摘要
为提高柴油机铝合金活塞的可靠性和耐用性,在不同电源占空比下通过微弧氧化实验在铝合金基体上制备得到微弧氧化陶瓷层,利用电泳技术将MoS2微纳米粒子引入陶瓷层的孔隙中,制备得到陶瓷基自润滑复合涂层。研究微弧氧化电源占空比对陶瓷层和复合涂层微观形貌、厚度和表面粗糙度的影响,并利用往复式摩擦磨损试验机在干摩擦、油润滑条件下对复合涂层的摩擦学性能进行分析。结果表明:随占空比的提高,微弧氧化陶瓷层的厚度、表面粗糙度呈现先增加后减小的变化趋势;随占空比的提高,制备得到的复合涂层的摩擦因数先减小后增大,占空比为60%~70%得到的复合涂层摩擦因数最低,且复合涂层与基体结合状态好,抗磨自润滑性能显著。
In order to improve the reliability and durability of the aluminum piston of diesel engine,the micro-arc oxidation ceramic layer was prepared on the aluminum alloy matrix under different power duty cycle,and then the ceramic matrix self-lubricating composite coating was prepared by introducing MoS2 nanoparticles into the pores of ceramic layer with electrophoretic technique.The influence of micro-arc oxidation power supply duty cycle on the microstructure of the composite coating,the thickness and surface roughness of the micro-arc oxidation ceramic layer and the ceramic matrix self-lubricating composite coating was analyzed,and the tribological properties of the composite coating under dry friction and oil lubrication were studied on a reciprocating friction and wear tester.The results show that with the increase of duty cycle,the thickness and surface roughness of micro arc oxidation ceramic layer are first increased and then decreased.with the increase of duty cycle,the friction coefficient of ceramic matrix self-lubricating composite coating is first decreased and then increased.The composite coating under duty cycle from 60%to 70%has the lowest friction coefficient,and the composite coating has a good bonding state with the substrate,which show remarkable anti-wear and self-lubricating effect.
作者
孙长飞
李更天
马春生
SUN Changfei;LI Gengtian;MA Chunsheng(School of Marine Electrical and Intelligent Engineering,Jiangsu Maritime Vocational and Technical College,Nanjing Jiangsu 211170,China;Dalian Jiehua Marine Technology Co.,Ltd.,Dalian Liaoning 116113,China;School of Marine Engineering,Dalian Maritime University,Dalian Liaoning 116026,China)
出处
《润滑与密封》
CAS
CSCD
北大核心
2021年第5期75-80,共6页
Lubrication Engineering
基金
交通运输部应用基础研究项目(2015-329-225-230)
2020年江苏省高职院校教师专业带头人高端研修(个人访学)项目(2020GRFX025)。
关键词
活塞
微弧氧化
陶瓷基自润滑复合涂层
铸造铝合金
piston
micro-arc oxidation
ceramic base self-lubricating composite coating
cast aluminum alloy
