High-pressure rheological properties of polyalphaolefin and ester oil blends and their impact on lubrication

IF 6.1 1区 工程技术 Q1 ENGINEERING, MECHANICAL
Jingbo Fang , Hui Cao , Pengpeng Bai, Yonggang Meng, Liran Ma, Yu Tian
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引用次数: 0

Abstract

Different base oils are often blended to optimize lubrication effectiveness. For blends of polyalphaolefins (PAOs) and ester oils, while their boundary lubrication performance is well-studied, studies on their rheological properties and elastohydrodynamic lubrication (EHL) are limited. This study investigates the viscosity and EHL properties of PAO 8 and pentaerythritol tetra(2-ethylhexanoate) (PEB 8) blends at various blending ratios, pressures, and temperatures. Results showed that under certain conditions, viscosities of the blends are lower than either base oil. This phenomenon was explained from a molecular perspective. The pressure–viscosity relationship was fitted using the Doolittle-Tait free-volume model. Additionally, studies of EHL performance and simulations of different oils correlate the pressure–viscosity to EHL characteristics. These findings provide insights for future lubricant formulation.

聚α烯烃和酯类混油的高压流变特性及其对润滑的影响
不同的基础油经常混合使用,以优化润滑效果。对于聚α烯烃(PAOs)和酯类油的混合物,虽然对其边界润滑性能进行了深入研究,但对其流变特性和弹性流体动力润滑(EHL)的研究却很有限。本研究调查了 PAO 8 和季戊四醇四(2-乙基己酸酯)(PEB 8)混合物在不同混合比例、压力和温度下的粘度和 EHL 性能。结果表明,在某些条件下,混合物的粘度低于任何一种基础油。我们从分子角度解释了这一现象。使用杜利特尔-泰特(Doolittle-Tait)自由体积模型拟合了压力-粘度关系。此外,对 EHL 性能的研究和对不同机油的模拟也将压力-粘度与 EHL 特性联系起来。这些发现为未来的润滑油配方提供了启示。
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来源期刊
Tribology International
Tribology International 工程技术-工程:机械
CiteScore
10.10
自引率
16.10%
发文量
627
审稿时长
35 days
期刊介绍: Tribology is the science of rubbing surfaces and contributes to every facet of our everyday life, from live cell friction to engine lubrication and seismology. As such tribology is truly multidisciplinary and this extraordinary breadth of scientific interest is reflected in the scope of Tribology International. Tribology International seeks to publish original research papers of the highest scientific quality to provide an archival resource for scientists from all backgrounds. Written contributions are invited reporting experimental and modelling studies both in established areas of tribology and emerging fields. Scientific topics include the physics or chemistry of tribo-surfaces, bio-tribology, surface engineering and materials, contact mechanics, nano-tribology, lubricants and hydrodynamic lubrication.
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