Porous honeycomb structure body, the use thereof and method for manufacturing the same
AssigneeNGK Insulators, Ltd.
InventorsYasushi Noguchi, Yukihisa Wada, Yumi Muroi
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Abstract
There are provided a porous honeycomb structure body capable of satisfying a pressure loss and isostatic strength which are mutually contradictory properties simultaneously and a method for manufacturing the same. In a porous honeycomb structure body having partition walls which contain cordierite as a primary crystal phase and have a porosity of 40 to 75% and an average pore diameter of 10 to 50 μm, porosity and an average pore diameter in a center portion of the structure body are made larger than porosity and an average pore diameter in a peripheral portion of the structure body.
Claims11
A porous honeycomb structure body having partition walls which contain cordierite as a primary crystal phase and have a porosity of 40 to 75% and an average pore diameter of 10 to 50 μm, wherein the porosity and the average pore diameter in a center portion of the honeycomb structure body are larger than those in a peripheral portion of the honeycomb structure body.
A method for manufacturing a porous honeycomb structure body, which comprises the steps of
- preparing a molded article having a honeycomb structure by use of a puddle containing a cordierite-forming raw material as a primary raw material and carbon in an amount of at least 5 parts by mass based on 100 parts by mass of the cordierite-forming raw material,
- drying and then firing the molded article,
- wherein upon firing of the molded article, an environment temperature is increased at a rate at which carbon existing in a center portion of the molded article is burned out at temperatures of the center portion of the molded article which range from 1,200° C. to lower than 1,430° C.
Dependencies are inferred from the claim text.