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Coatings
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Self-Lubricating Materials and Coatings
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Self-Lubricating Materials and Coatings

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Liquid–Fluid Coatings, Surfaces and Interfaces".

Deadline for manuscript submissions: closed (30 April 2024) | Viewed by 5588

Special Issue Editors

Dr. Adam Piasecki

E-Mail Website
Guest Editor
Faculty of Materials Engineering and Technical Physics, Institute of Materials Science and Engineering, Poznan University of Technology, Poznan, Poland
Interests: self-lubricating surface layers; self-lubricating material; solid lubricants; sintered materials; metal matrix composite materials and coatings; microstructure and properties modification of surface layers; tribology; wear of materials; spark plasma sintering (SPS); scanning electron microscopy (SEM); energy dispersive X-ray spectroscopy (EDS)
Special Issues, Collections and Topics in MDPI journals
Dr. Mateusz Kotkowiak

E-Mail Website
Guest Editor
Faculty of Materials Engineering and Technical Physics, Institute of Materials Science and Engineering, Poznan University of Technology, Poznan, Poland
Interests: self-lubricating material; self-lubricating coatings; sintered materials; metal matrix composite; wear; friction; lubrication

Special Issue Information

Dear Colleagues,

Frictional wear is the main cause of wear on machine parts and tools. It is estimated to be responsible for 80% of breakdowns. Approximately 30% of energy is used to overcome frictional resistance. Annual economic losses due to friction wear account for almost 2% of national GDP. Therefore, studies on friction and the search for new materials, including lubricating oils, greases, and solid lubricants, are a topical issue of important social and economic interest. With developing industry and modern production technologies, requirements for wear strength under demanding operating conditions, such as high speeds, high loads, high vacuum, radiation, and operating temperature range, are increasing. For scientists and manufacturers alike, this means a search for new materials and the modification of their surfaces by appropriate treatments. Currently, an intense search is underway for self-lubricating materials and coatings. These include, among others, powder metallurgy, laser alloying, thermal spraying, and PVD and CVD techniques.

We invite researchers to contribute to this Special Issue entitled Self-Lubricating Materials and Coatings, which is intended to serve as a unique multidisciplinary forum focused on the production, properties, and applications of self-lubricating coatings and materials. In particular, topics of interest include, but are not limited to:

  • manufacturing methods for self-lubricating coatings and materials;
  • coatings produced by different processes, including additive manufacturing processes, thermal spray, laser and plasma processing, PVD, CVD, plating, etc.;
  • microstructural analysis of self-lubricating coatings and materials;
  • wear mechanism of self-lubricating coatings and materials;
  • wear resistance of self-lubricating coatings and materials.

Dr. Adam Piasecki
Dr. Mateusz Kotkowiak
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. Coatings 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

  • self-lubricating coating
  • self-lubricating surface layers
  • self-lubricating materials
  • self-lubricating composites
  • self-lubricating sinters
  • solid lubricant
  • wear resistance
  • wear mechanism
  • tribofilm

Published Papers (2 papers)

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Research

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10 pages, 1867 KiB  
Article
A Study on the Tribological Behavior of Molybdenum Disulfide Particles as Additives
by Filip Ilie and Andreea-Catalina Cristescu
Coatings 2022, 12(9), 1244; https://doi.org/10.3390/coatings12091244 - 25 Aug 2022
Cited by 5 | Viewed by 1479
Abstract
Molybdenum disulfide (MoS2) is used as a solid lubricant and is well known for its tribological behavior (friction and wear). The tribological properties of the lubricating oil–MoS2 nanoparticles mixture in different conditions of friction are studied using a four-ball tribometer, [...] Read more.
Molybdenum disulfide (MoS2) is used as a solid lubricant and is well known for its tribological behavior (friction and wear). The tribological properties of the lubricating oil–MoS2 nanoparticles mixture in different conditions of friction are studied using a four-ball tribometer, and the operating conditions of the four balls when immersed can be modeled. The current paper presents a calculating method for the critical sliding velocity (ωcr) and friction maximum torque (Mfmax) depending on the temperature (T) from the contact areas, obviously demonstrating low tribological performances. The film composition formed by friction, the topography, and the morphology of the particles and the friction-and-wear tracks of the balls following experiments using contact surfaces are analyzed and investigated by X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscope (TEM). XPS and SEM show that nanoparticles by deposition form a protective and lubricating layer of MoS3, which allows for an increase in the friction pair’s load capacity. MoS2 nanoparticles (n-MoS2 of ~40 nm in diameter) compared to the common (commercial) MoS2 particles (c-MoS2 of ~1.5 μm in diameter) presented lower friction coefficients and higher wear-resistance values, due to the protective-layer microstructure as an intermediate lubricant between the contact surfaces. Therefore, the present paper reports the tribological properties of the lubricating oil with n-MoS2 as an additive compared to the c-MoS2, and by the application of the friction modeling theory using a Couette flow, it was possible to calculate the temperature, T, when the friction torque, Mf, was at its maximum, the basis on which the value of its sliding velocity, ω, was obtained corresponding to the contact areas of the four-ball system. Full article
(This article belongs to the Special Issue Self-Lubricating Materials and Coatings)
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Review

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34 pages, 5417 KiB  
Review
Durability of Slippery Liquid-Infused Surfaces: Challenges and Advances
by Divyansh Tripathi, Prauteeto Ray, Ajay Vikram Singh, Vimal Kishore and Swarn Lata Singh
Coatings 2023, 13(6), 1095; https://doi.org/10.3390/coatings13061095 - 13 Jun 2023
Cited by 19 | Viewed by 3615
Abstract
Slippery liquid-infused porous surfaces (SLIPS) have emerged as a unique approach to creating surfaces that can resist fouling when placed in contact with aqueous media, organic fluids, or biological organisms. These surfaces are composed of essentially two components: a liquid lubricant that is [...] Read more.
Slippery liquid-infused porous surfaces (SLIPS) have emerged as a unique approach to creating surfaces that can resist fouling when placed in contact with aqueous media, organic fluids, or biological organisms. These surfaces are composed of essentially two components: a liquid lubricant that is locked within the protrusions of a textured solid due to capillarity. Drops, immiscible to the lubricant, exhibit high mobility and very-low-contact-angle hysteresis when placed on such surfaces. Moreover, these surfaces are shown to resist adhesion to a wide range of fluids, can withstand high pressure, and are able to self-clean. Due to these remarkable properties, SLIPS are considered a promising candidate for applications such as designing anti-fouling and anti-corrosion surfaces, drag reduction, and fluid manipulation. These collective properties, however, are only available as long as the lubricant remains infused within the surface protrusions. A number of mechanisms can drive the depletion of the lubricant from the interior of the texture, leading to the loss of functionality of SLIPS. Lubricant depletion is one challenge that is hindering the real-world application of these surfaces. This review mainly focuses on the studies conducted in the context of enhancing the lubricant retention abilities of SLIPS. In addition, a concise introduction of wetting transitions on structured as well as liquid-infused surfaces is given. We also discuss, briefly, the mechanisms that are responsible for lubricant depletion. Full article
(This article belongs to the Special Issue Self-Lubricating Materials and Coatings)
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