| 摘要 |
PURPOSE:To obtain a sintered article of a required size by specifying calcination conditions at the time of calcining the honeycomb structural body obtd. by extrusion molding of the compd. of ceramics raw materials forming cordierite. CONSTITUTION:The chemical compsn. of the essential components consists, by weight, of 42 to 56% SiO2, 30 to 45% Al2O3, and 12 to 16% MgO. Talc, kaolin, and other cordierite forming raw materials are so mixed that the essential components of the crystal phase consist of the cordierite. These materials are mixed and kneaded and a molding assistant and/or molding agent is added to the mixture prepd. in such a manner. The mixture is then plasticized extrudably and is extrusion-molded to the honeycomb structural body. The resulting honeycomb structural body is calcined by controlling the heating up temp. at the time of calcination to <=60 deg.C/hr in the temp. region where the body shrinks thermally or by stopping the heating up for a prescribed period of time or by combining both. The phenomenon in which the shrinkage ratio is varied by a difference in temp. in the respective parts of the honeycomb structural body is relieved or decreased by this method. |
