The present paper describes the new technology that combines the vacuum nitriding technology known in industry as NITROVAC'79 with following with PVD - arc coating the substrates of HSS steels by TiN. The details of both mentioned above processes are considered from a viewpoint of the combined, composite layer optimisation. Selected problems of TiN coating's adhesion as well as structural transformations of former vacuum nitrided layers during the PVD - arc process have been discussed on the base experimental data. The application range and advantages of new composite layers have been presented in the paper, too.
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