Research on the tribological properties of kaolin/MoDDP composite lubricant additives under heavy load and impact conditions

IF 1.9 4区工程技术 Q3 ENGINEERING, MECHANICAL

Industrial Lubrication and Tribology Pub Date : 2025-01-08 DOI:10.1108/ilt-09-2024-0331

Lei Wang, Xinming Wang, Liang Li, Chuang Yang, Yuqin Zhu

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引用次数: 5

Abstract

Purpose With respect to severe working conditions such as heavy load and impact, this paper aims to investigate the friction reduction and anti-wear performance of kaolin and molybdenum dialkyl dithiophosphate (MoDDP) composite lubricant additives to improve the lubrication effect of a single additive. Design/methodology/approach A four-ball friction test was carried out to determine the optimal concentration of kaolin and organic molybdenum additives and the tribological properties of the kaolin/MoDDP composite lubricant additives. A ring block test of composite lubricant additives was designed to investigate its lubrication performance under the severe working conditions of low speed, heavy load and impact. Findings The results showed that the optimal addition mass fractions of kaolin and MoDDP were 4.0 and 1.5 Wt.%, respectively, when kaolin and MoDDP were used as single lubricant additives. Compared with the single additive, the 4.0 Wt.% kaolin/1.5 Wt.% MoDDP composite lubricant additive showed excellent friction reduction and anti-wear effects under heavy load and impact conditions. Physicochemical analysis of the wear surface revealed that the lamellar kaolin additive and MoDDP had excellent synergistic effects, and the friction process promoted the generation of lubricant films containing a chemically reactive layer of MoS 2 , MoO 2 , FeS 2 and Fe 2 O 3 and a physically adsorbent layer containing SiO 2 and Al 2 O 3 , which play important roles in anti-wear and friction reduction. Originality/value The excellent friction reduction and anti-wear effects of lamellar silicate minerals and the excellent antioxidant properties and good synergistic effects of molybdenum were comprehensively used to develop the composite additives with great lubricating properties.

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高岭土/MoDDP复合润滑添加剂在重载和冲击条件下的摩擦学性能研究

目的针对重载、冲击等恶劣工况，研究高岭土与二烷基二硫代磷酸钼（MoDDP）复合润滑添加剂的减摩抗磨性能，以提高单一添加剂的润滑效果。设计/方法/方法通过四球摩擦试验，确定高岭土和有机钼添加剂的最佳添加浓度以及高岭土/MoDDP复合添加剂的摩擦学性能。设计了复合润滑添加剂环块试验，研究了复合润滑添加剂在低速、重载、冲击等恶劣工况下的润滑性能。结果表明，当高岭土和MoDDP作为单一润滑剂添加剂时，高岭土和MoDDP的最佳添加质量分数分别为4.0 Wt.%和1.5 Wt.%。与单一添加剂相比，4.0 Wt.%高岭土/1.5 Wt.% MoDDP复合添加剂在重载和冲击条件下表现出优异的减摩和抗磨效果。对磨损表面的理化分析表明，层状高岭土添加剂与MoDDP具有良好的协同作用，摩擦过程促进了含有MoS 2、MoO 2、FeS 2和fe2o3的化学反应层和含有sio2和al2o3的物理吸附层的润滑膜的生成，具有重要的抗磨减摩作用。综合利用层状硅酸盐矿物优异的减摩抗磨效果和钼优异的抗氧化性能和良好的协同作用，研制出具有良好润滑性能的复合添加剂。

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来源期刊

Industrial Lubrication and Tribology 工程技术-工程：机械

CiteScore

3.00

自引率

18.80%

发文量

129

审稿时长

1.9 months

期刊介绍： Industrial Lubrication and Tribology provides a broad coverage of the materials and techniques employed in tribology. It contains a firm technical news element which brings together and promotes best practice in the three disciplines of tribology, which comprise lubrication, wear and friction. ILT also follows the progress of research into advanced lubricants, bearings, seals, gears and related machinery parts, as well as materials selection. A double-blind peer review process involving the editor and other subject experts ensures the content''s validity and relevance.