Layered Rare Earth Sulfates as Solid Lubricants for Enhancing Grease’s High Extreme-Pressure Performance

IF 2.9 3区工程技术 Q2 ENGINEERING, CHEMICAL

Tribology Letters Pub Date : 2025-05-13 DOI:10.1007/s11249-025-02010-2

Xiaosheng Zhang, Xuexue He, Chong Ma, Xiaowei Kong, Gangsen Li, Li Qiao, Yanfei Zhang, Kangwei Li, Jingyi Ma, Yuewei Zheng, Lei Liu

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Abstract

Developing and utilizing high-extreme pressure (EP) performance solid lubricants has become imperative to meet the lubrication requirements for harsh operating conditions. Based on the action mechanism of rare earth on alloys, the influence of material corrugated layered crystal structure, and sulfur content on lubrication properties at the atomic and molecular levels, layered rare earth sulfates have become a new type of high EP performance solid lubricants. Herein, we prepared layered rare earth sulfate materials (RE₂(OH)₄SO₄·nH₂O, RE = La/Sm/Ce, i.e., RES, LaS, SmS, CeS, respectively) using a mild hydrothermal method for controlled particle size and morphology. To evaluate its applicability, we tested the new solid lubricants against high load, high temperature, long-term, different friction pair materials, and fretting. Overall, the RES samples exhibited excellent lubricating behavior when added to polyurea grease, better than MoS₂. By adding layered lanthanum sulfate, samarium sulfate, and cerium sulfate, the seizure loads can reach up to 1400, 1300, and 1300 N, respectively. Microscopic analysis of the friction pairs confirmed that the lubricating films formed on the worn surface during friction. Excitingly, the RES materials exhibited excellent synergistic effects on EP performance and corrosion resistance. Thus, these materials have broad application prospects as lubricants.

Graphical Abstract

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层状稀土硫酸盐作为固体润滑剂提高润滑脂的高压性能

开发和利用高极压（EP）性能固体润滑剂已成为满足恶劣工况润滑要求的必要条件。基于稀土对合金的作用机理、材料波纹层状晶体结构以及硫含量对合金在原子和分子水平上的润滑性能的影响，层状稀土硫酸盐已成为一种新型的高EP性能固体润滑剂。本文采用温和水热法制备了层状稀土硫酸盐材料（RE2(OH)4SO4·nH2O, RE = La/Sm/Ce，分别为RES、LaS、SmS、CeS）。为了评估其适用性，我们对新型固体润滑剂进行了高负荷、高温、长期、不同摩擦副材料和微动的测试。总的来说，RES样品在加入聚脲脂时表现出优异的润滑性能，优于MoS2。添加层状硫酸镧、硫酸钐和硫酸铈后，吸附载荷分别可达1400、1300和1300 N。对摩擦副的微观分析证实，摩擦过程中磨损表面形成了润滑膜。令人兴奋的是，RES材料在EP性能和耐腐蚀性方面表现出优异的协同效应。因此，这些材料作为润滑剂具有广阔的应用前景。图形抽象

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.