Metal foil connection, honeycomb body, metal foil brazing medium particle fraction for metal foils and method for manufacturing a metal foil connection
AssigneeEmitec Gesellschaft fur Emissionstechnologie mbH
InventorsLudwig Wieres, Ferdi Kurth, Helge Schlotmann
Life of this patent
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Abstract
A metal foil connection of first and second metal foils having a thickness of less than 0.05 mm includes a connecting point in which the metal foils are brazed to one another. The connecting point forms a wedge which is filled with brazing medium. A mass of the brazing medium, and a mass of sections of the metal foils which the brazing medium contacts in the wedge, have a given ratio. A honeycomb body, a brazing medium particle fraction and a method for manufacturing metal foil connections with a thickness of less than 50 micrometers, are also provided.
Claims42
A method for manufacturing a metal foil connection of first and second metal foils using a metal foil-brazing medium particle fraction, the method which comprises:
- providing the first and second metal foils with a thickness of between 10 and 25 μm;
- applying glue to the first and second metal foils;
- subsequently placing the metal foil-brazing medium particle fraction in contact with the first and second metal foils;
- brazing the first and second metal foils together at a connecting point forming a wedge;
- and
- providing the metal foil-brazing medium particle fraction with a maximum diameter of 0.08 mm and a minimum diameter of 0.02 mm for a metal foil thickness of substantially 0.02 mm.
A method for manufacturing a metal foil connection, which comprises:
- providing a first and a second metal foil having a thickness DF of between 10 and 25 μm;
- brazing the first and the second metal foils to one another at a connecting point forming a wedge;
- filling the wedge with brazing medium having a mass ML in the wedge;
- and
- setting a ratio ML/DF of the mass ML of the brazing medium in the wedge to the thickness DF of the metal foils to be substantially between 8 g/m and 16 g/m.
A method for manufacturing a metal foil connection, which comprises:
- providing a first and a second metal foil having a thickness DF of between 10 and 25 μm;
- brazing the first and the second metal foils to one another at a connecting point forming a wedge;
- filling the wedge with brazing medium having a mass ML in the wedge;
- and
- setting an upper limit of the mass ML of the brazing medium dependent on the metal foil thickness DF given by an intersection of coordinates for (ML/DF;
- DF) of (14.8 g/m;
- 0.025 mm), (16 g/m;
- 0.02 mm) and (27 g/m;
- 0.01 mm), with ML/DF being a ratio of the mass ML of the brazing medium in the wedge to the thickness DF of the metal foils.
A method for manufacturing a metal foil connection, which comprises:
- providing a first and a second metal foil having a thickness DF of between 10 and 25 μm;
- brazing the first and the second metal foils to one another at a connecting point forming a wedge;
- filling the wedge with brazing medium having a mass ML in the wedge;
- and
- setting the mass ML of the brazing medium to be dependent on the metal foil thickness DF and to lie along an intersection of coordinates for (ML/DF;
- DF) of (11.2 g/m;
- 0.025 mm), (12 g/m;
- 0.02 mm) and (20 g/m;
- 0.01 mm), with ML/DF being a ratio of the mass ML of the brazing medium in the wedge to the thickness DF of the metal foils.
A method for manufacturing a body, which comprises:
- providing sheet metal layers formed of at least partly structured metal foils having a thickness DF of between 10 and 25 μm;
- at least partly brazing the sheet metal layers to one another at brazed connecting points each having a metal foil connection with two of the metal foils forming a wedge;
- filling the wedges with brazing medium having a mass ML in the wedges;
- and
- setting a ratio ML/DF of the mass ML of the brazing medium in each of the wedges to the thickness DF of the metal foils to be substantially between 11 g/m and 16 g/m.
A method for manufacturing a metal foil connection of first and second metal foils using a metal foil-brazing medium particle fraction, the method which comprises:
- providing the first and second metal foils with a thickness substantially between 20 μm and 25 μm;
- applying glue to the first and second metal foils;
- subsequently placing the metal foil-brazing medium particle fraction in contact with the first and second metal foils;
- brazing the first and second metal foils together at a connecting point forming a wedge;
- and
- selecting a minimum diameter and a maximum diameter of the metal foil-brazing medium particle fraction in dependence on the thickness of metal foils between lines 15 and 16 on the following graph:
- 1
- with the abscissa representing the foil thickness in μm and the ordinate representing the particle diameter in μm.
A method for manufacturing a metal foil connection of first and second metal foils using a metal foil-brazing medium particle fraction, the method which comprises:
- providing the first and second metal foils with a thickness substantially between 20 μm and 25 μm;
- applying glue to the first and second metal foils;
- subsequently placing the metal foil-brazing medium particle fraction in contact with the first and second metal foils;
- brazing the first and second metal foils together at a connecting point forming a wedge;
- and
- selecting a minimum diameter and a maximum diameter of the metal foil-brazing medium particle fraction in dependence on the thickness of metal foils between lines 17 and 18 on the following graph:
- 2
- with the abscissa representing the foil thickness in μm and the ordinate representing the particle diameter in μm.
A method for manufacturing a metal foil connection of first and second metal foils using a metal foil-brazing medium particle fraction, the method which comprises:
- providing the first and second metal foils with a thickness DF substantially between 20 μm and 25 μm;
- applying glue to the first and second metal foils;
- subsequently placing the metal foil-brazing medium particle fraction in contact with the first and second metal foils;
- brazing the first and second metal foils together at a connecting point forming a wedge;
- and
- selecting a minimum diameter MinPD and a maximum diameter MaxPD of the metal foil-brazing medium particle fraction in μm in dependence on the thickness DF of metal foils in μm from the following table:
- 1 DF MinPD MaxPD approx. 20 approx. 30 approx. 70 approx. 25 approx. 30 approx. 74
- and values located therebetween.
A method for manufacturing a metal foil connection of first and second metal foils using a metal foil-brazing medium particle fraction, the method which comprises:
- providing the first and second metal foils with a thickness DF substantially between 20 μm and 25 μm;
- applying glue to the first and second metal foils;
- subsequently placing the metal foil-brazing medium particle fraction in contact with the first and second metal foils;
- brazing the first and second metal foils together at a connecting point forming a wedge;
- and
- selecting a minimum diameter MinPD and a maximum diameter MaxPD of the metal foil-brazing medium particle fraction in μm in dependence on the thickness DF of metal foils in μm from the following table:
- 2 DF MinPD MaxPD approx. 20 approx. 35 approx. 61 approx. 25 approx. 35 approx. 68
- and values located therebetween.
A method for manufacturing an exhaust gas body made of thin metal foil, comprising:
- a step of forming a honeycomb body in which 10˜25 μm thick corrugated metal foil and flat metal foil are joined by brazed joints using a brazing powder;
- the brazing powder having a particle diameter not greater than 4 times the thickness of the metal foil constituting the honeycomb body.
Dependencies are inferred from the claim text.