1-yTa yN single layer and Ti 1-xAl xN/Cr 1-yTa yN multilayer coatings]]>

摘要

AbstractCr1-yTayN single-layer and Ti1-xAlxN/Cr1-yTayN multilayer hard coatings were deposited on cemented carbide substrates using magnetron sputter deposition and cathodic arc evaporation. For the sputtered coatings a bias voltage of ?50V was applied, while arc evaporated coatings were deposited at three different bias voltages of ?40, ?60 and ?80V. The coatings were grown from powder metallurgically produced CrTa targets with a composition of 75at% Cr and 25at% Ta, resulting in a Cr/Ta ratio of 71/29 in the sputtered coatings and 74/26 in the arc evaporated coatings, independent of the applied bias voltage. All coatings are characterized by a single-phase face centered cubic structure. The sputtered single- and multilayer coatings exhibited a hardness of ~22.2 and ~25.2GPa, respectively. For the arc evaporated coatings, a hardness of ~22.7 could be determined for the multilayer, while for the single-layers the hardness increased from ~21.6 to ~24.3GPa with increasing bias voltage. Ball-on-disk tests against alumina at room temperature, 500 and 700°C yielded wear rates comparable to conventional Ti1-xAlxN coatings, but significantly lower friction coefficients. The performed cutting tests also showed promising results, indicating the high application potential of Cr1-xTaxN-based hard coatings.Graphical abstractDisplay OmittedHighlights?Cr1-xTaxN single- and Ti1-xAlxN/Cr1-xTaxN multilayers successfully deposited?Cr1-xTaxN single-layer coatings showed (001) oriented fcc structure.?Lower COF for single- and multilayers than for Ti1-xAlxN at elevated temperatures?50% longer lifetime of Ti1-xAlxN/Cr1-xTaxN in milling compared to Ti1-xAlxN]]>