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Tribological properties of synthetic base oil containing polyhedral oligomeric silsesquioxane grafted graphene oxide

机译：含多面体低聚倍半硅氧烷接枝氧化石墨烯的合成基础油的摩擦学性能

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The dispersion of graphene-based materials in lubricating oil is a prerequisite for improving its friction and wear performance. In this study, polyhedral oligomeric silsesquioxane (POSS) grafted graphene oxide (GO) was synthesized with an aim to improve the dispersibility of graphene in synthetic base oil. The composition and morphology of POSS-GO conjugates were characterized by FTIR, XPS, Raman spectroscopy, TEM and SPM. The tribological behavior of base oil with various concentrations of POSS-GO were examined using a UMT-3 friction and wear tester, and the worn surfaces were analyzed using Raman spectroscopy. It was found that concentrations of POSS-GO additives in the base oil is an important aspect for decreasing the friction and wear of the lubricated solid contacts. At lower and higher concentrations of POSS-GO, the lubricating effect is not effective or even worse. In contrast, at optimized concentration of POSS-GO, graphene sheets could form a boundary tribofilm between the contact, resulting in reduction of the friction coefficient and wear.
机译：石墨烯基材料在润滑油中的分散是改善其摩擦和磨损性能的先决条件。在本研究中，合成了多面体低聚倍半硅氧烷（POSS）接枝的氧化石墨烯（GO），目的是提高石墨烯在合成基础油中的分散性。用FTIR，XPS，拉曼光谱，TEM和SPM对POSS-GO结合物的组成和形貌进行了表征。使用UMT-3摩擦磨损测试仪检查了各种浓度的POSS-GO基础油的摩擦学行为，并使用拉曼光谱分析了磨损表面。已经发现，基础油中POSS-GO添加剂的浓度是降低润滑的固体触点的摩擦和磨损的重要方面。在较低和较高浓度的POSS-GO中，润滑效果无效或什至更差。相反，在POSS-GO的最佳浓度下，石墨烯片会在接触之间形成边界摩擦膜，从而导致摩擦系数和磨损降低。

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