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Special Issue "Friction, Wear, Lubrication and Mechanics of Surfaces and Interfaces"

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

Deadline for manuscript submissions: 31 March 2024 | Viewed by 2464

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Dr. Jurgita Zekonyte

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School of Mechanical and Design Engineering, University of Portsmouth, Portsmouth, UK
Interests: surfaces and interfaces; mechanical and tribological characterization at micro- and nanoscale; bio-inspired structures for surface science and engineering
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

We invite you to submit your work to this Special Issue, “Friction, Wear, Lubrication and Mechanics of Surfaces and Interfaces”. From friction and wear to corrosion and fatigue to biofouling, most engineering problems stem from the surface. Surfaces and interfaces are integral parts of any product. Their malfunction might result in product failure, and in some cases, fatal outcomes. Bulk material properties are well-known and researched, yet their surface and interface properties differ and often have an undesired impact on the overall performance. Using advanced surface engineering, design, and controlled modification, it is possible to adjust specific properties (tribological, mechanical, chemical, and many others) to tailor material performance for targeted applications while leaving the bulk untouched.

This Special Issue will cover a wide range of topics in mechanical and tribological properties characterization of surfaces and interfaces from the nano- to macroscale. Topics of interest include, but are not limited to:

Functional, adaptive, smart multilayered coatings and surfaces;
Computer simulations, modelling, and design strategy;
Structure, texture, mechanics, tribology of surfaces and interfaces;
Surfaces for special applications: space, vacuum, biomedical, extreme temperatures, etc.

Full research papers, communications, and reviews addressing topics within the scope of this Special Issues are welcome.

Dr. Jurgita Zekonyte
Guest Editor

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 2200 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

nano/micro/macro tribology
functional surfaces and interfaces
advanced surface texturing, design and engineering
lubrication and solid lubricants
surface mechanics
friction and wear behaviour
surface modification

Published Papers (4 papers)

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Research

Open AccessArticle

Morphology and Composition of the Third Body on the Friction Surface of an Organic Composite Railway Brake Shoe

and

Coatings 2023, 13(5), 952; https://doi.org/10.3390/coatings13050952 - 19 May 2023

Viewed by 456

Abstract

Friction properties are significantly affected by third bodies (films formed on friction surfaces). However, the study of their composition and structure remains incomplete. For this reason, an organic composite railway brake shoe was tested at an initial braking speed of 125 km/h using a full-scale dynamometer. A third body with a thickness of ~120 μm was obtained, and its morphology and composition were analyzed using a multiple techniques. The results indicated that the third body had a layered structure. The upper surface was smoother than the lower surface. The carbon content on the upper surface decreased by 68.01%, and the iron content increased by 11.85 times in relation to that on the lower surface. Compared to the brake shoe, the iron content of the third body increased by 272.81%, and most of the iron was oxidized. Furthermore, the content of barium, calcium, and silicon decreased by more than 33%, and the crystalline structures of the inorganic filler materials, such as graphite and barium sulfate, were destroyed, with new crystalline structures appearing. Finally, the residual weight at 650 °C increased from 90.35% to 96.59%. This research could provide a reference for exploring the friction and wear mechanisms of organic composite railway brake shoes. Full article

(This article belongs to the Special Issue Friction, Wear, Lubrication and Mechanics of Surfaces and Interfaces)

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Open AccessArticle

Multiscale Wear Simulation in Textured, Lubricated Contacts

Michael Maier

Michael Pusterhofer

and

Florian Grün

Coatings 2023, 13(4), 697; https://doi.org/10.3390/coatings13040697 - 29 Mar 2023

Viewed by 537

Abstract

Specific surface textures may reduce the friction and increase the lifting forces in lubricated contacts. For the detrimental operating condition of mixed friction, wear is induced by the solid contact. In this study, a methodology for wear calculation in textured, lubricated contacts is presented that considers the wear-induced surface topography evolution. Based on the Reynolds differential equation, the mass-conserving cavitation model according to Jakobsson, Floberg, and Olsson (JFO), a wear-dependent asperity contact pressure curve and the wear equation according to Archard, wear in a wedge-shaped, textured lubrication gap was calculated. The results show the wear behavior of textured lubrication gaps. Based on the wear simulations, the tribological behavior of the textured surfaces compared to smooth surfaces is discussed. It is evident that textures, which improve the tribological performance in the hydrodynamic lubrication regime, are not necessarily associated with low wear values in a lubrication condition in the mixed friction regime. The analysis of the wear-dependent parameters initially showed a ‘recovery’ of the tribological system with increasing wear until the performance decreased again after a specific reversal point. This behavior is attributed to the relative position of the surface textures in the lubrication gap. Full article

(This article belongs to the Special Issue Friction, Wear, Lubrication and Mechanics of Surfaces and Interfaces)

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Open AccessArticle

Effect of MoO₃ Content on Ni₃Al-Ag-MoO₃ Composite Coating Microstructure and Tribological Properties

and

Coatings 2023, 13(3), 624; https://doi.org/10.3390/coatings13030624 - 15 Mar 2023

Viewed by 405

Abstract

In order to provide effective solid lubrication to Ni₃Al coating, 10 wt.% Ag and different amounts of MoO₃ solid lubricant were mechanically mixed with the SHSed Ni₃Al powder and sprayed HVOF. Microstructure, mechanical properties, and tribological behavior from 25 °C to 800 °C of the coatings were studied, and the basic wear mechanisms were explored and discussed as well. Results show that the hardness and adhesive bonding strength of the coatings are slightly decreased, while there is little effect on the microstructure and mechanical properties of the Ni₃Al-based composite coating when the content of MoO₃ additive in the feedstock powder is lower than 15 wt.%. The composite coating formed by feedstock powder containing 15 wt.% MoO₃ additive also presents excellent anti-friction and anti-wear performance from 25 °C to 800 °C, especially at 800 °C, where a complete, smooth, and thicker lubricating film comprised of NiO, Al₂O₃, MoO₃, and Ag₂MoO₄ was formed, which reduced the friction coefficient (COF) and wear rate (WR) to the lowest value of 0.36 and 6.03 × 10⁻⁵ mm³/(Nm), respectively. An excessive amount of MoO₃ in the feedstock powder (20 wt.%) results in inferior interlayer bonding of the formed coating, and the coating is more prone to delamination and abrasive wear above 200 °C. Full article

(This article belongs to the Special Issue Friction, Wear, Lubrication and Mechanics of Surfaces and Interfaces)

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Open AccessArticle

Surface Characteristic and Friction Behavior of Plasma Sprayed FeCoNiCrMo_0.2 High Entropy Alloy Coatings on BS960 High-Strength Steel with Subsequent Shot Peening Treatment

Zheng Yang

and

Chuanhai Jiang

Coatings 2023, 13(2), 303; https://doi.org/10.3390/coatings13020303 - 29 Jan 2023

Viewed by 782

Abstract

The FeCoNiCrMo_0.2 high entropy alloy coatings were deposited on BS960 high strength steel by plasma spraying method with four different current intensities (250 A, 350 A, 450 A, 550 A). These coatings were then subjected to a subsequent micro-shot peening treatment. Surface characteristics including surface morphology, microhardness and phase composition were characterized, and the wear resistance of the coatings was assessed by reciprocal friction and wear tests. The results showed that the high entropy alloy coatings had FCC structure. XRD results showed that no new phase was formed during the spraying process. At the same time, shot peening treatment could effectively improve the hardness of the coating surface. Under the four processes, the coating surface prepared with the current intensity of 350 A had the highest microhardness and uniformity before and after shot peening, and the hardness values were 473 ± 10.21 and 504 ± 8.62 HV_0.2, respectively. The friction and wear test results showed that the friction coefficients of the four coatings were close to each other at 10 N load, which was about 0.4. When the test load reached 25 N, the friction coefficient of the coating with current intensity of 350 A was lower, and it showed better friction performance. After shot peening, the friction coefficient of the four coatings further decreased to about 0.3 under 10 N loading due to the existence of hardened surface layer. When the test load reached 25 N, the hardened layer would be worn through and the friction coefficient would suddenly rise. Under the 25 N test load, the hardened layer of the high-entropy alloy coating with current intensity of 350 A illustrated better friction resistance. Full article

(This article belongs to the Special Issue Friction, Wear, Lubrication and Mechanics of Surfaces and Interfaces)

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