US4565792A
Expired / Lapsed
US
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Partially stabilized zirconia bodies
Assignee: Saint Gobain Abrasives Inc
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Filing: 1984-06-15
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Granted: 1986-01-21
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Expires: 2004-06-15
Abstract
Abstract Stabilized sintered zirconia bodies are made by employing zirconia powders made from rapidly quenched co-fusions of zirconia with a stabilizing metal oxide. Finer crystallinity and higher strength is achieved in the fired body.
Inventors
- 👤 Christopher E. Knapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:09
CPC Classifications
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
42 words
A crystalline sintered stabilized zirconia body made from a powder, said powder consisting essentially of a cofusion of zirconia and from 2.6% to 10% of a stabilizing metal oxide, the crystals in said body having a size of 10 microns or less.
Claim 2
Dependent Claim
42 words
A crystalline sintered stabilized zirconia body made from a powder, said powder consisting essentially of a cofusion of zirconia and from 2.6% to 10% of a stabilizing metal oxide, the crystals in said body having a size of 10 microns or less.
Claim 3
Dependent Claim
29 words
A stabilized zirconia body as in claim 1 in which the stabilizing agent selected from the group consisting of calcia, yttria, magnesia, stabiliziing rare earth oxides and mixtures thereof.
Claim 4
Dependent Claim
33 words
A powder for the production of sintered stabilized zirconia consisting essentially of from 2.6% zirconia co-fused with to 10% of one or more stabilizing agents, then rapidly quenched and milled to a powder.
Claim 5
Dependent Claim
33 words
A powder for the production of sintered stabilized zirconia consisting essentially of from 2.6% zirconia co-fused with to 10% of one or more stabilizing agents, then rapidly quenched and milled to a powder.
Claim 6
Dependent Claim
30 words
A powder as in claim 3 in which the stabilizing agent is selected from the group consisting of calcia, yttria, magnesia, and other rare earth stabilizing oxides, and mixtures thereof.
Claim 7
Dependent Claim
22 words
A powder as in claim 3 which has been chemically leached to reduce silica content, introduced with raw materials in the fusion.
Claim 8
Independent Claim
71 words
A method of forming stabilized sintered zirconia bodies consisting essentially of zirconia and from 2.6% to 10% of a stabilizing metal oxide comprising the steps of (1) reducing to powder form a rapidly quenched co-fusion of zirconia and a stabilizing agent, molding the powder to shape, firing said shape at 1350° C. to 1550° C. for a time sufficient to develop a strong sintered bond between the grains of the body.
Claim 9
Independent Claim
71 words
A method of forming stabilized sintered zirconia bodies consisting essentially of zirconia and from 2.6% to 10% of a stabilizing metal oxide comprising the steps of (1) reducing to powder form a rapidly quenched co-fusion of zirconia and a stabilizing agent, molding the powder to shape, firing said shape at 1350° C. to 1550° C. for a time sufficient to develop a strong sintered bond between the grains of the body.
Claim 10
Dependent Claim
37 words
A sintered stabilized zirconia body consisting essentially of zirconia and from 2.6% to 10% of a stabilizing metal oxide having stabilized zirconia particles of 10 microns or less and a bending strength of greater than 200,000 psi.
Claim 11
Dependent Claim
37 words
A sintered stabilized zirconia body consisting essentially of zirconia and from 2.6% to 10% of a stabilizing metal oxide having stabilized zirconia particles of 10 microns or less and a bending strength of greater than 200,000 psi.
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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) | 1989-01-20 | 1989-07-22 | 1990-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-20 | 1993-07-22 | 1994-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-20 | 1997-07-22 | 1998-01-21 | $7700.00 | Window Closed / Lapsed |