Ceramic honeycomb structural body and method of manufacturing the same
AssigneeIbiden Co., Ltd.
InventorsKazushige Ohno, Hiroki Sato, Masayuki Hayashi
Life of this patent
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Abstract
A ceramic honeycomb structural body is manufactured by molding silicon carbide raw powders into a honeycomb pillar shape and then firing it to form a sintered body. The silicon carbide raw powders are comprised of about 60 to about 80% by mass of particles of first particle group having one frequency peak in the particle size distribution and a particle size of 1.0 μm to about 100 μm, and about 20 to about 40% by mass of particles of a second particle group having a particle size of about 0.1 μm or more and less than 1.0 μm.
Claims8
A method of manufacturing a ceramic honeycomb structural body, which comprises mixing silicon carbide raw powders, mixing it to prepare ceramic powder raw materials, molding the resulting ceramic powder raw materials into a honeycomb pillar shape, and firing it to form a sintered body, wherein said silicon carbide raw powders are comprised of about 60 to about 80% by mass of particles belonging to a first particle group having a particle size of 1.0 μm to about 100 μm, and about 20 to about 40% by mass of particles belonging to a second particle group having a particle size of about 0.1 μm or more and less than 1.0 μm in which the particles of the first particle group has one frequency peak in a particle size distribution curve wherein an abscissa is a particle size (μm) and an ordinate is a frequency (%) and satisfy the following relationship:
- (D90−D10)/D50≦about 2.0
- wherein D90:
- particle size with an oversize of 90% by mass in cumulative particle size distribution;
- D10:
- particle size with an oversize of 10% by mass in cumulative particle size distribution;
- and
- D50:
- particle size with an oversize of 50% by mass in cumulative particle size distribution.
A method of manufacturing a ceramic honeycomb structural body, which comprises mixing silicon carbide raw powders, mixing it to prepare ceramic powder raw materials, molding the resulting ceramic powder raw materials into a honeycomb pillar shape, and firing it to form a sintered body having a porosity of about 50 to about 60% by volume, wherein said silicon carbide raw powders are comprised of about 60 to about 70% by mass of particles belonging to a first particle group having a particle size of 1.0 μm to about 100 μm, and about 30 to about 40% by mass of particles belonging to a second particle group having a particle size of about 0.1 μm or more and less than 1.0 μm in which the particles of the first particle group has one frequency peak in a particle size distribution curve wherein an abscissa is a particle size (μm) and an ordinate is a frequency (%) and satisfy the following relationship:
- about 1.2≦(D90−D10)/D50≦about 1.8
- wherein D90:
- particle size with an oversize of 90% by mass in cumulative particle size distribution;
- D10:
- particle size with an oversize of 10% by mass in cumulative particle size distribution;
- and
- D50:
- particle size with an oversize of 50% by mass in cumulative particle size distribution.
Dependencies are inferred from the claim text.