摘要:
A honeycomb structure includes a tubular honeycomb structure body having porous partition walls to define and form a plurality of cells and an outer peripheral wall, and a pair of electrodes disposed on a side surface of the honeycomb structure body. An electrical resistivity of the honeycomb structure body is from 1 to 200 Ωcm, each of the pair of electrodes is formed into a band-like shape extending in an extending direction of the cells of the honeycomb structure body, one electrode in the pair of electrodes is disposed on a side opposite to the other electrode in the pair of electrodes via a center of the honeycomb structure body, the honeycomb structure body has a central region and an outer peripheral region, and an electrical resistivity of the central region is lower than an electrical resistivity of the outer peripheral region.
摘要:
A honeycomb structure includes a tubular honeycomb structure body having porous partition walls to define and form a plurality of cells and an outer peripheral wall, and a pair of electrodes disposed on a side surface of the honeycomb structure body. An electrical resistivity of the honeycomb structure body is from 1 to 200 Ωcm, each of the pair of electrodes is formed into a band-like shape extending in an extending direction of the cells of the honeycomb structure body, one electrode in the pair of electrodes is disposed on a side opposite to the other electrode in the pair of electrodes via a center of the honeycomb structure body, the honeycomb structure body is constituted of an outer peripheral region and a central region, and an electrical resistivity of a material constituting the outer peripheral region is lower than an electrical resistivity of a material constituting the central region.
摘要:
A honeycomb structure includes a center part which has a cylindrical honeycomb structure part with a porous partition wall and an outer circumferential wall defining a plurality of cells, and which has a pair of electrodes disposed on the side surface of the honeycomb structure part. The honeycomb structure also includes an outer circumferential part disposed around the center part. The electric resistivity of the honeycomb structure part is 1-200 Ωcm. Each electrode in the electrode pair is formed in a band shape that extends in the direction that the cells extend. In a cross section, one electrode is located opposite the other electrode over the center of the honeycomb structure part. The outer circumferential part has a porous partition wall and an outer circumferential wall that define a plurality of cells. The volumetric heat capacity of the outer circumferential part is smaller than that of the center part.
摘要:
A honeycomb structure includes a tubular bonded honeycomb segment assembly having a plurality of honeycomb segments and a bonding layer which bonds side surfaces of the plurality of honeycomb segments to each other; and a pair of electrode members disposed on a side surface of the bonded honeycomb segment assembly, a volume resistivity of each of the honeycomb segments is from 1 to 200 Ωcm, at least a part of the bonding layer is made of a bonding material having a conductivity, a volume resistivity of the bonding layer is from 2 to 2000 Ωcm, and each of the pair of electrode members is formed into a band-like shape extending in an extending direction of the cells of the bonded honeycomb segment assembly, and one electrode member is disposed on a side opposite to the other electrode member via a center of the bonded honeycomb segment assembly.
摘要:
A honeycomb structure includes a tubular honeycomb structure body including porous partition walls defining a plurality of cells, and an outer peripheral wall and a pair of electrode parts disposed on a side face of the honeycomb structure body, wherein the honeycomb structure body has electric resistivity of 1 to 200 Ωcm, each electrode part has a belt-like shape extending in an extending direction of the cells, each electrode part is placed on an opposite side each other across a center of the honeycomb structure body, the honeycomb structure body includes an inflow-side area that is an area on the inflow-side and covering the inflow end face, and an outflow-side area that is an area other than the inflow-side area, and the inflow-side area is made of a material having electric resistivity lower than electric resistivity of a material of the outflow-side area.
摘要:
Provided is a method for producing a silicon carbide ceramic easily and simply producing a silicon carbide ceramic having a small amount in resistivity change due to temperature change and being capable of generating heat by current application; and having a forming raw material preparing step of mixing two or more kinds of silicon carbide ceramic powders containing 4H—SiC silicon carbide crystals at respectively different content ratio to prepare a forming raw material; a forming step of forming the forming raw material into a formed body; and a firing step of firing the formed body to produce a silicon carbide ceramic being adjusted at a content ratio of 4H—SiC silicon carbide crystal to a desired value.
摘要:
A honeycomb structure including: a tubular honeycomb structure part having porous partition walls with which a plurality of cells are formed, and an outer peripheral wall; and a pair of electrode parts arranged on a side surface of the honeycomb structure part, an electrical resistivity of the honeycomb structure part is from 1 to 200 Ωcm, each of the pair of electrode parts is formed into a band-like shape extending in a direction in which the cells extend, in a cross section perpendicular to the extending direction of the cells, the one electrode part is disposed opposite to the other electrode part via the center of the honeycomb structure part, and a total of heat capacities of the pair of electrode parts is from 2 to 150% of a heat capacity of the whole outer peripheral wall.
摘要:
A honeycomb structure including a tubular honeycomb structure portion having: porous partition walls with which a plurality of cells extending from one end surface to the other end surface are formed to partition through channels of a fluid; and an outer peripheral wall positioned on an outermost periphery, an electrical resistivity of the partition walls is from 1 to 200 Ωcm, at least a part of the outer peripheral wall is formed by a low Young's modulus portion configured to have a Young's modulus lower than that of the partition walls, and a ratio of the Young's modulus of the low Young's modulus portion to the Young's modulus of the partition walls is from 2 to 95%. Provided is a honeycomb structure which is a catalyst carrier and also functions as a heater when a voltage is applied thereto and which has an excellent heat shock resistance.
摘要:
A silicon carbide ceramic is provided which has a small amount of resistivity change due to changes in temperature and which is capable of generating heat by current application. The silicon carbide ceramic contains silicon carbide crystals having 0.1 to 25 mass % of 4H—SiC silicon carbide crystals and 50 to 99.9 mass % of 6H—SiC silicon carbide crystals, preferably having a nitrogen content of 0.01 mass % or less, more preferably containing two or more kinds of silicon carbide particles containing silicon carbide crystals and silicon for binding the silicon carbide particles to each other and having a silicon content of from 10 to 40 mass %.