Investigation of tribological properties of MoS2 and CaF2 particles as oil additives and their effects on surface contact

IF 1.8 4区工程技术 Q3 ENGINEERING, CHEMICAL

Lubrication Science Pub Date : 2024-01-25 DOI:10.1002/ls.1695

Hasan Baş, Muhammet Ali Beşirbeyoğlu, Onur Özen

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Abstract

Nowadays, researches on the use of alkali metal salts as friction-reducing and anti-wear oil additives are continuing. In this study, the tribological effects of heavy metal containing MoS₂ and alkali metal salt CaF₂ additives on pure engine oil (20W50) were investigated using block-on-ring tester configured as surface contact geometry. The tests were performed at various contact loads, revolutions, and additive ratios. The crystal structure of the additives and their effects on surface quality and surface roughness analysed by x-ray crystallography, scanning electron microscope and profilometry. Moreover, Energy dispersive spectrometry was used for element detection on worn surfaces. Results indicated that additives of MoS₂ and CaF₂ can reduce the friction, increase the capacity of load-carrying and the wear resistance of surfaces. The additives improved the operation of the base oil in boundary lubrication zone by increasing the tribofilm forming effect. It was observed that the CaF₂ additive exhibited more stable friction behaviour, while the MoS₂ additive has better protective effects against scratches on the block surface.

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研究作为油添加剂的 MoS2 和 CaF2 颗粒的摩擦学特性及其对表面接触的影响

目前，有关使用碱金属盐作为减摩抗磨机油添加剂的研究仍在继续。在这项研究中，使用配置为表面接触几何形状的环块测试仪研究了含重金属 MoS2 和碱金属盐 CaF2 添加剂对纯机油（20W50）的摩擦学效应。测试在不同的接触载荷、转数和添加剂比例下进行。通过 X 射线晶体学、扫描电子显微镜和轮廓仪分析了添加剂的晶体结构及其对表面质量和表面粗糙度的影响。此外，还使用了能量色散光谱仪检测磨损表面上的元素。结果表明，MoS2 和 CaF2 添加剂可以减少摩擦，提高表面的承载能力和耐磨性。添加剂通过增加三膜形成效果，改善了基础油在边界润滑区的运行。据观察，CaF2 添加剂表现出更稳定的摩擦性能，而 MoS2 添加剂则对块体表面的划痕具有更好的保护作用。

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来源期刊

Lubrication Science ENGINEERING, CHEMICAL-ENGINEERING, MECHANICAL

CiteScore

3.60

自引率

10.50%

发文量

审稿时长

6.8 months

期刊介绍： Lubrication Science is devoted to high-quality research which notably advances fundamental and applied aspects of the science and technology related to lubrication. It publishes research articles, short communications and reviews which demonstrate novelty and cutting edge science in the field, aiming to become a key specialised venue for communicating advances in lubrication research and development. Lubrication is a diverse discipline ranging from lubrication concepts in industrial and automotive engineering, solid-state and gas lubrication, micro & nanolubrication phenomena, to lubrication in biological systems. To investigate these areas the scope of the journal encourages fundamental and application-based studies on: Synthesis, chemistry and the broader development of high-performing and environmentally adapted lubricants and additives. State of the art analytical tools and characterisation of lubricants, lubricated surfaces and interfaces. Solid lubricants, self-lubricating coatings and composites, lubricating nanoparticles. Gas lubrication. Extreme-conditions lubrication. Green-lubrication technology and lubricants. Tribochemistry and tribocorrosion of environment- and lubricant-interface interactions. Modelling of lubrication mechanisms and interface phenomena on different scales: from atomic and molecular to mezzo and structural. Modelling hydrodynamic and thin film lubrication. All lubrication related aspects of nanotribology. Surface-lubricant interface interactions and phenomena: wetting, adhesion and adsorption. Bio-lubrication, bio-lubricants and lubricated biological systems. Other novel and cutting-edge aspects of lubrication in all lubrication regimes.