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Cordierite-type ceramic honeycomb structure and its production method
A cordierite-type ceramic honeycomb structure having large numbers of flow paths partitioned by porous cell walls; the cell walls having (a) porosity of more than 65% and 75% or less, (b) in a pore diameter distribution measured by mercury porosimetry, (i) a pore diameter d10 at a cumulative pore volume corresponding to 10% of the total pore volume being less than 50 μm, a pore diameter (median pore diameter) d50 at 50% being 18-27 μm, a pore diameter d90 at 90% being 10 μm or more, and (d10−d90)/d50 being 2.3 or less; (ii) σ[=log(d20)−log(d80)] being 0.25 or less, wherein σ represents the difference between a logarithm of a pore diameter d20 at a cumulative pore volume corresponding to 20% of the total pore volume and a logarithm of a pore diameter d80 at a cumulative pore volume corresponding to 80% of the total pore volume; and (iii) the maximum of the inclination Sn=−(Vn−Vn−1)/[log(dn)−log(dn−1)] of a curve of a cumulative pore volume to a pore diameter being 3 or more, wherein dn and Vn are respectively a pore diameter and a cumulative pore volume at an n-th measurement point, and dn−1 and Vn−1 are respectively a pore diameter and a cumulative pore volume at a (n−1)-th measurement point.
Cordierite-type ceramic honeycomb structure and its production method
A cordierite-type ceramic honeycomb structure having large numbers of flow paths partitioned by porous cell walls; the cell walls having (a) porosity of more than 65% and 75% or less, (b) in a pore diameter distribution measured by mercury porosimetry, (i) a pore diameter d10 at a cumulative pore volume corresponding to 10% of the total pore volume being less than 50 μm, a pore diameter (median pore diameter) d50 at 50% being 18-27 μm, a pore diameter d90 at 90% being 10 μm or more, and (d10−d90)/d50 being 2.3 or less; (ii) σ[=log(d20)−log(d80)] being 0.25 or less, wherein σ represents the difference between a logarithm of a pore diameter d20 at a cumulative pore volume corresponding to 20% of the total pore volume and a logarithm of a pore diameter d80 at a cumulative pore volume corresponding to 80% of the total pore volume; and (iii) the maximum of the inclination Sn=−(Vn−Vn−1)/[log(dn)−log(dn−1)] of a curve of a cumulative pore volume to a pore diameter being 3 or more, wherein dn and Vn are respectively a pore diameter and a cumulative pore volume at an n-th measurement point, and dn−1 and Vn−1 are respectively a pore diameter and a cumulative pore volume at a (n−1)-th measurement point.
Cordierite-type ceramic honeycomb structure and its production method
OKAZAKI SHUNJI (author)
2017-07-18
Patent
Electronic Resource
English
IPC:
B01D
SEPARATION
,
Trennen
/
B01J
Chemische oder physikalische Verfahren, z.B. Katalyse oder Kolloidchemie
,
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY
/
B28B
Formgeben von Ton oder anderen keramischen Stoffzusammensetzungen, Schlacke oder von Mischungen, die zementartiges Material enthalten, z.B. Putzmörtel
,
SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS, SLAG OR MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
/
C04B
Kalk
,
LIME
/
F01N
GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL
,
Schalldämpfer oder Auspuffvorrichtungen für Gase von Kraft- und Arbeitsmaschinen oder von Kraftmaschinen allgemein
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