US4201594A
Expired / Lapsed
US
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Method for making refractory articles
Assignee: Zirconal Processes Ltd
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Filing: 1978-02-06
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Granted: 1980-05-06
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Expires: 1998-02-06
Abstract
Abstract The invention concerns the binding of refractory powders into self-supporting `green` shapes which are fired to provide refractory objects. In accordance with the invention the binders are based on zirconium salts and include a separate gell time delaying agent to ensure satisfactory gelling and to achieve control and to allow complex shapes to be made.
Inventors
- 👤 Ian R. Walters
- 👤 Harold G. Emblem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:06
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/6325; B; B22; B22C; B22C1/00; B22C1/16; C04B28/00; C04B35/6303
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
173 words
A method of making a refractory article comprising: (a) preparing a liquid, flowable slurry by combining a refractory powder, an aqueous solution of a zirconium salt which when dissolved in water yields an aqueous solution that is alkaline, a gellation-inducing agent, and a gellation-delaying agent; said gellation-inducing agent being selected from the group consisting of dead burned magnesium powder and powdered magnesia-containing spinel, and said gellation-delaying agent being selected from the group consisting of magnesium acetate, magnesium lactate, ammonium lactate, glycine, betaine, fructose, a polyhydric alcohol selected from the group glycerol, sorbitol and mannitol and the aminoalcohols; the amounts of refractory powder, solution of zirconium, salt, gellation-inducing agent and gellation-delaying agent being such that the slurry will set to a coherent state upon standing; (b) pouring the slurry while liquid into a mould; (c) allowing the slurry in the mould to set to form a coherent green shape; and, (d) removing the green shape from the mould, drying the green shape and firing the dried green shape to form a sintered refractory article.
Claim 2
Independent Claim
173 words
A method of making a refractory article comprising: (a) preparing a liquid, flowable slurry by combining a refractory powder, an aqueous solution of a zirconium salt which when dissolved in water yields an aqueous solution that is alkaline, a gellation-inducing agent, and a gellation-delaying agent; said gellation-inducing agent being selected from the group consisting of dead burned magnesium powder and powdered magnesia-containing spinel, and said gellation-delaying agent being selected from the group consisting of magnesium acetate, magnesium lactate, ammonium lactate, glycine, betaine, fructose, a polyhydric alcohol selected from the group glycerol, sorbitol and mannitol and the aminoalcohols; the amounts of refractory powder, solution of zirconium, salt, gellation-inducing agent and gellation-delaying agent being such that the slurry will set to a coherent state upon standing; (b) pouring the slurry while liquid into a mould; (c) allowing the slurry in the mould to set to form a coherent green shape; and, (d) removing the green shape from the mould, drying the green shape and firing the dried green shape to form a sintered refractory article.
Claim 3
Independent Claim
125 words
A method of making a refractory article comprising: (a) preparing a liquid flowable slurry by combining a refractory powder and dead burned magnesia powder, an aqueous alkaline solution of ammonium zirconium carbonate and a gellation delaying agent selected from the group consisting of sorbitol, fructose, glycine and aminoalcohols; the amounts of refractory powder, solution of zirconium, salt, dead burned magnesia and gellation-delaying agent being such that the slurry will set to a coherent state upon standing; (b) pouring the slurry while liquid into a mould; (c) allowing the slurry in the mould to set to form a coherent green shape; and, (d) removing the green shape from the mould, drying the green shape and firing the dried green shape to form a sintered refractory article.
Claim 4
Independent Claim
125 words
A method of making a refractory article comprising: (a) preparing a liquid flowable slurry by combining a refractory powder and dead burned magnesia powder, an aqueous alkaline solution of ammonium zirconium carbonate and a gellation delaying agent selected from the group consisting of sorbitol, fructose, glycine and aminoalcohols; the amounts of refractory powder, solution of zirconium, salt, dead burned magnesia and gellation-delaying agent being such that the slurry will set to a coherent state upon standing; (b) pouring the slurry while liquid into a mould; (c) allowing the slurry in the mould to set to form a coherent green shape; and, (d) removing the green shape from the mould, drying the green shape and firing the dried green shape to form a sintered refractory article.
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) | 1983-05-06 | 1983-11-05 | 1984-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-06 | 1987-11-05 | 1988-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-06 | 1991-11-05 | 1992-05-06 | $7700.00 | Window Closed / Lapsed |