Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
617051 | Wear | 2015 | 13 Pages |
Abstract
In order to improve its poor tribological performance, an oxidation/diffusion coating on Ti-6Al-4V alloy was prepared by thermal oxidation and subsequent vacuum diffusion. The wear characteristics of the coating were explored on a pin-on-disc high temperature wear tester under 50-300 N at 25-600 °C. The oxidation/diffusion coating with a thickness of 250 μm was composed of TiO2, Ti2O and Ti2.5O3 and strongly bonded with substrate because of diffusion. The hardness distribution from the outmost coating to the substrate presented a gradient high-to-low variation; the hardness of the outmost coating reached 820-830 HV. The oxidation/diffusion coating represented extremely low wear losses under various conditions, especially at high loads and temperatures. The wear resistance of Ti-6Al-4V alloy was remarkably improved by the thermal oxidation and subsequent vacuum diffusion. Excellent wear resistance of the oxidation/diffusion coating was mainly attributed to the hard ceramic coating and the strong bond resulted from the thermal diffusion. However, at 600 °C and 300 N, the oxidation/diffusion coating started to present a failure tendency. In this case, the low wear losses seemed to result from the protective tribo-oxide layer. A predominant wear mechanism was suggested to be fatigue wear and transfer.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Colloid and Surface Chemistry
Authors
Y. Zhou, Q.Y. Zhang, J.Q. Liu, X.H. Cui, J.G. Mo, S.Q. Wang,