.
Claim 5
Dependent Claim
14 words
A compound according to claim 1 wherein z is about 0.5 to about 1.5.
Claim 6
Dependent Claim
18 words
A support tube for an electrochemical cell comprising a tube made from a compound according to claim 1.
Claim 7
Dependent Claim
17 words
A support tube according to claim 5 including a ceramic coating on the outside of said tube.
Claim 8
Dependent Claim
26 words
A support tube according to claim 6 wherein said coating is electronically conductive and comprises a solid solution having a perovskite-like crystal structure that contains manganese.
Claim 9
Dependent Claim
39 words
A support tube according to claim 7 wherein said coating has the general formula La.sub.1-w (Ca.sub.1-v Sr.sub.v).sub.w MnO.sub.3±a. where w is about 0.1 to about 0.7, v is 0 to about 1, and a is up to about 0.1.
Claim 10
Dependent Claim
11 words
A support tube according to claim 5 closed at one end.
Claim 11
Dependent Claim
15 words
A support tube according to claim 5 sintered at a temperature greater than 1600° C.
Claim 12
Dependent Claim
21 words
In combination, a solid solution of stabilized, manganese-containing zirconia in sintered contact with an electrically conductive manganese-containing mixed oxide solid solution.
Claim 13
Dependent Claim
21 words
In combination, a solid solution of stabilized, manganese-containing zirconia in sintered contact with an electrically conductive manganese-containing mixed oxide solid solution.
Claim 14
Dependent Claim
133 words
A combination according to claim 11 wherein said manganese-containing stabilized zirconia has the general formula [(ZrO 2 ) 1-x (MO s ) x ] 1-y [(La m A 1-m ) 2-z (Mn n B 1-n ) z O r ] y where MO s is an oxide selected from the group consisting of calcia, yttria, rare earth oxides, and mixtures thereof, x is about 0.1 to about 0.3, y is about 0.005 to about 0.06, z is about 0.1 to about 1.9, r is 2 to 4, A is selected from the group yttrium, rare earth elements, alkaline earth elements, or mixtures thereof, B is selected from the group consisting of Fe, Ni, Co, and mixtures thereof, m is 0.3 to 1, n is 0.5 to 1, and r is 2 to 4.
Claim 15
Dependent Claim
13 words
A combination according to claim 12 wherein MO s is calcia or yttria.
Claim 16
Dependent Claim
11 words
A combination according to claim 12 wherein x is about 0.15.
Claim 17
Dependent Claim
42 words
A combination according to claim 11 wherein said manganese-containing mixed oxide solid solution has the general formula La.sub.1-w (Ca.sub.1-v Sr.sub.v).sub.w MnO.sub.3±a where w is about 0.1 to about 0.7, v is 0 to about 1, and a is up to about 0.1.
Claim 18
Independent Claim
68 words
A method of reducing electrochemical cell cracking due to chemical interaction between an oxide ceramic support tube and an oxide ceramic electrode that contains metal ions which can interact with the solid solution of said support tube, comprising adding sufficient amounts of said metal ions, up to the solid solution limit, to the composition from which said support tube is made to reduce the rate of said interaction.
Claim 19
Independent Claim
68 words
A method of reducing electrochemical cell cracking due to chemical interaction between an oxide ceramic support tube and an oxide ceramic electrode that contains metal ions which can interact with the solid solution of said support tube, comprising adding sufficient amounts of said metal ions, up to the solid solution limit, to the composition from which said support tube is made to reduce the rate of said interaction.
Claim 20
Dependent Claim
14 words
A method according to claim 16 wherein said metal ions include lanthanum and manganese.
Claim 21
Dependent Claim
61 words
A compound having a fluorite-like structure comprising a solid solution having the general formula [(ZrO 2 ) 1-x (MO s ) x ] 1-y [Mn] y where MO s is an oxide selected from the group consisting of calcia, yttria, rare earth oxides, and mixtures thereof, x is about 0.1 to about 0.3, and y is about 0.005 to about 0.06.
Claim 22
Dependent Claim
61 words
A compound having a fluorite-like structure comprising a solid solution having the general formula [(ZrO 2 ) 1-x (MO s ) x ] 1-y [Mn] y where MO s is an oxide selected from the group consisting of calcia, yttria, rare earth oxides, and mixtures thereof, x is about 0.1 to about 0.3, and y is about 0.005 to about 0.06.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-06-23 | 1989-12-23 | 1990-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-23 | 1993-12-23 | 1994-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-23 | 1997-12-23 | 1998-06-24 | $7700.00 | Window Closed / Lapsed |