RESEARCH OF SELECTED PROPERTIES OF CR BASED COATINGS DEPOSITED ON HIGH SPEED STEEL BY PVD TECHNIQUE

Abstract

The paper deals with evaluation of selected properties of AlCrN and nACRo3 coatings deposited by PVD technique on specimens made of high speed steel CPM 10V produced by powder metallurgy. Tribological properties such friction coefficient (FC) and wear as well as mechanical properties such thickness and chemical composition of coatings, hardness and Young´s modulus were evaluated in the paper. These Cr based coatings were tested by Pin-on-disc test, Calotest, scanning electron microscope and EDX analysis. Maximal measured values of hardness of AlCrN and nACRo3 coatings were 31.02 GPa a 29.82 GPa, respectively. Adhesions of AlCrN and nACRo3 coatings obtained level HF2 (acceptable) and HF6 (not acceptable), respectively. Maximal values of Young´s modulus of AlCrN and nACRo3 coatings were 394.19 GPa and 308.15 GPa, respectively. FC of AlCrN and nACRo3 coatings were 0.44 and 0.84 at ball speed 5cm/s, and 0.20 and 0.54 at speed 10cm/s, respectively. Measured properties were compared with data observed by other authors and producer.