Claims
- 1. 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.
- 2. 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.
Parent Case Info
This application is a continuation in part of Ser. No. 748,702, filed Dec. 8, 1976, now abandoned, which in turn is a divisional application of Ser. No. 561,347, filed Mar. 24, 1975 (now U.S. Pat. No. 4,025,350), the benefits of the filing dates of which are hereby claimed under 35 USC 120. Reference is also made to U.S. application Ser. No. 561,245 (now U.S. Pat. No. 4,018,858) of even date corresponding to U.K. application No. 13834/74.
US Referenced Citations (4)
Foreign Referenced Citations (1)
Number |
Date |
Country |
979197 |
Jan 1965 |
GBX |
Divisions (1)
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Number |
Date |
Country |
Parent |
561347 |
Mar 1975 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
748702 |
Dec 1976 |
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