Patent ID: 8716635

Claim:
A honeycomb structure comprising: a cylindrical honeycomb structural portion having porous partition walls functioning as fluid passages and separating and forming a plurality of cells extending from one end face to the other end face and an outer peripheral wall located at the outermost periphery, and a pair of electrode portions disposed on the side face of the honeycomb structural portion; wherein the partition walls and the outer peripheral wall contain silicon carbide particles as a framework and silicon as a binder for binding the silicon carbide particles; wherein the honeycomb structure has a partition wall thickness of 50 to 200 μm, a cell density of 40 to 150 cells/cm 2 , and an average particle diameter of the silicon carbide particles as a framework of 3 to 40 μm; and wherein the honeycomb structural portion has a volume resistivity of 1 to 40 Ωcm at 400° C., and the volume resistivity of the electrode portion at 400° C. is not more than 40% of the volume resistivity of the honeycomb structural portion at 400° C.