A Quantitative Method to Measure Oil-Separation Properties of Lubricating Greases

IF 2.9 3区工程技术 Q2 ENGINEERING, CHEMICAL

Tribology Letters Pub Date : 2024-08-05 DOI:10.1007/s11249-024-01900-1

Femke Hogenberk, Dirk van den Ende, Matthijn B. de Rooij, Piet M. Lugt

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Abstract

The oil-separation properties of lubricating greases are responsible for transporting base oil to the bearing contacts. Therefore, a good understanding of these properties is necessary to predict grease life based on physical grease properties. Currently, oil separation for small, aged grease samples collected from bearings, is studied using so-called maintenance tools. These tools give qualitative insight into the grease properties, e.g., increases or decreases in oil separation after ageing of the grease. In this work, a quantitative, lab-scale method to study oil separation is presented. Using this method, the amount of base oil transferred from a grease sample to a piece of blotting paper is measured based on the difference in light transmission through the oil stain and the dry paper. Translation of transmitted light intensity to oil concentration is accomplished using a modified Lambert-Beer’s law. This enables the determination of the instantaneous bleed rate and oil content. In combination with a physical model, this method can help to improve the understanding of the driving forces behind oil separation, e.g., the affinity pressure and permeability.

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测量润滑脂油分离特性的定量方法

润滑脂的析油特性负责将基础油输送到轴承接触点。因此，要根据润滑脂的物理特性预测其使用寿命，就必须充分了解这些特性。目前，我们使用所谓的维护工具来研究从轴承中采集的小块老化润滑脂样本的油分离特性。这些工具可以定性地了解润滑脂的特性，例如润滑脂老化后油分离度的增加或减少。在这项工作中，介绍了一种实验室规模的油分离定量研究方法。使用这种方法，可以根据通过油渍和干纸的透光率差异，测量从油脂样本转移到吸油纸上的基础油量。透射光强度与油脂浓度之间的关系是通过修改后的朗伯-比尔定律来实现的。这样就能确定瞬时渗漏率和含油量。结合物理模型，这种方法有助于更好地理解油分离背后的驱动力，例如亲和压和渗透性。

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来源期刊

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.