Patent US4283035A successfully refreshed from Google Patents.
US4656145A
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Zirconia type black decorative article and process for production thereof
Assignee: Kyocera Corp
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Filing: 1983-12-23
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Granted: 1987-04-07
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Expires: 2003-12-23
Abstract
Abstract Disclosed is a process for the production of a zirconia type black decorative article which comprises sintering an unsintered molded body comprising a matrix composed mainly of zirconia and at least one stabilizer contained in the matrix, said stabilizer being selected from Y 2 O 3 , MgO, CeO 2 and CaO, at a temperature of 1400° to 1600° C. in a non-oxidizing atmosphere so that the molded body becomes black, and subjecting the sintered body to the mirror polishing treatment. The decorative article prepared according to this process has a black and glossy mirror surface and also has high flexural strength and high toughness.
Inventors
- 👤 Kazunori Soroi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:04
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/486; G; G04; G04B; G04B37/00; G04B37/22
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
123 words
A process for the production of a zirconia type black decorative article comprising: forming a molded body comprisng a matrix composed mainly of zirconia and at least one stabilizer selected from the group consisting of Y 2 O 3 , MgO, CeO 2 and CaO and further comprising a blackening component in an amount of from 0.001% to 1% by weight of said body selected from a group consisting of zirconium carbide, carbon or a reduction product of zirconia in an amount of 0.001% to 1% by weight; firing said molded body at a temperature of 1400° C. to 1600° C. in a non-oxidizing, atmosphere thereby forming a black sintered body; and polishing a surface of said sintered body to a mirror-like finish.
Claim 2
Dependent Claim
123 words
A process for the production of a zirconia type black decorative article comprising: forming a molded body comprisng a matrix composed mainly of zirconia and at least one stabilizer selected from the group consisting of Y 2 O 3 , MgO, CeO 2 and CaO and further comprising a blackening component in an amount of from 0.001% to 1% by weight of said body selected from a group consisting of zirconium carbide, carbon or a reduction product of zirconia in an amount of 0.001% to 1% by weight; firing said molded body at a temperature of 1400° C. to 1600° C. in a non-oxidizing, atmosphere thereby forming a black sintered body; and polishing a surface of said sintered body to a mirror-like finish.
Claim 3
Dependent Claim
16 words
A process according to claim 1, wherein the unsintered molded body is sintered in a vacuum.
Claim 4
Dependent Claim
126 words
A process for the production of a zirconia type black decorative article comprising: forming a molded body comprising a matrix composed mainly of zirconia and at least one stabilizer selected from the group consisting of Y 2 O 3 , MgO, CeO 2 and CaO; firing said molded body at a temperature of 1400° C. to 1600° C. in a non-oxidizing, carbon-containing atmosphere, thereby forming a black sintered body, wherein said molded body is fired such that a blackening component is formed in an amount of from 0.001% to 1% by weight of said body, said blackening component being selected from the group consisting of carbon, zirconium carbide or a reduction product of zirconia; and polishing a surface of said sintered body to a mirror-like finish.
Claim 5
Dependent Claim
126 words
A process for the production of a zirconia type black decorative article comprising: forming a molded body comprising a matrix composed mainly of zirconia and at least one stabilizer selected from the group consisting of Y 2 O 3 , MgO, CeO 2 and CaO; firing said molded body at a temperature of 1400° C. to 1600° C. in a non-oxidizing, carbon-containing atmosphere, thereby forming a black sintered body, wherein said molded body is fired such that a blackening component is formed in an amount of from 0.001% to 1% by weight of said body, said blackening component being selected from the group consisting of carbon, zirconium carbide or a reduction product of zirconia; and polishing a surface of said sintered body to a mirror-like finish.
Claim 6
Dependent Claim
12 words
A process according to claim 3, wherein the carbon is carbon black.
Claim 7
Dependent Claim
22 words
A process according to claim 3, wherein yttria is incorporated in an amount of 3 to 55 mole % based on zirconia.
Claim 8
Dependent Claim
21 words
A process according to claim 3, wherein calcia is added in amount of 8 to 29 mole % based on zirconia.
Claim 9
Dependent Claim
22 words
A process according to claim 3, wherein magnesia is incorporated in an amount of 16 to 26 mole % based on zirconia.
Claim 10
Dependent Claim
22 words
A process according to claim 3, wherein the particle size of either zirconia or the stabilizer is smaller than about 2.0 μm.
Claim 11
Dependent Claim
98 words
A zirconia type decorative article having a black glossy mirror surface with a high degree of smoothness formed by polishing, said article comprising a sintered body formed from a matrix composed mainly of zirconia and at least one stablizer contained in said matrix, said stabilizer being selected from a group consisting of Y 2 O 3 , MgO, CeO 2 and CaO, and further wherein said sintered body contains at least one blackening component selected from a group consisting of zirconium carbide, carbon or a reduction product of zirconia in an amount of 0.001% to 1% by weight.
Claim 12
Dependent Claim
98 words
A zirconia type decorative article having a black glossy mirror surface with a high degree of smoothness formed by polishing, said article comprising a sintered body formed from a matrix composed mainly of zirconia and at least one stablizer contained in said matrix, said stabilizer being selected from a group consisting of Y 2 O 3 , MgO, CeO 2 and CaO, and further wherein said sintered body contains at least one blackening component selected from a group consisting of zirconium carbide, carbon or a reduction product of zirconia in an amount of 0.001% to 1% by weight.
Claim 13
Dependent Claim
24 words
A decorative article as set forth in claim 9, wherein said sintered body has a flexural strength of at least 50 kg/mm 2 .
Claim 14
Dependent Claim
26 words
A zirconia type decorative article having a black glossy mirror surface with a high degree of smoothness prepared by the process set forth in claim 1.
Claim 15
Dependent Claim
26 words
A zirconia type decorative article having a black glossy mirror surface with a high degree of smoothness prepared by the process set forth in claim 3.
Claim 16
Dependent Claim
21 words
A process according to claim 1 wherein said molded body is sintered in an inert gas atmosphere comprising nitrogen or argon.
References Cited (Backward Citations)
US4430279A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-04-06 | 1990-10-06 | 1991-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-06 | 1994-10-06 | 1995-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-06 | 1998-10-06 | 1999-04-07 | $7700.00 | Window Closed / Lapsed |