HONEYCOMB STRUCTURE

摘要

There is provided a honeycomb structure where a crack at a honeycomb substrate is reduced. A honeycomb structure has a honeycomb substrate that has a porous partition wall defining a plurality of cells extending from an inflow end face as one end face to an outflow end face as another end face and becoming channels for a fluid, and an outer circumference coating layer disposed at an outer circumference of the honeycomb substrate . At 25 to 800° C., a thermal expansion coefficient of the outer circumference coating layer is larger than a thermal expansion coefficient of the honeycomb substrate. The thermal expansion coefficients of the outer circumference coating layer and the thermal expansion coefficient at 25 to 800° C. preferably meet a relationship represented by the expression: 1.1<(the thermal expansion coefficient of the outer circumference coating layer/the thermal expansion coefficient of the honeycomb substrate)<40.

主权项

1. A honeycomb structure, comprising:
a honeycomb substrate that has a porous partition wall defining a plurality of cells, the cells extending from an inflow end face as one end face to an outflow end face as another end face and becoming channels for a fluid; and an outer circumference coating layer disposed on an outer circumference of the honeycomb substrate, wherein at 25 to 800° C., a thermal expansion coefficient of the outer circumference coating layer is larger than a thermal expansion coefficient of the honeycomb substrate.