Coated metal substrate especially a hard metal with a wear protection layer consisting of high purity Al2O3 nanocrystals and containing residual pressure stresses useful in tool production

摘要

Coated metal substrate (1) especially a hard metal with a wear protection layer (2) with residual pressure stresses, where the wear resistant layer contains gradient-like element (3) from which the substrate or an intermediate layer (4) is obtained, with which the residual pressure stresses during layer deposition can be regulated (sic) by a wet chemical process directly in the wear protection layer. An independent claim is included for a method of producing the substrate involving wet chemical, combustion and sol-gel processes.