The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 15, 2008
Filed:
Jul. 08, 2004
Reto Kessler, Zurich, CH;
Felix Greuter, Rutihof, CH;
Michael Hagemeister, Zurich, CH;
ABB Research Ltd, Zurich, CH;
Abstract
The manufacturing method for an electroceramic component (), for example a varistor (), comprises a laser irradiation of a part () of the surface of an electroceramic body () before a metallization () is applied to the part () 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 () of the surface of the electroceramic body () 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 (). 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 () which adjoins the part () of the surface and which is not laser-irradiated. The laser beam can advantageously be pulsed and focused.