Abstract: A heater element assembly includes a heater element, a cushioning material, and a frame body, the heater element includes: a honeycomb structure portion capable of generating heat when energized; a first electrode layer that covers a part or all of a surface of the partition walls forming the first end surface; a second electrode layer that covers a part or all of a surface of the partition walls forming the second end surface; a first terminal connected to an outer surface of the first electrode layer; and a second terminal connected to an outer surface of the second electrode layer; wherein the frame body includes a first frame portion which is made of resin and has an inner peripheral surface that fits with an outer peripheral surface of the outer peripheral wall of the honeycomb structure portion via the cushioning material.

Abstract: A heater element assembly includes a heater element, and frame body, the heater element including: a honeycomb structure portion capable of generating heat when energized; a first electrode layer that covers a part or all of a surface of the partition walls forming the first end surface; a second electrode layer that covers a part or all of a surface of the partition walls forming the second end surface; a first terminal connected to an outer surface of the first electrode layer; and a second terminal connected to an outer surface of the second electrode layer; the frame body comprising a first frame portion made of resin and a second frame portion made of resin for clamping the heater element from a side of the first end surface and a side of the second end surface.

Abstract: A heater element for vehicle air conditioning includes: a honeycomb structure having an outer peripheral wall and partition walls disposed on an inner side of the outer peripheral wall, the partition walls defining a plurality of cells, each of the cells extending from a first end face to a second end face to form a flow path; and a pair of electrodes provided on the first end face and the second end face. The partition walls have a thickness of 0.14 mm or less.

Abstract: A heater element for vehicle air conditioning includes: a honeycomb structure having: a plurality of pillar shaped honeycomb segments each having an outer peripheral wall and partition walls disposed on an inner side of the outer peripheral wall, the partition walls defining a plurality of cells, each of the cells extending from a first end face to a second end face to form a flow path; and joining layers for joining surfaces of the outer peripheral walls of the plurality of pillar shaped honeycomb segments parallel to an extending direction of the cells; and a pair of electrodes provided on surfaces of the outer peripheral wall, the partition walls and the joining layers on the first end face and the second end face. The partition walls have a thickness of 0.1016 to 0.1397 mm. The joining layers have a thickness of 1.0 to 5.0 mm.

Abstract: A honeycomb structure, including: a plurality of pillar shaped honeycomb segments, each of the pillar shaped honeycomb segments including a partition wall and a plugged portion; and a joining layer arranged so as to join side surfaces of the pillar shaped honeycomb segments to each other. The honeycomb structure satisfies the following equations (1) to (3): y?1000??(1); y?717.92x?0.095??(2); and y?462.4x?0.153??(3), in which y is a maximum temperature (° C.) at which the use of the honeycomb structure is accepted, and x is a thermal conduction factor represented by the following equation: thermal conduction factor=(thermal conductivity of the partition wall×thermal conductivity of the joining layer)/(average thickness of the joining layer×porosity of the partition wall).

Abstract: A honeycomb structure, including: a plurality of pillar shaped honeycomb segments, each of the pillar shaped honeycomb segments including a partition wall and a plugged portion; and a joining layer arranged so as to join side surfaces of the pillar shaped honeycomb segments to each other. The honeycomb structure satisfies the following equations (1) to (3): y?1000??(1); y?717.92x?0.095??(2); and y?462.4x?0.153??(3), in which y is a maximum temperature (° C.) at which the use of the honeycomb structure is accepted, and x is a thermal conduction factor represented by the following equation: thermal conduction factor=(thermal conductivity of the partition wall×thermal conductivity of the joining layer)/(average thickness of the joining layer×porosity of the partition wall).

Abstract: A honeycomb filter including: a pillar-shaped honeycomb structure including porous partition walls; and porous plugging portions disposed on either one of end portions of each of the cells, wherein a porosity (%) of the partition walls is defined as P1, a porosity (%) of the plugging portions is defined as P2, an occupancy (%) of the partition walls relative to an area of a cross section orthogonal to an extending direction of the cells of the honeycomb structure is defined as N1, the P1 is 50 to 65%, the P2 is 60 to 70%, the N1 is 22 to 39%, and X represented by Formula (1) satisfies a relation of Formula (2): X=P1/P2×N1,??Formula (1): 18.80??0.19X2+11.33X?121.63?50.50.

Abstract: A honeycomb filter including: a pillar-shaped honeycomb structure including porous partition walls; and porous plugging portions disposed on either one of end portions of each of the cells, wherein a porosity (%) of the partition walls is defined as P1, a porosity (%) of the plugging portions is defined as P2, an occupancy (%) of the partition walls relative to an area of a cross section orthogonal to an extending direction of the cells of the honeycomb structure is defined as N1, the P1 is 50 to 65%, the P2 is 60 to 70%, the N1 is 22 to 39%, and X represented by Formula (1) satisfies a relation of Formula (2): X=P1/P2×N1,??Formula (1): 18.80??0.19X2+11.33X?121.63?50.50.