Laser-irradiated metallized electroceramic
First Claim
1. A method for manufacturing an electroceramic component, a metallization being applied to at least one part of the surface of a sintered electroceramic body, comprising irradiating the at least one part of the surface with laser light before the metallization is applied thereby physically removing electroceramic material from the at least one part of the surface, wherein a focused laser beam is used as the laser light before the metallization is applied, the part of the surface is irradiated with the laser light in order to reduce a waviness of the part of the surface, and the laser beam is focused on an area which is arranged in parallel with an area which averages the waviness of the part of the surface.
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Accused Products
Abstract
The manufacturing method for an electroceramic component (1), for example a varistor (1), comprises a laser irradiation of a part (5; 6) of the surface of an electroceramic body (2) before a metallization (3; 4) is applied to the part (5; 6) of the surface. By means of the laser irradiation it is possible to produce a micro-roughness and/or a chemical modification of the surface which permits good adhesion of the metallization, and it is possible to reduce or eliminate areas of unevenness or waviness of that part (5; 6) of the surface of the electroceramic body (2) which is to be metallized. In addition, improved transverse conductivity can be produced, by virtue of which a low contact resistance and a very homogeneous current distribution is achieved, in particular near to the metallization (3; 4). In addition it is possible to remove residues which originate in particular from a sinter support or from the application of a passivation layer. After the laser irradiation, the electroceramic body advantageously has a border (9) which adjoins the part (5; 6) of the surface and which is not laser-irradiated. The laser beam can advantageously be pulsed and focused.
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Citations
31 Claims
- 1. A method for manufacturing an electroceramic component, a metallization being applied to at least one part of the surface of a sintered electroceramic body, comprising irradiating the at least one part of the surface with laser light before the metallization is applied thereby physically removing electroceramic material from the at least one part of the surface, wherein a focused laser beam is used as the laser light before the metallization is applied, the part of the surface is irradiated with the laser light in order to reduce a waviness of the part of the surface, and the laser beam is focused on an area which is arranged in parallel with an area which averages the waviness of the part of the surface.
- 15. A method for manufacturing an electroceramic component, a metallization being applied to at least one part of the surface of a sintered electroceramic body, comprising irradiating the at least one part of the surface with laser light before the metallization is applied thereby physically removing electroceramic material from the at least one part of the surface, wherein the electroceramic body has a particle structure, and in that loose particles and/or particle composites of the electroceramic body are found to be present on the part of the surface and/or particles and/or particle composites of the electroceramic body which are arranged in fissures in the particle structure are found to be present, the part of the surface being irradiated with laser light, before the application of the metallization, in order to remove such particles and/or particle composites.
- 20. A method for manufacturing an electroceramic component, a metallization being applied to at least one part of the surface of a sintered electroceramic body, comprising irradiating the at least one part of the surface with laser light before the metallization is applied thereby physically removing electroceramic material from the at least one part of the surface the electroceramic body being supported during the sintering by at least part of the surface on a sinter support, wherein, before the application of the metallization, the part of the surface is irradiated with laser light in order to remove parts of the sinter support which have remained in the part of the surface after the sintering.
- 25. A method for manufacturing an electroceramic component, a metallization being applied to at least one part of the surface of a sintered electroceramic body, comprising irradiating the at least one part of the surface with laser light before the metallization is applied thereby physically removing electroceramic material from the at least one part of the surface, the electroceramic body being provided, before the application of the metallization, at least partially with a nonconductive passivation layer, wherein, before the application of the metallization, the part of the surface is irradiated with laser light in order to remove parts of the passivation layer which are located on the part of the surface.
Specification