A Lithium Stearate and Fumed Silica Co-Thickened Grease With Poly(Sodium-4-Styrenesulfonate) Additive for Electric Vehicles

IF 1.9 4区工程技术 Q3 ENGINEERING, CHEMICAL

Lubrication Science Pub Date : 2025-07-27 DOI:10.1002/ls.70005

Saswat Gautam, Sruthi Huligujje, Linto Davis, Ramkumar Penchaliah, Abhijit P. Deshpande

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Abstract

In this study, lithium stearate and fumed silica co-thickened grease with po-ly(sodium-4-styrenesulfonate) (PSSNa) additive was synthesised and characterised for application as an automotive lubricant, including for the potential use in an electric vehicle (EV). Oscillatory shear and steady shear rheological tests confirmed that the sample exhibited appropriate shear thinning required in greases. Fumed silica was found to increase thermal stability. Additionally, the conductivity of the synthesised grease was higher than the threshold conductivity required to avoid electrical arcing and static charge buildup (4 × 10⁻¹² S/cm). The tribo-pair lubricated with LSFSPNa grease demonstrated a significant improvement in tribological performance, with the coefficient of friction reduced by approximately 65% compared to commercial grease, decreasing from 0.31 to 0.11. The wear volume showed a tenfold reduction, accompanied by a substantial decrease in surface roughness (Ra), which dropped from 0.81 μm with commercial grease to 0.17 μm with LSFSPNa grease. At the same time, the synthesised grease exhibited better copper corrosion resistance. Overall, the synthesised grease was found to be compatible for EV applications in terms of rheology, friction reduction, copper corrosion resistance, conductivity, and thermal stability.

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电动汽车用硬脂酸锂和气相二氧化硅共增稠润滑脂与聚（4-苯乙烯磺酸钠）添加剂

在这项研究中，硬脂酸锂和气相二氧化硅共增稠润滑脂与聚（4-苯乙烯磺酸钠）（PSSNa）添加剂被合成和表征应用作为汽车润滑剂，包括在电动汽车（EV）的潜在用途。振荡剪切和稳定剪切流变试验证实，样品表现出润滑脂所需的适当剪切减薄。气相二氧化硅被发现可以增加热稳定性。此外，合成润滑脂的电导率高于避免电弧和静电荷积聚所需的电导率阈值（4 × 10−12 S/cm）。使用LSFSPNa润滑脂润滑的摩擦副摩擦学性能得到了显著改善，与商用润滑脂相比，摩擦系数降低了约65%，从0.31降至0.11。磨损量减小了10倍，同时表面粗糙度（Ra）也大幅降低，从商用润滑脂的0.81 μm降至LSFSPNa润滑脂的0.17 μm。同时，合成的润滑脂具有较好的耐铜腐蚀性能。总的来说，合成的润滑脂在流变学、减少摩擦、铜耐腐蚀性、电导率和热稳定性方面与电动汽车应用相兼容。

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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.