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Lubricants
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Advances in Tribochemistry
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Advances in Tribochemistry

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

Deadline for manuscript submissions: 31 May 2025 | Viewed by 5318

Special Issue Editors

Dr. José Manuel Liñeira del Río

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Guest Editor
Department of Applied Physics, Faculty of Physics, Institute of Materials (iMATUS), Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
Interests: tribology; nanoparticles; ionic liquids; surface analysis
Dr. Carlos Miguel da Costa Gomes Fernandes

E-Mail Website
Guest Editor
Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal
Interests: power loss; lubricants; polymer gears; tribology; machine elements
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

We would like to invite you to contribute to the Special Issue of Lubricants entitled “Advances in Tribochemistry”. Tribology is the multidisciplinary science of rubbing surfaces. This discipline includes the study of friction, produced wear and surface analysis of surfaces that interact in relative motion; these surfaces can be lubricated by different types of lubricants. Surface interactions that occur between two sliding surfaces are the primary cause of friction and wear. When these surfaces interact, the material exposed on the surfaces reacts with the surrounding environment. The interfaces can be of different types: solid/solid, solid/gas/solid or solid/liquid/solid. Moreover, under certain conditions, chemical reactions could occur within these interfaces and generate a new compound called a Tribofilm, as a result of a tribochemical process. This fact can create different reaction products, which can influence the tribology of the system. Tribochemistry is the study focus on the chemical reactions in different lubricant formulations affecting the tribofilm formation on metal surfaces. The development and application of tribochemistry have grown exponentially in recent years, mainly due to the significant development of surface characterization techniques, with which a large number of interactions can be observed at different levels.

Dr. José Manuel Liñeira del Río
Dr. Carlos Miguel da Costa Gomes Fernandes
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Lubricants is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • tribochemistry
  • lubricants
  • lubricant additives
  • surface characterization
  • friction
  • wear

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Published Papers (3 papers)

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Research

17 pages, 4702 KiB  
Article
Lubricating Greases from Fried Vegetable Oil—Preparation and Characterization
by Olga V. Săpunaru, Ancaelena E. Sterpu, Cyrille A. Vodounon, Jack Nasr, Cristina Duşescu-Vasile, Sibel Osman and Claudia I. Koncsag
Lubricants 2024, 12(6), 197; https://doi.org/10.3390/lubricants12060197 - 30 May 2024
Viewed by 1105
Abstract
Biobased greases are derived from renewable resources, are considered more environmentally friendly, and offer comparable performance to petroleum-based greases. In this study, lubricating greases from frying cooking oils were prepared, thus valorizing waste in order to obtain sustainable and environmentally friendly products. Twelve [...] Read more.
Biobased greases are derived from renewable resources, are considered more environmentally friendly, and offer comparable performance to petroleum-based greases. In this study, lubricating greases from frying cooking oils were prepared, thus valorizing waste in order to obtain sustainable and environmentally friendly products. Twelve batches (500 g each) were produced from sunflower and palm frying oils, with 20% by weight calcium/lithium stearate soaps prepared in situ and filled with 15 wt.% cellulose or lignin sulfate. The greases were rheologically characterized. Their consistency was assessed by the penetration test performed before and after working the greases. Dropping point determinations offered information about the stability at higher temperatures, and oil bleeding tests were performed. The average values of the friction coefficient (COF), the contact resistance, and the wear scar diameter were measured through mechanical tests. The greases prove to be comparable to those obtained from mineral oils, with good rheological properties, soft consistency, and good antiwearing behavior, e.g., in open or total-loss lubricating systems, like in open gears and certain food processing machinery; they are thermally stable andprone touse in low-loading working mechanisms. Full article
(This article belongs to the Special Issue Advances in Tribochemistry)
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19 pages, 5222 KiB  
Article
Engine Oil Degradation in the Real-World Bus Fleet Test Based on Two Consecutive Operational Intervals
by Wojciech Gołębiowski, Artur Wolak and Branislav Šarkan
Lubricants 2024, 12(3), 101; https://doi.org/10.3390/lubricants12030101 - 19 Mar 2024
Cited by 1 | Viewed by 1879
Abstract
The literature on the subject and the results of numerous research experiments indicate that single replacement cycles do not reflect the actual state of oil quality in the context of its degradation. Monitoring the operational quality of the oil in several successive stages [...] Read more.
The literature on the subject and the results of numerous research experiments indicate that single replacement cycles do not reflect the actual state of oil quality in the context of its degradation. Monitoring the operational quality of the oil in several successive stages allows for a more accurate diagnosis of the optimal oil change time. Therefore, it was decided to investigate the relationship between two consecutive periods of changing the operating oil in an engine. Comparative tests of seven buses included in the fleet were carried out. An important division criterion was taken into account—the operation of city and intercity buses. The HDXRF instrumental chemical analysis method was used to determine changes in the content of abrasive metals, and additives in engine oils. Additionally, the oxidation, nitration, sulfonation, and soot content were assessed using infrared spectroscopy (FTIR) based on the ASTM E2414-10 standard and kinematic viscosity at 40 °C and 100 °C using a Stabinger viscometer according to ASTM D7042. The course of these changes was analyzed in terms of their dynamics. The comparative study aimed to identify trends and sources of differences between the tested oils, as well as to demonstrate the number of exceedances of limit values for the selected parameters. Full article
(This article belongs to the Special Issue Advances in Tribochemistry)
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16 pages, 16443 KiB  
Article
Tribological Improvement of Low-Viscosity Nanolubricants: MoO3, MoS2, WS2 and WC Nanoparticles as Additives
by José M. Liñeira del Río, Carlos M. C. G. Fernandes and Jorge H. O. Seabra
Lubricants 2024, 12(3), 87; https://doi.org/10.3390/lubricants12030087 - 10 Mar 2024
Cited by 3 | Viewed by 1797
Abstract
The aim of this research is studying the tribological performance of MoO3, MoS2, WS2 and WC nanoparticles as additives of PAO4. Pure sliding tribological tests were performed at 120 °C, finding outstanding friction and wear reductions in comparison [...] Read more.
The aim of this research is studying the tribological performance of MoO3, MoS2, WS2 and WC nanoparticles as additives of PAO4. Pure sliding tribological tests were performed at 120 °C, finding outstanding friction and wear reductions in comparison with the PAO4, with maximum friction reductions of 64% for the 0.1 wt% MoS2 nanolubricant and greatest wear decreases for 0.1 wt% MoS2 nanolubricant: a width reduction of 62% and a worn area decrease of 97%. Raman mapping and a roughness evaluation of the worn pins confirmed the tribofilm formation and mending as tribological mechanisms. Rolling–sliding tests were conducted with best nanolubricants performance in pure sliding, observing excellent antifriction capabilities of MoS2 nanoparticles at low speeds, indicating that the use of nanoparticles is vital in boundary lubrication. Full article
(This article belongs to the Special Issue Advances in Tribochemistry)
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