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Coatings
Special Issues
Protective Coatings for Tribologically Loaded Surfaces: Research Progress and Challenges
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Protective Coatings for Tribologically Loaded Surfaces: Research Progress and Challenges

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Corrosion, Wear and Erosion".

Deadline for manuscript submissions: closed (30 March 2023) | Viewed by 3475

Special Issue Editors

Dr. Florian Pape

E-Mail Website
Guest Editor
Institute of Machine Design and Tribology, Gottfried Wilhelm Leibniz Universität., Hannover, Germany
Interests: Tribochemistry, Tribophysics, Biotribology, Microtribology
Special Issues, Collections and Topics in MDPI journals
Dr. Thomas Hassel

E-Mail Website
Guest Editor
Unterwassertechnikum Hannover, Institut für Werkstoffkunde, Leibniz Universität Hannover (LUH), An der Universität 2, 30823 Garbsen, Germany
Interests: additive manufacturing
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Surfaces that are subjected to tribological loads must be protected against wear and, depending on their application, must have certain frictional properties. In order to further increase performance and reduce energy losses, manufacturing processes and their application are of great importance. This sets the course for better resource savings and paves the way for future industrial development.

This Special Issue focuses on recent advances in protective coatings under tribological loads. Such coatings can be applied, for example, by deposition welding, HVOF spray coating, PVD/CVD/PECVD processes, or can be generated in situ by additives in lubricants under load. Such protective coatings, which form under mechanical stresses, still offer high optimization potential. For example, anti-wear and extreme-pressure additives in lubricants can be supplemented with nanoparticles to further improve them. Also, by using ionic liquids in the lubricant or graphene platelets, a beneficial and conductive protective layer can be obtained. Coatings based on Molybdenum oxides also offer high potential, because a self-regenerating effect in the tribological contact creates favorable transfer films on mating bodies. Wear protection plays a major role in coatings, but their frictional properties must also be regarded. With surfaces in sliding or rolling contacts, reduced frictional surface properties are needed to ensure efficient operation. In the case of coatings intended for power transmission such as synchronizers, on the other hand, high friction values are desired.

In this Special Issue, original research articles and reviews are welcome. Research areas may include (but not limited to) the following:

Recent advances in protective coatings for tribological contacts formed by:

  • Deposition welding;
  • Laser cladding;
  • Plasma-Transferred-Arc welding;
  • HVOF spray coating;
  • PVD/CVD/PECVD processes;
  • AW/EP additives in lubricants

We look forward to receiving your contributions.

Dr. Florian Pape
Dr. Thomas Hassel
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

  • deposition welding
  • laser cladding
  • plasma-transferred-arc welding
  • HVOF spray coating
  • PVD/CVD/PECVD processes
  • AW/EP additives in lubricants

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Published Papers (2 papers)

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Research

20 pages, 26591 KiB  
Article
Investigations on Additively Manufactured Stainless Bearings
by Timm Coors, Mohamad Yusuf Faqiri, Felix Saure, Christoph Kahra, Christoph Büdenbender, Julius Peddinghaus, Vannila Prasanthan, Florian Pape, Thomas Hassel, Sebastian Herbst, Florian Nürnberger, Hendrik Wester, Johanna Uhe, Bernd Breidenstein, Berend Denkena, Bernd-Arno Behrens, Gerhard Poll and Hans Jürgen Maier
Coatings 2022, 12(11), 1699; https://doi.org/10.3390/coatings12111699 - 8 Nov 2022
Cited by 4 | Viewed by 2263
Abstract
Additive manufacturing with multi-material design offers great possibilities for lightweight and function-integrated components. A process chain was developed in which hybrid steel–steel-components with high fatigue strength were produced. For this, a material combination of stainless powder material Rockit® (0.52 wt.% C, 0.9% [...] Read more.
Additive manufacturing with multi-material design offers great possibilities for lightweight and function-integrated components. A process chain was developed in which hybrid steel–steel-components with high fatigue strength were produced. For this, a material combination of stainless powder material Rockit® (0.52 wt.% C, 0.9% Si, 14% Cr, 0.4% Mo, 1.8% Ni, 1.2% V, bal. Fe) cladded onto ASTM A572 mild steel by plasma arc powder deposition welding was investigated. Extensive material characterization has shown that defect-free claddings can be produced by carefully adjusting the welding process. With a tailored heat treatment strategy and machining of the semi-finished products, bearing washers for a thrust cylindrical roller bearing were produced. These washers showed a longer fatigue life than previously produced bearing washers with AISI 52100 bearing steel as cladding. It was also remarkable that the service life with the Rockit® cladding material was longer than that of conventional monolithic AISI 52100 washers. This was reached through a favourable microstructure with finely distributed vanadium and chromium carbides in a martensitic matrix as well as the presence of compressive residual stresses, which are largely retained even after testing. The potential for further enhancement of the cladding performance through Tailored Forming was investigated in compression and forging tests and was found to be limited due to low forming capacity of the material. Full article
(This article belongs to the Special Issue Protective Coatings for Tribologically Loaded Surfaces: Research Progress and Challenges)
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14 pages, 11787 KiB  
Article
Functionality Investigations of Dry-Lubricated Molybdenum Trioxide Cylindrical Roller Thrust Bearings
by Dennis Konopka, Florian Pape, Norman Heimes, Bernd-Arno Behrens, Kai Möhwald and Gerhard Poll
Coatings 2022, 12(5), 591; https://doi.org/10.3390/coatings12050591 - 26 Apr 2022
Cited by 4 | Viewed by 2416
Abstract
In addition to using conventional lubricants, such as oil and grease, rolling bearings can also be used with a dry lubricant. For example, the use of dry lubricant systems is necessary when the application of oils or greases is not possible (e.g., at [...] Read more.
In addition to using conventional lubricants, such as oil and grease, rolling bearings can also be used with a dry lubricant. For example, the use of dry lubricant systems is necessary when the application of oils or greases is not possible (e.g., at high temperatures or in aerospace applications). The requirements of a solid lubricant are to reduce friction and wear of mechanical contact partners. In this work, a molybdenum-based coating system was applied by means of physical vapor deposition (PVD). The coating system consists of a molybdenum (Mo) reservoir with molybdenum trioxide (MoO3) as the top layer. The MoO3, which is particularly important for the run-in and the lubricating effect, is intended to continuously regenerate from the reservoir via tribo-oxidation. To determine the friction and wear behavior, cylindrical roller thrust bearings were used. Experiments demonstrated that the lubrication system is effective and that the frictional behavior has been improved. On the one hand, the frictional torque of the rolling bearings has been considerably reduced and, on the other, significantly extended operating times have been determined compared to unlubricated reference experiments. Simultaneously, material analyses have been carried out by means of scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). The investigations showed that the MoO3 was transferred to uncoated bearing components. This improved the tribological behavior and reduced abrasive and adhesive wear. Full article
(This article belongs to the Special Issue Protective Coatings for Tribologically Loaded Surfaces: Research Progress and Challenges)
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