US4219359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sintered body of zirconia for oxygen concentration sensor
Assignee: Denso Corp
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Filing: 1979-03-21
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Granted: 1980-08-26
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Expires: 1999-03-21
Abstract
Abstract A sintered body of zirconia material for an oxygen concentration sensor exhibiting an electromotive force in accordance with the difference in the concentration of oxygen between a gas tested and a reference gas, consisting essentially of partially stabilized sintered zirconia and at least one additive selected from the group of yttrium oxide, calcium oxide and ytterbium oxide which zirconia has a cubic phase and a monoclinic phase existing in mingling relation. The ratio of the X-ray diffraction intensity of the surface (111) of the monoclinic phase to the X-ray diffraction intensity of the surface (111) of the cubic phase or the ratio I(111)/I(111) is in the range between 0.05 and 0.40, and the value of the X-ray diffraction intensity ratio caused by heating the sintered zirconia material to, and holding the same at, the temperature range between 200° and 300° C. minus the former ratio of the X-ray diffraction intensity is in the range between -0.05 and +0.10.
Inventors
- 👤 Naoto Miwa
- 👤 Masami Ouki
- 👤 Katsuhiko Tanaka
- 👤 Masatosi Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:52
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: 7
Claim 1
Independent Claim
194 words
A sintered body of zirconium oxide material for an oxygen concentration sensor exhibiting an electromotive force in accordance with the difference in the concentration of oxygen between a gas to be tested and a reference gas, consisting essentially of partially stabilized zirconium oxide and at least one additive selected from the group of yttrium oxide, calcium oxide and ytterbium oxide which zirconium oxide has cubic and monoclinic phases both existing in mingling relation, said additive being solid-soluted in zirconium oxide, wherein the ratio of the X-ray diffraction intensity of the surface (111) of the monoclinic phase to the X-ray diffraction intensity of the surface (111) of the cubic phase, or the X-ray diffraction intensity ratio I(111)/I(111), is in the range between 0.05 and 0.40, and the changes in value of the X-ray diffraction intensity ratio I(111)/I(111) caused by heating and holding the partially stabilized sintered material of zirconium oxide at the range between 200° and 300° C. minus the initial X-ray diffraction intensity ratio I(111)/I(111) obtained before heating and holding the partially stabilized sintered material of zirconium oxide at the range between 200° and 300° C. are in the range between -0.05 and +0.10.
Claim 2
Dependent Claim
194 words
A sintered body of zirconium oxide material for an oxygen concentration sensor exhibiting an electromotive force in accordance with the difference in the concentration of oxygen between a gas to be tested and a reference gas, consisting essentially of partially stabilized zirconium oxide and at least one additive selected from the group of yttrium oxide, calcium oxide and ytterbium oxide which zirconium oxide has cubic and monoclinic phases both existing in mingling relation, said additive being solid-soluted in zirconium oxide, wherein the ratio of the X-ray diffraction intensity of the surface (111) of the monoclinic phase to the X-ray diffraction intensity of the surface (111) of the cubic phase, or the X-ray diffraction intensity ratio I(111)/I(111), is in the range between 0.05 and 0.40, and the changes in value of the X-ray diffraction intensity ratio I(111)/I(111) caused by heating and holding the partially stabilized sintered material of zirconium oxide at the range between 200° and 300° C. minus the initial X-ray diffraction intensity ratio I(111)/I(111) obtained before heating and holding the partially stabilized sintered material of zirconium oxide at the range between 200° and 300° C. are in the range between -0.05 and +0.10.
Claim 3
Dependent Claim
38 words
A sintered body of zirconium oxide material as set forth in claim 1, wherein said sintered body of zirconium oxide material contains 4 to 7 mol% of yttrium oxide as an additive for partially stabilizing the zirconium oxide.
Claim 4
Dependent Claim
27 words
A sintered body of zirconium oxide material as set forth in claim 1, wherein said sintered body of zirconium oxide material contains 10 mol% of calcium oxide.
Claim 5
Dependent Claim
32 words
A sintered body of zirconium oxide material as set forth in claim 1, wherein said sintered body of zirconium oxide material contains 3 mol% of yttrium oxide and 2 mol% of ytterbium.
Claim 6
Dependent Claim
31 words
A sintered body of zirconium oxide material as set forth in claim 1, wherein said sintered body of zirconium oxide contains 2 mol% of yttrium oxide and 3 mol% of ytterbium.
Claim 7
Dependent Claim
33 words
A sintered body of zirconium oxide material as set forth in claim 1, wherein said sintered body of zirconium oxide material contains 4 mol% of yttrium oxide and 3 mol% of calcium oxide.
References Cited (Backward Citations)
US3268349A
Cited
FR1474029A
Cited
US3432314A
Cited
US4067745A
Cited
US4125407A
Cited
US4152234A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-26 | 1984-02-25 | 1984-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-26 | 1988-02-25 | 1988-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-26 | 1992-02-25 | 1992-08-26 | $7700.00 | Window Closed / Lapsed |