Enhancing the Elastohydrodynamic Lubrication and Vibration Behavior of Rolling Bearings Using a Hybrid Bio-Grease Blended with Activated Carbon Nanoparticles

IF 2.9 3区 工程技术 Q2 ENGINEERING, CHEMICAL
Zeyad A. Abouelkasem, Galal A. Nassef, Mohamed Abdelnaeem, Mohamed G. A. Nassef
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Abstract

In recent years, bio-lubricants have received a growing interest for industrial applications. Still, a full-scale implementation in machinery lubrication requires a thorough evaluation of their performance through tribological and operational tests to stand upon their performance. Additionally, the promising outcomes achieved by nanoadditives in improving the performance of synthetic lubricants have prompted research efforts to identify suitable nanoadditives for bio-grease. This paper introduces a bio-grease from a hybrid vegetable oil and glycerol monostearate as a thickener for the lubrication of rolling bearings. Activated carbon nanoparticles (ACNPs) as nanoadditives were synthesized, characterized, and incorporated into the bio-grease at concentrations of 0.5, 1, and 2% by weight. Tribo-tests were conducted on these bio-grease blends, and running tests were carried out using 6006 ball bearings on a custom test rig. Throughout a 30-min test run under a radial load of 10% of the bearing’s dynamic load rating, mechanical vibrations and power consumption were measured and analyzed for each bearing. The bio-grease with ACNPs exhibited a substantial reduction in wear scar diameter (WSD) and coefficient of friction (COF), achieving improvements of up to 73.6 and 65%, respectively, in comparison to lithium grease. Furthermore, the load carrying capacity was enhanced by 200%. The study revealed a strong correlation between measured vibration amplitudes and the viscosity of the bio-grease. The absence of high frequency resonant bands in vibration spectra indicated that the test grease samples satisfied the conditions of elastohydrodynamic lubrication, and these findings were corroborated through calculations of the minimum oil film thickness.

使用混合了活性碳纳米颗粒的混合生物润滑脂增强滚动轴承的弹流润滑和振动性能
近年来,生物润滑剂在工业应用中受到越来越多的关注。不过,要在机械润滑中全面应用生物润滑剂,还需要通过摩擦学和操作试验对其性能进行全面评估,以确定其性能。此外,纳米添加剂在改善合成润滑剂性能方面取得了可喜的成果,这也促使研究人员努力为生物润滑脂寻找合适的纳米添加剂。本文介绍了一种以混合植物油和单硬脂酸甘油酯为增稠剂的生物润滑脂,用于滚动轴承的润滑。对作为纳米添加剂的活性碳纳米颗粒(ACNPs)进行了合成、表征,并将其加入生物润滑脂中,浓度分别为 0.5%、1% 和 2%(按重量计)。对这些生物润滑脂混合物进行了三重试验,并在定制试验台上使用 6006 滚珠轴承进行了运行试验。在轴承额定动载荷 10%的径向载荷下进行了 30 分钟的测试运行,测量并分析了每个轴承的机械振动和功耗。与锂基润滑脂相比,含有 ACNPs 的生物润滑脂显示出磨损痕直径(WSD)和摩擦系数(COF)的显著降低,分别达到 73.6% 和 65%。此外,承载能力还提高了 200%。研究显示,测得的振动振幅与生物润滑脂的粘度之间存在很强的相关性。振动频谱中没有高频共振带,这表明测试润滑脂样品符合弹性流体动力润滑的条件,这些发现通过计算最小油膜厚度得到了证实。
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来源期刊
Tribology Letters
Tribology Letters 工程技术-工程:化工
CiteScore
5.30
自引率
9.40%
发文量
116
审稿时长
2.5 months
期刊介绍: Tribology Letters is devoted to the development of the science of tribology and its applications, particularly focusing on publishing high-quality papers at the forefront of tribological science and that address the fundamentals of friction, lubrication, wear, or adhesion. The journal facilitates communication and exchange of seminal ideas among thousands of practitioners who are engaged worldwide in the pursuit of tribology-based science and technology.
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