幾種添加劑在鋰基潤滑脂中的極壓協(xié)同性能及表面摩擦行為研究
[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.
【作者單位】: 空軍勤務(wù)學院學員一大隊;空軍勤務(wù)學院航空油料物資系;
【基金】:國家自然科學基金項目(51575525) 江蘇省自然科學基金(BK20141123,BK20151137) 清華大學摩擦學國家重點實驗室開放基金(SKLTKF14B10)~~
【分類號】:TE624.83
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