几种硫化脂肪在菜子油中的润滑行为

以精制菜子油为基础油,在四球摩擦磨损试验机上考察了几种硫化脂肪对菜子油摩擦化学性能的影响·实验结果表明,几种硫化脂肪均能明显改善菜子油的减摩耐磨性及其极压性能·当添加剂含量较少时,其磨斑直径随添加剂含量的增加而减小,继续增加添加剂的含量,磨斑直径会明显增大·润滑油的PB值和PD值随添加剂含量的增加而提高·特别是添加剂RC2540的加入对烧结负荷影响非常明显,加入3%的RC2540,即可使PD达到7845N·扫描电子显微镜及能谱分析表明,硫化脂肪在摩擦过程中发生了摩擦化学反应,形成了一种含有活性硫元素的极压保护膜,从而起到减摩耐磨作用·

Lubricating Behavior of Some Sulfuretted Fats in Rape-Seed Oil

?The effect of some sulfuretted fats as additives on the tribochemical properties of rape-seed oil was investigated on a four-ball friction wear tester with refined rape-seed oil taken as base oil. It has been found that these fats can all obviously improve the load-carrying capacity and antiwear antifriction ability of rape-seed oil, with the wear spot diameters reduced if the small amount of additive used is increasing to a certain extent. However the wear spot diameters increase obviously if increasing further the additive amount. The P_B and the P_D values also increase with the increasing additive amount. In particular the effect of additive RC?2540 on sinter charge is so obviously that adding 3% RC?2540 enable the P_D value to up to 7?845?N.The results of SEM and SEDX analysis showed that the sulfuretted fats can cause tribochemical reactions in the friction process to form an extreme pressure protection film containing active sulfur element, which plays the role of antiwear and antifriction.