Hitachi Metals, Ltd.

Tomomasa Kumagai

Hirohisa Suwabe

Masaru Yoshida

Hideya Yamane

A honeycomb structure having crystal phases of aluminum titanate and mullite, which is obtained by sintering a honeycomb molding made of a mixture comprising titania powder, alumina powder, silica powder and mullite powder, the mixture containing 1-10 parts by mass of silica powder and 5-30 parts by mass of mullite powder per the total amount (100 parts by mass) of the titania powder and the alumina powder, and the mullite powder containing 40-60% by mass of particles having particle sizes of 10-50 gm and 5-30% by mass of particles having particle sizes of 3 gm or less, and its production method.

Ceramic honeycomb structure and its production method

A ceramic honeycomb structure having a large number of flow paths partitioned by porous cell walls, the cell walls comprising at least main crystals of aluminum titanate, in which MgO and SiOare dissolved to form a solid solution, and glass phases, the glass phases containing 40-80% by mass of SiOand 1-20% by mass of MgO, the average size of the glass phases being 30 &#x3bc;m or less in a cross section of the cell walls, and the area ratio of the glass phases to the total area of the main crystals of aluminum titanate and the glass phases being 2-12% in a cross section of the cell walls, and its production method.

Aluminum-titanate-based ceramic honeycomb structure, its production method, and starting material powder for producing same

A method for producing an aluminum-titanate-based ceramic honeycomb structure comprising blending TiOsource powder and AlOsource powder with a TiO/AlOmolar ratio of 45/55 to 55/45, and a sintering aid and/or a molding aid to prepare a moldable material, extrusion-molding the moldable material, and drying and sintering the resultant extrudate, the TiOsource powder having a particle size distribution (mass-based frequency distribution relative to [log(particle size)]), in which both the maximum frequency in a particle size range of 0.2-4 &#x3bc;m and the maximum frequency in a particle size range of 10-100 &#x3bc;m are larger than those in other ranges than the two particle size ranges.

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Miyako-gun, Japan

Tomomasa Kumagai