| GOU Hai-long,JIA Jun-hong,CHEN Ti-jun,YANG Jie,HE Nai-ru,CHEN Wei.Tribological Behaviors of Plasma Sprayed NiAl-V2O5/CuO Composite Coatings at Wide Temperature Range[J],51(4):112-120 |
| Tribological Behaviors of Plasma Sprayed NiAl-V2O5/CuO Composite Coatings at Wide Temperature Range |
| Received:February 05, 2021 Revised:August 19, 2021 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.04.010 |
| KeyWord:atmospheric plasma spraying oxide wide temperature range friction lubrication wear mechanism |
| Author | Institution |
| GOU Hai-long |
Co-constructing State Key Laboratory by Province of Advanced Processing and Recycling of Nonferrous Metal, Lanzhou University of Technology, Lanzhou , China;College of Mechanical & Electrical Engineering, Shaanxi University of Science & Technology, Xi’an , China |
| JIA Jun-hong |
College of Mechanical & Electrical Engineering, Shaanxi University of Science & Technology, Xi’an , China;State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou , China |
| CHEN Ti-jun |
Co-constructing State Key Laboratory by Province of Advanced Processing and Recycling of Nonferrous Metal, Lanzhou University of Technology, Lanzhou , China |
| YANG Jie |
College of Mechanical & Electrical Engineering, Shaanxi University of Science & Technology, Xi’an , China |
| HE Nai-ru |
College of Mechanical & Electrical Engineering, Shaanxi University of Science & Technology, Xi’an , China |
| CHEN Wei |
College of Mechanical & Electrical Engineering, Shaanxi University of Science & Technology, Xi’an , China |
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| Abstract: |
| This work aims to design and prepare NiAl based high temperature lubricating and wear-resistant coatings with good tribological properties in a wide temperature range using V2O5 and CuO as composite lubricating phases. The composite coatings with different mass ratios are fabricated by atmospheric plasma spraying technology (APS), and investigated tribological properties in a wide temperature range (RT~800 ℃); used SEM (scanning electron microscope), XRD (X-ray diffraction) and Raman (laser Raman scattering) to analyze the friction surface structure, phase change and wear mechanism of the coating in a wide temperature range. The composite coating is a typical plasma sprayed layered structure, and the oxide distribution is relatively uniform. With the increase of oxide content, the porosity of the coating increases; The composite coating has good lubrication performance in a wide temperature range. The friction coefficients of NiAl-10wt.% V2O5/CuO coating at room temperature and high temperature (800 ℃) are as low as 0.39 and 0.21 respectively. The wear rate increases with the increase of composite oxide content, but it is low at room temperature and high temperature. The wear rate of composite coating added with 10wt.% V2O5/CuO is 4.3×10‒5 mm3/(N∙m) and 5.1×10‒5 mm3/(N∙m) at room temperature and high temperature respectively. High temperature friction promotes the formation of ternary oxides Ni3V2O8, Cu3V2O8 and CuV2O6. These new phases form a lubricating layer on the wear surface with Cuo, V2O5 and NiO. The combination of V2O5/CuO significantly improved the tribological properties of the coating at room temperature and high temperature, but with the increase of oxide content, the mechanical properties of the coating decreased and the wear rate increased. The obvious improvement of the lubricating performance of the coating at high temperature is attributed to the ternary oxide high temperature lubricating film formed on the wear surface. |
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