C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
261/33
C04B 33/22 (2006.01) C04B 33/28 (2006.01) C04B 35/443 (2006.01)
Patent
CA 1192918
ABSTRACT OF THE INVENTION A spinel containing slip-casting composition, method for preparing the spinel slip-casting composi- tion and method for casting the slip into usable forms are described. The spinel employed to prepare the castable slips is a pre-calcined spinel and a calcined spinel each prepared in the manner of copending Canadian application Serial No. 384,887, filed August 31, 1981, which is ball-milled with water, then mixed with a deflocculant at pH 9 or below. The slurry or "slip" is cast into a mold porous to water until the desired thickness of solid has been obtained and the excess "slip" decanted or otherwise withdrawn from the mold. The green shape is retained in the mold until it gains green strength, 1 hour to 5 days, and thereafter placed in an oven wherein it is fired to a temperature above about 1400°C for from 1 to 20 hours until it has reached its maximum density of between about 50 and 99 percent of theoretical.
395507
Smart & Biggar
The Dow Chemical Company
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