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    • Research on the Tribological Properties of Lubricant Based on ta-C Coating/Piston Ring–Liner Friction Pair
    DOI：10.13949/j.cnki.nrjgc.2022.03.007
    Key Words:ta-C coating  piston ring–cylinder liner  SN/GF—5 0W—20 engine oil  tribological property  molybdenum dialkyl dithiocarbamate（MoDTC）  zinc dialkyl dithiophosphate（ZDDP）
    Author NameAffiliationE-mail
    E Hongjun* Beijing Research Institute of Sinopec Lubricants Co.， Ltd.， Beijing 100085， China ehj.lube@sinopec.com 
    DU Xueling Beijing Research Institute of Sinopec Lubricants Co.， Ltd.， Beijing 100085， China  
    Ahebota·Baheti  Beijing Research Institute of Sinopec Lubricants Co.， Ltd.， Beijing 100085， China  
    JIN Jiajia Beijing Research Institute of Sinopec Lubricants Co.， Ltd.， Beijing 100085， China  
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    Abstract:The tribological properties of SN/GF—5 0W—20 engine oil with different content of molybdenum dialkyl dithiocarbamate（MoDTC） were studied on tetrahedral amorphous carbon（ta-C） coating/piston ring–cylinder friction pair by using SRV®4 multifunctional friction and wear tester. The research results show that MoDTC significantly affects the tribological properties of ta-C coating/piston ring–cylinder liner. When the content of Mo element is in the range of 0.03%~0.05% by weight， the friction and wear performance is the best. And when the content of Mo element is 0.10% by weight， the friction and wear performance is the worst. The effects of Yu4+ base oil/control group， Yubase4+（Yu4+）/MoDTC and Yu4+/MoDTC/zinc dialkyl dithiophosphate（ZDDP） lubrication systems on ta-C coating/piston ring–liner friction pairs were studied under the same friction and wear experiment conditions， and the wear step was analyzed by scanning electron microscope（SEM） and X-ray photoelectron spectroscopy（XPS）. The results show that the friction coefficient of the Yu4+/MoDTC system is the lowest， while that of the Yu4+/MoDTC/ZDDP system is the highest. This may be due to the high hardness of ta-C coating. The friction film of the cylinder liner of the Yu4+/MoDTC/ZDDP lubrication system contains ZDDP self-decomposition products and products that interact with MoDTC and the surface of the cylinder liner （such as MoO3， ZnS， Fe3O4， ZnO， etc.）. The uneven size of the abrasive particles in the friction film causes higher abrasive wear between the pairs， which causes the friction coefficient increasing.
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