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Comparison of Boundary Lubrication Films Formed under Four-Ball Friction Test Conditions with Different AW/EP Additives - an X-ray Photoelectron Spectroscopy Study

机译:在四球摩擦试验条件下使用不同的AW / EP添加剂形成的边界润滑膜的比较-X射线光电子能谱研究

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摘要

The antiwear and extreme-pressure properties of six different types of additive (molybdenum dialkyldithiophosphate, dibenzyl disulphide, molybdenum dialkyldithiocarb-amate, zinc dialkyldithiophosphate, chlorinated paraffin wax, and triaryl phosphate) were evaluated by standard four-ball friction and wear tests. This was followed by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and X-ray photoelectron imaging (XPI) analyses of the worn surfaces to determine the structure of the boundary lubrication film and the mechanism of the tribochemical reaction occurring during the friction process. The presence of the additives in the base oil significantly increased the weld load and drastically reduced the wear-scar diameter, suggesting anti-wear and extreme-pressure properties of the additives. The enhanced antiwear and load-carrying capacity of the additive-containing oils was attributed to the formation of a complex boundary lubrication film formed between the surfaces during the friction process as a result of the tribochemical reaction. The antiwear and extreme-pressure properties of the additives were explained based on the XPS data. The studies indicated that the lubricating properties of the additives depend on their chemical nature and reactivity with metal surfaces.
机译:通过标准的四球摩擦和磨损试验评估了六种不同类型的添加剂(二烷基二硫代磷酸钼,二硫化二苄基钼,二烷基二硫代氨基甲酸钼),二烷基二硫代磷酸锌,氯化石蜡和磷酸三芳基酯的抗磨性能和极压性能。然后对磨损的表面进行扫描电子显微镜(SEM),X射线光电子能谱(XPS)和X射线光电子成像(XPI)分析,以确定边界润滑膜的结构和摩擦化学反应的机理发生在摩擦过程中。基础油中添加剂的存在显着增加了焊接负荷,并大大降低了磨损痕迹直径,表明添加剂的抗磨性和极压性能。含添加剂的油具有更高的抗磨性和承载能力,这归因于摩擦化学反应在摩擦过程中在表面之间形成了复杂的边界润滑膜。根据XPS数据解释了添加剂的抗磨性和极压性能。研究表明,添加剂的润滑性能取决于其化学性质和与金属表面的反应性。

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