| 摘要 |
<p>A process for producing a cordierite-based ceramic honeycomb structure, includes, kneading raw materials for cordierite formation with a forming aid to obtain a raw material batch, subjecting the raw material batch to extruding to obtain a formed honeycomb structure, and subjecting the formed honeycomb structure to drying and firing in this order to obtain the cordierite-based ceramic honeycomb structure whose crystal phase is composed mainly of cordierite. The raw material batch contains 65% by weight or more of raw materials for cordierite formation comprising talc, kaolin and aluminum hydroxide and having crystal water. The kaolin has an average particle diameter of 5 mu m or more and a BET specific surface area of 10 m<2>/g or less and is contained in the raw material batch in an amount of 10 % by weight or more. According to the process, the formability during extruding, particularly lubricity and shape stability is improved and there can be produced a cordierite-based ceramic honeycomb structure having a thin partition wall and a high cell density and possessing improved mechanical strength (isostatic fracture strength) and improved catalyst coatability.</p> |
