Abstract: There is disclosed a honeycomb structure. A honeycomb structure includes a pillar-shaped honeycomb structure body having partition walls defining a plurality of cells which become through channels for a fluid and extend from a first end face to a second end face, the partition walls are constituted of a porous body having aggregates and a bonding material to bond the aggregates to one another in a state where pores are formed among the aggregates, the aggregates include molten silica particles, the bonding material includes glass, a content ratio of SiO2 in the porous body is 70 mass % or more, and a thermal expansion coefficient of the porous body at 40 to 800° C. is from 1.5 to 6.0×10?6/° C.

Abstract: There is disclosed a honeycomb structure. A honeycomb structure includes a pillar-shaped honeycomb structure body having partition walls defining a plurality of cells which become through channels for a fluid and extend from a first end face to a second end face, the partition walls are constituted of a porous body having aggregates and a bonding material to bond the aggregates to one another in a state where pores are formed among the aggregates, the aggregates include molten silica particles, the bonding material includes glass, a content ratio of SiO2 in the porous body is 70 mass % or more, and a thermal expansion coefficient of the porous body at 40 to 800° C. is from 1.5 to 6.0×10?6/° C.

Abstract: There is disclosed a honeycomb structure. A honeycomb structure includes a pillar-shaped honeycomb structure body having partition walls defining a plurality of cells which become through channels for a fluid and extend from a first end face to a second end face, the partition walls are constituted of a porous body having aggregates and a bonding material to bond the aggregates to one another in a state where pores are formed among the aggregates, the aggregates include molten silica particles, the bonding material includes glass, a content ratio of SiO2 in the porous body is 70 mass % or more, and a thermal expansion coefficient of the porous body at 40 to 800° C. is from 1.5 to 6.0×10?6/° C.

Abstract: There is provide a honeycomb filter which can suppress generation of cracks in plugged portions due to heat generated by burning of a PM during regeneration and comprises a honeycomb basal body including porous partition walls arranged to form a plurality of cells disposed in parallel with one another and including inflow cells and outflow cells which are formed adjacent to the inflow cells; first plugged portions with which one end of each of the inflow cells is plugged; second plugged portions with which another end of each of the outflow cells is plugged; porous collecting layers formed on the inflow-cells side surfaces of the partition walls; and end aggregate layers made of a particulate aggregate material and formed on the inflow-cells-side surfaces of the first plugged portions, and a thickness of the end aggregate layers is from 0.5 to 5 mm.

Abstract: A honeycomb structure 1 includes: a periphery-ground article obtained by grinding an outer peripheral portion of a cell structure 3 where a plurality of honeycomb segments 11 are bonded by means of a bonding layer 12 at an outer wall 10 of each of them, and an outer peripheral coat layer 9 disposed on an outer peripheral face 8 of the periphery-ground article; wherein at least one of the bonding layer 12 and the outer peripheral coat layer 9 is formed by the use of honeycomb-forming slurry containing: biologically soluble fibers containing a metal oxide capable of extricating a metal ion, an inorganic binder containing a colloidal oxide having silica sol, and a chelate compound capable of multi-coordinating with the metal ion or an additive containing a first buffer solution or acid.

Abstract: A honeycomb structure includes: a periphery-ground article obtained by grinding an outer peripheral portion of a cell structure 3 where honeycomb segments 11 are bonded by a bonding layer 12 at an outer wall 10 of each of them, and an outer peripheral coat layer 9 disposed on an outer peripheral face 8 of the periphery-ground article; wherein at least one of the bonding layer 12 and the outer peripheral coat layer 9 is formed using honeycomb-forming slurry containing biologically soluble fibers containing a metal oxide capable of extricating a metal ion and an inorganic binder containing a colloidal oxide having modified silica sol manufactured by adding a substance containing amine or an aqueous solution of a water-soluble metalate of an amphoteric metal to silica sol. Crack generation of the outer peripheral coat layer and/or deterioration of bonding strength of the bonding layer can be inhibited.

Abstract: A method for manufacturing a plugged honeycomb structure including a step of mixing ceramic particles with a gas on one end face side of the plugged honeycomb structure, and a step of sucking the gas containing the ceramic particles from the other end face side of the plugged honeycomb structure to send the ceramic particles mixed in the gas into cells of the plugged honeycomb structure to allow the ceramic particles to adhere to surfaces in the cells of the plugged honeycomb structure.

Abstract: There is disclosed a honeycomb structure having a plurality of segments and each including a plurality of cells, wherein each segment has a porous base material having the honeycomb shape, and a modified portion formed by impregnating a part of the base material with a slurry including particles smaller than the average pore diameter of the base material, followed by a heat treatment, the base material has a porosity of 30 to 80% and an average pore diameter of 5 to 40 ?m, and the modified portion is partially formed on the section of the segment vertical (orthogonal) to the axial direction of the cells, and has a porosity which is 2 to 20% lower than that of the base material and an average pore diameter which is 0.1 to 10 ?m smaller than that of the base material.

Abstract: A bonding material for a honeycomb structure comprises inorganic particles in which D90/D10 is from 10 to 500, D10 is 100 ?m or less and D90 is 4 ?m or more, and the D10 and D90 are the values of 10% diameter and 90% diameter from a smaller particle diameter side, respectively, in volume-based integrated fractions of a particle diameter distribution measurement by a laser diffraction/scattering method.

Abstract: A method for manufacturing a plugged honeycomb structure includes: a step of mixing ceramic particles with a gas on one end face side of the plugged honeycomb structure, and a step of sucking the gas containing the ceramic particles from the other end face side of the plugged honeycomb structure to send the ceramic particles mixed in the gas into cells of the plugged honeycomb structure to allow the ceramic particles to adhere to surfaces in the cells of the plugged honeycomb structure.

Abstract: There is provide a honeycomb filter which can suppress generation of cracks in plugged portions due to heat generated by burning of a PM during regeneration and comprises a honeycomb basal body including porous partition walls arranged to form a plurality of cells disposed in parallel with one another and including inflow cells and outflow cells which are formed adjacent to the inflow cells; first plugged portions with which one end of each of the inflow cells is plugged; second plugged portions with which another end of each of the outflow cells is plugged; porous collecting layers formed on the inflow-cells side surfaces of the partition walls; and end aggregate layers made of a particulate aggregate material and formed on the inflow-cells-side surfaces of the first plugged portions, and a thickness of the end aggregate layers is from 0.5 to 5 mm.

Abstract: A bonding material for a honeycomb structure comprises inorganic particles in which D90/D10 is from 10 to 500, D10 is 100 ?m or less and D90 is 4 ?m or more, and the D10 and D90 are the values of 10% diameter and 90% diameter from a smaller particle diameter side, respectively, in volume-based integrated fractions of a particle diameter distribution measurement by a laser diffraction/scattering method.

Abstract: There is disclosed a honeycomb structure having a plurality of segments and each including a plurality of cells, wherein each segment has a porous base material having the honeycomb shape, and a modified portion formed by impregnating a part of the base material with a slurry including particles smaller than the average pore diameter of the base material, followed by a heat treatment, the base material has a porosity of 30 to 80% and an average pore diameter of 5 to 40 ?m, and the modified portion is partially formed on the section of the segment vertical to the axial direction of the cells, and has a porosity which is 2 to 20% lower than that of the base material and an average pore diameter which is 0.1 to 10 ?m smaller than that of the base material.

Abstract: A honeycomb structure includes: a periphery-ground article obtained by grinding an outer peripheral portion of a cell structure 3 where honeycomb segments 11 are bonded by a bonding layer 12 at an outer wall 10 of each of them, and an outer peripheral coat layer 9 disposed on an outer peripheral face 8 of the periphery-ground article; wherein at least one of the bonding layer 12 and the outer peripheral coat layer 9 is formed using honeycomb-forming slurry containing biologically soluble fibers containing a metal oxide capable of extricating a metal ion and an inorganic binder containing a colloidal oxide having modified silica sol manufactured by adding a substance containing amine or an aqueous solution of a water-soluble metalate of an amphoteric metal to silica sol. Crack generation of the outer peripheral coat layer and/or deterioration of bonding strength of the bonding layer can be inhibited.

Abstract: A honeycomb structure 1 includes: a periphery-ground article obtained by grinding an outer peripheral portion of a cell structure 3 where a plurality of honeycomb segments 11 are bonded by means of a bonding layer 12 at an outer wall 10 of each of them, and an outer peripheral coat layer 9 disposed on an outer peripheral face 8 of the periphery-ground article; wherein at least one of the bonding layer 12 and the outer peripheral coat layer 9 is formed by the use of honeycomb-forming slurry containing: biologically soluble fibers containing a metal oxide capable of extricating a metal ion, an inorganic binder containing a colloidal oxide having silica sol, and a chelate compound capable of multi-coordinating with the metal ion or an additive containing a first buffer solution or acid.