Advances in Polymer Tribology

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

Deadline for manuscript submissions: closed (30 September 2018) | Viewed by 19612

Special Issue Editors

The School of Aerospace, Mechanical & Mechatronics Engineering, The University of Sydney, Sydney, NSW 2006, Australia
Interests: tribology; polymer composites; nanoindentation; additive manufacturing

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Guest Editor
Faculty of Engineering, Department of Mechanical Engineering, Imeprial College London, London, UK

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Guest Editor
Polymer Technology Center, Department of Materials Science and Engineering, Texas A&M University, College Station, TX, USA

Special Issue Information

Dear Colleagues,

Over the past few decades, polymers have been increasingly used in various forms, such as composites, films and coatings in a wide range of applications, offering a lower weight and super energy efficient alternative to the metallic and ceramic materials. A number of these applications, such as seals, bearings and gears demand reduction in friction and wear of polymeric components for better mechanical performance and long service life. Polymer solutions have been proven successful for many tribological applications, especially under dry sliding conditions thanks to their self-lubricating behaviour. Nevertheless, ever-increasing stringent demands in new applications require overcoming new challenges by properly designing and fabricating polymer components with desired tribological performance, especially under harsh environmental conditions, such as erosion, corrosion and high temperature. In view of the importance of polymer tribology in innovation and technological development, this Special Issue aims at offering a major and critical dissemination of the state-of-the-art progresses on polymer tribology. Both theoretical and practical aspects of the polymer tribology research findings are welcome. We are looking forward to receiving your contribution.

Dr. Li Chang
Dr. Janet Wong
Prof. Dr. Hung-Jue Sue
Guest Editors

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Keywords

  • Polymer tribology
  • films
  • Coatings
  • Erosion
  • Wear
  • Extreme sliding

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Published Papers (3 papers)

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Research

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14 pages, 8619 KiB  
Article
Static and Dynamic Friction of Pure and Friction-Modified PA6 Polymers in Contact with Steel Surfaces: Influence of Surface Roughness and Environmental Conditions
by Joel Voyer, Stefan Klien, Igor Velkavrh, Florian Ausserer and Alexander Diem
Lubricants 2019, 7(2), 17; https://doi.org/10.3390/lubricants7020017 - 16 Feb 2019
Cited by 21 | Viewed by 6076
Abstract
In the present study, PA6 polymers with and without solid lubricant inclusions were investigated against S1100QL steel surfaces that had different surface roughness values—a very high surface roughness (Rz ≈ 40 µm) and a low surface roughness (Rz [...] Read more.
In the present study, PA6 polymers with and without solid lubricant inclusions were investigated against S1100QL steel surfaces that had different surface roughness values—a very high surface roughness (Rz ≈ 40 µm) and a low surface roughness (Rz ≈ 5 µm). Static and dynamic friction coefficients were analysed under a series of nominal contact pressures (2.5 to 40 N/mm2) considering the influences of polymer water saturation, temperature, counter-body surface roughness and lubrication. Mechanisms for the observed influences of the respective parameters are provided and are interpreted from the view of the adhesive and deformative contributions to the friction force. Full article
(This article belongs to the Special Issue Advances in Polymer Tribology)
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18 pages, 7486 KiB  
Article
An Experimental Study on Starved Grease Lubricated Contacts
by David E. P. Gonçalves, Armando V. Campos and Jorge H. O. Seabra
Lubricants 2018, 6(3), 82; https://doi.org/10.3390/lubricants6030082 - 10 Sep 2018
Cited by 13 | Viewed by 5071
Abstract
The film thickness of a ball-on-disc contact lubricated with four greases of different formulations was measured under different operating conditions until starvation. Two polymer-thickened greases and two lithium-thickened greases, formulated with base oils of different nature and/or viscosity, were tested. The central film [...] Read more.
The film thickness of a ball-on-disc contact lubricated with four greases of different formulations was measured under different operating conditions until starvation. Two polymer-thickened greases and two lithium-thickened greases, formulated with base oils of different nature and/or viscosity, were tested. The central film thickness was measured under constant operating conditions (load, temperature, slide-to-roll ratio) varying only the entrainment speed. In a separate test, the film thickness was measured over time with all operating conditions set to constant. Pictures of the film thickness profile across the contact area were also registered. The results were compared with the fully flooded results. The coefficient of friction (COF) was measured in a ball-on-disc contact under equal operating conditions and the results were correlated with the film thickness findings. The different grease formulations and the influence of the operating conditions on the film thickness and COF were discussed. The polymer thickened the greases, promoting lower COF and higher film thickness, especially when there is thickener material crossing the contact which happens quite often for these greases. Full article
(This article belongs to the Special Issue Advances in Polymer Tribology)
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Review

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31 pages, 7504 KiB  
Review
Recent Advances in High Performance Polymers—Tribological Aspects
by Abdulaziz Kurdi and Li Chang
Lubricants 2019, 7(1), 2; https://doi.org/10.3390/lubricants7010002 - 31 Dec 2018
Cited by 47 | Viewed by 7765
Abstract
High-performance polymer (HPP)-based engineering materials in tribological applications have been under continuous research over the last few decades. This paper reviewed the recent studies on the sliding wear properties of HPPs and their nanocomposites, which are associated with the intrinsic and extrinsic parameters. [...] Read more.
High-performance polymer (HPP)-based engineering materials in tribological applications have been under continuous research over the last few decades. This paper reviewed the recent studies on the sliding wear properties of HPPs and their nanocomposites, which are associated with the intrinsic and extrinsic parameters. In particular, the effects of the intrinsic properties of polymer composites (e.g., mechanical properties of the materials and the types of fillers) and external environmental conditions (e.g., service temperature and lubrication medium) on the formation of transfer layers (TLs) were discussed. The latter would govern the overall friction and wear of polymeric materials in sliding against metallic counterparts. In addition, correlations between the basic mechanical properties of HPPs and their sliding wear behavior were also explored. Full article
(This article belongs to the Special Issue Advances in Polymer Tribology)
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