Patent ID: 7429351
Filing Date: 2008-09-30
Classification: C04B

Abstract:
1. A method for manufacturing a porous ceramic structure, comprising: molding a raw material containing a ceramic material capable of forming cordierite by firing as a main component and a pore-forming agent; and drying and firing the molded article, wherein the raw material is one containing at least two kinds of pore-forming agents having different burning temperature ranges, the temperature of a firing environment is raised while controlling the temperature of a firing environment within a range of −150° C. to +50° C. from the temperature of the central portion of the molded article within a range where at least a portion of the molded article reaches 800° C. to 1,200° C., the control of the temperature is done by selecting an amount of a first pore forming agent which burns at 400° C. to 1,200° C., and selecting an amount of a second pore forming agent which burns at temperatures below 400° C., to control the temperature of the firing environment to within a range of −150° C. to +50° C. from the temperature of the central portion of the molded article, the control of the temperature is done by decreasing the amount of the first pore-forming agent, but increasing the amount of the second pore-forming agent when the temperature of firing environment is expected to be lower than the range of −150° C. to +50° C. in comparison with the temperature of the central portion of the molded article, and the molded article contains 5 to 25 parts by mass of carbon and 1 to 5 parts by mass of a foamable resin or foamed resin based on 100 parts by mass of the cordierite-forming raw material.