| abstract |
The invention relates to a metal-ceramic substrate and to a method for the production thereof, said substrate comprising at least one ceramic layer (2) having a first and second surface side (2a, 2b), at least one of the surface sides (2a, 2b) of which is provided with metallisation (3, 4), wherein the ceramic material forming the ceramic layer (2) contains aluminium oxide, zirconium dioxide and yttrium oxide. The ceramic layer (2) particularly advantageously contains aluminium oxide, zirconium dioxide and yttrium oxide in the following proportions, in each case in relation to the total weight thereof: zirconium dioxide between 2 and 15 per cent by weight; yttrium oxide between 0.01 and 1 per cent by weight; and aluminium oxide between 84 and 97 per cent by weight, wherein the average grain size of the aluminium oxide used is between 2 and 8 micrometres and the ratio of the length of the grain boundaries of the aluminium oxide grains to the total length of all the grain boundaries is greater than 0.6. |