US 11,725,557 B2
Electric heating type carrier and exhaust gas purification device
Hirotaka Saito, Komaki (JP); and Naoki Yoshida, Ichinomiya (JP)
Assigned to NGK INSULATORS, LTD., Nagoya (JP)
Filed by NGK Insulators, Ltd., Nagoya (JP)
Filed on Mar. 16, 2022, as Appl. No. 17/655,047.
Claims priority of application No. JP2021-061939 (JP), filed on Mar. 31, 2021; and application No. JP2022-016551 (JP), filed on Feb. 4, 2022.
Prior Publication US 2022/0316379 A1, Oct. 6, 2022
Int. Cl. F01N 3/20 (2006.01); F01N 3/28 (2006.01)
CPC F01N 3/2026 (2013.01) [F01N 3/281 (2013.01); F01N 2240/16 (2013.01); F01N 2330/02 (2013.01); F01N 2330/30 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An electric heating type carrier, comprising:
a conductive honeycomb structure portion having an outer peripheral wall and partition walls that are disposed inside the outer peripheral wall and partition a plurality of cells forming flow paths from one end surface to the other end surface;
a first electrode layer provided in a band shape in a direction in which the cells extend on a surface of the outer peripheral wall; and
a second electrode layer provided in a band shape in a direction in which the cells extend on the surface of the outer peripheral wall, the second electrode layer provided so as to oppose the first electrode layer with a central axis of the honeycomb structure portion interposed therebetween;
wherein
in a cross-section orthogonal to the direction in which the cells extend, the honeycomb structure portion is classified into three regions of:
a first resistance region having a contact portion with the first electrode layer,
a second resistance region having a contact portion with the second electrode layer, and
a third resistance region that does not come into contact with either the first electrode layer or the second electrode layer, and traverses the cross-section so as to be sandwiched between the first resistance region and the second resistance region; and
the third resistance region has a higher electrical resistance per unit volume (1 cm3) than an electrical resistance per unit volume (1 cm3) of the first resistance region and the second resistance region.