Patent US5392490A successfully refreshed from Google Patents.
US4640336A
Expired / Lapsed
US
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Refractory for continuous casting
Assignee: Coorstek KK
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Filing: 1985-09-24
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Granted: 1987-02-03
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Expires: 2005-09-24
Abstract
Abstract A silicon aluminum oxynitride containing refractory for use in continuous casting is placed between a mold and a tundish and is formed by sintering an admixture of silicon nitride (Si3N4), aluminum nitride (AlN), boron nitride(BN), and a mineral clay. The refractory further includes aluminum oxide(Al2O3).
Inventors
- 👤 Kazumi Arakawa
- 👤 Toshiyuki Hirao
- 👤 Kenji Sugiura
- 👤 Satoshi Kuroki
- 👤 Sei Hiraki
- 👤 Takao Suzuki
- 👤 Ken Nakai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:30
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/04; B22D11/045; B22D11/047; B22D11/0475; C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/581; C04B35/584; C04B35/597
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
96 words
A refractory article for connecting a mold and a tundish in continuous casting, said refractory article containing silicon aluminum oxynitride produced by heating an admixture consisting essentially of: 1-80 wt. % aluminum nitride, 1-50 wt. % boron nitride, 1-30 wt. % clay mineral, and the remainder being silicon nitride, said clay mineral containing alumina, silica and an alkali component, whereby said silica and alumina react with said aluminum nitride and said silicon nitride to produce the silicon aluminum oxynitride and said alkali component reacts with said silicon nitride to produce a glass phase within the refractory.
Claim 2
Dependent Claim
96 words
A refractory article for connecting a mold and a tundish in continuous casting, said refractory article containing silicon aluminum oxynitride produced by heating an admixture consisting essentially of: 1-80 wt. % aluminum nitride, 1-50 wt. % boron nitride, 1-30 wt. % clay mineral, and the remainder being silicon nitride, said clay mineral containing alumina, silica and an alkali component, whereby said silica and alumina react with said aluminum nitride and said silicon nitride to produce the silicon aluminum oxynitride and said alkali component reacts with said silicon nitride to produce a glass phase within the refractory.
Claim 3
Dependent Claim
13 words
A refractory as claimed in claim 1 wherein the mineral clay is montmorillonite.
Claim 4
Dependent Claim
16 words
A refractory as claimed in claim 1, wherein the mineral clay is bentonite or acid clay.
Claim 5
Dependent Claim
13 words
A refractory as claimed in claim 1, wherein the mineral clay is illite.
Claim 6
Dependent Claim
16 words
A refractory as claimed in claim 1, wherein the mineral clay is sericite or white mica.
Claim 7
Dependent Claim
100 words
A refractory article for connecting a mold and a tundish in continuous casting, said refractory article containing silicon aluminum oxynitride produced by heating an admixture consisting essentially of: 1- 75wt. % silicon nitride, 1-30 wt. % aluminum nitride, 3-30 wt. % boron nitride, 5-30 wt. % clay mineral, and 2-50 wt. % alumina, said clay mineral containing alumina, silica and an alkali component, whereby said silica and alumina react with said aluminum nitride and said silicon nitride to produce the silicon aluminum oxynitride and said alkali component reacts with said silicon nitride to produce a glass phase within the refractory.
Claim 8
Dependent Claim
100 words
A refractory article for connecting a mold and a tundish in continuous casting, said refractory article containing silicon aluminum oxynitride produced by heating an admixture consisting essentially of: 1- 75wt. % silicon nitride, 1-30 wt. % aluminum nitride, 3-30 wt. % boron nitride, 5-30 wt. % clay mineral, and 2-50 wt. % alumina, said clay mineral containing alumina, silica and an alkali component, whereby said silica and alumina react with said aluminum nitride and said silicon nitride to produce the silicon aluminum oxynitride and said alkali component reacts with said silicon nitride to produce a glass phase within the refractory.
Claim 9
Dependent Claim
13 words
A refractory as claimed in claim 6, wherein the mineral clay is montmorillonite.
Claim 10
Dependent Claim
16 words
A refractory as claimed in claim 6, wherein the mineral clay is bentonite or acid clay.
Claim 11
Dependent Claim
13 words
A refractory as claimed in claim 6, wherein the mineral clay is illite.
Claim 12
Dependent Claim
16 words
A refractory as claimed in claim 6, wherein the mineral clay is sericite or white mica.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-02 | 1990-08-04 | 1991-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-02 | 1994-08-04 | 1995-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-02 | 1998-08-04 | 1999-02-03 | $7700.00 | Window Closed / Lapsed |