AUTOMOBILE EXHAUST GAS CLEANING CATALYST METAL CARRIER AND PRODUCTION METHOD THEREFOR

摘要

An automobile exhaust gas cleaning catalyst metal carrier superior in durability having a thermal fatigue resistance capable of withstanding high-temperature, high-speed exhaust gas flows and rapid heating and cooling and also superior in cleaning performance. The automobile exhaust gas cleaning catalyst metal carrier includes a metal honeycomb body formed by superposing a flat metal foil and a corrugated metal foil and spirally rolling them up, and a metal sleeve surrounding them, wherein the free flat foil used at the start of rolling up the metal foils and extending radially or chord-wise of the cylindrical hollow portion of the honeycomb body is subjected to such a treatment as being hollowed out for removal by axially machining or being pressed to extend along the innermost peripheral portion of the honeycomb body, the honeycomb body satisfying the relation, PHI B