Thin Films for Tribological Applications

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

Deadline for manuscript submissions: 15 October 2024 | Viewed by 5826

Special Issue Editors


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Guest Editor
Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal
Interests: biopotental; biomedical device; biosignal; biomedical engineering; electrode; dry electrode
Xinyu Key Laboratory of Materials Technology and Application for Intelligent Manufacturing, Xinyu University, Xinyu 338004, China
Interests: wear; friction; tribological applications; coatings; wear resistant coating; engine; cylinder liner; piston ring; surface treatment

Special Issue Information

Dear Colleagues,

In automotive, aerospace, and other industries, many parts of different machines will experience wear in various forms. Surface treatment can effectively solve the wear problem, and coatings are widely used.  Consequently, over the past few decades, extensive research has focused on understanding wear behavior of the surface and proposing more effective treatment.

Therefore, we would like to invite you to submit your original research to this Coatings Special Issue entitled “Thin Films for Tribological Applications”. The goal of this Special Issue is to include all aspects of research related to surface for tribological applications and wear-resistant coatings, including theoretical and application-oriented papers, experimental and numerical studies, case studies, and reviews.

We encourage you to send manuscripts containing scientific findings within the broad fields of coatings and tribology. In particular, the topics of interest include but are not limited to:

  • Wear;
  • Friction;
  • Tribology;
  • Wear resistance;
  • Coatings;
  • Surface treatment;
  • Thin films.

Dr. José Carlos Fonseca
Dr. Chengdi Li
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

  • wear
  • friction
  • tribology
  • wear resistance
  • coatings
  • surface treatment
  • thin films

Published Papers (4 papers)

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Research

17 pages, 9883 KiB  
Article
Investigation of Graphene Platelet-Based Dry Lubricating Film Formation in Tribological Contacts
by Florian Pape
Coatings 2024, 14(3), 360; https://doi.org/10.3390/coatings14030360 - 18 Mar 2024
Viewed by 1115
Abstract
Dry lubricants used in highly loaded rolling bearings are in the focus of current research. In previous studies, graphene platelets applied as dry lubricants on the surfaces of angular contact ball bearings demonstrated superior properties. These specific bearings, experiencing both rolling and spinning [...] Read more.
Dry lubricants used in highly loaded rolling bearings are in the focus of current research. In previous studies, graphene platelets applied as dry lubricants on the surfaces of angular contact ball bearings demonstrated superior properties. These specific bearings, experiencing both rolling and spinning motion, create more severe conditions for dry lubricants. To gain deeper insights into the lubrication effects, micro-tribological studies were carried out on the respective film formation and running behavior effects. In the tests, a fixed steel ball slid against an oscillating counterpart under a defined load. During the measurements, the applied load and tangential forces on the ball were recorded to calculate the friction. Comparative investigations included nano-graphite particles and fullerene as dry lubricants, in addition to graphene platelets of various staple thicknesses. To increase the adhesion of the films to the surfaces, a pre-rolling process was implemented. Afterwards, the friction on the compressed films was measured. The results indicate that the pre-rolling process effectively reduces the friction of the system. After testing, the surfaces underwent analysis using laser scanning microscopy to assess the formed films, wear, and material transfer. It has been demonstrated that the pre-rolling process leads to the formation of a very thin compacted film with surface protective properties. With the ball as a counterpart, the graphene platelets generate a transfer film on the contacting surface. Full article
(This article belongs to the Special Issue Thin Films for Tribological Applications)
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11 pages, 7048 KiB  
Article
Tribological Performance and Scuffing Resistance of Cast-Iron Cylinder Liners and Al-Si Alloy Cylinder Liners
by Chengdi Li, Xiao Chen, Hao Liu, Lianjie Dong, Huihua Jian, Jingsi Wang and Fengming Du
Coatings 2023, 13(11), 1951; https://doi.org/10.3390/coatings13111951 - 15 Nov 2023
Cited by 2 | Viewed by 837
Abstract
In order to better determine the applicable working conditions of Al-Si alloy cylinder liners and cast-iron cylinder liners, their tribological performance and scuffing resistance are discussed in this paper. After wear and scuffing tests, it was found that cast-iron cylinder liners had better [...] Read more.
In order to better determine the applicable working conditions of Al-Si alloy cylinder liners and cast-iron cylinder liners, their tribological performance and scuffing resistance are discussed in this paper. After wear and scuffing tests, it was found that cast-iron cylinder liners had better wear resistance and better scuffing resistance, but poor friction performance. Al-Si alloy cylinder liners had weaker wear resistance and scuffing resistance, but excellent friction performance. The wear mechanism of cast-iron cylinder liners is slight adhesive wear, and they are suitable for traditional fuel engines and turbocharged engines with high load, high power, and high stability. The wear mechanism of Al-Si alloy cylinder liners was a mixture of adhesive wear and abrasive wear, and they are suitable for engines that are lightweight, efficient, and energy-saving, and operate at high speeds. Full article
(This article belongs to the Special Issue Thin Films for Tribological Applications)
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18 pages, 16222 KiB  
Article
Friction Sensitivity Test Experiment and Desensitization Mechanism of Nitrocellulose-Coated DNTF Explosive Crystals
by Junming Yuan, Yue Qin, Yan Liu, Hu Sun, Runsheng Huang, Jing Wang, Tao Han and Ruiqiang Wu
Coatings 2023, 13(10), 1721; https://doi.org/10.3390/coatings13101721 - 01 Oct 2023
Viewed by 1135
Abstract
In response to the problem of the high friction sensitivity of 3,4-bis(3-nitrofurazan-4-yl) furoxan (DNTF) in solid propellants, the inherent component of solid propellants, nitrocellulose (NC), was used to coat DNTF explosives via the water suspension method. The coated samples were characterized by scanning [...] Read more.
In response to the problem of the high friction sensitivity of 3,4-bis(3-nitrofurazan-4-yl) furoxan (DNTF) in solid propellants, the inherent component of solid propellants, nitrocellulose (NC), was used to coat DNTF explosives via the water suspension method. The coated samples were characterized by scanning electron microscopy (SEM) and friction sensitivity tests at a fixed 66° swing angle, and molecular dynamics calculations were performed to study the friction sensitivity and desensitization mechanism of NC-based DNTF coatings. The results show that NC, when used as a coating layer, can form a white gel on the surface of DNTF crystals, which can effectively reduce the friction sensitivity of DNTF. The coating effect becomes more obvious as the NC content increases. When the NC content is 5%, the friction sensitivity decreases by 72%, and a prediction formula for the exponential decay of DNTF friction sensitivity is obtained. MD calculation data show that NC can weaken the stiffness, enhance the elastic-plastic properties, increase the ductility and toughness of DNTF materials, and effectively improve the mechanical properties of DNTF. By combining experiments and simulation calculations, while considering the compatibility of new components and changes in propellant energy and other unpredictable new issues, NC can be referred to as a better coating layer for DNTF, as it has a certain feasibility for improving the friction sensitivity of DNTF. Full article
(This article belongs to the Special Issue Thin Films for Tribological Applications)
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17 pages, 11359 KiB  
Article
Correlation between Lubricating Oil Characteristic Parameters and Friction Characteristics
by Yanshuang Wang, Qingguo Qiu, Pu Zhang, Xudong Gao, Zhen Zhang and Pengcheng Huang
Coatings 2023, 13(5), 881; https://doi.org/10.3390/coatings13050881 - 08 May 2023
Cited by 2 | Viewed by 2172
Abstract
In order to help one to judge the friction properties of lubricating oils without tests, this paper intends to establish the correlation between the characteristic parameters of lubricating oils and the friction properties. The elastohydrodynamic and boundary friction properties of poly alpha olefin [...] Read more.
In order to help one to judge the friction properties of lubricating oils without tests, this paper intends to establish the correlation between the characteristic parameters of lubricating oils and the friction properties. The elastohydrodynamic and boundary friction properties of poly alpha olefin (PAO) synthetic oil, polyol ester oil and paraffin-based mineral oil were tested using a Mini-Traction Machine. Fourier transform infrared microscopy is used to identify material changes before and after friction tests. The kinematic and dynamic viscosities of the three lubricating oils were measured using a petroleum product viscosity tester and a rotating rheometer. The results show that the kinematic viscosity does not directly determine the COF (coefficient of friction) of the lubricating oil, but the higher the dynamic viscosity, the higher the COF of the lubricating oil. The higher the viscosity-pressure coefficient, the lower the viscosity index (the worse the viscosity-temperature performance), and the higher the COF of the lubricating oil, which is related to the adaptability of the molecular structure of lubricating oils to pressure and temperature. PAO synthetic oils and polyol ester oils have excellent friction properties resulting from their strong adaptability to temperature and pressure variations due to the presence of linear chains and flexible groups. Full article
(This article belongs to the Special Issue Thin Films for Tribological Applications)
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