Elevated temperature tribological properties of AlTiN coating up to 700°C

Abstract

High Al content AlTiN were deposited on YG6 (WC+ 6 wt-%Co) cemented carbide by cathodic arc evaporation technique. The tribological properties were investigated up to 700°C at a high speed of 100 m min⁻¹. The results showed that the friction coefficient of the coating decreased with the increase of temperature apparently. The wear rate of room temperature was higher than that of 200 and 400°C, but showed ‘negative’ value at temperature over 500°C. The wear mechanism of the AlTiN coating at temperature less than 400°C was primary abrasive wear, while oxidation and adherence were suggested to be the main wear mechanisms at elevated temperature over 500°C. By comparison, adhesive wear was more predominant in the friction, the contribution of adhesive wear was more than that of abrasive wear at elevated temperatures.