首页|Tribological properties and tribomechanism of nickel nanoparticles in-situ synthesized in rapeseed oil

Tribological properties and tribomechanism of nickel nanoparticles in-situ synthesized in rapeseed oil

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Nickel(Ni)nanoparticles can be enriched on the surface of iron-based frictional pairs,which provides the possibility to get rid of the competitive adsorption between the polar species of vegetable oil and the surface-active nano-additives thereon.In this paper,nickel acetylacetonate was used as a precursor to in-situ synthesize nickel nanoparticles with an average diameter of about 12 nm in rapeseed oil(RO)as the reducing agent,surface modifier,and solvent as well.The tribological properties of the as-synthesized Ni nanoparticles were evaluated with a four-ball tribometer,and their tribomechanism was investigated based on the characterizations of the tribofilm on rubbed steel surfaces by the scanning electron microscopy(SEM),transmission electron microscopy(TEM),and X-ray photoelectron spectroscopy(XPS).It was found that the Ni nanoparticles in-situ prepared in the RO with a mass fraction of 0.3%can reduce the wear scar diameter(WSD)of the steel ball by 36%.This is because,on the one hand,the Ni nanoparticles are adsorbed on the rubbed steel surfaces to repair or fill up the micro-pits and grooves thereon.On the other hand,Ni nanoparticles participate in tribochemical reactions with atmospheric O and steel substrate to form the tribochemical reaction film on the rubbed steel surfaces with the assistance of friction-induced heat and applied normal load.In addition,an amorphous carbon film is formed on the rubbed surface via the carbonization of base oil under the catalysis of Ni nanoparticles.The adsorbed Ni layer,the tribochemical reaction film,and the carbon layer comprise a composite tribofilm composed of amorphous carbon,polar fatty acid,metallic nickel,iron oxides,and nickel oxides on the rubbed steel surfaces,which contributes to significantly improving the antiwear ability and load-carrying capacity of the RO for the steel-steel sliding pair.

nickel(Ni)nanoparticlesrapeseed oil(RO)in-situ synthesistribological propertiestribomechanism

Wenya XU、Guangbin YANG、Shengmao ZHANG、Jun XU、Yujuan ZHANG、Tianhua SUN、Ningning SONG、Laigui YU、Pingyu ZHANG

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Engineering Research Center for Nanomaterials,Henan University,Kaifeng 475004,China

State Key Laboratory of Tribology in Advanced Equipment,Tsinghua University,Beijing 100084,China

国家自然科学基金国家自然科学基金Zhongyuan Science and Technology Innovation Leadership ProgramTribology Science Fund of State Key Laboratory of Tribology in Advanced EquipmentKey Research and Development and Promotion Projects in Henan ProvinceKey Research and Development and Promotion Projects in Henan ProvinceKey Research and Development and Promotion Projects in Henan Province

5187517252105180214200510024SKLTKF21B06212102310410232102230067232102230081

2024

10.1007/s40544-023-0776-0

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CSTPCDEI
ISSN：2223-7690
年,卷(期)：2024.12(3)
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