That is, the coating system in accordance with the invention includes at least a hard layer of the composition SiaBbMecNuCvOw with a,b>0 and 33 at %>c???0 and u,v,w???0, wherein Me is a metal, in particular for example a metal being used for the production of the target such as Al in case of SiC or which metal can be a selective integrated metallic element.