Patent US4610967A successfully refreshed from Google Patents.
US4610967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zirconia porcelain and method of manufacturing the same
Assignee: NGK Insulators Ltd
•
Filing: 1984-09-06
•
Granted: 1986-09-09
•
Expires: 2004-09-06
Abstract
Abstract Disclosed herein is a zirconia porcelain which includes 1.5-5 mol % of yttrium oxide, 1-5.5 mol % of cerium oxide and the balance being substantially zirconium oxide. Disclosed herein also is a method of producing a zirconia porcelain, which includes the steps of preparing a mixed powder including 1.5-5 mol % of yttrium oxide, 1-5.5 mol % of cerium oxide and the balance being substantially zirconium oxide having an average particle size of less than 1.5 mu m when measured according to an air permeation method, shaping the mixed powder into a molding, and firing the molding thus at a temperature of 1,100 DEG C.-1,700 DEG C.
Inventors
- 👤 Yuichiro Imanishi
- 👤 Minoru Matsui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:58
CPC Classifications
H; H01; H01M; H01M8/00; H01M8/10; H01M8/12; H01M8/124; H01M8/1246; H01M8/1253; C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/486; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
27 words
A zirconia porcelain ceramic body consisting essentially of 97.5-89.5 mol % of zirconia oxide, 1.5-5 mol % of yttrium oxide and 1-5.5 mol % of cerium oxide.
Claim 2
Dependent Claim
27 words
A zirconia porcelain ceramic body consisting essentially of 97.5-89.5 mol % of zirconia oxide, 1.5-5 mol % of yttrium oxide and 1-5.5 mol % of cerium oxide.
Claim 3
Dependent Claim
23 words
A zirconia porcelain according to claim 1, wherein said yttrium oxide is 2-3 mol % and said cerium oxide is 2-4 mol %.
Claim 4
Dependent Claim
22 words
A zirconia porcelain according to claim 1, wherein the zirconium oxide has an average particle size of not greater than 10 μm.
Claim 5
Dependent Claim
22 words
A zirconia porcelain according to claim 3, wherein the average particle size of the zirconium oxide is not greater than 2 μm.
Claim 6
Dependent Claim
33 words
A zirconia porcelain according to claim 1, wherein a total volume fraction of tetragonal zirconium oxide and cubic zirconium oxide is not less than 3 times the volume fraction of monoclinic zirconium oxide.
Claim 7
Dependent Claim
33 words
A zirconia porcelain according to claim 3, wherein a total volume fraction of tetragonal zirconium oxide and cubic zirconium oxide is not less than 3 times the volume fraction of monoclinic zirconium oxide.
Claim 8
Dependent Claim
33 words
A zirconia porcelain according to claim 4, wherein a total volume fraction of tetragonal zirconium oxide and cubic zirconium oxide is not less than 3 times the volume fraction of monoclinic zirconium oxide.
Claim 9
Dependent Claim
30 words
A zirconia porcelain according to claim 1, wherein a volume fraction of cubic zirconium oxide is less than the total volume fraction of tetragonal zirconium oxide and monoclinic zirconium oxide.
Claim 10
Dependent Claim
30 words
A zirconia porcelain according to claim 3, wherein a volume fraction of cubic zirconium oxide is less than the total volume fraction of tetragonal zirconium oxide and monoclinic zirconium oxide.
Claim 11
Dependent Claim
30 words
A zirconia porcelain according to claim 4, wherein a volume fraction of cubic zirconium oxide is less than the total volume fraction of tetragonal zirconium oxide and monoclinic zirconium oxide.
Claim 12
Dependent Claim
30 words
A zirconia porcelain according to claim 5, wherein a volume fraction of cubic zirconium oxide is less than the total volume fraction of tetragonal zirconium oxide and monoclinic zirconium oxide.
Claim 13
Dependent Claim
30 words
A zirconia porcelain according to claim 6, wherein a volume fraction of cubic zirconium oxide is less than the total volume fraction of tetragonal zirconium oxide and monoclinic zirconium oxide.
Claim 14
Dependent Claim
30 words
A zirconia porcelain according to claim 7, wherein a volume fraction of cubic zirconium oxide is less than the total volume fraction of tetragonal zirconium oxide and monoclinic zirconium oxide.
Claim 15
Independent Claim
74 words
A method of producing a zirconia porcelain ceramic body, comprising the steps of preparing a mixed powder consisting essentially of 1.5-5 mol % of yttrium oxide, 1-5.5mol % of cerium oxide and 97.5-89.5 mol % zirconium oxide, said zirconium oxide having an average particle size of less than 1.5 μm when measured according to an air permeation method, shaping the mixed powder into a desired molding, and firing the molding at 1,100° C.-1,700° C.
Claim 16
Independent Claim
74 words
A method of producing a zirconia porcelain ceramic body, comprising the steps of preparing a mixed powder consisting essentially of 1.5-5 mol % of yttrium oxide, 1-5.5mol % of cerium oxide and 97.5-89.5 mol % zirconium oxide, said zirconium oxide having an average particle size of less than 1.5 μm when measured according to an air permeation method, shaping the mixed powder into a desired molding, and firing the molding at 1,100° C.-1,700° C.
Claim 17
Dependent Claim
22 words
A method according to claim 14, wherein the yttrium oxide is 2-3 mol %, and the cerium oxide is 2-4 mol %.
Claim 18
Dependent Claim
18 words
A method according to claim 14, wherein the molding is fied at a temperature of 1,200° C.-1,500° C.
Claim 19
Dependent Claim
31 words
A method according to claim 14, wherein a powder obtained by finely crushing oxides of zirconium, yttrium, and cerium or pyrolyzed products of these compounds are used as the mixed powder.
Claim 20
Dependent Claim
31 words
A method according to claim 16, wherein a powder obtained by finely crushing oxides of zirconium, yttrium, and cerium or pyrolyzed products of these compounds are used as the mixed powder.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-08 | 1990-03-10 | 1990-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-08 | 1994-03-10 | 1994-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-08 | 1998-03-10 | 1998-09-09 | $7700.00 | Window Closed / Lapsed |