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10th Anniversary of Coatings: Invited Papers in Tribology Section
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10th Anniversary of Coatings: Invited Papers in Tribology Section

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

Deadline for manuscript submissions: closed (30 April 2022) | Viewed by 10755

Special Issue Editor

Prof. Dr. Huirong Le

E-Mail Website
Guest Editor
The Future Lab, Tsinghua University, San-Cai-Tang Building, No. 160 Cheng-Fu Road, Haidian District, Beijing 100084, China
Interests: antimicrobial coatings; biotribology; mechanics and tribology of coatings; lightweight composites
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The year 2021 marks the 10th anniversary of the publication of Coatings. In celebration of this special occasion, we have launched a Special Issue called "10th Anniversary of Coatings: Invited Papers in Tribology Section".

In 2016, Coatings was accepted for indexing by Science Citation Index Expanded—Web of Science, and we received our first impact factor (2.175) for Coatings in 2017. The Impact Factor of Coatings increased to 2.436 for the year 2019, and it was included in Scopus and ranked 59/120 (Q2 in SJR) in ‘’Materials Science: Surfaces, Coatings and Films’’ in 2020. We have also reduced the manuscript turnaround time; presently, the median publication time is only 33 days.

Among all sections of Coatings, the Tribology section is young but are growing fast. We have established six Special Issues since its inception. On this occasion, we would like to thank our all editorial board members, managing editors, reviewers, and authors for their great contributions and continuous support. This Special Issue will collect research articles and high-quality review papers in the Tribology research fields. We kindly encourage all research groups working in Tribology areas to make contributions to this Special Issue.

Prof. Dr. Huirong Le
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 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.

Published Papers (5 papers)

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Research

17 pages, 4840 KiB  
Article
Molecular Dynamics Simulation of Chip Morphology in Nanogrinding of Monocrystalline Nickel
by Xingchun Wei, Xiaowen Wang, Dingfeng Qu, Zongxiao Zhu, Weihua Chen, Wenbang Chen, Tianzuo Shi and Bin Peng
Coatings 2022, 12(5), 647; https://doi.org/10.3390/coatings12050647 - 09 May 2022
Cited by 1 | Viewed by 1479
Abstract
In this study, the nanogrinding process for single-crystal nickel was investigated using a molecular dynamics simulation. A series of simulations were conducted with different tool radii and grinding methods to explore the effects of chip morphology, friction forces, subsurface damage, and defect evolution [...] Read more.
In this study, the nanogrinding process for single-crystal nickel was investigated using a molecular dynamics simulation. A series of simulations were conducted with different tool radii and grinding methods to explore the effects of chip morphology, friction forces, subsurface damage, and defect evolution on the nanogrinding process. The results demonstrate that the workpiece atoms at the back of the tool were affected by the forward stretching and upward elastic recovery when no chips were produced. Although the machining depth was the smallest, the normal force was the largest, and dislocation entanglement was formed. The small number of defect atoms indicates that the extent of subsurface damage was minimal. Moreover, when spherical chips were produced, a typical columnar defect was generated. The displacement vector of the chip atoms aligned with the machining direction and as the chips were removed by extrusion, the crystal structure of the chip atoms disintegrated, resulting in severe subsurface damage. By contrast, when strip chips were produced, the displacement vector of the chip atoms deviated from the substrate, dislocation blocks were formed at the initial stage of machining, and the rebound-to-depth ratio of the machined surface was the smallest. Full article
(This article belongs to the Special Issue 10th Anniversary of Coatings: Invited Papers in Tribology Section)
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15 pages, 7209 KiB  
Article
Low Friction and High Wear Resistance of Plasma Electrolytic Oxidation (PEO)-Coated AZ31 Mg Alloy Sliding against Hydrogenated DLC (a-C-H) at Elevated Temperatures
by Sukanta Bhowmick, Faiz Muhaffel, Behzad Eskandari, Huseyin Cimenoglu and Ahmet T. Alpas
Coatings 2022, 12(5), 607; https://doi.org/10.3390/coatings12050607 - 29 Apr 2022
Cited by 1 | Viewed by 1471
Abstract
Plasma electrolytic oxidation (PEO) treatment of Mg alloys improves their wear resistance by increasing their surface hardness, but also leads to high coefficient of friction (COF) values. The sliding counterfaces and the conditions under which PEO-coated Mg alloys operate affect their COFs. PEO-coated [...] Read more.
Plasma electrolytic oxidation (PEO) treatment of Mg alloys improves their wear resistance by increasing their surface hardness, but also leads to high coefficient of friction (COF) values. The sliding counterfaces and the conditions under which PEO-coated Mg alloys operate affect their COFs. PEO-coated AZ31 alloy sliding against hydrogenated DLC (a-C-H) coated steel yields a low COF of 0.13 under the ambient conditions. The current study investigates the effect of the test temperature on the tribological behavior of PEO-coated AZ31 Mg samples sliding against the a-C-H coated counterface at temperatures up to 300 °C. According to the COF vs. wear rate diagram constructed in the temperature range of 25–250 °C, lower COF values and wear rates were exhibited by PEO-coated AZ31 sliding against a-C-H compared to uncoated AZ31 sliding against a-C-H, and PEO coated AZ31 sliding against an uncoated ASTM 52100 steel. The PEO-coated AZ31 produced the lowest COF of 0.03 at 200 °C. The application of PEO to the Mg alloy automotive cylinder bores running against DLC-coated piston rings and/or PEO-coated Mg alloy pistons running against DLC-coated bores could provide a new approach for the prevention of seizure and hot scuffing in lightweight engines in the temperature range between 150–250 °C. Full article
(This article belongs to the Special Issue 10th Anniversary of Coatings: Invited Papers in Tribology Section)
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15 pages, 6558 KiB  
Article
Rheological and Tribological Properties of Lithium Grease and Polyurea Grease with Different Consistencies
by Yanshuang Wang, Pu Zhang, Jianghai Lin and Xudong Gao
Coatings 2022, 12(4), 527; https://doi.org/10.3390/coatings12040527 - 13 Apr 2022
Cited by 13 | Viewed by 2860
Abstract
The rheological properties of lithium grease and polyurea grease at different temperatures and consistencies were determined with a rotary rheometer. The plateau moduli of the greases were calculated, and the mechanism of influence of consistency and temperature on the rheological properties of the [...] Read more.
The rheological properties of lithium grease and polyurea grease at different temperatures and consistencies were determined with a rotary rheometer. The plateau moduli of the greases were calculated, and the mechanism of influence of consistency and temperature on the rheological properties of the greases was explained. The tribological and wear properties of the two greases were measured by high-temperature friction and wear tester. The friction and wear mechanisms are probed by the rheological properties of lubricating grease. The results show that the plateau modulus GN can be used to assess the structural strength of different greases, but it can only assess the degree of entanglement of the same grease. The higher the consistency of the grease, the larger the apparent viscosity, structural strength, and yield stress. The rheological properties of PAO-polyurea grease are greatly affected by temperature, but its structural strength is better than that of mineral oil-lithium grease. The consistency of mineral oil-lithium grease is expected to affect the friction coefficient and wear through its influence on the grease’s structural strength and film-forming ability. For PAO-polyurea, the consistency in a certain range has little effect on the friction coefficient and wear resistance. Full article
(This article belongs to the Special Issue 10th Anniversary of Coatings: Invited Papers in Tribology Section)
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11 pages, 3276 KiB  
Article
Effect of CeO2 Content on Microstructure and Properties of Ni-Based Tungsten Carbide Layer by Plasma Arc Cladding
by Juan Pu, Yu-Bo Sun, Lei Wu, Peng He and Wei-Min Long
Coatings 2022, 12(3), 342; https://doi.org/10.3390/coatings12030342 - 06 Mar 2022
Cited by 3 | Viewed by 1643
Abstract
A Ce-containing Ni-based tungsten carbide layer was prepared on the surface of Q345 steel by plasma arc cladding technology. The effect of CeO2 additions on the microstructure and properties of the Ni-based tungsten carbide cladding layer was investigated. The results showed that [...] Read more.
A Ce-containing Ni-based tungsten carbide layer was prepared on the surface of Q345 steel by plasma arc cladding technology. The effect of CeO2 additions on the microstructure and properties of the Ni-based tungsten carbide cladding layer was investigated. The results showed that the Ni-based tungsten carbide cladding layer had no pores and cracks and that their microstructural composition remained unchanged with CeO2 in the powder. After adding CeO2 into the powder, Ce atoms were absorbed on the surface of tungsten carbide particles to promote their dissolution and spheroidization. The preferentially formed high-melting-point Ce2O3 acted as a nucleating agent to induce the formation and dispersion of carbides. The shape of carbide particles changed from an irregular shape to a spherical shape. When the content of CeO2 was less than 0.2 wt.%, with the increase of CeO2 additions, the microstructure was refined. Meanwhile, the hardness and wear resistance of Ni-based tungsten carbide cladding layer increased. When the content of CeO2 was 0.2 wt.%, the refinement effect of CeO2 on the microstructure reached an optimum value, and the hardness value reached the maximum of 1139 HV10. Moreover the wear resistance was the best. This was attributed to the dispersion strengthening of undissolved tungsten carbide particles, the solid solution strengthening of Ni-based solid solution, and the precipitation strengthening of carbides. However, as the content of CeO2 exceeded 0.2 wt.%, excessive CeO2 increased the viscosity of the solution, resulting in component segregation. Thus, the refinement and spheroidization action of CeO2 weakened, and irregular-shaped carbides appeared again. The hardness and wear resistance of the Ni-based tungsten carbide cladding layer obviously decreased. Ce-containing Ni-based tungsten carbide layer can be widely used in deep-sea mining and other fields due to its high hardness and wear resistance. Full article
(This article belongs to the Special Issue 10th Anniversary of Coatings: Invited Papers in Tribology Section)
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18 pages, 3976 KiB  
Article
Structural and Tribological Properties of Heat-Treated Stainless Steels against Abrasive and Lubricant Wear Conditions
by Samah A. Al-Shelkamy, Hassan M. Abu Hashish and Amir A. Mahdy
Coatings 2021, 11(12), 1473; https://doi.org/10.3390/coatings11121473 - 30 Nov 2021
Cited by 5 | Viewed by 1592
Abstract
The current paper investigates the effect of the heat treatment process on three grades of stainless steel alloys against the abrasive and the lubricant wear conditions, using 25 wt.% glucose solution for the industrial agriculture applications. The heat treatment process was carried out [...] Read more.
The current paper investigates the effect of the heat treatment process on three grades of stainless steel alloys against the abrasive and the lubricant wear conditions, using 25 wt.% glucose solution for the industrial agriculture applications. The heat treatment process was carried out for one hour at 900 ± 10 °C, followed by quenching with monograde motor oil and tempering for more than two hours at 200 ± 10 °C. Several analyses were conducted to estimate the final mechanical, surface morphological and tribological properties for the studied materials, before and after the heat treatment process. The heat-treated martensitic stainless steel grade exhibited superior wear resistance and higher hydrophobicity compared to the other two heat-treated austenite stainless steel grades. Therefore, the mechanism of the heat treatment process, the chemical and physical nature of the parent material, and the viscosity of the selected lubricant all influence the final behaviour of the studied material against the applied operating conditions for the selected application. Full article
(This article belongs to the Special Issue 10th Anniversary of Coatings: Invited Papers in Tribology Section)
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