INFLUENCE n-TiC/α-C WEAR-RESISTANT COATINGS ON THE PERFORMANCE OF THE CBN TOOLS

Abstract

To optimize the processing conditions, it is necessary to create opportunities for the cutting temperature controlling, because for each pair of tools – detail materials there is an optimal value of this parameter. Machining with conditions that match the optimal cutting temperature ensures maximum tool life. The practical solution of the problem is possible through the use of wear-resistant coatings. The presence of protective coatings at the contact surfaces of the instrument leads to the changes in mechanical, physical and chemical contact interaction between tool and the work piece. The nanocomposite coating, representing a new generation of materials, based on n-TiC/α-C was used at this paper. They consist of at least two phases of nanocrystalline and amorphous structure and have lower mechanical properties (hardness and elastic modulus) than the base material. The results of experimental researches showed that using the tools with such coatings reduces the average cutting temperature. It is due to the fact that the coating reduces the adhesion interaction between tool and working material leading to the friction declination.