Tribological Behavior of Cr Doped Diamond-like Carbon Coating in Engine Oil

doi:10.11901/1005.3093.2015.642

Chinese Journal of Materials Research

2017, Vol. 31

Issue (1): 18-26 DOI: 10.11901/1005.3093.2015.642

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Tribological Behavior of Cr Doped Diamond-like Carbon Coating in Engine Oil

Shaoxian ZHENG¹,Siming REN^1,³,Jibin PU^2,³(

)

1 School of Mechatronic Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
2 Key Laboratory of Marine Materials and Related Technologies, Key Laboratory of Marine Materials and Protective Technologies of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
3 State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China

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Shaoxian ZHENG,Siming REN,Jibin PU. Tribological Behavior of Cr Doped Diamond-like Carbon Coating in Engine Oil. Chinese Journal of Materials Research, 2017, 31(1): 18-26.

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Abstract

The tribological behavior of Cr doped diamond-like carbon coating (Cr-DLC) was investigated systematically in poly-alpha-olefin (PAO) oil at 180 °C (operating temperature of engine oil) with and without antiwear additive zinc dialkyldithiophosphate (ZDDP) for various applied loads. Then the worn surface was characterized by means of Energy dispersive X-ray spectroscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy. Results show that ZDDP-derived lubrication film can suppress the surface graphitization of Cr-DLC coating. In addition, the Cr-doping could increase the activity of friction surface to accelerate the tribochemical reaction between coating and ZDDP, which promoting the formation of lubrication film and the accumulation of antiwear products, therewith, improved tribological be havior of Cr-DLC coating in PAO with ZDDP additive.

Key words: surface and interface in the materials DLC ZDDP friction and wear lubrication film tribochemical reaction

Received: 11 November 2015

Fund: Supported by National Natural Science Foundation of China (No.51305433) and Zhejiang Provincial Natural Science Foundation (No.LZ17E050004)

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.642 OR https://www.cjmr.org/EN/Y2017/V31/I1/18

Table 1 Material properties used in FEM simulations

Fig.1 Cross-sectional and surface morphologies of the Cr-DLC coating

Fig.2 Contour plots of the von Mises stress for Cr-DLC coating under different applied loads

Fig.3 Friction curves for Cr-DLC coating under different applied loads

Fig.4 Wear rates of the Cr-DLC coating in PAO and PAO+ZDDP

Fig.5 SEM micrographs and cross-section profiles of wear tracks of Cr-DLC coating in PAO and PAO+ZDDP under an applied load of 100 N

Fig.6 SEM images of wear scar on the steel balls against Cr-DLC coating tested in PAO (a, b, c, d) and PAO+ZDDP (e, f, g, h) under different loads (a, e) 20 N; (b, f) 60 N; (c, g) 100 N; (d, h) 140 N

Fig.7 Elemental distribution maps of wear scar on the steel balls sliding against Cr-DLC coating in the PAO (a, b) and PAO+ZDDP (c, d) under different applied loads (a, c) 20 N; (b, d) 140 N

Fig.8 Raman spectra from as deposited coatings, within and outside wear tracks of Cr-DLC coating tested in PAO and PAO+ZDDP at a load of 100 N

Fig.9 XPS spectra of Cr 2p, Zn 2p, P 2p, S 2p and O1s peaks obtained from the tribofilms formed by the

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