FRACTURE TOUGHNESS DETERMINATION OF ARC-PVD AND HIPIMS (Al,Tl)N HARD COATINGS BY MICRO-CANTILEVER AND PILLAR SPLITTING TESTS

摘要

We performed small-scale in-situ fracture experiments in a scanning electron microscope (SEM) using micro-pillar splitting and micro-cantilever bending technique to determine the fracture toughness of five different arc-PVD and HiPIMS (AI,Ti)N hard coatings. All coatings showed brittle fracture with slightly different fracture toughness. In this talk, we discuss on the one hand side the observed differences in the fracture behavior, which are based on the coating microstructure, which depends on the deposition parameters and techniques. Furthermore we want to investigate as to how small-scale fracture techniques can be used as tool to provide necessary information on the lifetime of hard coatings as protection of cutting tools.