固-液复合润滑对轴承钢摩擦学性能的影响

为了提高GCr15钢的耐磨性和承载能力,采用低温离子渗硫技术在GCr15钢的表面制备了FeS固体润滑薄膜,在球-盘摩擦磨损试验机上对比研究了在基础油及2种含硫极压抗磨添加剂(ZDDP和SO)润滑条件下GCr15钢渗硫前后的摩擦学性能.利用SEM观察了磨损表面的形貌,利用XPS分析了磨损表面边界润滑膜化合物的价态及元素随深度的变化.研究表明:在摩擦过程中,表面的硫化层会阻碍润滑油中的添加剂与基体之间的作用,当添加剂与基体直接接触时其作用才能发挥.只有当硫化层破坏程度较小时,与添加剂的复合作用效果才较为明显.含硫添加剂与基体之间的反应可以补充硫化层因磨损失去的FeS,体现了显著的复合润滑效果.其中,高活性的硫烯比需要温度催化的ZDDP对硫化层的补充作用更明显.

The Effect of Solid - Liquid Composite Lubrication on the Tribological Properties of Bearing Steel

Low temperature ion sulfuration was used to treat 52100 steel in order to improve its wear -resistance and anti- scuffing property . Two different sulfur -containing extreme pressure and anti wear additives were used to examine their synergistic effects with FeS layer . The tribological properties were investigated on a ball- on- disk sliding friction and wear tester . SEM was employed to analyze the morphologies of worn surface , and XPS was adopted to identify the valence state of typical elements of boundary lubricating film and detect the depth Profile of elements . The results showed that sulfide layer on the surface prevented the additive and the substrate from direct contact and inhibited the effect of additive . The solid - liquid composite lubrication Possessed an obvious synergistic effect when the duration of FeS layer was long . The sulfllr -containing additives reacted with substrate to form FeS to supplement the loss of sulfide layer in wearing process . This incarnated the beneficial synergistic effect of composite lubrication . Sulfuration olefin (SO ) with high activity had better replenishinge effect than that of zinc dialkyl dithiophosphate ( ZDDP ) whose activity depended on catalysis of temperature.