C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
261/24
C04B 33/22 (2006.01)
Patent
CA 1164018
-24- ABSTRACT OF THE INVENTION A spinel containing slip-casting composition, a method for preparing the spinel slip-casting compo- sition and a method for casting the slip into usable forms are described. The spinel employed to prepare the castable slips is a pre-calcined spinel 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 and optionally with a molding aid. 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mold porous to water until the desired thickness of solid has been obtained and the excess "slip" decanted or otherwise withdrawn from the mold, i.e., drain cast method or the "slip" is solid cast and dried to produce a green solid casting. The green shape is retained in the mold until it gains green strength, one hour to five days, and thereafter placed in an oven wherein it is fired to a temperature above 1400°C for from one to 20 hours until it has reached its maximum density of between 55 and 99 percent of theoretical. Also dis- closed are mixtures of pre-fired spinels with calcined spinels of various heat histories to yield more durable green forms. In addition, there is disclosed slips prepared from mixtures of different spinel composi- tions. 29,253A-F -24-
384885
Bertelsman Dale M.
Eckert William M.
Morrow Stanley J.
Smart & Biggar
The Dow Chemical Company
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