Nano-scale multi-layered coatings for improved efficiency of ceramic cutting tools

Abstract

This paper considers improving the efficiency of ceramic cutting tools using nano-scale multi-layered composite coatings deposited with an innovative arc-PVD processes with filtration of vapour-ion flow and diamond-like coating (DLC). Here a three-layered architecture of nano-structured multi-layered composite coatings is used, and the wear mechanism of the ceramic tool is examined. This approach allows implementing a direct control over the contact characteristics of the cutting process in order to reduce the normal and shear stresses that increase the probability of tool failure as a result of brittle fracture. This increases the adhesive strength of the coating with respect to the ceramic substrate. This resulted in an increase in tool life with reduced failure rate because of brittle fracture of the cutting edge.