US4244745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-strength refractory casting compound for the manufacture of monolithic linings
Assignee: SVENSKA HOGANAS AB
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Filing: 1979-05-31
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Granted: 1981-01-13
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Expires: 1999-05-31
Abstract
Abstract High-strength refractory casting compound for monolithic furnace linings, consisting of refractory, durable, granular filler, reactive alumina, high-grade calcium aluminate cement and silica sol as the only liquid to provide castability and ceramic bond. The addition of 6 to 10 parts by weight of a 40% silica sol, i.e. containing 3.6 to 6 parts by weight water, per 100 parts by weight dry material mixed as above is suitable, the reactive alumina constituting 5 to 15 parts by weight and the high-grade calcium aluminate cement constituting 1.5 to 5 parts by weight of said dry material.
Inventors
- 👤 Peter H. Havranek
- 👤 Lars O Thornblad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:40
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/6303; C04B35/6316; C04B35/66; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3217
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
86 words
A refractory casting compound having high strength and high resistance to wear at high temperatures comprising (a) 80-90 parts by weight of a granular refractory filler, (b) 10-20 parts by weight of a mixture consisting of 5-15 parts by weight of reactive alumina and 1.5-5 parts by weight of calcium aluminate cement for a total of 100 parts by weight of said filler and said mixture, and (c) 6-10 parts by weight of a silica sol which contains at least 30 percent by weight of silica.
Claim 2
Dependent Claim
86 words
A refractory casting compound having high strength and high resistance to wear at high temperatures comprising (a) 80-90 parts by weight of a granular refractory filler, (b) 10-20 parts by weight of a mixture consisting of 5-15 parts by weight of reactive alumina and 1.5-5 parts by weight of calcium aluminate cement for a total of 100 parts by weight of said filler and said mixture, and (c) 6-10 parts by weight of a silica sol which contains at least 30 percent by weight of silica.
Claim 3
Dependent Claim
19 words
The casting compound of claim 1 wherein said silica sol contains at least 40 percent by weight of silica.
Claim 4
Dependent Claim
49 words
The casting compound of claim 2 comprising about 50 parts by weight of calcined mullite, about 37.5 parts by weight of calcined alumina, about 10 parts by weight of reactive alumina, about 2.5 parts by weight of calcium aluminate cement, and about 9 parts by weight of silica sol.
Claim 5
Dependent Claim
41 words
The casting compound of claim 2 comprising about 87 parts by weight of molten alumina, about 10.5 parts by weight of reactive alumina, about 2.5 parts by weight of calcium aluminate cement, and about 6.5 parts by weight of silica sol.
Claim 6
Dependent Claim
19 words
The casting compound of claim 1 wherein the reactive alumina has a particle size of less than 100 mesh.
Claim 7
Dependent Claim
19 words
The casting compound of claim 5 wherein the reactive alumina has a particle size of less than 325 mesh.
Claim 8
Dependent Claim
18 words
The casting compound of claim 1 wherein said silica sol contains about 3.5-5 percent by weight of water.
Claim 9
Independent Claim
80 words
A method of preparing a refractory casting compound comprising admixing 80-90 parts by weight of a granular refractory filler and 10-20 parts by weight of a mixture consisting of 5-5 parts by weight of reactive alumina and 1.5-5 parts by weight of calcium aluminate cement to yield 100 parts by weight of said filler and said mixture, and thereafter adding to said admixture 6-10 parts by weight of silica sol containing at least about 30 percent by weight of silica.
Claim 10
Independent Claim
80 words
A method of preparing a refractory casting compound comprising admixing 80-90 parts by weight of a granular refractory filler and 10-20 parts by weight of a mixture consisting of 5-5 parts by weight of reactive alumina and 1.5-5 parts by weight of calcium aluminate cement to yield 100 parts by weight of said filler and said mixture, and thereafter adding to said admixture 6-10 parts by weight of silica sol containing at least about 30 percent by weight of silica.
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) | 1984-01-13 | 1984-07-14 | 1985-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-13 | 1988-07-14 | 1989-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-13 | 1992-07-14 | 1993-01-13 | $7700.00 | Window Closed / Lapsed |