Abstract

Herein, core–shell structural SiO₂@Cu and SiO₂@MoS₂ microspheres were prepared using SiO₂ as hard core, Cu and MoS₂ as shell. As lubricant additives were introduced into base oil (PAO 40), their friction reduction and wear resistance were investigated in detail. Comparing with onefold additive (SiO₂, Cu and MoS₂), such core–shell structural additives can improve the tribological behaviors at the Hertz contact stress range of 1.26–2.72 GPa (SiO₂@Cu reduces the friction and wear up to 32.47% and 67.86% at 2.72 GPa, respectively). Besides, the tribological properties of SiO₂@Cu microspheres are superior to that of SiO₂@MoS₂ (the wear volume was reduced by 48.45% at 2.72 GPa). The excellent tribological behaviors of SiO₂@Cu microspheres can be ascribed to its structural advantage, the synergistic effect of hard SiO₂ core and Cu shell. The rolling effect of SiO₂, easy-shearing and self-repairing of Cu shell offer a synergistic lubrication function and form a dense protection film, thereby contributing to the optimal lubrication performance.

Graphical Abstract

中文翻译：

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SiO2@Cu 和 SiO2@MoS2 核壳微球作为润滑剂添加剂的摩擦学性能

摘要

在此，以SiO ₂为硬核，Cu 和MoS ₂为壳，制备了核壳结构的SiO ₂ @Cu 和SiO ₂ @MoS ₂微球。将润滑油添加剂引入基础油（PAO 40）中，对它们的减摩性和耐磨性进行了详细研究。与单一添加剂（SiO ₂、Cu 和 MoS ₂）相比，这种核壳结构添加剂可以改善赫兹接触应力范围 1.26-2.72 GPa 下的摩擦学行为（SiO ₂ @Cu 减少摩擦和磨损高达 32.47% 2.72 GPa 时分别为 67.86%）。此外，SiO ₂的摩擦学性能@Cu 微球优于 SiO ₂ @MoS ₂（磨损量在 2.72 GPa 时减少了 48.45%）。SiO ₂ @Cu 微球优异的摩擦学性能可归因于其结构优势、硬 SiO ₂核和 Cu 壳的协同作用。SiO ₂的滚动作用、Cu壳的易剪切和自修复提供协同润滑功能并形成致密的保护膜，从而有助于最佳润滑性能。

图形概要