Abstract
Studies of structure and properties of TiN-Cu coatings with a wide interval of copper concentrations from 0,6 to 20 at. % have been carried out in- cluding its cutting action tests. The coatings were produced by the ion-plasma vacuum-arc deposition onto TT10K8B carbide cutting tool. Introduc- tion of copper into the composition of the coating results in nitride phase crystallite size reduction from 100 to 20 nm. In this case the hardness of coatings grows from 20 to 40 GPA while copper content in the coating increases up to 7–8 at. %. Further increase of copper content, which is accom- panied by nitride phase crystallite size reduction, is characterized by decrease of hardness down to 14–15 GPA concerned with the effect of soft duc- tile metal on it. The life tests of mechanical cutting by TiN-Cu coated 35KhGSA SMP steel show that the optimum composition of the coatings (TiN – 7–8 ат. % Cu) increases the durability of tools with replaceable polygonal inserts (SMP) more than 6 and 2,5 times compared with uncoated tool and TiN coated tool according to the basic technique respectively.
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