Abstract: A silicon carbide porous body contains ?-SiC particles, Si particles, and metal silicide particles. The maximum particle diameter of the ?-SIC particles is not smaller than 15 ?m. The content of the Si particles is not lower than 10 mass %. The maximum particle diameter of the Si particles is not larger than 40 ?m. Further, an oxide coating film having a thickness not smaller than 0.01 ?m and not larger than 5 ?m is provided on surfaces of the Si particles.

Abstract: A composite sintered body contains a silicon phase which is a main phase, a cordierite phase, and an amorphous phase containing Si. Further, the volume resistivity thereof at a room temperature is not lower than 0.1 ?·cm and not higher than 2.5 ?·cm.

Abstract: A tubular member for an exhaust gas treatment device according to at least one embodiment of the present invention includes: a tubular main body made of a metal; and an insulating layer formed at least on an inner peripheral surface of the tubular main body. The insulating layer contains glass containing a crystalline substance, and the insulating layer has a porosity of from 1% to 12%.

Abstract: A composite sintered body contains a silicon phase, a cordierite phase, and a high-resistance silicon carbide phase. The content of silicon in the composite sintered body to the composite sintered body is not lower than 30 mass % and not higher than 50 mass %. The content of cordierite in the composite sintered body to the composite sintered body is not lower than 10 mass % and not higher than 50 mass %. The content of high-resistance silicon carbide in the composite sintered body to the composite sintered body is not lower than 20 mass % and not higher than 50 mass %.

Abstract: A composite sintered body contains a silicon phase and a cordierite phase. In the composite sintered body, I1/(I1+I2) is not smaller than 0.70 and not larger than 0.80, where I1 and I2 represent peak intensities of a (111) plane of silicon and a (110) plane of cordierite, respectively, which are obtained by the X-ray diffraction method. Further, in the composite sintered body, a median diameter of silicon particles, based on a volume standard, is not smaller than 9 ?m.

Abstract: A porous material includes aggregate particles and a binding material. In the aggregate particles, oxide films containing cristobalite are provided on surfaces of particle bodies that are silicon carbide particles or silicon nitride particles. The binding material binds the aggregate particles together in a state where pores are provided therein. The porous material contains at least one of copper, calcium, and nickel as an ancillary component.

Abstract: A thermal insulation member is directly or indirectly sandwiched between a first object and a second object and thereby suppresses or interrupts heat transfer between the first object and the second object. The thermal insulation member comprises: a first main surface opposed to the first object; and a second main surface positioned on the opposite side from the first main surface and opposed to the second object. The thermal insulation member has a porous structure of ceramic having pores. ZrO2 particles and different type material exist on surfaces of the ZrO2 particles form a skeleton of the porous structure. The different type material includes at least one selected out of SiO2, TiO2, La2O3, and Y2O3.

Abstract: A silicon carbide porous body contains ?-SiC particles, Si particles, and metal silicide particles. The maximum particle diameter of the ?-SIC particles is not smaller than 15 ?m. The content of the Si particles is not lower than 10 mass %. The maximum particle diameter of the Si particles is not larger than 40 ?m. Further, an oxide coating film having a thickness not smaller than 0.01 ?m and not larger than 5 ?m is provided on surfaces of the Si particles.

Abstract: A composite sintered body contains a silicon phase which is a main phase, a cordierite phase, and an amorphous phase containing Si. Further, the volume resistivity thereof at a room temperature is not lower than 0.1?·cm and not higher than 2.5?·cm.

Abstract: A tubular member for an exhaust gas treatment device according to at least one embodiment of the present invention includes: a tubular main body made of a metal; and an insulating layer formed at least on an inner peripheral surface of the tubular main body. The insulating layer contains glass containing a crystalline substance, and the insulating layer has a porosity of from 1% to 12%.

Abstract: A porous material includes an aggregate in which oxide films are formed on surfaces of particle bodies, and a binding material that contains cordierite and binds the aggregate together in a state where pores are formed. The binding material or the oxide films contain a rare-earth component that excludes Ce.

Abstract: A particulate filter, including: a pillar-shaped honeycomb structure portion having a plurality of first cells extending from a first end face to a second end face, the first end face being open and the second end face being plugged, and a plurality of second cells extending from the first end face to the second end face, the first end face being plugged and the second end face being open, in which the first cells and the second cells are alternately arranged adjacent to each other with porous partition walls interposed therebetween; and a low thermal conductive layer covering a part or the whole of an outer peripheral side surface of the pillar-shaped honeycomb structure portion, the thermal conductivity in a thickness direction of the low thermal conductive layer being 0.6 W/(m·K) or less.

Abstract: A sensor element comprises an element body and a porous protective layer covering a surface of the element body. In this sensor element, the porous protective layer comprises a first layer exposed on a surface of the sensor element and a second layer disposed between the element body and the first layer. The first layer contains ceramic particles and anisotropic ceramics having an aspect ratio of 5 or more and 100 or less, and a part of the first layer is in contact with the element body. Further, a porosity of the second layer is 95 vol % or more.

Abstract: A honeycomb structure has a plurality of cells formed by a plurality of partition walls. The partition walls are formed of a porous material composed predominantly of cordierite. Each partition wall includes surface layer portions having a porosity of 50% or more and an inside portion having a porosity of 50% or more, the surface layer portions being portions ranging respectively from opposite surfaces to a depth corresponding to 25% of the thickness of the partition wall, and the inside portion being the other portion. The surface layer portions and the inside portion both include pores having axial pore widths of less than 30 ?m and pores having axial pore widths of 30 ?m or more. A mean axial pore width in the surface layer portions is smaller than a mean axial pore width in the inside portion.

Abstract: A porous material includes an aggregate, and a binding material that binds the aggregate together in a state where pores are formed. The porous material contains 0.1 to 10.0 mass % of an MgO component, 0.5 to 25.0 mass % of an Al2O3 component, and 5.0 to 45.0 mass % of an SiO2 component with respect to the mass of the whole porous material, and further contains 0.01 to 5.5 mass % of an Sr component in terms of SrO.

Abstract: A joined body includes a junction target, an underlying layer, an electrode part, and a fixed layer. The conductive underlying layer is fixed on a surface of the junction target. The electrode part is fixed on the underlying layer. The conductive fixed layer is fixed on the underlying layer with the electrode part interposed therebetween. Respective porosities of the underlying layer and the fixed layer are each not higher than 10%.

Abstract: A porous material includes aggregate particles and a binding material. In the aggregate particles, oxide films containing cristobalite are provided on surfaces of particle bodies that are silicon carbide particles or silicon nitride particles. The binding material contains cordierite and binds the aggregate particles together in a state where pores are provided therein. The mass ratio of the cordierite to the whole of the porous material is in the range of 10 to 40 mass %. The oxide films that exist between the particle bodies and the binding material have a thickness less than or equal to 0.90 ?m.

Abstract: A heat dissipation member dissipates heat generated at a heat source. The heat dissipation member may include a substrate having a porosity ratio of 5 volume % or less; and an inorganic porous layer disposed on a surface of the substrate, wherein the inorganic porous layer may have a porosity ratio ranging from 25 volume % or more to 85 volume % or less and have lower thermal conductivity than the substrate. In this heat dissipation member, 15 mass % or more of constituents of the inorganic porous layer may be alumina.

Abstract: A gas sensor has a porous protective layer disposed on a surface of a sensor element. In this gas sensor, the porous protective layer includes ceramic particles and ceramic fibers. Further, the ceramic fibers are present in the porous protective layer over a range from a front surface to a back surface thereof.

Abstract: A composite member may include an inorganic porous layer on a surface of metal. The inorganic porous layer may include ceramic fibers. The inorganic porous layer may be constituted of 15 mass % or more of an alumina constituent and 45 mass % or more of a titania constituent.