Investigation on Elevated-Temperature Wear Resistance of Thermal Oxidation Coating on Ti-6Al-4V Alloy

Abstract

An oxidation coating on Ti-6Al-4V alloy was prepared by thermal oxidation and subsequent vacuum diffusion. The wear performance of the coating at elevated temperature was evaluated on a pin-on-disc high temperature wear tester under 50-300 N at 400°C. The results showed that the hardened coating with a thickness of 250 μm was produced on Ti-6Al-4V alloy. It was found that the elevated-temperature wear resistance of the coating was remarkably improved, compared with uncoated Ti-6Al-4V alloy. The oxidation coating on Ti-6Al-4V alloy presented extremely low wear losses. The excellent wear resistance of the coating could be attributed to high hardness of coating and its strong bond with substrate. Delamination wear was predominant wear mechanism during dry sliding at 400 °C.