Honeycomb body for an exhaust gas treatment unit
View Patent ↗A honeycomb body for an exhaust treatment unit has at least one honeycomb structure and a least one housing, which at least partially surrounds the at least one honeycomb structure. At least one region between the honeycomb structure and the housing is formed with a brazed joint and at least two separate measures delimit the brazed joint. Furthermore, a method for producing a corresponding honeycomb is also proposed.
1. A honeycomb body for an exhaust gas treatment unit, the honeycomb body comprising:
one honeycomb structure having a first end face and a second end face;
one housing at least partially surrounding said at least one honeycomb structure, said housing directly contacting said honeycomb structure at a contact surface;
a single brazed joint disposed on a region of said contact surface at said second end face of said honeycomb structure; and
a groove and a ceramic coating for delimiting said brazed joint, said groove and a ceramic coating being disposed between said first end face and said single brazed joint.
2. The honeycomb body according to claim 1 , wherein said honeycomb structure is formed with a plurality of at least partially structured metallic layers which have a material thickness being less than 60 μm.
3. The honeycomb body according to claim 1 , wherein:
said region is a circumferential region.
4. The honeycomb body according to claim 1 , wherein said groove has a depth in the range from 0.1 to 0.5 mm and a width in the range from 0.5 to 2.0 mm.
5. The honeycomb body according to claim 1 , wherein said ceramic coating is disposed at said first end face.
6. The honeycomb body according to claim 1 , wherein said ceramic coating is part of the honeycomb structure.
7. The honeycomb body according to claim 1 , wherein said ceramic coating is disposed in a vicinity of said groove.
8. A method for manufacturing a honeycomb body having one honeycomb structure having a first end face and a second end face and one housing at least partially surrounding the one honeycomb structure, which comprises the steps of:
directly contacting the housing with the honeycomb structure at a contact surface;
selecting at least one region for a single brazed joint disposed on the contact surface and at the second end face of the honeycomb structure;
selecting an insertion direction of the honeycomb structure into the housing;
providing the housing with a groove which when, viewed in the insertion direction, is positioned between the first end and the region for the brazed joint;
providing a ceramic coating for delimiting the brazed joint disposed between the first end and the region for the brazed joint;
applying brazing material to the region;
inserting the honeycomb structure into the housing; and
forming the brazed joint in the region.