Katalytischer Konverter - metallische Folie und seine Anwendung, und Verfahren zu seiner Herstellung

摘要

A foil substrate material for use in catalytic converters is prepd. by: (a) providing a layer of a first material chosen from Cr-contg. ferrous metals and Al and its alloys; (b) sandwiching the first layer between layers of different Cr-contg. ferrous alloys or Al and its alloys; (c) metallurgically bonding the layers together by reducing the thickness to form a multilayer composite of the first and second materials; (d) reducing the composite to a final thickness and heating at 900-1200 0C for sufficient time to effect diffusion of the metallic components of the layers throughout the composite material, affording a uniform solid soln. material for the foil substrate. The thickness redn. is effected by pressure rolling without thermal treatment.