Tribological properties and anti-wear mechanism of ZnO@graphene core-shell nanoparticles as lubricant additives

Tribological properties and anti-wear mechanism of ZnO@graphene core-shell nanoparticles as lubricant additives
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ZnO@石墨烯核壳纳米粒子作为润滑油添加剂的摩擦学性能及抗磨机理

DOI:
10.1016/j.triboint.2019.106114
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发表时间:
2020-04
影响因子:
6.2
通讯作者:
Ran Xu
Ran Xu
中科院分区:
工程技术1区
文献类型:
--
作者:
Ren Baijing;Gao Liang;BotaoXie;Li Mengjun;Zhang Shangda;Zu Guoqing;Ran Xu

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石墨烯被认为是一种有前途的、环境友好的润滑油添加剂候选物。本工作提出了一种具有硬核和软壳的包覆纳米复合材料作为润滑油纳米添加剂。合成了三种形貌的ZnO纳米粒子作为核,制备了ZnO@graphene核壳纳米添加剂。采用四球摩擦磨损试验机对复合材料的减摩抗磨性能进行了评价。讨论了ZnO形态和浓度对摩擦学行为和磨损外观的影响。对磨痕的成分变化进行了表征,探讨了可能的抗磨机理。研究表明,片状ZnO是较为理想的形貌,ZnO@graphene硬核-软壳纳米结构更适合动摩擦环境。这种协同效应能有效地保持润滑膜的承载能力和稳定性,表现出优异的摩擦学性能。
Graphene is regarded as a promising, environmentally friendly candidate for lubricant additives. This work presents a coated nanocomposite with hard-core and soft-shell as lubricant nanoadditive. Three morphological ZnO nanoparticles are synthesized as the core to prepare ZnO@graphene core-shell nanoadditives. A four-ball machine is used to evaluate the anti-friction and anti-wear properties. The effects of ZnO morphology and concentration on the tribological behaviors and worn-out appearance are discussed. The compositional variation of wear scar is characterized to explore the possible anti-wear mechanisms. Researches suggest sheet-like ZnO is more ideal morphology, and ZnO@graphene hard core-soft shell nanostructure is more suitable for dynamic friction environment. The synergistic effect can effectively maintain load capacity and stability of lubricating film, exhibiting excellent tribological property.
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