Ceramic filter and manufacturing method therefor

A method for manufacturing an integrally-formed open-topped tubular ceramic filter for removing contaminant from molten metal, the method comprising the steps of:

• kneading a mixture of an aggregate comprising ceramic particles, a predetermined binding agent, and water to prepare dough;
• integrally forming a precursor of an open-topped tubular ceramic filter from the prepared dough;
• drying the precursor;
• coating only part of the dried precursor with a layer made of a material that is stable against the molten metal and an oxide thereof and that has a sintering temperature lower than a sintering temperature of the dough of the precursor, wherein upper edges of an outer surface and an inner surface of a side wall of the precursor are coated;
• and
• subsequently sintering the precursor.

A method for manufacturing an integrally-formed open-topped tubular ceramic filter for removing contaminant from molten metal, the method comprising the steps of:

• kneading an aggregate comprising ceramic particles, a predetermined binding agent, and water to prepare a mixture;
• integrally forming a precursor of an open-topped tubular ceramic filter from the prepared mixture;
• drying the precursor;
• and
• subsequently sintering the precursor, wherein
• in the step of integrally forming a precursor, the mixture is filled into a space between an outer mold and an inner mold, wherein the inner mold is made of a foamed resin material and a surface thereof is coated with a heat-shrinkable resin tape as a protective film, and
• in the drying step, the precursor is warmed together with the inner mold to thermally shrink the inner mold.