摘要
研究了纳米SiO_2作为润滑油添加剂的摩擦学性能及其与MoDDP的协同作用,并通过SEM,EDS,XPS等手段对磨斑表面进行分析,探索了纳米SiO_2的抗磨减摩机理。结果表明,当纳米SiO_2加入量(w)为0.5%时,润滑油的摩擦系数和磨斑直径分别比基础油降低30.6%和35.5%,显著提高了基础油的抗磨减摩性能。纳米SiO_2与MoDDP具有良好的协同作用。纳米SiO_2的抗磨减摩机理为:在摩擦副表面沟槽部位纳米SiO_2和MoDDP膜起填补作用;在凸处,纳米SiO_2起微"滚动轴承"作用,MoDDP在摩擦能量作用下分解为软的MoS_2并沉积在摩擦副表面,以上综合作用减小了摩擦,修复了摩擦副表面,从而提高了润滑油的抗磨减摩性能。但随着时间的延长,SiO_2对MoS_2沉积膜又具有轻微的刮擦作用。
The tribological properties of SiO2 nano-particles as lubricant additive were studied in this paper. The synergetic effect of SiO2 nano-particles and MoDDP additive was also investigated. The surfaces of tested wear spots were analyzed by TEM, EDS and XPS. Results showed that the existence of SiO2 nano- particles could significantly improve wear resistance and friction-reducing behavior of the base oil. The lowest friction coefficient and smallest wear scar diameter could be achieved with a SiO2 content of 0.5%, which was a 30.6% reduction and a 35.5% reduction as compared with that of the base oil, respectively. SiO2 nano-particles exhibited good synergistic effect with MoDDP additive. The anti-wear and friction-reducing mechanism of SiO2 nano-particles and MoDDP could be as follows： SiO2 nano-particles and MoDDP film fill the gaps in the concave parts of friction pair surfaces; SiO2 nano-particles act as slightly rolling bearing in convex parts, and at the same time the energy that is caused by friction can make MoDDP decompose to form a soft MoS2 deposit film on the friction pair surfaces. All these comprehensive actions reduce friction and repair the friction pair surfaces, so as to improve anti-wear and friction reducing properties of the lubricating oil. However, with time prolonging, SiO2 particles might slightly scrape the MoS2 film.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2010年第9期74-79,共6页
Petroleum Processing and Petrochemicals
基金
科技部科技型中小型企业创新基金项目(08C26213700982)
江苏科技厅社会发展计划项目(BS2007120)
南京工业大学无机及复合新材料重点实验室资助项目
关键词
纳米SIO2
润滑油添加剂
基础油
摩擦学性能
抗磨减摩机理
SiO2 nano-particles
lubricant additive
base oil
tribological property
mechanism of frictionreducing and wear resistance
