Influence of Lubrication Condition and Cylinder Liner Material on Friction and Wear Characteristics of Piston Ring-Cylinder Liner
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摘要: 在润滑油中未添加和添加质量分数0.1%MoS2润滑条件下，对YH31合金铸铁活塞环和不同材料（高硼铜铸铁和铬钼铝铸铁）缸套进行摩擦磨损试验，研究了润滑条件和缸套材料对摩擦因数、体积磨损量和磨损表面形貌的影响，分析了磨损机制。结果表明：MoS2的添加可以缩短活塞环与高硼铜铸铁缸套的磨合时间，延长稳定磨损时间，降低摩擦因数，减小体积磨损量；摩擦副表面磨痕较未添加MoS2润滑条件下细而浅，且未出现裂纹。在未添加MoS2润滑条件下，活塞环与铬钼铝铸铁缸套对磨比与高硼铜铸铁缸套对磨更早进入稳定磨损阶段，但稳定磨损持续时间较短，平均摩擦因数有所增大，体积磨损量大幅增加；活塞环的磨损机制均为抛光磨损，高硼铜铸铁缸套和铬钼铝铸铁缸套的磨损机制分别为磨粒磨损+疲劳磨损和磨粒磨损。Abstract: Friction and wear tests were conducted on YH31 alloy cast iron piston ring and cylinder liner of different materials (high boron copper cast iron and CrMoAl cast iron)under lubrication conditions of lubricating oil without and adding 0.1wt% MoS2.Influence of the lubrication condition and cylinder liner material on the friction coefficient, volumetric wear loss and wear surface morphology was studied, and the wear mechanism was analyzed.The results show that adding MoS2 shortened the running in period of the piston ring and high boron copper cast iron cylinder liner, prolonged the stable wear period, decreased the friction coefficient and reduced the volumetric wear loss; the wear marks on the rubbing pair surfaces were finer and more shallow than those under the lubrication condition without MoS2, and no cracks were found.Under the lubrication condition without MoS2, the piston ring matched with CrMoAl cast iron cylinder liner entered the stable wear stage earlier than that matched high boron copper cast iron cylinder liner, but the stable wear stage lasted shortly, the average friction coefficient increased, and the volumetric wear loss increased greatly.The wear mechanism of the piston ring was polishing wear; the high boron copper cast iron and CrMoAl cast iron cylinder liner had abrasive wear+fatigue wear and abrasive wear mechanisms, respectively.
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Keywords:
- piston ring /
- cylinder liner /
- rubbing pair /
- wear /
- surface morphology
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