US4851293A
Expired / Lapsed
US
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Stabilized metallic oxides
Assignee: Tioxide Group Ltd
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Filing: 1988-04-22
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Granted: 1989-07-25
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Expires: 2008-04-22
Abstract
Abstract The stabilization of zirconia when used as a ceramic by various stabilizers has been known but a new and improved stabilized particulate zirconia has now been developed showing the important advantages. The particulate zirconia now developed is coated with a hydrous oxide of titanium and/or of aluminium and with at least one hydrous oxide of yttrium, calcium, magnesium, strontium or cerium.
Inventors
- 👤 Terence A. Egerton
- 👤 Kevin A. Fothergill
- 👤 Graham P. Dransfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:50
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/628; C04B35/62802; C04B35/62805; C04B35/62818; C04B35/62821; C01; C01G; C01G25/00; C01G25/02; C04B35/01; C04B35/48; C04B35/486; C04B35/6281; C04B35/62813; C04B35/62815; C04B35/62886; C04B35/62894; C01P; C01P2004/00; C01P2004/60; C01P2004/62; C01P2004/80; C01P2004/82; C01P2004/84; C01P2006/00; C01P2006/80; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3205; C04B2235/3206; C04B2235/3208; C04B2235/3213; C04B2235/3217; C04B2235/3224; C04B2235/3225; C04B2235/3229; C04B2235/3231; C04B2235/3232; C04B2235/3244; C04B2235/50; C04B2235/54; C04B2235/5418; C04B2235/5445; C04B2235/70; C04B2235/72; C04B2235/74; C04B2235/76; C04B2235/765; C04B2235/77; C04B2235/78; C04B2235/786; C04B2235/96; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
45 words
A composition suitable for use in the manufacture of a ceramic material which comprises particulate zirconia coated with a hydrous oxide of titanium and/or aluminium and with at least one other hydrous oxide selected from the group consisting of yttrium, calcium, magnesium, strontium and cerium.
Claim 2
Dependent Claim
45 words
A composition suitable for use in the manufacture of a ceramic material which comprises particulate zirconia coated with a hydrous oxide of titanium and/or aluminium and with at least one other hydrous oxide selected from the group consisting of yttrium, calcium, magnesium, strontium and cerium.
Claim 3
Dependent Claim
36 words
A composition according to claim 1 in which the hydrous oxide of titanium and/or aluminium is present as a discrete inner coating layer surrounded by an outer layer of the at least one other hydrous oxide.
Claim 4
Dependent Claim
32 words
A composition according to claim 1 in which the particulate zirconia is coated with a layer of mixed hydrous oxides of titanium and/or aluminium and the at least one other hydrous oxide.
Claim 5
Dependent Claim
32 words
A composition according to claim 1 in which said particulate zirconia has a size such that the majority of the particles have a diameter of less than or equal to 0.5 micron.
Claim 6
Dependent Claim
36 words
A composition according to claim 1 in which a hydrous oxide of yttrium is present in an amount of from 1.00 to 7.00 mole percent expressed as Y 2 O 3 based on moles of zirconia.
Claim 7
Dependent Claim
35 words
A composition according to claim 1 in which a hydrous oxide of calcium, magnesium or strontium is present in an amount of from 4 to 14 mole percent as oxide based on moles of zirconia.
Claim 8
Dependent Claim
32 words
A composition according to claim 1 in which a hydrous oxide of cerium is present in an amount of from 2 to 18 mole percent CeO 2 based on moles of zirconia.
Claim 9
Dependent Claim
34 words
A composition according to claim 1 in which a hydrous oxide of yttrium is present in an amount of from 5 to 10 mole percent Y 2 O 3 based on moles of zirconia.
Claim 10
Dependent Claim
35 words
A composition according to claim 1 in which a hydrous oxide of calcium, magnesium or strontium is present in an amount of from 8 to 25 mole percent as oxide based on moles of zirconia.
Claim 11
Dependent Claim
31 words
A composition according to claim 1 in which a hydrous oxide of cerium is present in an amount greater than 18 mole percent as CeO 2 based on moles of zirconia.
Claim 12
Dependent Claim
44 words
A composition according to claim 1 in which a hydrous oxide of titanium and/or a hydrous oxide of aluminium is present in an amount of from 0.2 to 15 mole percent as TiO 2 and/or A1 2 O 3 based on moles of zirconia.
Claim 13
Independent Claim
90 words
A method for the manufacture of a composition suitable for use in the manufacture of a ceramic material which comprises mixing particulate zirconia in the form of an aqueous dispersion with a water soluble hydrolysable salt of titanium and/or aluminium and precipitating a hydrous oxide of titanium and/or aluminium on said particles and mixing also therewith at least one other water-soluble hydrolysable salt selected from the group consisting of water-soluble hydrolysable salts of yttrium, calcium, magnesium, strontium and cerium and precipitating a hydrous oxide thereof on said particles of zirconia.
Claim 14
Independent Claim
90 words
A method for the manufacture of a composition suitable for use in the manufacture of a ceramic material which comprises mixing particulate zirconia in the form of an aqueous dispersion with a water soluble hydrolysable salt of titanium and/or aluminium and precipitating a hydrous oxide of titanium and/or aluminium on said particles and mixing also therewith at least one other water-soluble hydrolysable salt selected from the group consisting of water-soluble hydrolysable salts of yttrium, calcium, magnesium, strontium and cerium and precipitating a hydrous oxide thereof on said particles of zirconia.
Claim 15
Dependent Claim
49 words
A method according to claim 12 in which the hydrolysable salt of titanium and/or aluminium is mixed with the aqueous dispersion of zirconia and a hydrous oxide of titanium and/or aluminium precipitated on said particulate zirconia prior to the addition of the at least one other water-soluble hydrolysable salt.
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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) | 1992-07-24 | 1993-01-23 | 1993-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-24 | 1997-01-23 | 1997-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-24 | 2001-01-23 | 2001-07-25 | $7700.00 | Window Closed / Lapsed |