The wear of PVD coated elements in oscillation motion at high temperature

Abstract

This paper provides an overview on the recent development of coatings and modified surfaces to minimize wear between contact surfaces in high-temperature working environments. The aim of this work was to study the wear of various types of coatings deposited by the PVD (Physical Vapour Deposition) method on TiB2/Ti composites manufactured by Spark Plasma Sintering (SPS). The following coatings were investigated: TiN-TiCrN-AlCrN-AlCrTiN/Si3N4-multilayer, TiN-TiCrN-AlCrN-AlCrTiN/Si3N4-AlCrTiSiN+grad ON, TiN-TiCrN-AlCrN-AlTiCrN and as a reference, a commercially available AlCrN-based coating – all intended to fulfil complex requirements of high-temperature working conditions. The wear tests were performed by means of a ball-on-disc SRV friction and wear tester using reciprocating motion of the Si3N4 ball sliding against a coated disc in a wide range of temperatures from room temperature up to 900 °C. The results confirmed that high-temperature wear resistance depends on the proper design of the coatings.