Honeycomb filter
AssigneeNGK Insulators, Ltd.
InventorsTadato Ito, Sho Inotsume
Life of this patent
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Abstract
A honeycomb filter comprising a pillar-shaped honeycomb structure having a porous partition wall disposed so as to surround a plurality of cells which serve as a fluid through channel extending from an inflow end face to an outflow end face and a porous plugging portion provided at either an end on the inflow end face side or an end on the outflow end face side of the cell, wherein in a processed image obtained by binarizing an electron microscope image of a visual field area of 480 μm×640 μm of the plugging portion, the plugging portion is composed of a plurality of particles, and the number of the particles having an area of 0.25 μm2 or more is 1000 or more and 3500 or less.
Claims4
A honeycomb filter comprising:
- a pillar-shaped honeycomb structure having a porous partition wall disposed so as to surround a plurality of cells which serve as a fluid through channel extending from an inflow end face to an outflow end face;
- and
- a porous plugging portion provided at either an end on the inflow end face side or an end on the outflow end face side of the plurality of cells;
- wherein in a processed image obtained by binarizing an electron microscope image of a visual field area of 480 μm×640 μm of the plugging portion, the plugging portion is composed of a plurality of particles, and 1000 or more and 3500 or less particles of the plurality of particles each have an area of 0.25 μm2 or more;
- and
- wherein in a particle size distribution of the particles of the plurality of particles having an area of 0.25 μm2 or more in the processed image, the area of the particles having a particle diameter d90 when the cumulative value is 90% is 5 μm2 or more and 62.5 μm2 or less.
Dependencies are inferred from the claim text.