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。
The work aims to improve extreme pressure properties of lubricating greases by optimizing compound proportion of different additives. Three kinds of additives, antimony dialkyldithiocarbamate （SbDTC）, zinc dialkyldithiophosphate （ZDDP）, sulfurized isobutylene （SE）, were used to form 10 formulas in different proportions in the method of three component simp-lex-centroid design. Extreme pressure property and adaptability of different additive formulas in three base greases were eva-luated using Timken wear tester, so as to select the formula with extreme pressure synergistic effect, and elemental chemical state and depth distribution on worn surface reaction film were analyzed using X-ray photoelectron spectroscopy （XPS）. Ex-treme pressure properties of the three base greases could be improved by formula 1—7 to varying degrees, lithium-based greases （N-Li） exhibited better adaptability in naphthenic-based oil. Formula 5 （SbDTC and SE compounded in equal proportion） exhi-bited the best extreme pressure property in base greases with Timken OK load of 315 N, film thickness measured by XPS of 20~30 nm and higher content of Sb and S in the reaction film. Formula 6 （ZDDP and SE compounded in equal proportion） exhi-bited the worst extreme pressure in base greases with 135 N Timken OK load of below 135 N, and it showed counteraction. For formula 8—10, when compound ratio of the three constituents was changed, the formulas varied a lot in extreme pressure prop-erties. The higher the proportion of SbDTC concentration was, the more obvious the effect on improving grease extreme pres-sure properties. the compound ratio of the 3 additives has a great influence on its extreme pressure properties, SbDTC exhibits favorable extreme pressure synergistic properties when being mixed with SE and ZDDP in equal proportion. The extreme pres-sure properties of the additives are related to thickness of the lubricating film formed on the wear surface and content of active elements, especially Sb and S content
出处
《表面技术》
EI
CAS
CSCD
北大核心
2017年第7期97-103,共7页
Surface Technology
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)~~
关键词
添加剂
润滑脂
极压性能
协同
摩擦反应膜
元素含量
additive
lubricating grease
extreme pressure properties
synergy
tribological reaction film
element content
