Abstract: A manufacturing method of a honeycomb structure includes a forming step of forming a quadrangular pillar-shaped honeycomb formed body, a firing step of firing the honeycomb formed body and forming a quadrangular pillar-shaped honeycomb fired body, a coating step of coating at least a part of side surfaces of the honeycomb fired body with a paste-like bonding material, a honeycomb block body preparing step of bonding the plurality of honeycomb fired bodies while performing pressurizing, to prepare a honeycomb block body, and a circumference grinding step of grinding a circumferential surface of the honeycomb block body and obtaining the honeycomb structure, and in the honeycomb block body preparing step, the bonding is performed without interposing any member other than the bonding material between the honeycomb fired bodies, and the bonding material has a shear thinning property.

Abstract: A breaking strength tester includes: a tubular pressure container having opened both ends to house a part of a pillar-shaped honeycomb structure including a partition walls and a circumferential wall; a tubular pressurization elastic body disposed to surround an entire circumference of a pressurized portion having a length equal to or less than ½ of a length in an axial direction of the circumferential wall; a partial pressurization unit which elastically deforms the pressurization elastic body and applies uniform pressure to the entire circumference of the circumferential wall of the pressurized portion of the honeycomb structure housed in the pressure container up to pressure test strength; and a pressure measurement unit which measures a value of the uniform pressure applied to the circumferential wall by the pressurization elastic body.

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.

Abstract: A breaking strength tester includes: a tubular pressure container having opened both ends to house a part of a pillar-shaped honeycomb structure including a partition walls and a circumferential wall; a tubular pressurization elastic body disposed to surround an entire circumference of a pressurized portion having a length equal to or less than ½ of a length in an axial direction of the circumferential wall; a partial pressurization unit which elastically deforms the pressurization elastic body and applies uniform pressure to the entire circumference of the circumferential wall of the pressurized portion of the honeycomb structure housed in the pressure container up to pressure test strength; and a pressure measurement unit which measures a value of the uniform pressure applied to the circumferential wall by the pressurization elastic body.

Abstract: A manufacturing method of a honeycomb structure includes a forming step of forming a quadrangular pillar-shaped honeycomb formed body, a firing step of firing the honeycomb formed body and forming a quadrangular pillar-shaped honeycomb fired body, a coating step of coating at least a part of side surfaces of the honeycomb fired body with a paste-like bonding material, a honeycomb block body preparing step of bonding the plurality of honeycomb fired bodies while performing pressurizing, to prepare a honeycomb block body, and a circumference grinding step of grinding a circumferential surface of the honeycomb block body and obtaining the honeycomb structure, and in the honeycomb block body preparing step, the bonding is performed without interposing any member other than the bonding material between the honeycomb fired bodies, and the bonding material has a shear thinning property.

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.

Abstract: The manufacturing method of the honeycomb structure has a forming step of forming a forming raw material into a plurality of quadrangular prismatic honeycomb formed bodies each having partition walls, a firing step of firing the plurality of honeycomb formed bodies to form a plurality of quadrangular prismatic honeycomb fired bodies, a sheet-like bonding material attaching step of attaching sheet-like bonding materials to at least part of side surfaces of at least part of the plurality of honeycomb fired bodies, a honeycomb block body preparing step of preparing a honeycomb block body in which the plurality of honeycomb fired bodies are stacked, by assembling the plurality of quadrangular prismatic honeycomb fired bodies while bonding the side surfaces thereof to one another by the bonding materials, and a grinding step of grinding a circumferential portion of the honeycomb block body to obtain the honeycomb structure.

Abstract: The manufacturing method of the honeycomb structure has a forming step of forming a forming raw material into a plurality of quadrangular prismatic honeycomb formed bodies each having partition walls, a firing step of firing the plurality of honeycomb formed bodies to form a plurality of quadrangular prismatic honeycomb fired bodies, a sheet-like bonding material attaching step of attaching sheet-like bonding materials to at least part of side surfaces of at least part of the plurality of honeycomb fired bodies, a honeycomb block body preparing step of preparing a honeycomb block body in which the plurality of honeycomb fired bodies are stacked, by assembling the plurality of quadrangular prismatic honeycomb fired bodies while bonding the side surfaces thereof to one another by the bonding materials, and a grinding step of grinding a circumferential portion of the honeycomb block body to obtain the honeycomb structure.