US4829028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing an alumina-zirconia composite sintered material
Assignee: Japan Carlit Co Ltd
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Filing: 1987-12-22
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Granted: 1989-05-09
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Expires: 2007-12-22
Abstract
Abstract Alumina-zirconia composite sintered materials having sufficient high-temperature strength and thermal shock resistance as well as excellent mechanical strength are made by mixing Bayer alumina and/or bauxite as an alumina and baddeleyite and/or zircon sand as a zirconia material in amounts of 50 to 95% by weight of alumina, the balance being zirconia, respectively, subjecting the mixture to heating, melting and quenching, grinding the resulting solid to an average grain size of 10 mu m or smaller, and subjecting the resulting powder to molding and sintering.
Inventors
- 👤 Ichiro Seki
- 👤 Morinosuke Kano
- 👤 Akihiko Fujii
- 👤 Akihiro Kano
- 👤 Isao Isa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:06
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/653; C04B35/01; C04B35/10; C04B35/111; C04B35/117; C04B35/119
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
122 words
A process for producing an alumina-zirconia composite sintered material comprising mixing at least one member selected from the group consisting of Bayer alumina and bauxite as an alumina material and at least one member selected from the group consisting of baddeleyite and zircon sand as a zirconia material in amounts of 50 to 95% by weight of alumina, the balance being zirconia, respectively, subjecting the resulting mixture to heating, melting and quenching, thereafter grinding the mixture to a powder with an average grain size of 10 μm or smaller, and subjecting the powder to molding and sintering at a temperature of from 1200° to 1800° C. thereby to produce said composite with a SiO 2 content of 1.5% wt % or less.
Claim 2
Dependent Claim
122 words
A process for producing an alumina-zirconia composite sintered material comprising mixing at least one member selected from the group consisting of Bayer alumina and bauxite as an alumina material and at least one member selected from the group consisting of baddeleyite and zircon sand as a zirconia material in amounts of 50 to 95% by weight of alumina, the balance being zirconia, respectively, subjecting the resulting mixture to heating, melting and quenching, thereafter grinding the mixture to a powder with an average grain size of 10 μm or smaller, and subjecting the powder to molding and sintering at a temperature of from 1200° to 1800° C. thereby to produce said composite with a SiO 2 content of 1.5% wt % or less.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein the sintering is effected under atmospheric pressure.
Claim 4
Dependent Claim
24 words
The process of claim 1 wherein the grinding of the mixture is effected to produce an average grain size of 5 μm or smaller.
Claim 5
Dependent Claim
24 words
The process of claim 1 wherein the grinding of the mixture is effected to produce an average grain size of 1.5 μm or smaller.
Claim 6
Dependent Claim
21 words
The process of claim 1 wherein the grinding of the mixture is conducted by a wet method using a liquid medium.
Claim 7
Dependent Claim
11 words
The process of claim 5 wherein the liquid medium is water.
Claim 8
Dependent Claim
15 words
The process of claim 1 wherein the sintering temperature is from 1200° to 1600° C.
Claim 9
Dependent Claim
23 words
The process of claim 1 wherein the grinding of the mixture is effected to produce an average grain size of about 0.1 microns.
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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) | 1992-05-08 | 1992-11-07 | 1993-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-08 | 1996-11-07 | 1997-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-08 | 2000-11-07 | 2001-05-09 | $7700.00 | Window Closed / Lapsed |