US4748138A
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Highly toughened, sintered mass of zirconia
Assignee: Niterra Co Ltd
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Filing: 1984-07-16
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Granted: 1988-05-31
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Expires: 2004-07-16
Abstract
Abstract Ceramic sintered mass having a mean grain size of no more than 3 microns of high toughness even at high temperatures is obtainable, the mass comprising 30-99.5% by weight of a component A as defined below and the balance being a component B as defined below: Component A: zirconia having a tetragonal and/or cubic system content of no less than 90% by weight, with the proviso that the tetragonal/cubic system ratio by weight is no less than 0.25, said zirconia including a stabilizer of Y 2 O 3 , CaO, MgO, etc. Component B: one or more of borides, carbides and nitrides of Al, Si and an element in the groups 4a, 5a and 6a of the periodic table, and Al 2 O 3 . The balance may incorporate a further component C, such as SiO 2 , Fe 2 O 3 and TiO 2 and the like of no more than 3% by weight in the sintered mass.
Inventors
- 👤 Masakazu Watanabe
- 👤 Satoshi Iio
- 👤 Yasushi Matsuo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:48
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/486; C04B35/488; C04B35/10; C04B35/111; C04B35/117; C04B35/119; C04B35/4885
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
145 words
A ceramic press-sintered mass of high toughness consisting essentially of 30-99.5% by weight of a component A as defined below and the balance being a component B as defined below, and having a mean grain size of no more than 3 microns as a whole: Component A: zirconia having a tetragonal and/or cubic system content of no less than 90% by weight, with the proviso that the tetragonal/cubic system ratio by weight is no less than 0.25, said zirconia including a stabilizer consisting of one or more selected from the group consisting of Y 2 O 3 , CaO, MgO, Yb 2 O 3 and CeO; and Component B: one, or a mixture of two or more substances selected from the group consisting of borides, carbides and nitrides of Al, Si and an element in the groups 4a, 5a and 6a of the periodic table.
Claim 2
Dependent Claim
145 words
A ceramic press-sintered mass of high toughness consisting essentially of 30-99.5% by weight of a component A as defined below and the balance being a component B as defined below, and having a mean grain size of no more than 3 microns as a whole: Component A: zirconia having a tetragonal and/or cubic system content of no less than 90% by weight, with the proviso that the tetragonal/cubic system ratio by weight is no less than 0.25, said zirconia including a stabilizer consisting of one or more selected from the group consisting of Y 2 O 3 , CaO, MgO, Yb 2 O 3 and CeO; and Component B: one, or a mixture of two or more substances selected from the group consisting of borides, carbides and nitrides of Al, Si and an element in the groups 4a, 5a and 6a of the periodic table.
Claim 3
Dependent Claim
29 words
A ceramic press-sintered mass as defined in claim 1, in which the ceramic press-sintered mass was press-sintered at 1300°-1600° C. under a pressure of 50 kg/cm 2 or higher.
Claim 4
Dependent Claim
44 words
A ceramic press-sintered mass as defined in claim 1, in which as the component A, use is made of a material obtained by uniformly mixing water-soluble salts of zirconium and the stabilizer in a given proportion in an aqueous solution, followed by co-precipitation therefrom.
Claim 5
Dependent Claim
22 words
A ceramic press-sintered mass as defined in claim 1, in which ZrO 2 is partly or wholly replaced with HfO 2 .
Claim 6
Dependent Claim
43 words
A ceramic press-sintered mass as defined in claim 1, in which the component B is one, or a mixture of two or more substances selected from the group consisting of TiC, NbC, TiB 2 , TiN, SiC, Si 3 N 4 and WC.
Claim 7
Dependent Claim
39 words
A ceramic press-sintered mass as defined in claim 5, in which the component B is one, or a mixture of two or more substances selected from the group consisting of TiC, TiN, SiC and Si 3 N 4 .
Claim 8
Dependent Claim
39 words
A ceramic press-sintered mass as defined in claim 1, in which the component A includes 2 to 14 mol. % of the stabilizer, the mol. % being based on YO 1 .5, CaO, MgO, YbO 1 .5 and CeO.
Claim 9
Dependent Claim
30 words
A ceramic press-sintered mass as defined in claim 7, in which the stabilizer for the component A is one or more of Y 2 O 3 , CaO and MgO.
Claim 10
Dependent Claim
193 words
A ceramic press-sintered mass of high toughness consisting essentially of 30-99.5% by weight of a component A as defined below and the balance being components B and C as defined below, and having means grain size of no more than 3 microns as a whole: Component A: zirconia having a tetragonal and/or cubic system content of no less than 90% by weight, with the proviso that the tetragonal/cubic system ratio by weight is no less than 0.25, said zirconia including a stabilizer consisting of one or more selected from the group consisting of Y 2 O 3 , CaO, MgO, Yb 2 O 3 and CeO; Component B: one, or a mixture of two or more substances selected from the group consisting of borides, carbides and nitrides of Al, Si, and an element in the groups 4a, 5a and 6a of the periodic table; and Component C: 3% by weight or less of SiO 2 , 0.5% by weight or less of Fe 2 O 3 and/or 0.5% by weight or less of TiO 2 , provided that the component C amounts to no more than 3% by weight in said sintered mass.
Claim 11
Dependent Claim
193 words
A ceramic press-sintered mass of high toughness consisting essentially of 30-99.5% by weight of a component A as defined below and the balance being components B and C as defined below, and having means grain size of no more than 3 microns as a whole: Component A: zirconia having a tetragonal and/or cubic system content of no less than 90% by weight, with the proviso that the tetragonal/cubic system ratio by weight is no less than 0.25, said zirconia including a stabilizer consisting of one or more selected from the group consisting of Y 2 O 3 , CaO, MgO, Yb 2 O 3 and CeO; Component B: one, or a mixture of two or more substances selected from the group consisting of borides, carbides and nitrides of Al, Si, and an element in the groups 4a, 5a and 6a of the periodic table; and Component C: 3% by weight or less of SiO 2 , 0.5% by weight or less of Fe 2 O 3 and/or 0.5% by weight or less of TiO 2 , provided that the component C amounts to no more than 3% by weight in said sintered mass.
Claim 12
Dependent Claim
29 words
A ceramic press-sintered mass as defined in claim 9, in which the ceramic press-sintered mass was press-sintered at 1300°-1600° C. under a pressure of 50 kg/cm 2 or higher.
Claim 13
Dependent Claim
44 words
A ceramic press-sintered mass as defined in claim 9, in which as the component A, use is made of a material obtained by uniformly mixing water-soluble salts of zirconium and the stabilizer in a given proportion in an aqueous solution, followed by co-precipitation therefrom.
Claim 14
Dependent Claim
22 words
A ceramic press-sintered mass as defined in claim 9, in which ZrO 2 is partly or wholly replaced with HfO 2 .
Claim 15
Dependent Claim
43 words
A ceramic press-sintered mass as defined in claim 9, in which the component B is one, or a mixture of two or more substances selected from the group consisting of TiC, NbC, TiB 2 , TiN, SiC, Si 3 N 4 and WC.
Claim 16
Dependent Claim
39 words
A ceramic press-sintered mass as defined in claim 13, in which the component B is one, or a mixture of two or more substances selected from the group consisting of TiC, TiN, SiC and Si 3 N 4 .
Claim 17
Dependent Claim
39 words
A ceramic press-sintered mass as defined in claim 9 in which the A component includes 2 to 14 mol. % of the stabilizer, the mol. % being based on YO 1 .5, CaO, MgO, YbO 1 .5 and CeO.
Claim 18
Dependent Claim
33 words
A ceramic press-sintered mass of high toughness as defined in claim 15, in which the stabilizer for the component A is one or more of Y 2 O 3 , CaO and MgO.
Claim 19
Dependent Claim
175 words
A ceramic press-sintered mass of high toughness consisting essentially of 30-95% by weight of a component A as defined below and the balance being a component B as defined below, and having a mean grain size of no more than 3 microns as a whole: Component A: zirconia having a tetragonal and/or cubic system content of no less than 90% by weight, with the proviso that the tetragonal/cubic system ratio by weight is no less than 0.25, said zirconia including a stabilizer consisting of one or more selected from the group consisting of Y 2 O 3 , CaO, MgO, Yb 2 O 3 and CeO; and Component B: a mixture of Al 2 O 3 and at least one substance selected from the group consisting of borides, carbides and nitrides of Al, Si and an element in the groups 4a, 5a and 6a of the periodic table, wherein said substance is present 4% by weight or more and Al 2 O 3 is present 0.1% by weight or more respectively, of the whole components.
Claim 20
Dependent Claim
175 words
A ceramic press-sintered mass of high toughness consisting essentially of 30-95% by weight of a component A as defined below and the balance being a component B as defined below, and having a mean grain size of no more than 3 microns as a whole: Component A: zirconia having a tetragonal and/or cubic system content of no less than 90% by weight, with the proviso that the tetragonal/cubic system ratio by weight is no less than 0.25, said zirconia including a stabilizer consisting of one or more selected from the group consisting of Y 2 O 3 , CaO, MgO, Yb 2 O 3 and CeO; and Component B: a mixture of Al 2 O 3 and at least one substance selected from the group consisting of borides, carbides and nitrides of Al, Si and an element in the groups 4a, 5a and 6a of the periodic table, wherein said substance is present 4% by weight or more and Al 2 O 3 is present 0.1% by weight or more respectively, of the whole components.
Claim 21
Dependent Claim
29 words
A ceramic press-sintered mass as defined in claim 17, in which the ceramic press-sintered mass was press-sintered at 1300°-1600° C. under a pressure of 50 kg/cm 2 or higher.
Claim 22
Dependent Claim
44 words
A ceramic press-sinered mass as defined in claim 17, in which as the component A, use is made of a material obtained by uniformly mixing water-soluble salts of zirconium and the stabilizer in a given proportion in an aqueous solution, followed by co-precipitation therefrom.
Claim 23
Dependent Claim
22 words
A ceramic press-sintered mass as defined in claim 17, in which ZrO 2 is partly or wholly replaced with HfO 2 .
Claim 24
Dependent Claim
46 words
A ceramic press-sintered mass as defined in claim 17, in which the component B is a mixture of Al 2 O 3 and at least one substance selected from the group consisting of TiC, NbC, TiB 2 , TiN, SiC, Si 3 N 4 and WC.
Claim 25
Dependent Claim
35 words
A ceramic press-sintered mass as defined in claim 21, in which said substance of component B is at least one selected from the group consisting of TiC, TiN, SiC and Si 3 N 4 .
Claim 26
Dependent Claim
39 words
A ceramic press-sintered mass as defined in claim 17 in which the component A includes 2 to 14 mol. % of the stabilizer, the mol. % being based on YO 1 .5, CaO, MgO, YbO 1 .5 and CeO.
Claim 27
Dependent Claim
30 words
A ceramic press-sintered mass as defined in claim 23, in which the stabilizer for the component A is one or more of Y 2 O 3 , CaO and MgO.
Claim 28
Dependent Claim
223 words
A ceramic press-sintered mass of high toughness consisting essentially of 30-95% by weight of a component A as defined below and the balance being components B and C as defined below, and having mean grain size of no more than 3 microns as a whole: Component A: zirconia having a tetragonal and/or cubic system content of no less than 90% by weight, with the provisio that the tetragonal/cubic system ratio by weight is no less than 0.25, said zirconia including a stabilizer consisting of one or more selected from the group consisting of Y 2 O 3 , CaO, MgO, Yb 2 O 3 and CeO; Component B: a mixture of Al 2 O 3 and at least one substance selected from the group consisting of borides, carbides and nitrides of Al, Si and an element in the groups 4a, 5a and 6a of the periodic table, wherein said substance is present 4% by weight or more and Al 2 O 3 is present 0.1% by weight or more, respectively, of the whole components; and Component C: 3% by weight or less of SiO 2 , 0.5% by weight or less of Fe 2 O 3 and/or 0.5% by weight or less of TiO 2 , provided that the component C amounts to no more than 3% by weight in said sintered mass.
Claim 29
Dependent Claim
223 words
A ceramic press-sintered mass of high toughness consisting essentially of 30-95% by weight of a component A as defined below and the balance being components B and C as defined below, and having mean grain size of no more than 3 microns as a whole: Component A: zirconia having a tetragonal and/or cubic system content of no less than 90% by weight, with the provisio that the tetragonal/cubic system ratio by weight is no less than 0.25, said zirconia including a stabilizer consisting of one or more selected from the group consisting of Y 2 O 3 , CaO, MgO, Yb 2 O 3 and CeO; Component B: a mixture of Al 2 O 3 and at least one substance selected from the group consisting of borides, carbides and nitrides of Al, Si and an element in the groups 4a, 5a and 6a of the periodic table, wherein said substance is present 4% by weight or more and Al 2 O 3 is present 0.1% by weight or more, respectively, of the whole components; and Component C: 3% by weight or less of SiO 2 , 0.5% by weight or less of Fe 2 O 3 and/or 0.5% by weight or less of TiO 2 , provided that the component C amounts to no more than 3% by weight in said sintered mass.
Claim 30
Dependent Claim
29 words
A ceramic press-sintered mass as defined in claim 25, in which the ceramic press-sintered mass was press-sintered at 1300°-1600° C. under a pressure of 50 kg/cm 2 or higher.
Claim 31
Dependent Claim
44 words
A ceramic press-sintered mass as defined in claim 25, in which as the component A, use is made of a material obtained by uniformly mixing water-soluble salts of zirconium and the stabilizer in a given proportion in an aqueous solution, followed by co-precipitation therefrom.
Claim 32
Dependent Claim
22 words
A ceramic press-sintered mass as defined in claim 25, in which ZrO 2 is partly or wholly replaced with HfO 2 .
Claim 33
Dependent Claim
46 words
A ceramic press-sintered mass as defined in claim 25, in which the component B is a mixture of Al 2 O 3 and at least one substance selected from the group consisting of TiC, NbC, TiB 2 , TiN, SiC, Si 3 N 4 and WC.
Claim 34
Dependent Claim
36 words
A ceramic press-sintered mass as defined in claim 29, in which said substance of the component B is at least one selected from the group consisting of TiC, TiN, SiC and Si 3 N 4 .
Claim 35
Dependent Claim
39 words
A ceramic press-sintered mass as defined in claim 25 in which the A component includes 2 to 14 mol. % of the stabilizer, the mol. % being based on YO 1 .5, CaO, MgO, YbO 1 .5 and CeO.
Claim 36
Dependent Claim
33 words
A ceramic press-sintered mass of high toughness as defined in claim 31, in which the stabilizer for the component A is one or more of Y 2 O 3 , CaO and MgO.
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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) | 1991-05-31 | 1991-11-30 | 1992-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-31 | 1995-11-30 | 1996-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-31 | 1999-11-30 | 2000-05-31 | $7700.00 | Window Closed / Lapsed |