US3892584A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monolithic refractory materials
Assignee: Nippon Crucible Co Ltd
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Filing: 1973-05-18
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Granted: 1975-07-01
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Expires: 1993-05-18
Abstract
Abstract Monolithic refractory materials comprising 55-75 percent by weight of alumina, 10-30 percent by weight of silicon carbide and 5-20 percent by weight of carbon. A chemical binder in an amount of 5-12 percent of the total combined weight of the mixtures of alumina, silicon carbide and carbon is present. The refractory materials have excellent erosion resistance against molten metals and slag.
Inventors
- 👤 Kenzo Takeda
- 👤 Kazuhiko Takahashi
- 👤 Kunihiko Shiraishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:11
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
83 words
REFRACTORY MATERIALS FOR RAMMING AND SOLID CASTING CONSISTING ESSENTIALLY OF 55-75 PERCENT OF AN ALUMINA MATERIAL, 10-30 PERCENT OF SILICON CARBIDE AND 5-20 PERCENT OF CARBON, BASED ON THE TOTAL 100 WT PERCENT, AND 5-12 PERCENT, BASED ON THE TOTAL WEIGHT OF SAID ALUMINA MATERIAL SILICON CARBIDE AND CARBON, OF A CHEMICAL BINDER OF A SOL HAVING A SOLIDS CONTENT OF MORE THAN 5 PERCENT BY WEIGHT SELECTED FROM THE GROUP CONSISTING OF A SILICA SOL, AN ALUMINA SOL AND A MULLITE SOL.
Claim 2
Dependent Claim
83 words
REFRACTORY MATERIALS FOR RAMMING AND SOLID CASTING CONSISTING ESSENTIALLY OF 55-75 PERCENT OF AN ALUMINA MATERIAL, 10-30 PERCENT OF SILICON CARBIDE AND 5-20 PERCENT OF CARBON, BASED ON THE TOTAL 100 WT PERCENT, AND 5-12 PERCENT, BASED ON THE TOTAL WEIGHT OF SAID ALUMINA MATERIAL SILICON CARBIDE AND CARBON, OF A CHEMICAL BINDER OF A SOL HAVING A SOLIDS CONTENT OF MORE THAN 5 PERCENT BY WEIGHT SELECTED FROM THE GROUP CONSISTING OF A SILICA SOL, AN ALUMINA SOL AND A MULLITE SOL.
Claim 3
Dependent Claim
27 words
Refractory materials as claimed in claim 1 wherein said alumina material is a fused or sintered alumina having a 94 percent by weight or greater alumina content.
Claim 4
Dependent Claim
28 words
Refractory materials as claimed in claim 1 wherein 75 wt percent or more of said alumina material is particles having a particle size of 1.5 mm or greater.
Claim 5
Dependent Claim
44 words
Refractory materials as claimed in claim 1 wherein said silicon carbide is particles having a particle size of 3.4 mm or less and 60 percent by weight or more of said silicon carbide is particles having a particle size of 0.15 mm or less.
Claim 6
Dependent Claim
17 words
Refractory materials as claimed in claim 1 wherein said carbon consists of natural graphite and/or amorphous carbon.
Claim 7
Dependent Claim
20 words
Refractory materials as claimed in claim 5 wherein the natural graphite has an ash content of 25 percent or less.
Claim 8
Dependent Claim
23 words
Refractory materials as claimed in claim 6 wherein said natural graphite is particles and has a particle size of 0.3 mm or less.
Claim 9
Dependent Claim
23 words
Refractory materials as claimed in claim 5 wherein said amorphous carbon is particles and has a particle size of 0.5 mm or less.
Claim 10
Dependent Claim
114 words
A process for casting a refractory material usable for ramming and solid casting, which comprises casting a thixotropic composition of a refractory material consisting essentially of: 55-75 percent of an alumina material; 10-30 percent of silicon carbide and 5-20 percent of carbon based on the total 100 wt percent, and 5-12 percent based on the total weight of said alumina material, silicon carbide and carbon, of a chemical binder of a sol having a solids content of more than 5 percent by weight selected from the group consisting of a silica sol, an alumina sol and a mullite sol, while applying vibrations thereto, whereby said composition, which is thixotropic, softens and becomes more fluid.
Claim 11
Dependent Claim
114 words
A process for casting a refractory material usable for ramming and solid casting, which comprises casting a thixotropic composition of a refractory material consisting essentially of: 55-75 percent of an alumina material; 10-30 percent of silicon carbide and 5-20 percent of carbon based on the total 100 wt percent, and 5-12 percent based on the total weight of said alumina material, silicon carbide and carbon, of a chemical binder of a sol having a solids content of more than 5 percent by weight selected from the group consisting of a silica sol, an alumina sol and a mullite sol, while applying vibrations thereto, whereby said composition, which is thixotropic, softens and becomes more fluid.
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) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |