Abstract: Provided is a porous material which is not easily damaged even when being exposed to a high temperature in a low oxygen atmosphere, and has heat resistance improved. A porous material includes aggregates formed of a nonoxide containing silicon and a binding material formed of an oxide ceramic binding the aggregates to each other while keeping a plurality of pores. The porous material has a phase containing oxygen on a surface of the aggregates including a boundary surface with the binding material. In the porous material, a content ratio of oxygen in the aggregates is preferably from 2 to 25% by mass relative to the mass of the aggregates.

Abstract: A honeycomb structure includes honeycomb segments each having a porous partition wall defining a plurality of cells, and includes a porous bonding layer containing a crystalline anisotropic ceramic and disposed so as to bond side surfaces of the honeycomb segments to each other. A ratio of a pore volume (cc/g) of a fine pore defined as a pore in the bonding layer having a pore diameter of 10 ?m or more and less than 50 ?m with respect to a pore volume (cc/g) of a coarse pore defined as a pore in the bonding layer having a pore diameter of 50 ?m or more and 300 ?m or less is from 2.0 to 3.5, the pore volume of the fine pore is from 0.15 to 0.4 cc/g, and the pore volume of the coarse pore is from 0.05 to 0.25 cc/g.

Abstract: A honeycomb structure includes honeycomb segments each having a porous partition wall defining a plurality of cells, and includes a porous bonding layer containing a crystalline anisotropic ceramic and disposed so as to bond side surfaces of the honeycomb segments to each other. A ratio of a pore volume (cc/g) of a fine pore defined as a pore in the bonding layer having a pore diameter of 10 ?m or more and less than 50 ?m with respect to a pore volume (cc/g) of a coarse pore defined as a pore in the bonding layer having a pore diameter of 50 ?m or more and 300 ?m or less is from 2.0 to 3.5, the pore volume of the fine pore is from 0.15 to 0.4 cc/g, and the pore volume of the coarse pore is from 0.05 to 0.25 cc/g.

Abstract: Provided is a porous material which is not easily damaged even when being exposed to a high temperature in a low oxygen atmosphere, and has heat resistance improved. A porous material includes aggregates formed of a nonoxide containing silicon and a binding material formed of an oxide ceramic binding the aggregates to each other while keeping a plurality of pores. The porous material has a phase containing oxygen on a surface of the aggregates including a boundary surface with the binding material. In the porous material, a content ratio of oxygen in the aggregates is preferably from 2 to 25% by mass relative to the mass of the aggregates.

Abstract: An ignition component 100 provided with a center electrode 30 and an insulator 32, in which the insulator 32 is formed of a large-diameter portion 33 and a small-diameter portion 34, the large-diameter portion 33 of the insulator 32 is inserted into the plug insertion hole 21 of the cylinder head 20 of the internal combustion engine, and a stepped portion 35 between the large-diameter portion 33 and the small-diameter portion 34 of the insulator 32 is pressed onto and fixed to the side of the cylinder head 20 of the internal combustion engine so that the insulator 32 is attached to the cylinder head 20 of the internal combustion engine is provided.