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    • Study on the Influences of Surface Coatings under Boundary Lubrication on the Frictional Performance of a Piston Skirt
    DOI：10.13949/j.cnki.nrjgc.2024.06.011
    Key Words:boundary lubrication  piston skirt  graphite  tungsten disulfide  friction and wear  zinc dialkyl dithiophosphate（ZDDP）
    Author NameAffiliationE-mail
    ZHANG Yuan College of Marine Engineering，Dalian Maritime University，Dalian 116026， China 1319098865@qq.com 
    WANG Jingsi* College of Marine Engineering，Dalian Maritime University，Dalian 116026， China wjs@dlmu.edu.cn 
    CUI Qihang College of Marine Engineering，Dalian Maritime University，Dalian 116026， China CQH15998161152@163.com 
    LIAO Junhui Hunan Jiangbin Machinery （Group） Co.， Ltd.， Xiangtan 411102， China ljunhui5647@163.com 
    LI Chengdi School of Mechanical and Electrical Engineering， Xinyu University， Xinyu 338004， China m_bigm@tju.edu.cn 
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    Abstract:The effects of surface solid lubricating coatings on the friction and wear performance of piston skirts under boundary lubrication conditions were studied， so as to provide supports for the design of piston skirt coatings for high-duty internal combustion engines. A self-built reciprocating friction and wear testing machine was utilized for conducting wear experiments with real cylinder liner and piston skirt samples. 38CrMoAl steel mirror nitride cylinder liners and two types of coated pistons， namely graphite and tungsten disulfide coated pistons （aluminum-silicon alloy matrix） were used in the experiments. The friction coefficient and wear of the two piston skirt-cylinder liner pairs were obtained under different working conditions， and the wear surface was also analyzed. The results show that under all working conditions， the wear amount and friction coefficient of the tungsten disulfide-coated piston skirts are smaller than those of the graphite-coated piston skirts. Under the three loading conditions of 15， 25 and 35 MPa， the friction coefficients and wear amounts show an upward trend for both friction pairs as the load increases. When the test temperature increases from 120 ℃ to 150 ℃， the decomposition of zinc dialkyl dithiophosphate （ZDDP） additive in the lubricating oil is promoted， and the friction coefficient and wear decreases. Under the load of 35 MPa， the friction coefficient and wear amount increase again when the test temperature increases from 150 ℃ to 180 ℃. It is considered that the abrasive wear caused by the exposure of silicon particles in the piston skirt increases under the combined action of high temperature and high load.
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