Honeycomb structure

A honeycomb structure, comprising:

• a plurality of pillar shaped honeycomb segments, each of the pillar shaped honeycomb segments comprising:
• a partition wall for defining a plurality of cells extending from a first end face to a second end face to form flow paths for a fluid;
• and a plugged portion that plugs predetermined opening end portions of the cells on the first end face side and remaining opening end portions of the cells on the second end face side;
• and
• a joining layer arranged so as to join side surfaces of the pillar shaped honeycomb segments to each other,
• wherein the partition wall contains silicon and silicon carbide and has an average thickness of from 0.152 to 0.254 mm;
• and
• wherein the honeycomb structure satisfies the following equations (1) to (3):
• y≤1000 (1);
• y≤717.92x−0.095 (2);
• and
• y≥462.4x−0.153 (3),
• in which y is a maximum temperature (° C.) at which the use of the honeycomb structure is accepted, and x is a thermal conduction factor represented by the following equation:
• thermal conduction factor=(thermal conductivity of the partition wall×thermal conductivity of the joining layer)/(average thickness of the joining layer×porosity of the partition wall).