Special Issue "Tribological Behavior of Functional Surface: Models and Methods"

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

Deadline for manuscript submissions: 31 December 2020.

Special Issue Editors

Prof. Dr. Paweł Pawlus
Website
Guest Editor
Rzeszow University of Technology, Rzeszow, Poland
Interests: Tribology, Friction, Wear, Lubrication, Contact mechanics, Surface engineering
Special Issues and Collections in MDPI journals
Dr. Andrzej Dzierwa
Website
Guest Editor
Rzeszow University of Technology, Powstancow Warszawy 8 Street, 35-959 Rzeszow, Poland
Interests: tribology; friction; wear; surface engineering; surface metrology; manufacturing processes
Special Issues and Collections in MDPI journals

Special Issue Information

Dear Colleagues,

It is our pleasure to invite you to submit a manuscript to the forthcoming Special Issue “Tribological Behavior of Functional Surfaces: Models and Experiments” in Coatings (Open Access Materials Science Journal; Impact Factor 2.33).

Surfaces of solid bodies contain characteristic features, affecting the functional properties of machine elements. Surface topography restricting the contact area to a very small ratio of the nominal area is one of the fundamental features of significant importance for contact mechanics, friction wear, and lubrication. Surface engineering improves tribological performance. Surface texturing is a method used in surface engineering to improve the sliding properties of assemblies by creating dimples on surfaces. Tribological processes can lead to increased chemical reactivity. Understanding of surface processes at the nanoscale is very important.

The aim of this Special Issue is to collect high-quality research papers, short communications, and review articles that focus on the tribological behavior of functional surfaces. Contributions involving modeling and/or experimental approaches are particularly welcome.

Should you need any further information about this Special Issue, please do not hesitate to contact us.

Prof. Dr. Pawel Pawlus
Dr. Andrzej Dzierwa
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 papers will be 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 1600 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

  • Tribology
  • Contact mechanics
  • Surface engineering
  • Surface texturing
  • Surface chemistry
  • Nanoscale tribology

Published Papers (8 papers)

Order results
Result details
Select all
Export citation of selected articles as:

Research

Open AccessFeature PaperArticle
Friction Reduction in Unidirectional Lubricated Sliding Due to Disc Surface Texturing
Coatings 2020, 10(3), 221; https://doi.org/10.3390/coatings10030221 - 29 Feb 2020
Cited by 1
Abstract
Surface texturing is an option of surface engineering resulting in reduction of friction due to the creation of isolated dimples or grooves on sliding surfaces. The purpose of this work is to find the effect of the groove bottom profiles on the reduction [...] Read more.
Surface texturing is an option of surface engineering resulting in reduction of friction due to the creation of isolated dimples or grooves on sliding surfaces. The purpose of this work is to find the effect of the groove bottom profiles on the reduction of the friction force. Investigations were conducted using an Optimol SRV5 tribotester equipped with a pin-on-disc module. A disc made of 42CrMo4 steel, with a 100 mm diameter acted as a sample. A counter-sample was made of the same material, however, its diameter was 20 mm. The sliding conditions were selected to be similar to those of a sliding crankpin bearing pad operating in a high-performance internal combustion engine. Surface texturing was found to be beneficial for a reduction in the friction coefficient up to 55% in comparison to the untextured disc. Tribological performances of discs with spiral groove patterns were better than those with a radial layout. In most cases the convergent profile of the groove bottom was superior to the dam shape. Full article
(This article belongs to the Special Issue Tribological Behavior of Functional Surface: Models and Methods)
Show Figures

Figure 1

Open AccessArticle
Lubricating Properties of Cyano-Based Ionic Liquids against Tetrahedral Amorphous Carbon Film
Coatings 2020, 10(2), 153; https://doi.org/10.3390/coatings10020153 - 08 Feb 2020
Abstract
Ionic liquids have unique characteristics, which render them ideal candidates as new base oils or additives. In particular, there are great expectations from the combination of diamond-like carbon and cyano-based ionic liquids. Lubricating properties of cyano-based ionic liquids have been studied on specific [...] Read more.
Ionic liquids have unique characteristics, which render them ideal candidates as new base oils or additives. In particular, there are great expectations from the combination of diamond-like carbon and cyano-based ionic liquids. Lubricating properties of cyano-based ionic liquids have been studied on specific tetrahedral amorphous carbon (ta-C) films. After lubrication, ta-C film/ta-C film contact interface exhibits exceedingly low friction. Therefore, it is necessary to understand this low friction phenomenon. The current study evaluated the lubricating mechanism of cyano-based ionic liquids against ta-C films. 1-Butyl-3-methylimidazolium dicyanamide ((BMIM)(DCN)) and 1-butyl-3-methylimidazolium tricyanomethane ((BMIM)(TCC)) were used as lubricants, with the latter exhibiting low friction coefficient of 0.03. Steel cylinders and disks with ta-C films were used as test specimens. Raman spectroscopy, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry, and thermogravimetric analysis (TGA) helped us understand the mechanism of low friction induced by (BMIM)(TCC). Graphitization of the ta-C film at high temperatures might have caused the reduction in friction between the films. Similarly, anion adsorption on the worn surface at high temperatures also led to reduced friction. However, the TGA result showed a different trend than that of the sliding test. Our results indicate that the cyano-based ionic liquids underwent tribo-decomposition at low temperatures. Further, a minimum temperature was required for the adsorption of anions onto the sliding surface. Full article
(This article belongs to the Special Issue Tribological Behavior of Functional Surface: Models and Methods)
Show Figures

Figure 1

Open AccessArticle
The Influence of Disc Surface Topography after Vapor Blasting on Wear of Sliding Pairs under Dry Sliding Conditions
Coatings 2020, 10(2), 102; https://doi.org/10.3390/coatings10020102 - 23 Jan 2020
Cited by 3
Abstract
Wear tests were performed using a ball-on-disc tribological tester. In this study, 42CrMo4 steel disc of hardness 40 HRC co-acted with 100Cr6 steel ball with hardness of 60 HRC. Disc surfaces were created using vapor blasting to obtain values of the Sq parameter [...] Read more.
Wear tests were performed using a ball-on-disc tribological tester. In this study, 42CrMo4 steel disc of hardness 40 HRC co-acted with 100Cr6 steel ball with hardness of 60 HRC. Disc surfaces were created using vapor blasting to obtain values of the Sq parameter close to 5 µm. However, other disc surface topography parameters varied. Dry friction tests were carried out. Wear levels of discs and balls were measured using a white light interferometer Talysurf CCI Lite. It was found that the surface topography had a significant impact on tribological properties under dry sliding conditions. The research also allowed to identify significant dependencies between surface topography parameters and wear. Full article
(This article belongs to the Special Issue Tribological Behavior of Functional Surface: Models and Methods)
Show Figures

Figure 1

Open AccessArticle
Sensitivity Analysis of Rotor/Stator Interactions Accounting for Wear and Thermal Effects within Low- and High-Pressure Compressor Stages
Coatings 2020, 10(1), 74; https://doi.org/10.3390/coatings10010074 - 15 Jan 2020
Abstract
In the current design of turbomachines, engine performance is improved by reducing the clearances between the rotating components and the stator, which allows for loss decrease. Due to these clearance reductions, contact events may occur between the rotor and the stator. An abradable [...] Read more.
In the current design of turbomachines, engine performance is improved by reducing the clearances between the rotating components and the stator, which allows for loss decrease. Due to these clearance reductions, contact events may occur between the rotor and the stator. An abradable coating is deposited along the stator circumference as a sacrificial material to lower the contact severity. However, experiments highlighted the occurrence of rotor/stator interactions with high wear depth on the abradable coating as well as high temperature increases within the abradable coating following contacts. This work focuses on the sensitivity analysis of rotor/stator interactions with respect to the rotor angular speed and the initial clearances between the rotor and the stator, taking into account thermal effects within the abradable coating. Convergence analyses are first conducted to validate the numerical model. Then, after a calibration of the thermal model of the abradable coating based on two experimental test cases, the numerical model is used to investigate the cross effects of the angular speed and the initial clearances on the obtained rotor/stator interactions. Full article
(This article belongs to the Special Issue Tribological Behavior of Functional Surface: Models and Methods)
Show Figures

Figure 1

Open AccessArticle
Corrosion and Wear Resistance of Fe-Based Amorphous Coatings
Coatings 2020, 10(1), 73; https://doi.org/10.3390/coatings10010073 - 14 Jan 2020
Cited by 1
Abstract
Fe-based amorphous coatings were prepared on the surface of 45 steel substrates via supersonic plasma spraying and laser cladding. The corrosion and wear behavior of the two different coatings were investigated. Compared with supersonic plasma spraying, laser cladding resulted in coatings with a [...] Read more.
Fe-based amorphous coatings were prepared on the surface of 45 steel substrates via supersonic plasma spraying and laser cladding. The corrosion and wear behavior of the two different coatings were investigated. Compared with supersonic plasma spraying, laser cladding resulted in coatings with a relatively denser structure, lower porosity, less cracks, and a good metallurgical bond with the substrate. Thanks to these properties, coatings produced by laser cladding exhibit a higher ability to resist uniform corrosion and better friction and wear performance than plasma-sprayed coatings. Full article
(This article belongs to the Special Issue Tribological Behavior of Functional Surface: Models and Methods)
Show Figures

Figure 1

Open AccessFeature PaperArticle
Mechanical Integrity of 3D Rough Surfaces during Contact
Coatings 2020, 10(1), 15; https://doi.org/10.3390/coatings10010015 - 25 Dec 2019
Abstract
Rough surfaces are in contact locally by the peaks of roughness. At this local scale, the pressure of contact can be sharply superior to the macroscopic pressure. If the roughness is assumed to be a random morphology, a well-established observation in many practical [...] Read more.
Rough surfaces are in contact locally by the peaks of roughness. At this local scale, the pressure of contact can be sharply superior to the macroscopic pressure. If the roughness is assumed to be a random morphology, a well-established observation in many practical cases, mechanical indicators built from the contact zone are then also random variables. Consequently, the probability density function (PDF) of any mechanical random variable obviously depends upon the morphological structure of the surface. The contact pressure PDF, or the probability of damage of this surface can be determined for example when plastic deformation occurs. In this study, the contact pressure PDF is modeled using a particular probability density function, the generalized Lambda distributions (GLD). The GLD are generic and polymorphic. They approach a large number of known distributions (Weibull, Normal, and Lognormal). The later were successfully used to model damage in materials. A semi-analytical model of elastic contact which takes into account the morphology of real surfaces is used to compute the contact pressure. In a first step, surfaces are simulated by Weierstrass functions which have been previously used to model a wide range of surfaces met in tribology. The Lambda distributions adequacy is qualified to model contact pressure. Using these functions, a statistical analysis allows us to extract the probability density of the maximal pressure. It turns out that this density can be described by a GLD. It is then possible to determine the probability that the contact pressure generates plastic deformation. Full article
(This article belongs to the Special Issue Tribological Behavior of Functional Surface: Models and Methods)
Show Figures

Graphical abstract

Open AccessFeature PaperArticle
On Friction Reduction by Surface Modifications in the TEHL Cam/Tappet-Contact-Experimental and Numerical Studies
Coatings 2019, 9(12), 843; https://doi.org/10.3390/coatings9120843 - 09 Dec 2019
Cited by 1
Abstract
The overall energy efficiency of machine elements and engine components could be improved by using new technologies such as surface modifications. In the literature, surface engineering approaches like micro-texturing and the application of diamond-like carbon (DLC) coatings were frequently studied separately, with focus [...] Read more.
The overall energy efficiency of machine elements and engine components could be improved by using new technologies such as surface modifications. In the literature, surface engineering approaches like micro-texturing and the application of diamond-like carbon (DLC) coatings were frequently studied separately, with focus on a specific model contact and lubrication conditions. The contribution of the current study is to elucidate and compare the underlying friction reduction mechanisms of the aforementioned surface modifications in an application-orientated manner. The study applied the operating conditions of the thermo-elastohydrodynamically lubricated (TEHL) cam/tappet-contact of the valve train. Therefore, tribological cam/bucket tappet component Stribeck tests were used to determine the friction behavior of ultrashort pulse laser fabricated microtextures and PVD/PECVD deposited silicon-doped amorphous carbon coatings. Moreover, advanced surface characterization methods, as well as numerical TEHL tribo-simulations, were utilized to explore the mechanisms responsible for the observed tribological effects. The results showed that the DLC-coating could reduce the solid and fluid friction force in a wide range of lubrication regimes. Conversely, micro-texturing may reduce solid friction while increasing the fraction of fluid friction. Full article
(This article belongs to the Special Issue Tribological Behavior of Functional Surface: Models and Methods)
Show Figures

Graphical abstract

Open AccessFeature PaperArticle
Plasma Electrolytic Oxidation (PEO) Layers from Silicate/Phosphate Baths on Ti-6Al-4V for Biomedical Components: Influence of Deposition Conditions and Surface Finishing on Dry Sliding Behaviour
Coatings 2019, 9(10), 614; https://doi.org/10.3390/coatings9100614 - 26 Sep 2019
Cited by 1
Abstract
Plasma Electrolytic Oxidation (PEO) layers were produced on Ti-6Al-4V in different conditions, so as to assess the influence of layer structure, current mode, duty cycle and surface finishing on microstructural features and tribological behaviour. In DC regime, the double-layer structure (silicate bath followed [...] Read more.
Plasma Electrolytic Oxidation (PEO) layers were produced on Ti-6Al-4V in different conditions, so as to assess the influence of layer structure, current mode, duty cycle and surface finishing on microstructural features and tribological behaviour. In DC regime, the double-layer structure (silicate bath followed by phosphate bath) beneficially affected wear resistance. In unipolar pulsed DC (phosphate bath), the wear resistance of single layers improved with increasing duty cycle, due to improved microstructure and adhesion: high duty cycle single layers can be considered an alternative to double-layer deposition. Surface finishing by abrasive blasting with spheroidal glass beads leads to surface roughness decrease and hence to decreased friction and improved wear resistance. The best-performing PEO layers showed promising results in the comparison with reference materials such as CoCrMo (both uncoated and (Ti,Nb)N PVD-coated) and PVD-coated Ti-6Al-4V up to 30 N normal load. Full article
(This article belongs to the Special Issue Tribological Behavior of Functional Surface: Models and Methods)
Show Figures

Figure 1

Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Modelling mechanical integrity of 3D Rough surfaces during contact

  1. Bigerelle1, F. Plouraboue2, A. Jourani3, A. Fabre4

1) Université de Valenciennes, LAMIH, UMR CNRS 8201, Valenciennes, France.

2) Institut de Mécanique des Fluides, UMR CNRS 5502, 31400 Toulouse, France

3) Université de Technologie de Compiègne, Laboratoire Roberval, UMR 7337, Compiègne, France.

4) Arts et Métiers ParisTech, Laboratoire MSMP, 13617 Aix-en-Provence, France.

Back to TopTop