Patent ID: 7811655

Claim:
A metal-ceramic substrate with at least one ceramic layer, with metallizations on both surface sides of the ceramic layer, wherein the metallizations are directly bonded with the ceramic layer by direct copper bonding and the metallizations have a thickness (d 2 ) between approximately 0.1-1.0 mm, the metal ceramic substrate having a partial discharge stability or resistance of less than 10 pC for a pre-defined measuring voltage (V 2 ), the thickness (d 1 ) of the ceramic layer and the measuring voltage (V 2 ) correspond to the formula V 2 ≦6.1 ×d 1 , or d 1 ≧1/6.1 ×V 2 where V 2 is specified in KV and d 1 in mm, wherein the bond of the respective metallization to the ceramic is greater than 95%, and wherein defective spots forming hollow spaces at a transition between the metallization and the ceramic layer do not exceed a diameter (d 3 ) of 50 μm and a height (h) of 50 μm.