| WANG You-qiang,ZHAO Tao,MO Jun,LIU Xin-fu,HE Yan.Synergistic Friction-reducing Mechanism of Nano-magnetic Fluid Lubrication on Grooved Surface Texture of Titanium Alloy[J],52(10):141-150 |
| Synergistic Friction-reducing Mechanism of Nano-magnetic Fluid Lubrication on Grooved Surface Texture of Titanium Alloy |
| Received:September 04, 2022 Revised:February 05, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.10.010 |
| KeyWord:titanium alloy grooved texture nano-magnetic fluid synergistic friction-reduction effect friction and wear fluid lubrication |
| Author | Institution |
| WANG You-qiang |
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Shandong Qingdao , China;Key Lab of Industrial Fluid Energy Conservation and Pollution Control, Ministry of Education, Shandong Qingdao , China |
| ZHAO Tao |
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Shandong Qingdao , China |
| MO Jun |
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Shandong Qingdao , China |
| LIU Xin-fu |
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Shandong Qingdao , China |
| HE Yan |
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Shandong Qingdao , China |
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| Abstract: |
| In order to improve the tribological properties of titanium alloy surfaces, a nano-second laser was used to construct a grooved micro-texture pattern on the surface of titanium alloy, and water-based nano-magnetic fluid and deionized water were used as lubricants. The mechanism of synergistic friction reduction between texture and nano-magnetic fluid was investigated with an UMT-3 friction and wear tester. For the friction experiment of grooved texture with different spacing, the experimental load was 3 N, the sliding speed was 36 mm/s, and the experimental time was 30 min. The load was kept constant at 3 N, and the variable velocity experiment was designed, with the speed increased from 6 mm/s to 48 mm/s in turn. The speed was kept at 36 mm/s, and the variable load experiment was designed. The load was successively increased from 0.5 N to 4 N. Firstly, the effect of the distribution spacing of the grooved texture on the friction and wear properties of the titanium alloy surface was analyzed under different lubrication conditions. The tribological properties of the titanium alloy surface were improved under the synergistic effect of the texture and nano-magnetic fluid. When the texture spacing was 250 μm, the tribological properties of the titanium alloy surface were the best, and the maximum friction coefficient was reduced by 51.5%. The wear rate was reduced by 77.6%. The grooves could store magnetic particles and abrasive debris, thus reducing the plowing effect of particles on the specimen. At the same time, lubricating oil could be stored inside the grooves. In friction, the internal lubricating oil was extruded to achieve "secondary lubrication", so as to reduce wear. In addition, the grooves of a certain size could also form a dynamic pressure effect when the friction pair slided, which increased the bearing capacity of the water film, and reduced the damage to the surface. When the texture spacing was too small, the bearing area of the textured surface was reduced, the shear force was enhanced, and the texture wear was faster, while the friction reduction effect of the texture was weakened when the texture spacing was too small. Secondly, based on the optimal texture spacing, the effects of different surface texture morphologies and depths on the tribological properties of titanium alloys were further investigated. The magnetofluid composite texture lubrication could change the lubrication state of the specimen surface from mixed lubrication on the smooth surface to dynamic pressure lubrication, which improved the tribological properties of the specimen. However, if the friction was tried, the wear of the texture would lead to the increase of the friction coefficient. When the texture was completely worn off, the friction coefficient was close to that under single Mfluidic lubrication. Finally, the effects of sliding velocity and load on the friction reduction performance of the groove texture of titanium alloy were investigated. In conclusion, when the dynamic pressure effect produced by the texture cannot cover the convex edge of the texture, the direct contact between the upper sample and the protrusion will lead to stress concentration, which will increase the friction coefficient and wear amount. When the dynamic pressure effect produced by the texture can cover the bump at the edge of the texture, the bump at the edge of the texture can be worn at a relatively gentle state. In this process, it can protect the texture and slow down the wear process of the texture. |
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