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Lubricants
Special Issues
Tribological Properties of Biolubricants
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Tribological Properties of Biolubricants

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

Deadline for manuscript submissions: 1 July 2025 | Viewed by 2905

Special Issue Editors

Dr. Xin Cui

E-Mail Website
Guest Editor
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China
Interests: grinding; sustainable manufacturing; biolubricants; nano-lubricants; magnetic lubricants
Prof. Dr. Yanbin Zhang

E-Mail Website
Guest Editor
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China
Interests: intelligent manufacturing; sustainable manufacturing; precision machining
Special Issues, Collections and Topics in MDPI journals
Dr. Xiaoliang Liang

E-Mail Website
Guest Editor
School of Mechanical Engineering, Shandong University, Jinan 250061, China
Interests: metal cutting and cutting tools; machined surface integrity; ultra-precision machining
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The limited natural resources and severe environmental issues that humanity is currently facing inherently drive the need for sustainable development in nearly every industry, such as aerospace, marine, automobile engineering, and manufacturing. To eliminate the negative effect of traditional mineral lubricants, the use of biolubricants is widely researched in the tribology and manufacturing fields. Its improved anti-wear and anti-friction performance have been preliminarily verified by experimental studies. Previous studies have also concluded the major influencing factors of tribological properties, including nano-enhancement, molecular structures, physicochemical properties, and so on. Nevertheless, the complex action of biolubricants is indistinct, which limits the preparation of process specifications and their popularity in factories.

The current Special Issue concentrates on the comprehensive assessment of tribological biolubricants based on innovative preparation methods, improved tribological testing, and in-depth mechanism analyses. Then, it attempts to present new perspectives for engineering applications of biolubricants based on the following aspects: (i) the development of raw materials for the preparation of biolubricants, (ii) improvement strategies for lubrication performance from a molecular point of view, (iii) the exploration of green and high-performance additives, (iv) and application guidance for different working conditions, especially extreme conditions such as high temperatures or low temperatures. Contributions are welcome from all scientists working in tribological, chemical, and related areas.

Dr. Xin Cui
Prof. Dr. Yanbin Zhang
Dr. Xiaoliang Liang
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

  • tribological properties
  • biolubricant
  • nano-enhancer
  • preparation
  • fatty acid
  • viscosity
  • surface tension
  • extreme conditions
  • sustainable manufacturing

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Published Papers (3 papers)

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18 pages, 9070 KiB  
Article
Effect of Electroplastic-Assisted Grinding on Surface Quality of Ductile Iron
by Shuo Feng, Dongzhou Jia, Yanbin Zhang, Xiaoqiang Wu, Erkuo Guo, Rui Xue, Taiyan Gong, Haijun Yang, Xiaoxue Li and Xin Jiang
Lubricants 2024, 12(8), 266; https://doi.org/10.3390/lubricants12080266 - 26 Jul 2024
Viewed by 659
Abstract
Ductile iron is a heterogeneous material. The presence of spherical graphite and a hard and brittle structure makes the surface of the workpiece easily form pits and crack defects under harsh grinding conditions, which seriously affects the service life and service performance of [...] Read more.
Ductile iron is a heterogeneous material. The presence of spherical graphite and a hard and brittle structure makes the surface of the workpiece easily form pits and crack defects under harsh grinding conditions, which seriously affects the service life and service performance of the workpiece. The new assisted grinding process based on the electroplastic effect is expected to avoid the surface defects of ductile iron. By comparing the surface roughness and microstructure of conventional grinding and electroplastic-assisted grinding, the superiority of electroplastic-assisted grinding surface quality is confirmed. Further discussion is presented on the impact of grinding parameters on the workpiece’s surface quality under the same electrical parameters. The results show that the sensitivity of surface roughness to grinding parameters from strong to weak is grinding wheel speed, feed speed and grinding depth. The optimal combination of grinding parameters is determined as a grinding wheel speed of 30 m/s, a feed speed of 0.5 m/min and a grinding depth of 10 μm. Full article
(This article belongs to the Special Issue Tribological Properties of Biolubricants)
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15 pages, 5677 KiB  
Article
Assessing the Potential of Bio-Based Friction Modifiers for Food-Grade Lubrication
by Rosa Maria Nothnagel, Guido Boidi, Rainer Franz and Marcella Frauscher
Lubricants 2024, 12(7), 247; https://doi.org/10.3390/lubricants12070247 - 4 Jul 2024
Viewed by 926
Abstract
The objective of this research is to identify a bio-based friction modifier (FM) with tribological performance comparable to conventional FMs. Promising alternatives to conventional FMs, such as the FMs derived from natural sources, including rapeseed and salmon oil, were selected. Increasing concerns about [...] Read more.
The objective of this research is to identify a bio-based friction modifier (FM) with tribological performance comparable to conventional FMs. Promising alternatives to conventional FMs, such as the FMs derived from natural sources, including rapeseed and salmon oil, were selected. Increasing concerns about crude oil prices, environmental impact, and the depletion of fossil resources have further fueled the search for renewable, biodegradable, and environmentally friendly raw materials for lubricants Tribological tests were conducted using a rheometer under non-conformal contact. The normal force, temperature, and sliding speed were varied to simulate conditions such as those found in a food extruder. To simulate cold extrusion applications, water and bio-based FM mixtures were used. The best-performing bio-based FMs were then mixed with a polyalphaolefin to simulate warm extrusion conditions. The results were compared to those obtained from mixtures of a polyalphaolefin and selected conventional FMs. The main finding of this study demonstrated that rapeseed and salmon oils, with a peak coefficient of friction (COF) of 0.16, are the best-performing bio-based FMs for reducing friction. When mixed with distilled water for cold extrusion (case 1) and with polyalphaolefin for warm extrusion (case 2), they performed similarly to the conventional FM, tallow amine, also with a maximum COF of 0.16, and significantly better than polyalphaolefin alone (maximum COF of 0.25). Consequently, rapeseed and salmon oils are suitable bio-based FM candidates to replace conventional FMs in food-grade lubrication. Full article
(This article belongs to the Special Issue Tribological Properties of Biolubricants)
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17 pages, 32215 KiB  
Article
Investigation into the Heat Transfer Behavior of Electrostatic Atomization Minimum Quantity Lubrication (EMQL) during Grinding
by Zhiyong He, Dongzhou Jia, Yanbin Zhang, Da Qu, Zhenlin Lv and Erjun Zeng
Lubricants 2024, 12(5), 158; https://doi.org/10.3390/lubricants12050158 - 30 Apr 2024
Viewed by 904
Abstract
Electrostatic atomization minimum quantity lubrication (EMQL) technology has been developed to address the need for environmentally friendly, efficient, and low-damage grinding of challenging titanium alloy materials. EMQL leverages multiple physical fields to achieve precise atomization of micro-lubricants, enabling effective lubrication in high temperature, [...] Read more.
Electrostatic atomization minimum quantity lubrication (EMQL) technology has been developed to address the need for environmentally friendly, efficient, and low-damage grinding of challenging titanium alloy materials. EMQL leverages multiple physical fields to achieve precise atomization of micro-lubricants, enabling effective lubrication in high temperature, high pressure, and high-speed grinding environments through the use of electric traction. Notably, the applied electric field not only enhances atomization and lubrication capabilities of micro-lubricants but also significantly impacts heat transfer within the grinding zone. In order to explore the influence mechanism of external electric field on spatial heat transfer, this paper first comparatively analyzes the grinding heat under dry grinding, MQL, and EMQL conditions and explores the intensity of the effect of external electric field on the heat transfer behavior in the grinding zone. Furthermore, the COMSOL numerical calculation platform was used to establish an electric field-enhanced (EHD) heat transfer model, clarifying charged particles’ migration rules between poles. By considering the electroviscous effect, the study reveals the evolution of heat transfer structures in the presence of an electric field and its impact on heat transfer mechanisms. Full article
(This article belongs to the Special Issue Tribological Properties of Biolubricants)
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