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Coatings
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Coatings for Tribological Applications
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Coatings for Tribological Applications

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Tribology".

Deadline for manuscript submissions: closed (1 December 2022) | Viewed by 3683

Special Issue Editors

Dr. Emmanuel P. Georgiou

E-Mail Website
Guest Editor
Falex Tribology, 3110 Rotselaar, Belgium
Interests: friction; wear; electrodeposition; lubrication; nanocomposites
Special Issues, Collections and Topics in MDPI journals
Dr. Dirk Drees

E-Mail Website
Co-Guest Editor
Falex Tribology, 3110 Rotselaar, Belgium
Interests: friction; wear; coatings; lubrication; sustainability

Special Issue Information

Dear Colleagues,

Nowadays, coatings are extensively applied to mitigate the adverse effects of friction and wear in machine components. Examples can be found in a variety of technological and industrial fields, such as biomedical, electrical, energy, transport, etc. Depending on the applications, quite diverse contact conditions (e.g., speeds, loads, motion, environment) can be met. Therefore, it is extremely important to treat every tribo-system in a unique way and try to evaluate its behaviour under relevant application conditions.

This Special Issue focuses on the use of coatings for tribological applications. The topics of interest for this Special Issue, in particular, include (but are not restricted to):

  • The successful use of coatings in demanding tribological applications, particularly related to sustainability issues (energy production, electrical vehicles, waste reduction);
  • The use of coatings to reduce wear and improve friction;
  • New tribological methods to study industrial problems on the lab scale;
  • Friction and wear mechanisms in coated systems;
  • Other aspects of tribological coatings are also welcome.

Dr. Emmanuel P. Georgiou
Dr. Dirk Drees
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

  • friction reduction
  • wear mechanisms
  • coatings for tribological applications
  • tribo-testing
  • industrial applications

Published Papers (2 papers)

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Research

16 pages, 6172 KiB  
Article
Enhancement of Tribological Properties of Cubic and Hexagonal Boron Nitride Nanoparticles Impregnated on Bearing Steel via Vacuum Heat Treatment Method
by Vrushali Yogesh Bhalerao and Sanjay Shridhar Lakade
Coatings 2022, 12(12), 1940; https://doi.org/10.3390/coatings12121940 - 9 Dec 2022
Cited by 1 | Viewed by 1513
Abstract
In the current world of coatings and nanomaterials, specifically bearings, zinc, chromium, nickel, diamond-like coatings, and molybdenum disulfide are being used, to name but a few. Boron nitride in various forms has been used to enhance the surface properties, such as hardness, wear [...] Read more.
In the current world of coatings and nanomaterials, specifically bearings, zinc, chromium, nickel, diamond-like coatings, and molybdenum disulfide are being used, to name but a few. Boron nitride in various forms has been used to enhance the surface properties, such as hardness, wear resistance, and corrosion resistance of dies, tools, etc. In this paper, a significant focus is being given to the improvement of the surface properties of bearing-steel materials by the impregnation of cubic and hexagonal boron nitride nanoparticles. The vacuum heat treatment method is used for treating the sample pins of material equivalents to EN31. In the design of the experiments, the Taguchi method with L27 orthogonal array is used for the optimization of various parameters, such as the weight % of c-BN and h-BN nanoparticles and the temperature of the vacuum treatment. With the help of preliminary experimentation, the three levels of three parameters are decided. The microhardness analysis shows an improvement from 321 HV0.1 to 766 HV0.1 for a 50 µm case depth of nanoparticle impregnation. The evaluation of the influence of selected factors is also performed using ANOVA and the S/N ratio, and it was revealed that hex boron nitride (h-BN) affects the microhardness value more than the other two factors. The friction and wear testing reveal that the wear properties are improved by approximately 1.6 times, and the frictional force also decreases by approx. 1.4 times. Scanning electron microscope (SEM) analysis shows that the nanoparticles are penetrated by 21.09% and 46.99% atomic weight. In addition, a reduction in the friction coefficient and better wear response were achieved as a result of the heat treatment with nanoparticle impregnation. Full article
(This article belongs to the Special Issue Coatings for Tribological Applications)
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11 pages, 26395 KiB  
Article
High Performance Accelerated Tests to Evaluate Hard Cr Replacements for Hydraulic Cylinders
by Emmanuel P. Georgiou, Dirk Drees, Greet Timmermans, Alexandros Zoikis-Karathanasis, Marta Pérez-Fernández, Luca Magagnin and Jean-Pierre Celis
Coatings 2021, 11(12), 1511; https://doi.org/10.3390/coatings11121511 - 8 Dec 2021
Cited by 3 | Viewed by 2454
Abstract
To prolong the lifetime of hydraulic cylinders, a wear-resistant low-friction surface is required. Until now, hard Cr coatings were the best materials for this. However, in recent years, there has been an increasing pressure on the manufacturing of hard Cr plating and plated [...] Read more.
To prolong the lifetime of hydraulic cylinders, a wear-resistant low-friction surface is required. Until now, hard Cr coatings were the best materials for this. However, in recent years, there has been an increasing pressure on the manufacturing of hard Cr plating and plated products, because of environmental and health hazards. The replacement of these coatings by alternatives has not been highly successful yet, because it requires extensive component testing, which is costly and time-consuming and thus not appropriate for material development. For this reason, there is a high need to develop tribological methods that simulate hydraulic cylinders’ component-testing closely. In addition, these new methods should also provide additional information (e.g., friction evolution) that can assist in the further development and optimization of alternative coatings. Having the above in mind and building on an existing method from the American Society for Testing and Materials (ASTM G133), a new test method that allows users to test directly on hydraulic cylinders was developed. This method can provide a relative ranking of both the wear resistance and frictional performance of alternative coatings in direct comparison to state-of-the-art hard Cr. Importantly, the method is repeatable and has a much shorter test duration than full-scale component tests, thereby accelerating material development significantly. Full article
(This article belongs to the Special Issue Coatings for Tribological Applications)
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