Preparation, Tribological Behavior, and Applications of Lubricant Additives

A special issue of Lubricants (ISSN 2075-4442).

Deadline for manuscript submissions: 20 April 2025 | Viewed by 8295

Special Issue Editor


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Guest Editor
School of Chemical Engineering, Shanghai Institute of Technology, Shanghai 201418, China
Interests: lubricant additives; tribology; friction; wear; lubricating grease; lubrication; surface and interface

Special Issue Information

Dear Colleagues,

The scientific research, design development and engineering applications of lubricating materials are important to ensure the long life and highly reliable operation of mechanical equipment. Lubricating additives are the essence of lubricating oil, and the comprehensive performance and service characteristics of such oil largely depend on the development of additive technology. The design and preparation of new lubricating additives, the study of tribological properties and mechanisms, and the application of lubricating oil in different domains are the future development direction in this field.

The purpose of this Special issue is to discuss the design and preparation of lubricating additives, tribological properties, and mechanism research, as well as the application of lubricants in different fields and other new developments. It covers material, mechanical, and chemical interactions. Both experimental and theoretical research are welcome.

Dr. Jincan Yan
Guest Editor

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Keywords

  • lubricant additives
  • preparation
  • triblogical behavior
  • application
  • surface and interface technology
  • friction
  • wear
  • lubrication
  • tribology

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Published Papers (4 papers)

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Research

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13 pages, 4564 KiB  
Article
Moringa Oil and Carbon Phases of Different Shapes as Additives for Lubrication
by Nadiège Nomède-Martyr, Philippe Bilas, Grégory Mathieu, Yves Bercion, Henry Joseph and Philippe Thomas
Lubricants 2024, 12(10), 358; https://doi.org/10.3390/lubricants12100358 - 19 Oct 2024
Viewed by 840
Abstract
Vegetable oils in the lubricant field are largely studied. Their efficiency depends on their viscosity parameters and their fatty acid composition. The actions of moringa oil used as a lubricant base and as a lubricant additive have been shown in this work. Graphite, [...] Read more.
Vegetable oils in the lubricant field are largely studied. Their efficiency depends on their viscosity parameters and their fatty acid composition. The actions of moringa oil used as a lubricant base and as a lubricant additive have been shown in this work. Graphite, carbon nanofibers, and carbon nanodots are carbon phases of different shapes used as solid additives. The tribological performances of lubricant blends composed of between 0.5 and 1 wt.% of particles have been evaluated using a ball-on-plane tribometer under an ambient atmosphere. No additional surfactant was used. The positive and important actions of a small amount of moringa oil added in the lubricant formulas are demonstrated. The results obtained allow us to point out the influence of the type and shape of particles. Physicochemical investigations allow us to propose a synergistic effect between the particles and moringa oil as additives in dodecane. Full article
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19 pages, 14430 KiB  
Article
The Preparation of MoS2/Metal Nanocomposites Functionalized with N-Oleoylethanolamine: Application as Lubricant Additives
by Yaping Xing, Zhiguo Liu, Weiye Zhang, Zhengfeng Jia, Weifang Han, Jinming Zhen and Ran Zhang
Lubricants 2024, 12(9), 319; https://doi.org/10.3390/lubricants12090319 - 14 Sep 2024
Viewed by 1016
Abstract
In this study, MoS2 nanosheets have been prepared and treated ultrasonically with silver ammonia solutions. The MoS2/Ag precursor was reduced using dopamine (DA) as reducing and linking agent at room temperature, and it was subjected to a hydrothermal treatment to [...] Read more.
In this study, MoS2 nanosheets have been prepared and treated ultrasonically with silver ammonia solutions. The MoS2/Ag precursor was reduced using dopamine (DA) as reducing and linking agent at room temperature, and it was subjected to a hydrothermal treatment to produce MoS2/Ag nanocomposites (denoted as MoAg). The MoAg samples were functionalized with N-oleoylethanolamine to improve dispersion in the base oil component of additives. Use of the functionalized MoAg (denoted as Fc-MoAg) as a lubricant additive for steel balls resulted in effective friction reduction and anti-wear. This work avoids ion exchange during exfoliation, and the Ag+ has been reduced to nano-silver particles by dopamine to enlarge the layer spaces of MoS2. Taking the case of lubrication with base oil containing Fc-Mo0.6Ag15, the wear scar diameters and coefficients of friction of the steel balls were 0.428 and 0.098 mm, respectively, which were about three-fifths base oil. In addition, MoS2/Cu and MoS2/Ni nanocomposites were synthesized and the tribological properties associated with steel/steel balls assessed. The results demonstrate that all MoS2/metal composites exhibit enhanced tribological behavior in the steel/steel pair tests. Both nanocomposite synergy and the tribofilm containing sulfide, oxide, carbide, and other compounds play important roles in achieving reduced friction and improved anti-wear. The friction and wear properties of base oil containing Fc-MoAg and commercial additives were evaluated using a four-ball wear tester with steel/steel, steel/zirconia and zirconia/zirconia pairs. The base oil containing Fc-MoAg delivered smaller coefficients of friction (COFs) and/or scarring groove depths than those observed with the use of pure base oil and base oil containing commercial additives. Full article
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14 pages, 5321 KiB  
Article
Synergistic Effect of Acrylate of Dialkyl Dithiophosphoric Acid Combined with Molybdenum Dialkyl Dithiocarbamate as Additives in Gear Oil
by Minghao Ding, Yimin Mo, Hong Zhang and Qingchun Liu
Lubricants 2024, 12(5), 165; https://doi.org/10.3390/lubricants12050165 - 9 May 2024
Cited by 2 | Viewed by 1029
Abstract
With the aim of improving the tribological properties of low-viscosity gear oil for automobiles, an acrylate of dialkyl dithiophosphoric acid (ADDP) with strong polar groups was synthesized. The tribological behavior of ADDP combined with molybdenum dialkyl dithiocarbamate (MoDTC) in gear oil was systematically [...] Read more.
With the aim of improving the tribological properties of low-viscosity gear oil for automobiles, an acrylate of dialkyl dithiophosphoric acid (ADDP) with strong polar groups was synthesized. The tribological behavior of ADDP combined with molybdenum dialkyl dithiocarbamate (MoDTC) in gear oil was systematically studied. Tribological performances of gear oil containing different additives were assessed using a four-ball friction and wear tester. The obtained tribological characteristics reveal that ADDP and MoDTC can significantly improve the antiwear and antifriction performance of low-viscosity gear oil. Moreover, compared with using MoDTC or ADDP alone, the average friction coefficient and wear scar diameter of ADDP combined with MoDTC further decreased by 2.41–19.15% and 5.00–18.19%, respectively. Analysis of the worn surface showed that the structural characteristics and physical synergistic lubricating actions of the ADDP with MoDTC additives during the friction process can contribute to the exceptional tribological properties of the hybrid additives. Full article
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Review

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27 pages, 4343 KiB  
Review
Research Progress of Antioxidant Additives for Lubricating Oils
by Deping Xia, Yonggang Wang, Hui Liu, Jincan Yan, Hualin Lin and Sheng Han
Lubricants 2024, 12(4), 115; https://doi.org/10.3390/lubricants12040115 - 31 Mar 2024
Cited by 6 | Viewed by 4601
Abstract
Lubricating oils play an important role in friction-reducing and anti-wear, as well as enhancing mechanical efficiency. To improve the oxidation stability and service life of lubricating oils, the composition and structure of antioxidants should be strategically designed, and these parameters have significantly affected [...] Read more.
Lubricating oils play an important role in friction-reducing and anti-wear, as well as enhancing mechanical efficiency. To improve the oxidation stability and service life of lubricating oils, the composition and structure of antioxidants should be strategically designed, and these parameters have significantly affected the performance of antioxidants in lubricating oils. Antioxidants are classified into two types based on the substrates they act on: peroxide decomposers and radical scavengers. In this review, the effects of peroxide decomposers (including sulfur compounds, phosphorus compounds, sulfur–phosphorus compounds, and sulfur–nitrogen compounds) and radical scavengers, such as hindered phenols and aromatic amines, have been discussed as additives in the antioxidant properties of lubricating oils. The results indicate that peroxide decomposers have excellent performances in lubricating oils, but high pollution of S and P is not conducive to their widespread use. On the contrary, radical scavengers also have superior antioxidant properties and no pollution, possessing the potential to replace traditional antioxidants. In addition, molecular structures with (multiple) synergistic antioxidant properties have been extensively designed and reported. This review serves as a reference for researchers to design and develop high-end new antioxidants. Full article
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