Patent ID: 8342384

Claim:
A process for producing a metal-ceramic substrate comprising a ceramic layer and a structured metal layer forming conductive tracks and contact surfaces on at least one surface side of the ceramic layer, and at least one brazing resist coating applied to the structured metal layer, the process comprising: a) applying at least one metal foil to the at least one surface side of the ceramic layer by high temperature bonding at a bonding process temperature higher than 650° C. for forming at least one metal layer on the ceramic layer, b) structuring the at least one metal layer to form the structured metal layer on the at least one surface side of the ceramic layer by applying a mask of a photo resist or edging resist to a surface side of the structured metal layer opposite to the ceramic layer and by subsequent edging away areas of the structured metal layer which are not covered by the mask of the photo resist or edging resist for forming the conductive tracks and contact surfaces of the structured metal layer to form a completely finished structural metal layer, c) removing the mask of photo resist or edging resists with a material and applying the at least one brazing resist coating to the completely finished structured metal layer, the at least one brazing resist coating having a thickness between 0.5 and 100 microns and being resistant to the material used for the removing the mask, d) after applying the at least one brazing resist coating to the completely finished structured metal layer, cleaning the completely finished structural layer by removing metal from the completely finished structured metal layer in an amount of 0.1-20 microns at least in surface areas of the structured metal layer bordering the at least one brazing resist, and e) leaving the at least one brazing resist coating on the completely finished structured metal layer of the completely finished metal-ceramic substrate.