Catalytic converter comprising a holding and sealing material and corresponding manufacturing method

摘要

A holding and sealing material (1) for a catalytic converter is disposed between a cylindrical catalyst carrier (3) and a metal shell (2) covering the outer periphery of the catalyst carrier (3). The holding and sealing material (1) comprises a fiber aggregate mainly comprised of alumina-silica based ceramic fibers having a mullite crystal content of 10 wt% or less and an average diameter of 7 ¼m to 13¼m. The fiber aggregate is subjected to a needle punch treatment. Owing to the improved holding and sealing material, a catalytic converter having excellent durability and assemblage and having extremely low pollution characteristics is provided.