Abstract: A heater element includes: a honeycomb structure including 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; a pair of electrode layers provided on the outer peripheral wall and the partition walls on the first end face and the second end face; and terminals capable of electrically connecting the electrode layers to a conducting wire. At least a part of each of the electrode layers has an extending portion extending outwardly from an outer edge of each of the first end face and the second end face. Each of the terminals is connected to the extending portion and disposed to face a side surface of the honeycomb structure.

Abstract: A heater includes: a first cordierite substrate; a glass portion provided on the first cordierite substrate; and an electrically heating portion embedded in the glass portion, wherein the glass portion comprises MgO, Al2O3 and SiO2.

Abstract: A heater element with a functional material-containing layer includes: a honeycomb structure including 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, at least the partition walls being made of a material having a PTC property; a pair of electrodes provided on the first end face and the second end face of the honeycomb structure; and a functional material-containing layer provided on a surface of the partition walls.

Abstract: A honeycomb filter includes a pillar-shaped honeycomb substrate having a porous partition wall and a plugging portion provided so as to plug end at any one of the inflow end face side or the outflow end face side of the cell, wherein in a section orthogonal to the extending direction of the cell, the shape of the cell is hexagonal, the partition wall includes a first partition wall disposed between the inflow cell and the outflow cell and a second partition wall disposed between the inflow cells, and the first partition wall has a porous trapping layer on its surface for trapping particulate matter in exhaust gas, and the second partition wall has no trapping layer on its surface or has a trapping layer thinner than the trapping layer disposed on the surface of the first partition wall.

Abstract: A honeycomb filter includes a pillar-shaped honeycomb substrate having a porous partition wall and a plugging portion provided so as to plug end at any one of the inflow end face side or the outflow end face side of the cell, wherein in a section orthogonal to the extending direction of the cell, the shape of the cell is hexagonal, the partition wall includes a first partition wall disposed between the inflow cell and the outflow cell and a second partition wall disposed between the inflow cells, and the first partition wall has a porous trapping layer on its surface for trapping particulate matter in exhaust gas, and the second partition wall has no trapping layer on its surface or has a trapping layer thinner than the trapping layer disposed on the surface of the first partition wall.