Ceramic honeycomb structure, ceramic honeycombs catalyst carrier, and from these existing ceramic honeycomb catalytic converter

摘要

PROBLEM TO BE SOLVED: To prevent cracks from being produced in the outer peripheral part of a ceramic honeycomb catalyst carrier to surely prevent the breakage of the ceramic honeycomb catalyst carrier by sticking a material having a thermal expansion coefficient almost equal to that of a catalyst to the whole surface outside the outer peripheral wall of a ceramic honeycomb structure before carrying the catalyst.;SOLUTION: In a catalytic converter for purifying harmful combustion gas discharged from an internal engine or the like, to the whole surface outside the outer peripheral wall of a ceramic honeycomb structure 10 before carrying a catalyst, a material 50 having a thermal expansion coefficient almost equal to that of the catalyst is stuck in advance. At this time, the stuck thickness (t) of the material 50 having the thermal expansion coefficient almost equal to that of the catalyst may be almost the same as that of the catalyst deposited on the partition inside the ceramic honeycomb catalyst carrier, but preferably, the thermal expansion coefficients inside and outside the outer peripheral wall of the ceramic honeycomb catalyst carrier are made almost equal. As the material having the thermal expansion coefficient almost equal to that of the catalyst, a material consisting essentially of γ-Al2O3, α-Al2O3 or the like is preferable.;COPYRIGHT: (C)2001,JPO