Exhaust-gas treatment unit having high-temperature-resistant component of high-grade steel with a cobalt-containing coating and method for producing such an exhaust-gas treatment unit

摘要

A high-temperature-resistant component for an exhaust-gas treatment unit, an exhaust-gas treatment unit and a method for producing such a unit, include providing the component or the exhaust-gas treatment unit with a surface layer intended to prevent the formation of chromium carbide bridges during a brazing process for producing the exhaust-gas treatment unit.

主权项

1. An exhaust-gas treatment unit for an exhaust system, the exhaust-gas treatment unit comprising:
at least one component formed of a material containing at least iron, chromium and aluminum, said at least one component at least partially having a surface layer at least containing cobalt, said cobalt-containing surface layer preventing formation of carbides during high-temperature brazing processes; other components; other individual parts; brazed connecting points connecting said at least one component to itself or to said other individual parts; at least said component having a coating applied to said surface layer; an area of contact between said at least one component and said other components or said other individual parts, said area of contact having regions in which a brazed connection is not desired; and said surface layer covering at least said regions of said area of contact in which a brazed connection is not desired.