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US 4,341,725 AGranted
Molding refractory and metal shapes by slip-casting
OwnerGerald Q. Weaver, Bruce G. Nelsoninventors
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Abstract
Dense, essentially flawless, complex refractory or metal shapes are formed by preparing a casting slip of fine refractory or metal powder wherein the slip liquid preferably contains 0.1 to 10% by weight of a hydrogen bond forming compound, casting the slip, freezing the cast slip, removing the solid form from the mold, drying, and finally firing to sinter the refractory or metal particles.
Claims6
A method of slip-casting, comprising the steps of:
- forming an appropriately shaped slip-casting mold;
- preparing a casting slip;
- casting said slip into said mold;
- freezing the cast slip;
- drying said frozen casting;
- and firing the green shape;
- wherein the improvement comprises;
- incorporating in said casting slip, an amount of a hydrogen bond forming compound sufficient to prevent the formation, in said frozen casting, of ice crystal large enough to result in scars in the dried casting.
5 more elements
Dependencies are inferred from the claim text.