The Influence of Mechanically Activated Kaolinite and Magnesium Spinel on Tribological Properties and Structure of PTFE Friction Surfaces

IF 0.5 4区工程技术 Q4 ENGINEERING, MECHANICAL

Journal of Friction and Wear Pub Date : 2023-02-15 DOI:10.3103/S1068366622050105

P. N. Tarasova, S. N. Danilova, A. A. Okhlopkova, N. N. Lazareva

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Abstract—

This article investigates the influence of mechanically activated kaolinite and magnesium spinel on tribological properties and structure of polytetrafluoroethylene (PTFE). The content of the fillers in a polymer matrix has been varied from 1 to 5 wt %. It has been established that combined addition of the fillers into PTFE results in an increase in wear resistance by 1125 times with respect to the initial polymer. It has been detected that combined addition of kaolinite with magnesium spinel leads to a decrease in sizes of secondary structures and absence of microcracks. It has been demonstrated that a magnesium spinel, being an active nanodisperse filler, actively participates in tribochemical processes and formation of a boundary layer. IR spectra of samples after friction contain absorption bands related to tribo-oxidation products, such as hydroxy groups and salts of carboxylic acids. It has been established that filling PTFE with mineral layered silicates promotes formation of transferred film on friction surfaces with the effect of a solid lubricant formed from transferred particles and oxidized structures of a polymer composite. Displacement of segments of layered structures to a wear composite surface with subsequent exfoliation has been detected. Therefore, the transferred film formed during friction and a secondary structure on composite surface facilitated sliding of the material. The developed materials can be used on friction units of machinery as components of pneumatic, hydraulic, and fuel systems in the North.

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机械活化高岭石和镁尖晶石对PTFE摩擦表面摩擦学性能和结构的影响

摘要:本文研究了机械活化高岭石和镁尖晶石对聚四氟乙烯(PTFE)摩擦学性能和结构的影响。填充剂在聚合物基体中的含量从1%到5%不等。已经确定，将填料组合添加到PTFE中，其耐磨性比初始聚合物增加1125倍。研究发现，高岭石和镁尖晶石的复合添加使二次结构尺寸减小，无微裂纹。镁尖晶石作为一种活性纳米分散填料，积极参与摩擦化学过程和边界层的形成。摩擦后样品的红外光谱包含与摩擦氧化产物有关的吸收带，如羟基和羧酸盐。用矿物层状硅酸盐填充PTFE，可以促进摩擦表面上转移膜的形成，这是由转移颗粒和聚合物复合材料氧化结构形成的固体润滑剂的作用。层状结构的部分位移到磨损复合表面，并伴有随后的剥落。因此，摩擦过程中形成的转移膜和复合材料表面的二级结构有利于材料的滑动。在北方，开发的材料可用于机械摩擦单元，作为气动、液压和燃料系统的组件。

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来源期刊

Journal of Friction and Wear ENGINEERING, MECHANICAL-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

1.50

自引率

28.60%

发文量

审稿时长

6-12 weeks

期刊介绍： Journal of Friction and Wear is intended to bring together researchers and practitioners working in tribology. It provides novel information on science, practice, and technology of lubrication, wear prevention, and friction control. Papers cover tribological problems of physics, chemistry, materials science, and mechanical engineering, discussing issues from a fundamental or technological point of view.