PRODUCTION OF METAL CARRIER FOR CATALYST DEVICE

摘要

PURPOSE: To provide a production method of a stable honeycomb body in which the depth of the part influenced by brazing is controlled to prevent cracks in the plate material due to thermal stress and to prevent decrease in the oxidation resistance of the plate material. CONSTITUTION: This metal carrier for a catalyst device is produced by forming flat plates and wavy plates from thin metal plates of a ferrite heat-resistant alloy containing Al and then melting a brazing material in a furnace to join the flat plates and wavy plates to form a honeycomb body having lots of mesh- like air passages. In this method, the plates in a high vacuum furnace are heated while the furnace temp. is maintained at the preheating temp. c1 which is lower by about 50 deg.C than the solid phase line temp. cm of a Ni-based brazing material for specified T1 preheating time so that the temp. in the furnace near the outside (shown as a solid line) coincides with the center temp. (broken line) at point P2 in the graph. Then furnace is further heated to join the plates at the specified joining temp. c3 for specified joining time T2 . The temp. c3 is determined to be higher than the solid phase line temp. cm of the brazing material and lower than the temp. cn which higher by 50 deg.C than the liquid phase line temp. The heating rate is >=6 deg.C/min and the cooling rate is >=1 deg.C/min.