Abstract:
An inspection method for a pillar-shaped honeycomb filter having a honeycomb-shaped first end face and a honeycomb-shaped second end face, including: allowing gas containing fine particles to flow into the first end face; imaging the entire second end face covered with the sheet-like light using a camera while the gas that has flowed into the first end face flows out of the second end face through the filter, and generating an image of the entire second end face covered with the sheet-like light; selecting an inspection area of the second end face and measuring information concerning a sum of luminance of each pixel in the inspection area; and determining quality of the filter based on at least the information concerning the concentration of the fine particles in the gas before the gas flows into the first end face and the information concerning the sum of luminance.
Abstract:
To provide a technique related to a marking base that allows clear marking by ink and is excellent in thermal resistance and chemical resistance. A marking base composition contains inorganic particles of 27 to 50 mass %, an inorganic binder of 5 to 20 mass %, an organic binder of 3 to 16 mass %, a thermal expansion resin of 1 to 3 mass %, and an organic solvent.
Abstract:
A circumferential coating material contains colloidal silica, silicon carbide, and titanium oxide different in particle diameters from silicon carbide, coats a circumferential surface of a honeycomb structure monolithically formed by extrusion, including as a main component, cordierite having a porosity of 50 to 75%, and forms a circumferential coating layer. A circumferentially coated honeycomb structure has a honeycomb structure comprising latticed porous partition walls defining and forming a plurality of polygonal cells forming through channels and extending from one end face to the other end face, and a circumferential coating layer formed by coating at least a part of a circumferential surface of the honeycomb structure with the circumferential coating material.