| MA Wen-lin,WEI Liang-liang.Effect of Micro-texture on the Friction and Wear Performance of Copper-based Self-lubricating Composites[J],52(1):93-102 |
| Effect of Micro-texture on the Friction and Wear Performance of Copper-based Self-lubricating Composites |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.01.010 |
| KeyWord:circular micro-texture self-lubricating composites friction and wear friction coefficient transfer lubrication |
| Author | Institution |
| MA Wen-lin |
School of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou , China |
| WEI Liang-liang |
School of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou , China |
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| Abstract: |
| When the piston ring is in a high temperature and high pressure, inertia force of cycle repeats and other working conditions, between the piston ring and the cylinder will be extremely easy to wear the problem. As a result, in this paper, the frictional wear performance of circular micro-texture on copper-based self-lubricating composites is investigated by using a pin-disc model as the test object, with a view to improving the wear resistance of both. And to clarify the connection between the micro-texture structure under different working conditions and the frictional wear behavior of the composite material, while establishing design guidelines for the surface micro-texture structure. The test method applied in this paper is introduced as follows. Circular micro-texture structure with diameter of 0.2 mm is processed and prepared on the surface of 45# steel using CT-MF20 fiber engraving laser marking machine, then the friction performance of 45# steel with circular micro-texture is tested on HT-1000 friction and wear testing machine in the form of pin-disc contact. This test is conducted to examine the frictional wear of circular micro-texture under different loads (2, 10 and 20 N) and different sliding distances (1.88 m and 18.84 m) working conditions, including the results of the analysis of the variation of the friction coefficient and wear volume. The microstructure and morphology of the friction surface is analyzed by scanning electron microscopy (SEM), which includes the analysis of such elements as the degree of wear of abrasive marks on the surface of pins and discs, the phenomenon of plastic flow delamination, wear chips and material transfer. As well as, the accumulation of elements on the friction surface is examined by energy spectrometer (EDS) results, mainly to examine the accumulation phenomenon of oxygen elements. In addition, in order to contrast with the previous group, each group is provided with a 45 steel test of non-microtexture. In the friction test, it is found that the frictional wear performance of the circular micro-texture was optimal for a load of 20 N and a sliding distance of 18.84 m, in which the decrease of the average friction coefficient increases from 11% to 23.5% with the increase of sliding distance. At the same time, the decrease in the amount of pin wear is also the largest compared to the non-texture structure, by observing the degree of wear on the surface of the pin and disc (including the size of the abrasion marks and abrasion spots) is also slight for the circular micro-texture under this condition. Moreover, more oxygen elements are found on the surface of circular texture in the EDS results, which is concentrated in the texture. When the load is 20 N and the sliding distance is 18.84 m, the circular micro-texture has the best friction reduction and anti-wear effect, the friction coefficient becomes smaller, stable and the run-in time is shorter. The wear surface of this disc is smoother compared with other working conditions, mainly due to the ratcheting effect on the surface of the circular texture disc, which forms a continuous and stable transfer lubrication film under high load and long sliding distance. Therefore, the wear is minimal. |
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