Honeycomb structure and method for producing honeycomb structure

A honeycomb structure comprising a plurality of porous honeycomb block bodies bound via joining material layers A,

• wherein each of the porous honeycomb block bodies comprises a plurality of porous honeycomb segments bound via joining material layers B, each of the porous honeycomb segments comprising:
• partition walls that defines a plurality of cells to form flow paths for a fluid, each of the cells extending from an inflow end face that is an end face on a fluid inflow side to an outflow end face that is an end face on a fluid outflow side;
• and an outer peripheral wall located at the outermost periphery,
• wherein the joining material layers A are formed of the same material as that of the joining material layers B, and the joining material layers A comprises joining material layers with at least a part of them including a cutout portion,
• wherein the joining material layers (A) comprise joining material layers each having a width different from that of each of the joining material layers (B), and
• wherein the cutout portion is surrounded on all sides by the joining material layers (A).

A method for producing a honeycomb structure, the method comprising the steps of:

• binding a plurality of porous honeycomb segments via joining material layers B to form porous honeycomb block bodies, each of the porous honeycomb segments comprising:
• partition walls that defines a plurality of cells to form flow paths for a fluid, each of the cells extending from an inflow end face that is an end face on a fluid inflow side to an outflow end face that is an end face on a fluid outflow side;
• and an outer peripheral wall located at the outermost periphery;
• and
• binding the porous honeycomb block bodies via joining material layers A to produce a honeycomb structure,
• wherein the joining material layers (A) and the joining material layers (B) include alumina fibers, and the joining material layers (B) include a larger amount of alumina fibers than the joining material layers (A),
• wherein at least a part of the joining material layers A has a higher toughness than that of the joining material layers B, and
• wherein the joining material layers (A) comprise joining material layers each having a width different from that of each of the joining material layers (B).

A method for producing a honeycomb structure, the method comprising the steps of:

• binding a plurality of porous honeycomb segments via joining material layers B to form porous honeycomb block bodies, each of the porous honeycomb segments comprising:
• partition walls that defines a plurality of cells to form flow paths for a fluid, each of the cells extending from an inflow end face that is an end face on a fluid inflow side to an outflow end face that is an end face on a fluid outflow side;
• and an outer peripheral wall located at the outermost periphery;
• and
• binding the porous honeycomb block bodies via joining material layers A to produce a honeycomb structure,
• wherein the joining material layers A are formed of the same material as that of the joining material layers B, and the joining material layers A comprise joining material layers with at least a part of them having a cutout portion,
• wherein the joining material layers (A) comprise joining material layers each having a width different from that of each of the joining material layers (B), and
• wherein the cutout portion is surrounded on all sides by the joining material layers (A).