Author(s) Kim, H.; Heo, S.; Kim, W.Ryeol; Kim, J.H.; Park, I.W.; Kim, K.Ho
Journal J Nanosci Nanotechnol
Date Published 2020 Jul 01

In recent year, vanadium-doped tribological films have become available as possible candidates for self-lubrication at high temperatures. In this work, quaternary Al-Cr-V-N films were deposited onto silicon wafer and WC-Co substrates by an unbalanced magnetron sputtering using high purity (99.99%) CrAl₂ and V targets with argon-nitrogen reactive gases. EPMA results revealed that vanadium atoms can incorporated from 0 to 13 at.% into the films. The maximum hardness value was ~32 GPa at vanadium content of 7.1 at.% in the Al-Cr-V-N films. The high-temperature tribometer was used to analysis the friction characteristics of the films with elevated temperature. As a result of the high temperature friction test after heating up to 700 °C, the average friction coefficient decreased from 0.62 to 0.35 with increasing of vanadium contents in the Al-Cr-V-N films. It is concluded that the reduction of the friction coefficient is attributed to the formation of V₂O, which is a Magnéli phase that acts as a lubrication at high temperature.

DOI 10.1166/jnn.2020.17606
ISSN 1533-4899
Citation J Nanosci Nanotechnol. 2020;20(7):42714275.