Tribological Dependence of the High-Performance Ferrous-Based Coating on Different Coating Counterparts in Engine Oil |
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| Authors: | Yongxin Wang Bin Wang Jinlong Li Fuqiang Ma Qunji Xue |
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| Affiliation: | 1. Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, P.R. China;2. Zhejiang Electric Power Company Maintenance Branch, Ningbo, P.R. China |
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| Abstract: | A ferrous-based coating with significant chromium was fabricated on aluminum alloy substrate using a plasma spray technique. The tribological performance of the as-fabricated ferrous-based coating sliding against different coatings including Cr, CrN, TiN, and diamond-like carbon (DLC) in an engine oil environment were comparatively studied. Results showed that the high hardness of the sprayed ferrous-based coating was achieved due to the dispersion strengthening effect of Cr7C3 phase embedded in the austenite matrix. The ferrous-based coating exhibited low friction coefficients when coupled with these four coating counterparts, which could be attributed to the boundary lubricating effect of engine oil. However, both friction and wear of the ferrous-based coating were different when sliding against these different coating counterparts, which might be closely related to the surface roughness, self-lubricating effect, and mechanical properties of the coupled coatings. Ferrous-based coating sliding against CrN and DLC coatings exhibited good tribological performance in engine oil. The best coating counterpart for the ferrous-based coating in an engine was DLC coating. |
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| Keywords: | Plasma-sprayed ferrous-based coating tribological performance coating counterpart DLC coating engine oil |
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