Process for the production of a brazed honeycomb body using sheets of a layer-like configuration
First Claim
1. A process for producing a catalyst carrier honeycomb body for an exhaust gas system, which comprises:
- initially forming structured sheet metal layers to obtain passages through which a fluid is able to flow, the structured sheet metal layers comprising a layered material having at least one chromium-containing steel layer and at least one layer containing aluminum;
subsequently substantially homogenizing the chromium-containing steel and aluminum-containing layers in a heat treatment initially under one of vacuum and a reducing atmosphere, subsequently or simultaneously subjecting the sheet metal layers to a brazing procedure in said atmosphere, and then subjecting the sheet metal layers to an oxidizing atmosphere;
the brazing procedure comprising at least partially brazing together contact locations between the structured sheet metal layers with a brazing material based on nickel and containing between 0.5 and 8% by weight of boron; and
at least one of stacking and winding the structured sheet metal layers to form passages for conducting a fluid flow.
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Accused Products
Abstract
A process for the production of a brazed honeycomb body with sheets having a layer-like configuration, includes stacking and/or winding sheet metal layers at least partially having a structure for forming passages through which a fluid can flow. At least a portion of the sheet metal layers is initially formed of a layered material having at least one layer of chromium-containing steel and at least one substantially aluminum-containing layer. The aluminum-containing layer is substantially homogenized in a later heat treatment and the heat treatment is effected firstly under a vacuum or in a reducing and then an oxidizing atmosphere. The heat treatment is part of a brazing procedure in which contact locations between the sheet metal layers are brazed together at least in partial regions by the addition of brazing material.
9 Citations
6 Claims
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1. A process for producing a catalyst carrier honeycomb body for an exhaust gas system, which comprises:
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initially forming structured sheet metal layers to obtain passages through which a fluid is able to flow, the structured sheet metal layers comprising a layered material having at least one chromium-containing steel layer and at least one layer containing aluminum; subsequently substantially homogenizing the chromium-containing steel and aluminum-containing layers in a heat treatment initially under one of vacuum and a reducing atmosphere, subsequently or simultaneously subjecting the sheet metal layers to a brazing procedure in said atmosphere, and then subjecting the sheet metal layers to an oxidizing atmosphere; the brazing procedure comprising at least partially brazing together contact locations between the structured sheet metal layers with a brazing material based on nickel and containing between 0.5 and 8% by weight of boron; and at least one of stacking and winding the structured sheet metal layers to form passages for conducting a fluid flow. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification