纳米SiC微粒作为润滑油添加剂对钢/钢摩擦副磨损机制转变影响的研究

摘要

SiC nanoparticles were added into engine oil as additive, friction and wear test was conducted on M200 model friction and wear testing machine within a load of 400 to 1 300 N and a sliding speed range of 0.42 ～ 0.84 m/s.Through careful analysis of the worn surface by scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS), effects of SiC nanoparticles on wear mechanisms transition of steel/steel coupling and the wear mechanism transition map was established.The results show that SiC nanoparticales increase the wear of loss because lubrication film is destroyed under low load and sliding speed conditions.With high load and high sliding speed, SiC nanoparticales prevent the rubbing surfaces from coming into direct contact, and act as ball bearing between two mutuall sliding surfaces which leads to micro-rolling wear from macro-sliding wear, so that severe adhesive wear is inhibited, the wear loss is reduced and the load-carrying capacity of engine oil is improved in the bad environment.%本文采用经过表面修饰的纳米SiC微粒作为润滑油添加剂,在M200磨损试验机上进行磨损试验,通过磨损表面的显微分析和能谱分析,研究载荷为400～1 300 N、滑动速率为0.42～0.84 m/s范围内,纳米SiC微粒对油润滑条件下钢/钢摩擦副磨损机制转变的影响,并建立磨损机制图.结果表明:低速低载荷条件下,纳米SiC微粒的添加破坏润滑油膜的连续性,造成磨损量增加;高速高载荷条件下,纳米SiC微粒通过隔离摩擦副,变宏观滑动磨损为微观滚动磨损,并抑制黏着磨损的产生,提高了润滑油在恶劣环境下的润滑能力,降低了磨损量.