US4804644A
Expired / Lapsed
US
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Ceramic material
Assignee: Vesuvius Holdings Ltd
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Filing: 1987-05-26
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Granted: 1989-02-14
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Expires: 2007-05-26
Abstract
Abstract A ceramic material which comprises a composite of zirconia and O'-sialon or silicon oxynitride. The ceramic material may comprise a dispersion of zirconia in an O'-sialon matrix and such a dispersion is obtained when the amount of zirconia is from 5 to 30 volume percent, preferably 15 to 25 volume percent, based on the total volume of the composition.
Inventors
- 👤 Michael R. Anseau
- 👤 James M. Lawson
- 👤 Shaun Slasor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:56
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B35/01; C04B35/48; C04B35/481; C04B35/597
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
32 words
A ceramic material which consists essentially of zirconia and O'-sialon, the zirconia being present in an amount of from 5 to 95 volume percent based on the total weight of the composition.
Claim 2
Dependent Claim
32 words
A ceramic material which consists essentially of zirconia and O'-sialon, the zirconia being present in an amount of from 5 to 95 volume percent based on the total weight of the composition.
Claim 3
Dependent Claim
18 words
Ceramic material according to claim 1 which consists essentially of a dispersion of zirconia in an O'-sialon matrix.
Claim 4
Dependent Claim
26 words
Ceramic material according to claim 2 which consists essentially of from 5 to 30 volume percent, of zirconia based on the total volume of the composition.
Claim 5
Dependent Claim
39 words
Ceramic material according to claim 1, wherein the composite includes therein a solid solution of zirconia with a compound selected from the group consisting of yttria, ceria, lanthanum oxide, calcium oxide, magnesium oxide and a rare earth metal oxide.
Claim 6
Dependent Claim
26 words
Ceramic material according to claim 3 which consists essentially of from 15 to 25 volume percent of zirconia based on the total volume of the composition.
References Cited (Backward Citations)
SU541823A1
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JPS5895654A
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US4426209A
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EP0124199A1
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JPS59232971A
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JPS6054977A
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GB2157282A
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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) | 1992-02-14 | 1992-08-15 | 1993-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-14 | 1996-08-15 | 1997-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-14 | 2000-08-15 | 2001-02-14 | $7700.00 | Window Closed / Lapsed |