HARD MATERIAL COATING OF A CEMENTED CARBIDE OR CARBIDE CONTAINING CERMET SUBSTRATE

摘要

The present invention relates to a component coated with a hard material, in particular diamond, for example a tool, to a process for its production and to a device for carrying out the process. In case of such a component the adhesion of the hard material layer often, in particular with fine-grained substrate materials, not satisfactory and it is an object of the invention to improve it. This is achieved by a process for the production of a component coated with a hard material, for example a tool, comprising the steps of: a) introducing a fine-grained cemented carbide or carbide-containing cermet substrate into a vacuum system with a heating device and at least one gas feed connection; b) removing carbon from the carbides of a surface layer of the substrate at a substrate temperature in the region of about 900 DEG C to about 1400 DEG C and in an oxygen-containing atmosphere; c) introducing carbon into the surface layer of the substrate at a substrate temperature in the region of about 900 DEG C to about 1400 DEG C and in a carbon-containing atmosphere; and d) coating the substrate with the hard material. The component itself as derived by this process and a device for carrying out the process are also subjects of the invention.