| GONG Xiao-hong,CAI Li-xin,SU Yong-yao,YU Wei-jie,MA Yu-cheng.Effect of Deposition Bias Voltage on Structure of MoN Coating and Tribological Properties in Diesel[J],52(7):158-166 |
| Effect of Deposition Bias Voltage on Structure of MoN Coating and Tribological Properties in Diesel |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.07.013 |
| KeyWord:magnetron sputtering MoN coating bias voltage friction and wear diesel |
| Author | Institution |
| GONG Xiao-hong |
College of Materials Science and Engineering, Chongqing University of Technology, Chongqing , China;College of Materials Science and Engineering, Chongqing University of Arts and Sciences, Chongqing , China |
| CAI Li-xin |
College of Materials Science and Engineering, Chongqing University of Technology, Chongqing , China;College of Materials Science and Engineering, Chongqing University of Arts and Sciences, Chongqing , China |
| SU Yong-yao |
College of Materials Science and Engineering, Chongqing University, Chongqing , China;College of Materials Science and Engineering, Chongqing University of Arts and Sciences, Chongqing , China |
| YU Wei-jie |
School of Intelligent Manufacturing and Transportation, Chongqing Vocational Institute of Engineering, Chongqing , China |
| MA Yu-cheng |
College of Materials Science and Engineering, Chongqing University of Technology, Chongqing , China |
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| Abstract: |
| This article aims to investigate the effects of deposition bias voltage on the microstructure of MoN coatings and its tribological behavior in diesel. MoN coatings were deposited through magnetron sputtering on the 304 stainless substrate by adjusting the deposition bias voltage (−50-−200 V). The crystal structure, elementary composition, surface roughness, hardness, film-substrate bonding force, internal stress, corrosion resistance, and other properties of MoN coatings were detected by an X-Ray diffractometer, an X-ray photoelectron spectroscopy, an X-ray energy spectrometer, an atomic force microscopy, a nanoindenter, a film stress testing apparatus, and an electrochemical workstation. The tribological behavior of MoN coatings in 0# diesel was detected by a tribometer in ball-on-disk type, and the morphology of the worn surface of MoN coatings was examined on a Laser Raman spectrometer and an SEM. According to the results, the phase structure of MoN coatings was B1-MoN when the bias voltage was −50 V. When the bias voltage was increased to −80 V, the phase structure of MoN coatings changed from B1-MoN to γ-Mo2N. When the bias voltage was further increased to −200 V, the phase structure of these coatings was found to remain the same. With the increase of the deposition bias voltage, the ion sputtering effect was enhanced, the Mo content increased and the N content decreased, the surface roughness, nano-hardness and internal stress of the films first decreased and then increased, and the thickness of the coatings and the film-substrate bonding force first increased and then decreased. When the deposition bias voltage was −50 V, the deposited MoN coating had a loose structure, rough surface, low hardness (14.96 GPa), high internal stress, poor film-substrate bonding and poor corrosion resistance. When the deposition bias voltage was higher than −80 V, increasing the deposition bias voltage was accompanied by increasing the structural compactness of the coating. The surface roughness decreased from 8.38 nm to 7.78 nm and then increased to 8.59 nm. The hardness was high (18.02 GPa) and the binding force of film and substrate was high (253 mN). The internal stress increased from 0.13 GPa to 0.29 GPa. The nano-hardness increased from 14.72 GPa to 19.55 GPa. The film-substrate adhesion decreased from 263 mN to 241 mN. The tribological behavior of the MoN coating in diesel was tested and found that when the bias voltage was −50 V, the coating peeled off during the test and the friction coefficient and wear rate showed high values of 0.16 and 5.48× 10−6 mm3/(N.m), respectively. At a bias voltage of −120 V, the coating was found to have the best tribological behavior with a lower coefficient of friction and wear rate (0.1 and 1.8×10−7 mm3/(N∙m)). Furthermore, Raman and SEM analyses showed that the wear scars of the coatings were covered by carbon-based films. This was because, during the friction process, the diesel fuel was degraded into a carbon-based film due to the catalytic effect of MoN and friction, which served to protect the coating to reduce friction and wear. The structure and properties of MoN coating are affected by the bias voltage, while the γ-Mo2N coating has the best mechanical and tribological properties and high corrosion resistance. In diesel oil, friction catalysis makes diesel oil degrade to form a carbon-based film, which is beneficial to reduce the friction coefficient and wear rate of MoN coating. |
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