Patent US4646950A successfully refreshed from Google Patents.
US4646950A
Expired / Lapsed
US
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Sliding nozzle plate
Assignee: Harima Refractories Co Ltd
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Filing: 1984-10-26
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Granted: 1987-03-03
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Expires: 2004-10-26
Abstract
Abstract A sliding nozzle plate enjoying outstanding stability to resist wear, spalling, corrosion, and particularly loss due to corrosion is produced by preparing a composition consisting of at least one refractory raw material selected from the group consisting of acidic and/or neutral refractory raw materials, carbon, metal powder, and 2 to 50% by weight, based on the total weight of the composition, of coarse and/or medium particles of an alumina-zirconia-titania mixture of 42 to 79.3% by weight of alumina, 20 to 40% by weight of zirconia, 0.5 to 16% by weight of titania, and the balance to make up 100% by weight and not more than 2% by weight of inevitably entrained elements. The composition is required to have a particle size distribution of 30 to 60% by weight of coarse and medium particles and the balance to make up 100% by weight of fine particles and/or fine powder. The composition is kneaded with a binder, molded in a prescribed shape, and subjected to firing in reducing atmosphere.
Inventors
- 👤 Michihiro Gotoh
- 👤 Tsuyoshi Fujimoto
- 👤 Nobiru Komatsu
- 👤 Yuzo Otsuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:25
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/101; C04B35/106; B; B22; B22D; B22D41/00; B22D41/14; B22D41/22; B22D41/28; B22D41/30; B22D41/32
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
149 words
A sliding nozzle plate produced by a process which comprises: (a) kneading a composition with a binder, (b) molding said kneaded composition into a body having a predetermined shape and (c) firing said body in a reducing atmosphere, said composition comprising at least one non-alkaline refractory material, carbon, metal powder and 2 to 50% by weight of a mixture of coarse, medium or both coarse and medium sized particles of alumina, zirconia and titania, said mixture comprising 42 to 79.3% by weight of alumina, 20 to 40% by weight of zirconia, 0.5 to 16% by weight of titania and up to a total of 2% by weight of SiO 2 , Fe 2 O 3 and Na 2 O, based on the total weight of said mixture, 30 to 60% of the total weight of said composition being of coarse and medium-sized particles, with the balance being fine powder.
Claim 2
Dependent Claim
149 words
A sliding nozzle plate produced by a process which comprises: (a) kneading a composition with a binder, (b) molding said kneaded composition into a body having a predetermined shape and (c) firing said body in a reducing atmosphere, said composition comprising at least one non-alkaline refractory material, carbon, metal powder and 2 to 50% by weight of a mixture of coarse, medium or both coarse and medium sized particles of alumina, zirconia and titania, said mixture comprising 42 to 79.3% by weight of alumina, 20 to 40% by weight of zirconia, 0.5 to 16% by weight of titania and up to a total of 2% by weight of SiO 2 , Fe 2 O 3 and Na 2 O, based on the total weight of said mixture, 30 to 60% of the total weight of said composition being of coarse and medium-sized particles, with the balance being fine powder.
Claim 3
Dependent Claim
33 words
The sliding nozzle plate according to claim 1 wherein said composition has a particle size distribution of 35 to 55% by weight of coarse and medium particles with the balance being fine powder.
Claim 4
Dependent Claim
20 words
The sliding nozzle plate according to claim 2 wherein said alumina-zirconia-titania mixture is present at 10 to 30% by weight.
Claim 5
Dependent Claim
20 words
The sliding nozzle plate accordng to claim 1 wherein said alumina-zirconia-titania mixture is present at 10 to 30% by weight.
Claim 6
Dependent Claim
189 words
A sliding nozzle plate produced by a process which comprises: (a) kneading said coposition with a binder, (b) molding said kneaded composition into a body having a predetermined shape and (c) firing said body in a reducing atmosphere, said composition comprising at least one non-alkaline refractory material, carbon, metal powder, at least one material selected from the group consisting of monoclinic zirconia having a particle size up to 20 microns, silicon carbide having a particle size up to 150 microns and silicon nitride having a particle size up to 150 microns, and 2 to 50% by weight of a mixture of coarse, medium or both coarse and medium particles of alumina, zirconia and titania, said mixture comprising 42 to 79.3% by weight of alumina, 20 to 40% by weight of zirconia, 0.5 to 16% by weight of titania and up to a total of 2% by weight of SiO 2 , Fe 2 O 3 and Na 2 O, based on the total weight of said mixture, 30 to 60% of the total weight of said composition being of coarse and medium-sized particles, with the balance being fine powder.
Claim 7
Dependent Claim
189 words
A sliding nozzle plate produced by a process which comprises: (a) kneading said coposition with a binder, (b) molding said kneaded composition into a body having a predetermined shape and (c) firing said body in a reducing atmosphere, said composition comprising at least one non-alkaline refractory material, carbon, metal powder, at least one material selected from the group consisting of monoclinic zirconia having a particle size up to 20 microns, silicon carbide having a particle size up to 150 microns and silicon nitride having a particle size up to 150 microns, and 2 to 50% by weight of a mixture of coarse, medium or both coarse and medium particles of alumina, zirconia and titania, said mixture comprising 42 to 79.3% by weight of alumina, 20 to 40% by weight of zirconia, 0.5 to 16% by weight of titania and up to a total of 2% by weight of SiO 2 , Fe 2 O 3 and Na 2 O, based on the total weight of said mixture, 30 to 60% of the total weight of said composition being of coarse and medium-sized particles, with the balance being fine powder.
Claim 8
Dependent Claim
33 words
The sliding nozzle plate according to claim 5 wherein said composition has a particle size distribution of 35 to 55% by weight of coarse and medium particles with the balance being fine powder.
Claim 9
Dependent Claim
20 words
The sliding nozzle plate according to claim 6 wherein said alumina-zirconia-titania mixture is present at 10 to 30% by weight.
Claim 10
Dependent Claim
20 words
The sliding nozzle plate according to claim 5 wherein said alumina-zirconia-titania mixture is present at 10 to 30% by weight.
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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) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |