| 摘要 |
A ceramic honeycomb structure having a large number of flow paths defined by porous cell walls; said porous cell walls being composed of cordierite crystals, mullite crystals, corundum crystals and/or spinel crystals; the percentage of the X-ray diffraction intensity of the cordierite crystals being 72% or more and less than 85%, the percentage of the X-ray diffraction intensity of the mullite crystals being 15-25%, and the percentage of the total X-ray diffraction intensity of the corundum crystals and the spinel crystals being 5% or less, per the total X-ray diffraction intensity of these crystals; said porous cell walls having a true density of 2.55-2.70 g/cm3, a mean pore diameter of 10-20 mum, and a porosity of 50-65%; the volume of pores having diameters exceeding 50 mum being 8-25% of the total pore volume, the volume of pores having diameters of less than 10 mum being 16-25% of the total pore volume, and the pore diameter distribution deviation sigma being 0.5 or less.
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