One aspect generally relates to a composite, having a layer sequence. The layer sequence includes as layers a first layer, including a first ceramic, and first layer surface, a second layer, including a second ceramic, superimposing the first layer surface. The layer sequence includes a hole, connecting through each layer of the layer sequence； and a cermet. The cermet includes a first part and a second part. The first part is included by the hole. The second part is included between the first layer and the second layer. The cermet is in one piece.
