METALLIC CARRIER FOR CATALYST OF EXHAUST GAS OF AUTOMOBILE HAVING EXCELLENT DURABILITY

摘要

PURPOSE:To prevent projection phenomena of an inlet side by regulating the joining strength in the outlet side to 50% of the same in the inlet side when a metallic honeycomb body formed by overlapping and entangling a flat foil and a corrugated foil and a metallic outer cylinder which surrounds the side face of the metallic honeycomb body are joined. CONSTITUTION:The joining strength (length) in the axial direction of both a flat foil and a corrugated foil of a metallic honeycomb body in the outlet side of exhaust gas is regulated to <=50% of the joining strength (length) in the axial direction of the flat foil and the corrugated foil in the inlet side of exhaust gas. In other words, the projection phenomena of the honeycomb body are caused in the inlet side of exhaust gas. In order to prevent this, the joining strength of the honeycomb body in the outlet side is reduced and the honeycomb body is projected in the outlet side before the inlet side is projected. Thereby the projection phenomena of the honeycomb body in the inlet side are suppressed. Further instead of reducing the joining length, the joining places of the flat foil and the corrugated foil of the honeycomb body in the outlet side are reduced in comparison with the joining places in the inlet side. Thereby decrease in joining strength is achieved. Projection of the honeycomb body in the inlet side is prevented by this method and deterioration of the purification capacity of a catalyst is prevented. Thus, the possibilities of causing an engine trouble are eliminated.