US 12,343,715 B2
Pillar-shaped honeycomb structure
Shuji Muramatsu, Nagoya (JP); and Yasuhiro Shiga, Nagoya (JP)
Assigned to NGK INSULATORS, LTD., Nagoya (JP)
Filed by NGK Insulators, Ltd., Nagoya (JP)
Filed on Mar. 9, 2023, as Appl. No. 18/180,950.
Claims priority of application No. 2022-060626 (JP), filed on Mar. 31, 2022.
Prior Publication US 2023/0311112 A1, Oct. 5, 2023
Int. Cl. B01J 35/56 (2024.01); B01J 35/31 (2024.01); B01J 35/40 (2024.01); B01J 35/64 (2024.01)
CPC B01J 35/56 (2024.01) [B01J 35/31 (2024.01); B01J 35/40 (2024.01); B01J 35/657 (2024.01)] 8 Claims
OG exemplary drawing
 
1. A pillar-shaped honeycomb structure, comprising an outer peripheral side wall, and a plurality of partition walls disposed on an inner peripheral side of the outer peripheral side wall and partitioning a plurality of cells forming flow paths from a first end surface to a second end surface,
wherein an average pore diameter of the partition walls measured by a mercury intrusion method specified in JIS R1655: 2003 is 3 to 10 μm, and
when a cross-section of the plurality of partition walls is observed with an X-ray microscope and a porosity (%) is measured in a thickness direction from one surface to the other surface of each partition wall, assuming PAVE is an average porosity of each partition wall, P1MIN is a minimum porosity from the one surface to a thickness of 5% of the partition wall, and P2MIN is a minimum porosity from the other surface to a thickness of 5% of the partition wall, 40%≤PAVE≤70%, and {(P1MIN+P2MIN)/2}/PAVE≤0.9 are satisfied.