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首页> 外文会议>World Tribology Congress III vol.1; 20050912-16; Washington,DC(US) >FRICTION-INDUCED CHANGE OF BORON HYBRIDIZATION IN LUBRICANT ADDITIVES
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FRICTION-INDUCED CHANGE OF BORON HYBRIDIZATION IN LUBRICANT ADDITIVES

机译：润滑油添加剂中硼杂化的摩擦诱导变化

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摘要

Tribochemical interactions between antiwear zinc dithiophosphate (Zndtp), friction modifier molybdenum dithiocarbamate (Modtc) and overbased detergent calcium borate (OCB) lubricant additives have been investigated. A Cameron-Plint friction machine was used to generate large tribofilm areas in mild tribological conditions. Two analytical techniques, X-ray photoelectron spectroscopy (XPS) and X-ray absorption near edge structure spectroscopy (XANES), have been employed to characterize the chemical species in tribofilms. XANES spectroscopy at the P K and L-edges, S K-edge, Mo L and M-edges and B K-edge was carried out in order to investigate phosphate, sulfide and borate species in tribofilms. The XANES spectra were recorded in both the total electron yield (TEY), surface sensitive and fluorescent yield (FY), bulk sensitive mode. This was completed with XPS analyses in the same location in the tribofilm. The ternary system Zndtp + Modtc + OCB provides a low wear rate comparable to the binary system Modtc + OCB. XANES analyses have shown that adding OCB to the binary system Zndtp + Modtc increases the formation of MoS_2 and reduce the formation of ZnS. It has been seen that few quantity of boron is consumed during the tests, meaning that boron does not react with other additives, we only observe a formation of calcium phosphate. A special attention has been paid on the hybridization of boron (trigonal sp2 and tetrahedral sp3). All tribofilms show a higher proportion of trigonal borate than the additives alone. However, this proportion is the highest in the case of tribofilms produce with the ternary mixture OCB + Zndtp + Modtc. Borate has a planar conformation and could be friction-oriented in the sliding interface. The oriented borate planar molecule might be at the origin of the MoS_2 sheets orientation in the ternary system.
机译：研究了抗磨二硫代磷酸锌（Zndtp），摩擦改性剂二硫代氨基甲酸钼（Modtc）和高碱性清洁剂硼酸钙（OCB）润滑剂添加剂之间的摩擦化学相互作用。使用Cameron-Plint摩擦机在温和的摩擦条件下产生较大的摩擦膜面积。 X射线光电子能谱（XPS）和X射线吸收近边缘结构光谱（XANES）等两种分析技术已被用来表征摩擦膜中的化学物质。为了研究摩擦膜中的磷酸盐，硫化物和硼酸盐种类，进行了P K和L边缘，S K边缘，Mo L和M边缘以及B K边缘的XANES光谱分析。 XANES光谱以总电子产率（TEY），表面敏感和荧光产率（FY），体敏模式记录。这是通过在摩擦膜的相同位置进行XPS分析完成的。三元系统Zndtp + Modtc + OCB提供了与二元系统Modtc + OCB相当的低磨损率。 XANES分析表明，将OCB添加到二元体系Zndtp + Modtc中会增加MoS_2的形成并减少ZnS的形成。可以看出，在测试过程中消耗的硼很少，这意味着硼不会与其他添加剂发生反应，我们仅观察到了磷酸钙的形成。特别注意硼的杂交（三角形sp2和四面体sp3）。所有的摩擦膜都显示出高于单独的添加剂的三角硼酸盐比例。但是，在使用三元混合物OCB + Zndtp + Modtc生产摩擦膜的情况下，该比例最高。硼酸盐具有平面构型，并且在滑动界面中可以是摩擦取向的。取向的硼酸盐平面分子可能在三元体系中MoS_2片取向的起点。

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