US4310402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas tight sealant for zirconia sensors
Assignee: Rosemount Inc
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Filing: 1980-11-05
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Granted: 1982-01-12
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Expires: 2000-11-05
Abstract
Abstract In a high temperature gas measuring device consisting of a zirconia oxide solid electrolyte cell bonded to a support member, a sealant exhibiting a thermal coefficient of expansion comparable to zirconia and a melting point in excess of 1000 DEG C. is used to seal the cell to the support member. The preferred sealants which meet these requirements include: (1) 3 MgO.Al2O3.6 SiO2 (2) 52% Nd4(SiO4)3, 48% Ca2SiO4 (3) 57% La4(SiO4)3, 43% Ca2SiO4 (4) 50% Y4(SiO4)3, 50% Ca2SiO4 (5) (a) La2O3.Al2O3: 50 mol % of each (b) 40% La2O3.60% Al2O3.
Inventors
- 👤 Arnold O. Isenberg
- 👤 David F. Bradley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:38
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/21; G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/407; G01N27/4073; H01M; H01M8/00; H01M8/02; H01M8/0271; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
132 words
In a gas-sensing apparatus having a zirconia solid electrolyte electrochemical cell sealed to a support member for measuring a gas constituent of interest at a temperature of approximately 600° C. or higher, the combination of: a support member having a coefficient of thermal expansion approximating that of zirconia, and a sealant composition having a coefficient of thermal expansion which is within a range of ±10% of the coefficient of thermal expansion of zirconia and a melting point at a temperature in excess of 1000° C., for sealing said zirconia solid electrolyte electrochemical cell to said support member, said sealant composition being selected from the following formulations: (a) La 2 O 3 .Al 2 O 3 :approximately 50 mol% of each (b) 40% La 2 O 3 .60% Al 2 O 3 .
Claim 2
Dependent Claim
132 words
In a gas-sensing apparatus having a zirconia solid electrolyte electrochemical cell sealed to a support member for measuring a gas constituent of interest at a temperature of approximately 600° C. or higher, the combination of: a support member having a coefficient of thermal expansion approximating that of zirconia, and a sealant composition having a coefficient of thermal expansion which is within a range of ±10% of the coefficient of thermal expansion of zirconia and a melting point at a temperature in excess of 1000° C., for sealing said zirconia solid electrolyte electrochemical cell to said support member, said sealant composition being selected from the following formulations: (a) La 2 O 3 .Al 2 O 3 :approximately 50 mol% of each (b) 40% La 2 O 3 .60% Al 2 O 3 .
Claim 3
Dependent Claim
121 words
In a gas-sensing apparatus having a zirconia solid electrolyte electrochemical cell sealed to a support member for measuring a gas constituent of interest at a temperature of 600° C. or higher, the combination of: a support member having a coefficient of thermal expansion approximating that of zirconia, and a sealant composition having a coefficient of thermal expansion which is within a range of ±10% of the coefficient of thermal expansion of zirconia and a melting point at a temperature in excess of 1000° C. to seal said zirconia solid electrolyte electrochemical cell to said support member, said sealant composition consisting of a mixture of a rare earth oxide selected from the group consisting of neodymium oxide, lanthanum oxide and yttrium oxide,
Claim 4
Dependent Claim
121 words
In a gas-sensing apparatus having a zirconia solid electrolyte electrochemical cell sealed to a support member for measuring a gas constituent of interest at a temperature of 600° C. or higher, the combination of: a support member having a coefficient of thermal expansion approximating that of zirconia, and a sealant composition having a coefficient of thermal expansion which is within a range of ±10% of the coefficient of thermal expansion of zirconia and a melting point at a temperature in excess of 1000° C. to seal said zirconia solid electrolyte electrochemical cell to said support member, said sealant composition consisting of a mixture of a rare earth oxide selected from the group consisting of neodymium oxide, lanthanum oxide and yttrium oxide,
Claim 5
Dependent Claim
104 words
In a gas-sensing apparatus having a zirconia solid electrolyte electrochemical cell sealed to a support member for measuring a gas constituent of interest at a temperature of approximately 600° C. or higher, the combination of: a support member having a coefficient of thermal expansion approximating that of zirconia, and a sealant composition of silicates and rare earth element oxides having a coefficient of thermal expansion which is within a range of ±10% of the coefficient of thermal expansion of zirconia and a melting point at a temperature in excess of 1000° C. for sealing said zirconia solid electrolyte electrochemical cell to said support member.
Claim 6
Dependent Claim
104 words
In a gas-sensing apparatus having a zirconia solid electrolyte electrochemical cell sealed to a support member for measuring a gas constituent of interest at a temperature of approximately 600° C. or higher, the combination of: a support member having a coefficient of thermal expansion approximating that of zirconia, and a sealant composition of silicates and rare earth element oxides having a coefficient of thermal expansion which is within a range of ±10% of the coefficient of thermal expansion of zirconia and a melting point at a temperature in excess of 1000° C. for sealing said zirconia solid electrolyte electrochemical cell to said support member.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-11 | 1985-07-13 | 1986-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-11 | 1989-07-13 | 1990-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-11 | 1993-07-13 | 1994-01-12 | $7700.00 | Window Closed / Lapsed |