Production of ceramic moldings
AssigneeBASF SE
InventorsHans-Josef Sterzel, Gunther Mair
Life of this patent
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Abstract
Ceramic moldings, in particular those having geometrically complicated shapes, are produced by a process in which a ceramic powder is mixed with a molding additive and the mixture is injected into a mold. In order to improve the mechanical properties of the molding, a solution of a high molecular weight polymer in a solvent is used as the molding additive. The mixture is injected at a temperature below the boiling point of the solvent and under from 100 to 1,500 bar into a porous, gas-permeable mold which is at a temperature above the boiling point of the solvent, the injection pressure being maintained until gas no longer escapes from the molding material or the mold.
Claims5
A process for the production of a ceramic molding, the process comprising:
- (a) injecting a mixture containing a ceramic powder and a molding additive into a porous gas permeable mold that has an open-pore mold wall, wherein the molding additive is a solution of a high molecular weight polymer in a solvent, the ceramic powder is mixed at about 50-80% by volume with 50-20% by volume of the solution, the mixture is injected at a temperature below the boiling point of the solvent under a pressure of 100 to 1,500 bar, and the gas permeable mold is at a temperature above the boiling point of the solvent, so that some of the solvent is volatilized;
- and
- (b) sintering the remaining mixture, wherein the injection pressure is maintained until gas no longer escapes from the mixture or the mold.
Dependencies are inferred from the claim text.