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US 7,517,490 B2Granted
Method of manufacturing ceramic green body
AssigneeNGK Insulators, Ltd.
InventorSugio Miyazawa
Life of this patent
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Abstract
A ceramic green body is formed by gelcasting. The ceramic green body is heated in the mold so that a solvent contained in the ceramic green body is moved to form a solvent film between the outer surface of the ceramic green body and the inner surface of the mold. The solvent film facilitates release of the ceramic green body from the mold, thereby preventing the occurrence of damage to the ceramic green body as the ceramic green body is released from the mold.
Claims10
A method of manufacturing a ceramic green body comprising the steps of:
- molding a ceramic slurry in a mold to form a solid green body, the ceramic slurry containing a ceramic powder and a solvent, the solvent containing a dispersion medium comprising an organic compound selected from the group consisting of esters, polyhydric alcohols, polybasic acid, polybasic acid esters and esters of polyhydric alcohol, a catalyst for a gelation reaction, and a gelling agent comprising an organic compound comprising at least one of an isocyanate group and an isothiocyanate group;
- and
- releasing the solid green body from the mold, wherein the step of releasing the solid green body from the mold includes heating the solid green body in the mold so that the solvent of the ceramic slurry that is still contained within the solid green body moves toward an exterior portion of the solid green body, and subsequently the solid green body is released from the mold.
A method of manufacturing a ceramic green body comprising the steps of:
- providing a ceramic slurry containing a ceramic powder and a solvent, the solvent containing a dispersion medium comprising an organic compound selected from the group consisting of esters, polyhydric alcohols, polybasic acid, polybasic acid esters and esters of polyhydric alcohol, a catalyst for a gelation reaction, and a gelling agent comprising an organic compound comprising at least one of an isocyanate group and an isothiocyanate group;
- providing a mold comprising an outer mold formed from an unmeltable material and a core, formed from a meltable material, contained in the outer mold to define a predetermined cavity between the core and the outer mold;
- casting the ceramic slurry into the cavity formed in the mold to form a hollow green body having a cavity therein;
- and
- releasing the hollow green body from the outer mold by heating the hollow green body in the outer mold so that the solvent of the ceramic slurry that is still contained within the hollow green body moves toward an exterior portion of the hollow green body, and subsequently the hollow green body is released from the outer mold.
2 more elements
Dependencies are inferred from the claim text.