| GONG Cong-yu,LIU Shan-bang,CAO Zhong-qing,NIE Yu-chen,CAI Zhen-bing.The Fretting Electrical Contact Performance of Graphene Oxide Films Prepared by Electrophoretic Deposition[J],50(8):227-236 |
| The Fretting Electrical Contact Performance of Graphene Oxide Films Prepared by Electrophoretic Deposition |
| Received:October 12, 2020 Revised:January 17, 2021 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2021.08.021 |
| KeyWord:graphene oxide film electrophoretic deposition fretting wear electrical contact surface roughness high temperature |
| Author | Institution |
| GONG Cong-yu |
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu , China |
| LIU Shan-bang |
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu , China |
| CAO Zhong-qing |
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu , China |
| NIE Yu-chen |
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu , China |
| CAI Zhen-bing |
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu , China |
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| Abstract: |
| The work aims to study the fretting electrical contact performance of graphene oxide films with different surface roughness. Copper was used as the substrate. Samples with different surface roughness were prepared using sandpaper of different particle sizes. Graphene oxide films were prepared on copper surfaces with different surface roughness by electrophoretic deposition. The fretting contact performance of graphene oxide films under different surface roughness conditions were studied by fretting electrical contact test device. The deposition of graphene oxide films was analyzed by Raman spectroscopy. White light interferometer, scanning electron microscope and energy dispersive spectrometer were used to observe the wear scar morphology, wear volume and composition. The electrical contact performance and wear mechanism of graphene oxide films under fretting were analyzed by combining the friction coefficient and electrical resistance. When the surface roughness was 1.51 μm and 1.27 μm, the D-peak and G-peak strengths of graphene oxide films were higher than those of other samples. At RT, the lowest contact resistance can be reduced to 10 mΩ and more stable. Compared with the untreated samples, the maximum reduction of coefficient of friction was 50%, from 0.46 to 0.23 (Ra=0.88 μm). The maximum reduction of wear volume was 90%, from 6.28×105 μm3 to 6.4×104 μm3 (Ra=1.27 μm)。At 100 ℃, the contact resistance was not more than 200 mΩ, the coefficient of friction increased to 0.51 and above, and the wear volume increased to 1.45×105 μm3 and above. Moreover, wear volumes with surface roughness of 1.51 μm and 1.27 μm were significantly lower than those with other two surface roughness. At 200 ℃, contact resistance finally exceeded 400 mΩ, with the coefficient of friction no less than 0.49 and wear volume increasing to 4.05×105 μm3 or above. The results show that the deposition effect of graphene oxide films is the best when the surface roughness is 1.51 μm and 1.27 μm. Graphene oxide films can significantly reduce contact resistance, coefficient of friction and wear volume. At high temperature, contact resistance and coefficient of friction increases and wear intensifies. |
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