Method of producing cordierite ceramic honeycomb
AssigneeNGK Insulators, Ltd.
InventorsYasushi Noguchi, Kyoko Makino
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Abstract
A method of producing a cordierite ceramic honeycomb including the steps of: preparing raw materials becoming cordierite and forming agents; adding the forming agents into the raw materials for cordierite generation; mixing the forming agents and the raw materials to obtain a raw material batch; extruding the raw material batch to obtain a formed body; drying the formed body; and sintering the formed body after drying; so as to obtain a honeycomb structural body having a cordierite crystal phase as a main ingredient. In this method, at the sintering step, a temperature descending rate at least from a maximum temperature to 1300° C. is not larger than 100° C./hour.
Claims14
A method of producing a cordierite ceramic honeycomb comprising the steps of:
- preparing raw materials becoming cordierite and forming agents;
- adding the forming agents into the raw materials becoming cordierite;
- mixing the forming agents and the raw materials to obtain a raw material batch;
- extruding the raw material batch to obtain a formed body;
- drying the formed body;
- and
- sintering the formed body after drying, so as to obtain a honeycomb structural body having a cordierite crystal phase as a main ingredient, wherein, at the sintering step, a temperature descending rate at least from a maximum temperature greater than 1300° C. to 1300° C. is not larger than 100° C./hour, and wherein quartz is used in the raw material batch becoming cordierite and alumina having an average particle size larger than 2 μm is used.
A method of producing a cordierite ceramic honeycomb comprising the steps of:
- preparing raw materials becoming cordierite and forming agents;
- adding the forming agents into the raw materials becoming cordierite;
- mixing the forming agents and the raw materials to obtain a raw material batch;
- extruding the raw material batch to obtain a formed body;
- drying the formed body;
- and
- sintering the formed body after drying, so as to obtain a honeycomb structural body having a cordierite crystal phase as a main ingredient, wherein, at the sintering step, a temperature descending rate at least from a maximum temperature greater than 1300° C. to 1300° C. is not larger than 100° C./hour, and wherein lauric acid potash soap is used as a forming agent.
A method of producing a cordierite ceramic honeycomb comprising the steps of:
- preparing raw materials becoming cordierite and forming agents;
- adding the forming agents into the raw materials becoming cordierite;
- mixing the forming agents and the raw materials to obtain a raw material batch;
- extruding the raw material batch to obtain a formed body;
- drying the formed body;
- and
- sintering the formed body after drying, so as to obtain a honeycomb structural body having a cordierite crystal phase as a main ingredient, wherein, at the sintering step, a temperature descending rate at least from a maximum temperature greater than 1300° C. to 1300° C. is not larger than 100° C./hour, and wherein a temperature descending rate from the maximum temperature to 1250° C. is not larger than 50° C./hour.
A method of producing a cordierite ceramic honeycomb comprising the steps of:
- preparing raw materials becoming cordierite and forming agents;
- adding the forming agents into the raw materials becoming cordierite;
- mixing the forming agents and the raw materials to obtain a raw material batch;
- extruding the raw material batch to obtain a formed body;
- drying the formed body;
- and
- sintering the formed body after drying, so as to obtain a honeycomb structural body having a cordierite crystal phase as a main ingredient, wherein, at the sintering step, a temperature descending rate at least from a maximum temperature greater than 1300° C. to 1300° C. is not larger than 100° C./hour, and wherein the maximum temperature is 1425° C.
Dependencies are inferred from the claim text.