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Preparation and tribological properties of core-shell Fe3O4@C microspheres

机译：核心壳Fe3O4 @ C微球的制备及摩擦学特性

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摘要

To improve the dispersion property of the magnetic Fe3O4 nano-lubricant additives, the carbon layers were successfully decorated on the surface of Fe3O4 to fabricate the magnetic core-shell Fe3O4@C microspheres by a simple in-situ precipitation method combined with subsequent hydrothermal carbonization. A series of analysis technologies were utilized to characterize the morphology, structure and components of Fe3O4@C microspheres. Interestingly, the results showed that Fe3O4 core with diameter of about 0.5-0.8 mu m is composed of numerous and small-sized Fe3O4 nanoparticles, and the carbon layer with the thickness of about 17 nm is decorated on the surface of Fe3O4. When considered as lubricant additives for sunflower oil, 0.25 wt% Fe3O4@C microspheres dispersed in sunflower oil exhibit significantly reduction in friction coefficient and wear scar width up to 15.4% and 31.7% compared to neat sunflower oil, respectively. Even at high load and sliding speed, a stable friction coefficient as low as 0.077 could be maintained. The improved tribological performance of Fe3O4@C microspheres can be ascribed to the core-shell structure and the synergistic effect between carbon layer and magnetic Fe3O4 nanoparticles.
机译：为了改善磁性Fe3O4纳米润滑剂添加剂的分散性，通过简单的原位沉淀法与随后的水热碳化结合，成功地装饰在Fe3O4的表面上以制造磁芯 - 壳Fe3O4 @ C微球。利用一系列分析技术来表征Fe3O4 @ C微球的形态，结构和组分。有趣的是，结果表明，直径约为0.5-0.8μm的Fe3O4芯由许多小尺寸的Fe3O4纳米颗粒组成，并且厚度为约17nm的碳层在Fe3O4的表面上装饰。当被认为是葵花籽油的润滑剂添加剂时，分散在向日葵油中的0.25wt％Fe3O4 @ C微球显着降低摩擦系数，磨损瘢痕宽度，分别与纯葵花籽油相比，磨损疤痕宽度高达15.4％和31.7％。即使在高负荷和滑动速度下，也可以保持低至0.077的稳定摩擦系数。改善Fe3O4 @ C微球的摩擦学性能可以归因于核心壳结构和碳层和磁Fe3O4纳米颗粒之间的协同效应。

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