几种添加剂在锂基润滑脂中的极压协同性能及表面摩擦行为研究

发布时间：2018-08-30 19:10

【摘要】：目的通过优化不同添加剂复配比例以提高润滑脂的极压性能。方法采用三阶单纯形-重心设计法,将二烷基二硫代氨基甲酸锑(Sb DTC)、二烷基二硫代磷酸锌(ZDDP)和硫化异丁烯(SE)3种添加剂按不同比例形成10种配方,利用梯姆肯摩擦试验机评价不同添加剂配方在三种基础润滑脂中的极压性能和适应性,从而筛选具有极压协同效应的配方,并通过X射线光电子能谱仪(XPS)对磨斑表面反应膜的元素化学状态和深度分布进行分析。结果配方1—7均能不同程度地改进3种基础润滑脂的极压性能,尤其在环烷基基础油的锂基润滑脂(N-Li)中具有较好的适应性。其中,配方5(Sb DTC与SE等比例复配)在基础润滑脂的极压性能最好,梯姆肯OK值达到315 N,XPS测得其反应膜厚度为20~30 nm,反应膜中的Sb、S含量较高;配方6(ZDDP与SE等比例复配)在基础润滑脂中的极压性能较差,OK值在135 N以下,表现出对抗作用。配方8—10中改变3组分复配比例后,不同配方的极压性能差异比较大,其中Sb DTC浓度比例越高,对改进润滑脂极压性能的效果越明显。结论 3种添加剂的复配比例对其极压性能的影响较大,其中Sb DTC与SE和ZDDP等比例复配后,具有良好的极压协同性能。添加剂的极压性能与摩擦表面形成的润滑膜厚度和活性元素的含量相关,尤其是表面Sb、S元素含量高低对极压性能影响较大。
[Abstract]:Objective to improve the extreme pressure performance of grease by optimizing the proportion of different additives. Methods Third-order simplex barycenter design method was used to form 10 formulations of three additives, SB dialkyl dithiocarbamate (Sb DTC), zinc dialkyl dithiophosphate (ZDDP) and isobutene sulfide (SE) in different proportion. The extreme pressure performance and adaptability of different additive formulations in three basic lubricating greases were evaluated by using Timken friction tester. The chemical state and depth distribution of the reaction film were analyzed by X-ray photoelectron spectroscopy (XPS). Results the formula 1-7 can improve the extreme pressure performance of three basic greases, especially in the lithium base grease (N-Li) of naphthenic base oil. The ratio of formula 5 (Sb DTC and SE) was the best in the base grease, and the OK value of Timken reached 315NX. The thickness of the reaction film was 20 ~ 30 nm, and the Sb,S content in the reaction film was higher than that in the base grease. Formula 6 (ratio of ZDDP and SE) has poor extreme pressure performance in base grease with a value below 135N, showing antagonistic effect. When the ratio of three components in formula 8-10 is changed, the extreme pressure performance of different formulations varies greatly. The higher the ratio of Sb DTC concentration is, the more obvious the effect of improving extreme pressure performance of grease is. Conclusion the ratio of the three additives has a great influence on the extreme pressure performance, and the ratio of Sb DTC to SE and ZDDP has good synergistic performance of extreme pressure. The extreme pressure properties of additives are related to the thickness of lubricating film formed on the friction surface and the content of active elements, especially the content of Sb,S on the surface has a great influence on the extreme pressure properties.
【作者单位】：空军勤务学院学员一大队;空军勤务学院航空油料物资系;
【基金】：国家自然科学基金项目(51575525) 江苏省自然科学基金(BK20141123,BK20151137) 清华大学摩擦学国家重点实验室开放基金(SKLTKF14B10)~~
【分类号】：TE624.83

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