US4328296A
Expired / Lapsed
US
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Solid electrolyte for use in oxygen concentration sensor
Assignee: Denso Corp
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Filing: 1981-02-05
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Granted: 1982-05-04
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Expires: 2001-02-05
Abstract
Abstract A solid electrolyte for an oxygen concentration sensor is provided by mixing ZrO 2 and about 6.5 to 7% by mol of a stabilizer such as Y 2 O 3 , grinding the mixture to give a BET specific surface area of about 9 to 20 m 2 /g, adding to the ground mixture a forming aid, forming the mixture into a predetermined configuration and firing the formed mixture at about 1420° to 1480° C. The electrolyte has a surface-average grain size of about 5 microns or less and a structure of a cubic phase and a monoclinic and/or tetragonal phase at the surface thereof and, furthermore, may contain about 5% or less of a monoclinic phase per the total of the cubic and monoclinic phases, in a finely ground state.
Inventors
- 👤 Katsuhiko Tanaka
- 👤 Toshitaka Saito
- 👤 Masatoshi Suzuki
- 👤 Masami Ouki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:32
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/407; G01N27/4073; C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/486; H; H01; H01M; H01M8/00; H01M8/10; H01M8/12; H01M8/124; H01M8/1246; H01M8/1253; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
89 words
A solid electrolyte for an oxygen concentration sensor, consisting essentially of a sintered body of partially stabilized zirconia having a crystal structure including crystal grains of a cubic phase and a monoclinic and/or tetragonal phase and having a surface-average grain size of about 5 microns or less, said structure being changed, on finely grinding, into a structure in which a cubic phase and a monoclinic phase coexist and the proportion of the monoclinic phase is about 5% or less by weight based on the total of both the phases.
Claim 2
Dependent Claim
89 words
A solid electrolyte for an oxygen concentration sensor, consisting essentially of a sintered body of partially stabilized zirconia having a crystal structure including crystal grains of a cubic phase and a monoclinic and/or tetragonal phase and having a surface-average grain size of about 5 microns or less, said structure being changed, on finely grinding, into a structure in which a cubic phase and a monoclinic phase coexist and the proportion of the monoclinic phase is about 5% or less by weight based on the total of both the phases.
Claim 3
Dependent Claim
23 words
The solid electrolyte according to claim 1, wherein the sintered body of partially stabilized zirconia contains Y 2 O 3 as a stabilizer.
Claim 4
Dependent Claim
20 words
The solid electrolyte according to claim 1, wherein the sintered body of partially stabilized zirconia contains CaO as a stabilizer.
Claim 5
Dependent Claim
20 words
The solid electrolyte according to claim 1, wherein the sintered body of partially stabilized zirconia contains MgO as a stabilizer.
Claim 6
Dependent Claim
23 words
The solid electrolyte according to claim 1, wherein the sintered body of partially stabilized zirconia contains Yb 2 O 3 as a stabilizer.
Claim 7
Dependent Claim
23 words
The solid electrolyte according to claim 1, wherein the sintered body of partially stabilized zirconia contains Sc 2 O 3 as a stabilizer.
Claim 8
Dependent Claim
26 words
The electrolyte according to claim 2, 3, 4, 5 or 6, wherein the stabilizer is contained in an amount of about 6.5 to 7% by mol.
Claim 9
Dependent Claim
56 words
The electrolyte according to claim 2, 3, 4, 5 or 6, wherein the sintered body contains as a sintering promotor about 1 to 5% by weight of Al 2 O 3 or about 0.2 to 2% by weight of SiO 2 , both the percentages being based on the total of ZrO 2 and the stabilizer.
Claim 10
Dependent Claim
103 words
A solid electrolyte for an oxygen concentration sensor, consisting essentially of a sintered body of partially stabilized zirconia having a crystal structure including crystal grains of a cubic phase and a monoclinic and/or tetragonal phase and from about 6.5 to about 7 mol percent of a zirconia stabilizer, said zirconia having a surface-average grain size of about 5 microns or less, said structure being changed, on finely grinding, into a structure in which a cubic phase and a monoclinic phase coexist and the proportion of the monoclinic phase is about 5% or less by weight based on the total of both the phases.
Claim 11
Dependent Claim
103 words
A solid electrolyte for an oxygen concentration sensor, consisting essentially of a sintered body of partially stabilized zirconia having a crystal structure including crystal grains of a cubic phase and a monoclinic and/or tetragonal phase and from about 6.5 to about 7 mol percent of a zirconia stabilizer, said zirconia having a surface-average grain size of about 5 microns or less, said structure being changed, on finely grinding, into a structure in which a cubic phase and a monoclinic phase coexist and the proportion of the monoclinic phase is about 5% or less by weight based on the total of both the phases.
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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) | 1985-05-03 | 1985-11-02 | 1986-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-03 | 1989-11-02 | 1990-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-03 | 1993-11-02 | 1994-05-04 | $7700.00 | Window Closed / Lapsed |