Abstract
In the present paper the basic mechanical properties of PVD hard coatings, which are currently used in Končar Alati company for wear protection of forming tools manufactured on request of the Electrolux Group, with emphasis on the Electrolux Home Products company, Denmark A/S, have been compared. This company has high demands on tool performance for machining and forming of several different workpiece materials, such as sheet steel, stainless steel, aluminium and Teflon coated sheet. Two different deposition methods were used for preparation of hard coatings: sputtering using unballanced magnetron sources – CC800 (CemeCon) and cathode arc evaporation [BAI 1200 (Balzers)]. The coatings for test were deposited on four different tool steels. It was found that the hard coatings investigated in the present work showed a wide range of mechanical properties: microhardness in the range of 900–3200 HV, critical load for total delamination in the range of 75–135 N, indentation modulus in the range of 120–390 GPa and the scratching coefficient in the range of 0·02–0·09.
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