The Role of PTFE Lubricant Additives in Enhancing Rolling Contact Fatigue Life

IF 1.9 4区工程技术 Q3 ENGINEERING, CHEMICAL

Lubrication Science Pub Date : 2025-08-05 DOI:10.1002/ls.70003

M. R. Ranju, D. Kesavan

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Abstract

Rolling contact fatigue (RCF) is the default mode of failure observed in Hertzian rolling contact elements, such as bearings. Experimentally, the current study examines the influence of the existence of solid lubricant dispersed in liquid base lubricant on RCF life. Polytetrafluoroethylene (PTFE), a solid lubricant additive, is selected for this purpose, and the RCF performance of varying percentages of PTFE (0.1–2.5 wt%) on the base lubricant has been examined. RCF tests were carried out on a two-disc on-cylinder test rig under pure rolling conditions within the mixed lubrication regime. The RCF life was enhanced for every concentration of PTFE-added lubricant composition. The base lubricant containing 2 wt% PTFE concentration exhibits the highest improvement in mean and L₁₀ RCF life, yielding a 2.3-fold increase in improvement over the base lubricant. The excellent RCF performance is attributed to the decreased wear rate, PTFE particle adsorption and tribo-chemical film formation, and there is a decreased likelihood of metal-to-metal contact and a delayed onset of micropitting.

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PTFE润滑油添加剂对提高滚动接触疲劳寿命的作用

滚动接触疲劳（RCF）是在赫兹滚动接触元件（如轴承）中观察到的默认失效模式。实验研究了分散在液基润滑剂中的固体润滑剂的存在对RCF寿命的影响。为此选择了固体润滑剂添加剂聚四氟乙烯（PTFE），并对基础润滑剂中不同百分比的PTFE （0.1-2.5 wt%）的RCF性能进行了研究。在混合润滑条件下的纯滚动条件下，在双盘缸上进行了RCF试验。添加不同浓度ptfe的润滑油成分均能提高RCF寿命。含2 wt% PTFE浓度的基础润滑剂在平均RCF寿命和L10 RCF寿命方面表现出最高的改善，比基础润滑剂提高了2.3倍。优异的RCF性能归因于磨损率降低，PTFE颗粒吸附和摩擦化学膜的形成，金属与金属接触的可能性降低，微点的发生延迟。

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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.