Abstract: A method for measuring a heat generation distribution in a honeycomb structure includes: applying a voltage to a pair of electrode layers of the honeycomb structure to bring the honeycomb structure to an electrically conductive state; measuring resistance values Rn between two different points on the surface of an outer peripheral wall of the honeycomb structure; estimating a current value In flowing between the two points using Kirchhoff's law based on each of the resistance values Rn between the two different points, and calculating a heat value generated for each of the resistance values Rn based on each of the resistance values Rn and the current value In; and estimating a heat generation distribution in the honeycomb structure based on both the positions at which each of the resistance values Rn is measured, and the heat value calculated from each of the resistance values Rn, in the honeycomb structure.

Abstract: A honeycomb structure including a honeycomb portion having porous partition walls extending from an inflow end face to an outflow end face to define cells forming through channels, an outermost peripheral wall, and a pair of electrode portions disposed on a side surface of the honeycomb portion. The electrode portions are formed in a strip shape extending in a direction of the cells. In a cross section orthogonal to the extending direction, one electrode portion of the pair of electrode portions is disposed on a side opposed to the other electrode portion across a center of the honeycomb structure portion. The honeycomb structure portion includes end regions near the pair of electrode portions and a central region excluding the end regions. An average electric resistivity A of a material forming the end regions is lower than an average electric resistivity B of a material forming the central region.

Abstract: An electrically heating support includes: a pillar shaped honeycomb structure including: an outer peripheral wall; and a partition wall disposed on an inner side of the outer peripheral wall, the partition wall defining a plurality of cells, each of the plurality of cells extending from one end face to the other end face to form a flow path; and a pair of electrode layers disposed so as to face each other across a central axis of the honeycomb structure, each of the electrode layers being disposed on a surface of the outer peripheral wall of the honeycomb structure; and a metal terminal provided on each of the electrode layers. The honeycomb structure includes a ceramic having a PTC property, and the electrode layers include a ceramic having an NTC property.

Abstract: A honeycomb structure including a honeycomb having porous partition walls extending between inflow and outflow end faces to define cells, an outermost peripheral wall, and a pair of electrodes disposed on a side surface of the honeycomb. Each electrode is formed in a strip shape extending in a direction of the cells. In a cross section orthogonal to the extending direction of the cells, one electrode is disposed on a side opposed to the other electrode. The honeycomb has an outer peripheral region including the outer peripheral wall, a central region, and an intermediate region. An average electric resistivity A of a material constituted of the outer peripheral region, an average electric resistivity B of a material constituted of the central region and an average electric resistivity of C of a material constituted of the intermediate region satisfy the relationship: A?B<C.

Abstract: An electric heating support includes a honeycomb structure having an outer peripheral wall and interior porous partition walls defining a plurality of cells forming a flow path. A pair of electrode layers are disposed on a surface of the outer peripheral wall so as to face each other across a central axis of the honeycomb structure. Protective layers cover the electrode layers, respectively, such that at least a part of each electrode layer is exposed. A pair of metal terminals are provided on the electrode layers. Each electrode layer is composed of a metal-ceramic mixed member. A portion of each electrode layer that is exposed from the protective layer is electrically connected to each of the pair of metal terminals.

Abstract: An electric heating type support includes: an electrically conductive honeycomb structure including a pillar shaped honeycomb structure portion composed of conductive ceramics, the pillar shaped honeycomb structure portion including: an outer peripheral wall; and porous partition walls disposed on an inner side of the outer peripheral wall, the porous partition walls defining a plurality of cells, each cell penetrating from one end face to other end face to form a flow path; and a pair of metal terminals disposed so as to face each other across a central axis of the pillar shaped honeycomb structure portion, each metal terminal being joined to a surface of the electrically conductive honeycomb structure via a welded portion so as to follow a surface shape of the electrically conductive honeycomb structure.

Abstract: An electric heating type support includes: a pillar shaped honeycomb structure being configured to a ceramic, including: an outer peripheral wall; and a partition wall disposed on an inner side of the outer peripheral wall, the partition wall defining a plurality of cells, each of the cells extending from one end face to other end face to form a flow path; an electrode layer disposed on a surface of the outer peripheral wall of the pillar shaped honeycomb structure; two or more underlayers having conductivity, the underlayers being provided on the electrode layer so as to be spaced apart from each other; and a metal electrode provided on the underlayers. A surface of each of the underlayers has a concave portion forming a space between each of the underlayers and the metal electrode.

Abstract: An electric heating support includes an electrically conductive honeycomb structure having an outer peripheral wall and porous partition walls disposed on an inner side of the outer peripheral wall, the porous partition walls defining a plurality of cells, each cell penetrating from one end face to other end face to form a flow path. A pair of metal terminals are disposed so as to face each other across a central axis of the honeycomb structure, each metal terminal being joined to a surface of the honeycomb structure via a welded portion. The honeycomb structure is composed of ceramics and a metal. The honeycomb structure contains 40% by volume or less of the metal. The welded portion of the honeycomb structure has a surface containing 40% by volume or more of the metal.

Abstract: A columnar honeycomb structure comprising an outer peripheral side wall having an outer peripheral side surface; a plurality of partition walls that partition and form a plurality of cells penetrating from one bottom surface to another bottom surface to form flow paths, the plurality of partition walls being disposed inside the outer peripheral side wall; and a pair of terminal connection portions arranged on the outer peripheral side wall, wherein the honeycomb structure satisfies a relationship of H1>H2 in which: H1 represents an average height of the entire honeycomb structure; and H2 represents an average height of a portion of the honeycomb structure surrounded by a straight line M1 parallel to a line segment M and located at a distance of 0.1×L1 from the line segment M toward a first direction and a straight line M2 parallel to the line segment M and located at a distance of 0.

Abstract: A support for an electric heating type catalyst, comprising: a honeycomb structure having partition walls that define a plurality of cells, each cell extending from a first end face to a second end face to form a fluid path for a fluid; and a pair of metal electrode portions in which one metal electrode portion of the pair of metal electrode portions is disposed on a side opposite to the other metal electrode portion across a center axis of the honeycomb structure; wherein one or both of the pair of metal electrode portions comprise at least one protruding portion, the protruding portion projecting toward the honeycomb structure side to abut against the honeycomb structure.

Abstract: An electric heating type support includes: a pillar shaped honeycomb structure being configured to a ceramic, including: an outer peripheral wall; and a partition wall disposed on an inner side of the outer peripheral wall, the partition wall defining a plurality of cells, each of the cells extending from one end face to other end face to form a flow path; an electrode layer disposed on a surface of the outer peripheral wall of the pillar shaped honeycomb structure; two or more underlayers having conductivity, the underlayers being provided on the electrode layer so as to be spaced apart from each other; and a metal electrode provided on the underlayers. A surface of each of the underlayers has a concave portion forming a space between each of the underlayers and the metal electrode.

Abstract: A method for measuring a heat generation distribution in a honeycomb structure includes: applying a voltage to a pair of electrode layers of the honeycomb structure to bring the honeycomb structure to an electrically conductive state; measuring resistance values Rn between two different points on the surface of an outer peripheral wall of the honeycomb structure; estimating a current value In flowing between the two points using Kirchhoffs law based on each of the resistance values Rn between the two different points, and calculating a heat value generated for each of the resistance values Rn based on each of the resistance values Rn and the current value In; and estimating a heat generation distribution in the honeycomb structure based on both the positions at which each of the resistance values Rn is measured, and the heat value calculated from each of the resistance values Rn, in the honeycomb structure.

Abstract: An electric heating support includes a honeycomb structure having an outer peripheral wall and interior porous partition walls defining a plurality of cells forming a flow path. A pair of electrode layers are disposed on a surface of the outer peripheral wall so as to face each other across a central axis of the honeycomb structure. Protective layers cover the electrode layers, respectively, such that at least a part of each electrode layer is exposed. A pair of metal terminals are provided on the electrode layers. Each electrode layer is composed of a metal-ceramic mixed member. A portion of each electrode layer that is exposed from the protective layer is electrically connected to each of the pair of metal terminals.

Abstract: A columnar honeycomb structure includes an outer peripheral side wall having an outer peripheral side surface; a plurality of partition walls that partition and form a plurality of cells penetrating from one bottom surface to another bottom surface to form flow paths, the plurality of partition walls being disposed inside the outer peripheral side wall; and a pair of terminal connection portions arranged so as to be opposed to each other on the outer peripheral side surface of the outer peripheral side wall, wherein the honeycomb structure satisfies a relational expression of 1.3?L2/L1 in which: in a cross section perpendicular to a direction of the flow paths of the cells.

Abstract: An electric heating type support includes: an electrically conductive honeycomb structure including a pillar shaped honeycomb structure portion composed of conductive ceramics, the pillar shaped honeycomb structure portion including: an outer peripheral wall; and porous partition walls disposed on an inner side of the outer peripheral wall, the porous partition walls defining a plurality of cells, each cell penetrating from one end face to other end face to form a flow path; and a pair of metal terminals disposed so as to face each other across a central axis of the pillar shaped honeycomb structure portion, each metal terminal being joined to a surface of the electrically conductive honeycomb structure via a welded portion so as to follow a surface shape of the electrically conductive honeycomb structure.

Abstract: An electric heating support includes an electrically conductive honeycomb structure having an outer peripheral wall and porous partition walls disposed on an inner side of the outer peripheral wall, the porous partition walls defining a plurality of cells, each cell penetrating from one end face to other end face to form a flow path. A pair of metal terminals are disposed so as to face each other across a central axis of the honeycomb structure, each metal terminal being joined to a surface of the honeycomb structure via a welded portion. The honeycomb structure is composed of ceramics and a metal. The honeycomb structure contains 40% by volume or less of the metal. The welded portion of the honeycomb structure has a surface containing 40% by volume or more of the metal.

Abstract: A support for an electric heating type catalyst includes: a honeycomb structure; and a pair of metal electrode portions. One metal electrode portion of the pair of metal electrode portions is disposed on a side opposite to the other metal electrode portion across a center of the honeycomb structure. One or both of the pair of metal electrode portions includes: a plate-shaped body portion; and a plurality of tongue pieces each protruding from the body portion. A part of each tongue piece is in contact with the honeycomb structure.

Abstract: A support for an electric heating type catalyst, comprising: a honeycomb structure having partition walls that define a plurality of cells, each cell extending from a first end face to a second end face to form a fluid path for a fluid; and a pair of metal electrode portions in which one metal electrode portion of the pair of metal electrode portions is disposed on a side opposite to the other metal electrode portion across a center axis of the honeycomb structure; wherein one or both of the pair of metal electrode portions comprise at least one protruding portion, the protruding portion projecting toward the honeycomb structure side to abut against the honeycomb structure.

Abstract: A support for an electric heating catalyst includes: a honeycomb structure having partition walls extending between inflow and outflow to define cells forming a through channel; and an outer peripheral wall; a pair of electrode layers disposed on the outer peripheral wall; and a pair of electrode portions. Each of the electrode layers is formed in a strip extending in an extending direction of the cells. In a cross section orthogonal to the extending direction, one electrode layer is disposed on a side opposite to the other electrode layer across a center of the honeycomb structure. Each of the electrode layers is electrically connected to each of the electrode portions via two or more base layers, and the base layers are spaced apart from each other and include a metal material and a ceramic material.

Abstract: A support for an electric heating type catalyst includes: a honeycomb structure having: porous partition walls extending through the honeycomb structure from an inflow end face to an outflow end face to define a plurality of cells forming a through channel; and an outer peripheral wall located at the outermost periphery; a pair of electrode layers disposed on the outer peripheral wall of the honeycomb structure; and a pair of electrode portions. Each of the electrode layers is formed in a strip shape extending in an extending direction of the cell of the honeycomb structure. In a cross section orthogonal to the extending direction of the cell, one electrode layer of the pair of electrode layers is disposed on a side opposite to the other electrode layer across a center of the honeycomb structure. Each of the electrode layers is electrically connected to each of the electrode portions via two or more base layers, and the base layers have conductivity and are spaced apart from each other.