| JIN Wei,LI Shu-yi,JING Zhao-gang,GUO Feng.Effect of Wettability of Solid/Liquid Interface on Film Lubrication in Line Contact[J],49(9):252-257 |
| Effect of Wettability of Solid/Liquid Interface on Film Lubrication in Line Contact |
| Received:December 12, 2019 Revised:September 20, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.09.028 |
| KeyWord:wettability fluid hydrodynamic lubrication line contact contact angle contact angle hysteresis slip |
| Author | Institution |
| JIN Wei |
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao , China |
| LI Shu-yi |
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao , China |
| JING Zhao-gang |
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao , China |
| GUO Feng |
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao , China |
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| Abstract: |
| The work aims to optimize the characterization parameters of solid/liquid interface. AF and FAS were used to modify the cylinder slider to obtain the surface with different wettability and contact angle, contact angle hysteresis and surface free energy were measured between engineering surfaces (AF, FAS and SiO2) and lubricating oil (PEG200, 150N and PAO6). The correlation between the wettability of the solid/liquid interface and the lubricant film thickness was evaluated by measuring the film thickness of line contact. With lubricating oil of PEG200 or 150N, the film thickness produced by SiO2/SiO2 contacts was higher than that of SiO2/FAS contacts. In this situation, the film thickness increased with the decrease of contact angle and the increase of contact angle hysteresis. The lubricating oil PEG200, 150N and PAO6 showed almost the same film thickness in the same contact pair SiO2/SiO2 or SiO2/AF, respectively. The correlation between contact angle hysteresis and film thickness was better than that between contact angle and film thickness. For AF coating, contact angle was the maximum, contact angle hysteresis was the minimum, but the lubricant film thickness was the maximum. This phenomenon could be attributed to the non-monotony of the bearing capacity/thickness of the lubricant film and the interface strength. Under the condition of line contact hydrodynamic lubrication, the wettability of solid/liquid interface can affect the thickness of oil film. The correlation between interface characterization parameters such as contact angle and contact angle hysteresis and film thickness is limited to some extent, but the range of contact angle hysteresis is relatively wide. The relationship between AF interface characteristics and film thickness proves that the oleophobic surface also has a good film-forming ability. |
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