COMPOSITE BODY AND PROCESS FOR ITS PRODUCTION

摘要

The invention relates to a composite body consisting of a hard metal, cermet, steel or ceramic substrate and at least one hard metal-carbo-nitride layer and a process for producing said hard carbo-nitride layer. According to the invention, the metal-carbo-nitride layer is obtained by a CVD or PCVD process, in which the metal of the metal-carbo-nitride layer consists of two or more elements from the IVa or VIa group of the periodic system. To produce said layer, either a carbon and nitrogen donor containing a -CN- molecular group is introduced into the CVD gas phase or a PCVD atmosphere is created which, besides hydrogen, argon, two or more different chlorides of the metals of the IVa to VIa groups of the periodic system, also contains ionised and/or non-ionised carbon-nitrogen donors with triple bonds.