The Effect of Temperature on Wear Mechanism of the AlCrN Coated Components

Abstract

The aim of the paper was to investigate the temperature effect on the wear mechanism of AlCrN coated components. The coating was deposited by Physical Vapour Deposition process (PVD) on WC/Co substrate. Tribological tests were performed in sliding conditions using high temperature T‑21 tribotester, produced by ITeE-PIB Radom. The tests were performed in a ball-on-disc configuration (Si3N4 ceramic ball), under dry friction conditions at room temperature, 600°C and 750°C. An optical microscope, interferometer, and scanning electron microscope were used to analyse the worn surfaces. Following this study, it was found that wear resistance of the coating AlCrN tribosystem depended on the temperature. The biggest wear was reported at room temperature. At 600°C the intensity of wear of the coating was 4-fold lower, and at 750°C wear was 6-fold lower that at room temperature. High temperature wear resistance of AlCrN coating involves creating protective oxide layer. Performed analysis of structure the surface layer, showed a much higher content of oxygen in wear scar than outside. At high temperatures, friction additional intensified oxidation process thus the amount of oxygen in surface layer increased with temperature. Oxide layer, Al2O3 and Cr2O3 probably, created at high temperature was a barrier to further oxidation of the coating and had very high wear resistance at high temperature.

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

“…The detailed deposition process parameters are not provided by the coating supplier. The selected coating exhibits excellent tribological characteristics at temperatures up to 1100 °C [14]. The chemical composition of the coating, measured by X-ray microprobe EDS, is 36.9 ± 0.2 at% Al, 39.1 ± 0.2 at% Cr and 21.2 ± 0.3 at% N. The thickness of the coating is ca 1.2 µm.…”

Sliding Wear Performance of AlCrN Coating on TiB2/Ti Composites at High Temperatures

“…The discs made of various types of TiB 2 /Ti were coated using the commercial coating AlCrN-based (BALINIT ®® ALCRONA PRO made by Oerlikon Balzers, Polkowice, Poland) which exhibits excellent tribological characteristics at temperatures up to 1100 • C [28]. The deposition process parameters are not provided by the coating supplier.…”