In order to investigate the influence of laminate periodicity on hardness and wearability

CrNx/TiyCr1-yN coatings with 5

13 and 26 periodic multilayer are prepared on AM355 steel substrate by metal evaporation vacuum arc ion source (MEVVA) and filter cathodic vacuum arc deposition technology. The morphology and phase structure of coatings are observed and analyzed by field emission scanning electron microscope (FESEM) and X-ray diffraction (XRD) respectively. The hardness of coating is tested by microhardness tester and the bond strength is measured by scratch tester. The results show that CrNx/TiyCr1-y coatings with multilayer have dense structure and good bond strength. With the increase of laminate periodicity

the hardness of multilayer decreases while the bond strength shows a trend of increasing at first and slowly lower later.