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US 5,690,724 AGranted
Process and composition for slip casting a ceramic powder
AssigneeCaterpillar Inc.
InventorsVirgil R. Hester, Kurtis C. Kelley, Michael C. Long
Life of this patent
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Abstract
A process and composition are disclosed for slip casting a ceramic powder in a porous mold. In this invention, a ceramic powder is blended with a polymeric cellulose ether. A slurry of ceramic powder-cellulose ether is formed. A porous mold is coated with a hydrophilic colloid of ammonium alginate to form a treated mold. The slurry is then poured in the treated mold and a slip is formed. This invention is particularly useful for forming crack-free slips made from difficult to cast ceramic powders.
Claims6
A ceramic slip composition, comprising:
- a ceramic powder;
- a polymeric cellulose ether having a general formula;
- ##STR5## wherein R.sub.1 is selected from the group consisting of CH.sub.3 and CH.sub.2 CH(OH)CH.sub.3 ;
- R.sub.2 is selected from the group consisting of CH.sub.3 and CH.sub.3 CH(OCH.sub.3)CH.sub.3 ;
- R.sub.3 is selected from a group consisting of H and CH.sub.3 ;
- and the value of n is at least 100;
- water;
- said ceramic powder and said polymeric cellulose ether being present in a weight ratio in the range of about 100:0.25 to about 100:1.25 ceramic powder:polymeric cellulose ether;
- said blend of ceramic powder and polymeric cellulose ether being present in said water in a weight ratio of about 0.9:1.0 to about 1.0:0.9 blend:water;
- and
- said ceramic slip composition having a viscosity in the range of about 1000 cP to about 5000 cP.
8 more elements
Dependencies are inferred from the claim text.