Patent US5453331A successfully refreshed from Google Patents.
US5453331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compliant sealants for solid oxide fuel cells and other ceramics
Assignee: UChicago Argonne LLC
•
Filing: 1994-08-12
•
Granted: 1995-09-26
•
Expires: 2014-08-12
Abstract
Abstract A glass or glass-ceramic sealant for a SOFC having a coefficient of thermal expansion in the range of from about 8 to about 13×10 -6 /°C. and a viscosity of at least 10 3 Pa-s at cell operating temperature. The sealant has a composition of SrO present in the range of from about 5 to about 60 mole percent, La 2 O 3 present in the range of from 0 to about 45 mole percent, Al 2 O 3 present in the range from 0 to about 15 mole percent, B 2 O 3 present in the range of from about 15 mole percent to about 80 mole percent, and SiO 2 present in the range of from 0 to about 40 mole percent, wherein the material is a viscous fluid at cell operating temperatures of from about 600° C. to about 1000° C. The sealant may also be compounds of CaO present in the range of from 0 to about 35 mole percent, Al 2 O 3 present in the range from 0 to about 15 mole percent, B 2 O 3 present in the range of from about 35 mole percent to about 85 mole percent, and SiO 2 present in the range of from 0 to about 30 mole percent.
Inventors
- 👤 Ira D. Bloom
- 👤 Kevin L. Ley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:06
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C3/068; C03C8/00; C03C8/24; H; H01; H01M; H01M8/00; H01M8/02; H01M8/0271; H01M8/10; H01M8/12; H01M2008/1293; H01M2300/00; H01M2300/0017; H01M2300/0065; H01M2300/0068; H01M2300/0071; H01M2300/0074; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
133 words
A glass or glass-ceramic sealant for a SOFC comprising a material having a coefficient of thermal expansion in the range of from about 8 to about 13×10 -6 /°C. having a composition of SrO present in the range of from about 5 to about 60 mole percent, La 2 O 3 present in the range of from about 1 to about 45 mole percent, Al 2 O 3 present in the range from 0 to about 15 mole percent, B 2 O 3 present in the range of from about 15 mole percent to about 80 mol %, and SiO 2 present in the range of from 0 to about 40 mol %, wherein the material is a viscous fluid at cell operating temperatures of from about 600° C. to about 1000° C.
Claim 2
Dependent Claim
133 words
A glass or glass-ceramic sealant for a SOFC comprising a material having a coefficient of thermal expansion in the range of from about 8 to about 13×10 -6 /°C. having a composition of SrO present in the range of from about 5 to about 60 mole percent, La 2 O 3 present in the range of from about 1 to about 45 mole percent, Al 2 O 3 present in the range from 0 to about 15 mole percent, B 2 O 3 present in the range of from about 15 mole percent to about 80 mol %, and SiO 2 present in the range of from 0 to about 40 mol %, wherein the material is a viscous fluid at cell operating temperatures of from about 600° C. to about 1000° C.
Claim 3
Dependent Claim
45 words
The sealant of claim 1, herein the constituents are present as 28.7 mole % SrO; 20.2 mole % La 2 O 3 , 10 mole % Al 2 O 3 , 36.6 mole % B 2 O 3 and 4.6 mole % SiO 2 .
Claim 4
Dependent Claim
45 words
The sealant of claim 1, wherein the constituents are present as 32.1 mole % SrO, 3.3 mole % La 2 O 3 , 15.8 mol % Al 2 O 3 , 41.6 mole % B 2 O 3 and 7.3 mole % SiO 2 .
Claim 5
Dependent Claim
24 words
The sealant of claim 1, wherein the coefficient of thermal expansion is in the range of from about 11 to about 13×10 -6 /°C.
Claim 6
Dependent Claim
18 words
The sealant of claim 1, wherein the sealant has a glass transition temperature below the SOFC operating temperature.
Claim 7
Dependent Claim
19 words
The sealant of claim 1, wherein the sealant viscosity at cell operating temperature is at least 10 3 Pa-s.
Claim 8
Dependent Claim
21 words
The sealant of claim 1, wherein the sealant viscosity at cell operating temperature is not greater than about 10 12 Pa-s.
Claim 9
Dependent Claim
199 words
A solid oxide fuel cell for electrochemically reacting a fuel gas with a flowing oxidant gas at an elevated temperature in producing a DC output voltage, said solid oxide fuel cell comprising a plurality of generally planar conductive sheets of thin layers of ceramic anode and cathode materials and a thin layer of ceramic ion conducting electrolyte disposed therebetween, wherein said ceramics include manganite and zirconias, a glass or glass-ceramic sealant for connecting adjacent sheets, said sealant having a coefficient of thermal expansion in the range of from about 8 to about 13×10 -6 /°C. having a composition of SrO present in the range of from about 5 to about 60 mole %, La 2 O 3 present in the range of from about 1 to about 45 mole %, Al 2 O 3 present in the range from 0 to about 15 mole %, B 2 O 3 present in the range of from about 15 mole %, to about 80 mole %, and SiO 2 present in the range of from 0 to about 40 mole %, wherein the material is a viscous fluid at cell operating temperatures of from about 600° C. to about 1000° C.
Claim 10
Dependent Claim
199 words
A solid oxide fuel cell for electrochemically reacting a fuel gas with a flowing oxidant gas at an elevated temperature in producing a DC output voltage, said solid oxide fuel cell comprising a plurality of generally planar conductive sheets of thin layers of ceramic anode and cathode materials and a thin layer of ceramic ion conducting electrolyte disposed therebetween, wherein said ceramics include manganite and zirconias, a glass or glass-ceramic sealant for connecting adjacent sheets, said sealant having a coefficient of thermal expansion in the range of from about 8 to about 13×10 -6 /°C. having a composition of SrO present in the range of from about 5 to about 60 mole %, La 2 O 3 present in the range of from about 1 to about 45 mole %, Al 2 O 3 present in the range from 0 to about 15 mole %, B 2 O 3 present in the range of from about 15 mole %, to about 80 mole %, and SiO 2 present in the range of from 0 to about 40 mole %, wherein the material is a viscous fluid at cell operating temperatures of from about 600° C. to about 1000° C.
Claim 11
Dependent Claim
49 words
The solid oxide fuel cell of claim 8, wherein the sealant constituents are present as 28.7 mole % SrO; 20.2 mole % La 2 O 3 , 10 mole % Al 2 O 3 , 36.6 mole % B 2 O 3 and 4.6 mole % SiO 2 .
Claim 12
Dependent Claim
49 words
The solid oxide fuel cell of claim 8, wherein the sealant constituents are present as 32.1 mole % SrO, 3.3 mole % La 2 O 3 , 15.8 mole % Al 2 O 3 , 41.6 mole % B 2 O 3 and 7.3 mole % SiO 2 .
Claim 13
Dependent Claim
53 words
The solid oxide fuel cell of claim 8, wherein the coefficient of thermal expansion is in the range of from about 11 to about 13×10 -6 /°C., the sealant has a glass transition temperature below the SOFC operating temperature, and the sealant viscosity at cell operating temperature is at least 10 3 Pa-S.
Claim 14
Dependent Claim
199 words
A solid oxide fuel cell for electrochemically reacting a fuel gas with a flowing oxidant gas at an elevated temperature in producing a DC output voltage, said solid oxide fuel cell comprising a plurality of generally planar conductive sheets of thin layers of ceramic anode and cathode materials and a thin layer of ceramic ion conducting electrolyte disposed therebetween, wherein said ceramics include manganite and zirconias, a glass or glass-ceramic sealant for connecting adjacent sheets, said sealant having a coefficient of thermal expansion in the range of from about 8 to about 13×10 -6 /°C. having a composition of SrO present in the range of from about 5 to about 60 mole %, La 2 O 3 present in the range of from about 3 to about 45 mole %, Al 2 O 3 present in the range from 0 to about 15 mole %, B 2 O 3 present in the range of from about 15 mole % to about 80 mole %, and SiO 2 present in the range of from 0 to about 40 mole %, wherein the material is a viscous fluid at cell operating temperatures of from about 600° C. to about 1000° C.
Claim 15
Dependent Claim
199 words
A solid oxide fuel cell for electrochemically reacting a fuel gas with a flowing oxidant gas at an elevated temperature in producing a DC output voltage, said solid oxide fuel cell comprising a plurality of generally planar conductive sheets of thin layers of ceramic anode and cathode materials and a thin layer of ceramic ion conducting electrolyte disposed therebetween, wherein said ceramics include manganite and zirconias, a glass or glass-ceramic sealant for connecting adjacent sheets, said sealant having a coefficient of thermal expansion in the range of from about 8 to about 13×10 -6 /°C. having a composition of SrO present in the range of from about 5 to about 60 mole %, La 2 O 3 present in the range of from about 3 to about 45 mole %, Al 2 O 3 present in the range from 0 to about 15 mole %, B 2 O 3 present in the range of from about 15 mole % to about 80 mole %, and SiO 2 present in the range of from 0 to about 40 mole %, wherein the material is a viscous fluid at cell operating temperatures of from about 600° C. to about 1000° C.
Claim 16
Dependent Claim
54 words
The solid oxide fuel cell of claim 12, wherein the sealant coefficient of thermal expansion is in the range of from about 11 to about 13×10 -6 /°C., the sealant has a glass transition temperature below the SOFC operating temperature, and the sealant viscosity at cell operating temperature is at least 10 3 Pa-s.
References Cited (Backward Citations)
US4291107A
Cited
US4476196A
Cited
US4476198A
Cited
US4476197A
Cited
US4499663A
Cited
US4666798A
Cited
US4833049A
Cited
US4761349A
Cited
US5021307A
Cited
US5164342A
Cited
US4997726A
Cited
US5169506A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-09-25 | 1999-03-27 | 1999-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-09-25 | 2003-03-27 | 2003-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-09-25 | 2007-03-27 | 2007-09-26 | $7700.00 | Window Closed / Lapsed |