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Coatings
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Tribological Coatings: Nanomaterials for Macroscale
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Tribological Coatings: Nanomaterials for Macroscale

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

Deadline for manuscript submissions: closed (20 March 2022) | Viewed by 16674

Special Issue Editors

Prof. Dr. Oleksiy V. Penkov

E-Mail Website
Guest Editor
Center for Nano-Wear, Yonsei University, Seoul 03722, Korea
Interests: materials science; coatings; functional nanomaterials; tribology
Special Issues, Collections and Topics in MDPI journals
Dr. Wen Sun

E-Mail Website
Guest Editor
Institute of New Materials, Guangdong Academy of Sciences, Guangzhou, China
Interests: cold spray; thermal spray; additive manufacturing; metal coatings; metal matrix composite coatings; anti-corrosion coatings; tribological properties
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

We would like to invite you to submit your work to this Special Issue on “Tribological Coatings: Nanomaterials for Macroscale”. Being deposited on various engineering materials, functional tribological coatings allow resolving contradictions between bulk and surface properties of engineering components. Precise control of wear and frictional properties is crucial for applied engineering applications. In recent decades, significant progress has been achieved in the development of new advanced coatings materials combining outstanding mechanical, optical, and biomedical properties. The aim of this Special Issue is to highlight the latest developments in the design, synthesis, and evaluation of tribological coatings through a combination of original research papers and review articles from leading groups around the world.

In particular, the topics of interest include but are not limited to:

  • Computer simulations and design strategy;
  • Nanocomposite and multilayer tribological coatings;
  • 2D coating materials for tribological applications;
  • Structure, mechanical, and tribological properties of coatings;
  • Tribological coatings for special applications (space, vacuum, bio, etc.).

Prof. Dr. Oleksiy V. Penkov
Dr. Wen Sun
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

  • Nanostructured coatings
  • Microstructure characterization
  • Friction behaviour
  • Wear resistance
  • Wear mechanism
  • Mechanical properties

Published Papers (4 papers)

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Research

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14 pages, 6252 KiB  
Article
Cold Spray of Nickel-Based Alloy Coating on Cast Iron for Restoration and Surface Enhancement
by Adrian Wei-Yee Tan, Nataniel Yong Syn Tham, Yao Shian Chua, Kaiqiang Wu, Wen Sun, Erjia Liu, Sung Chyn Tan and Wei Zhou
Coatings 2022, 12(6), 765; https://doi.org/10.3390/coatings12060765 - 2 Jun 2022
Cited by 9 | Viewed by 2936
Abstract
Cold spray is an emerging additive manufacturing process that allows particles to be coated onto the surface of a base material without melting. It is suitable to repair components made from temperature-sensitive materials, such as grey cast iron, which cannot be easily restored [...] Read more.
Cold spray is an emerging additive manufacturing process that allows particles to be coated onto the surface of a base material without melting. It is suitable to repair components made from temperature-sensitive materials, such as grey cast iron, which cannot be easily restored using conventional methods like welding or thermal spray. In this study, the nickel-based alloy Inconel 625 was successfully coated onto a grey cast iron (GJL250) using a cold spray process, and extensive experiments were carried out to study the effects of diffusion between the coating and the substrate after heat treatment at 400, 600, 850 and 1050 °C for 3 and 6 hours durations. The coatings in all conditions were dense (0.25% to 3%) and had defect-free interfaces. Under heat treatment, the diffusion layer increased in thickness with increasing temperature and duration due to atomic diffusion. The Inconel 625 coating is also shown to be effective against oxide growth as compared to grey cast iron. The hardness of the coatings is also stable at high temperatures. The heat-treated coatings at 600 °C achieved a peak hardness of around 500 HV, which is 30% and 60% higher than the as-sprayed coating and grey cast iron substrate, respectively, because of the possible formation of recrystallized nanostructured grains and strengthening precipitates. These findings demonstrate the potential application of using cold spray on nickel-based alloy coatings for restoration and surface enhancement of grey cast iron components, such as engine blocks and pump housings. Full article
(This article belongs to the Special Issue Tribological Coatings: Nanomaterials for Macroscale)
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11 pages, 13155 KiB  
Article
Solution and Double Aging Treatments of Cold Sprayed Inconel 718 Coatings
by Wen Sun, Xin Chu, Jibo Huang, Haiming Lan, Adrian Wei-Yee Tan, Renzhong Huang and Erjia Liu
Coatings 2022, 12(3), 347; https://doi.org/10.3390/coatings12030347 - 7 Mar 2022
Cited by 4 | Viewed by 1884
Abstract
In this study, Inconel 718 coatings were deposited by the high-pressure cold spray technique, and post-process solution and double aging treatments were conducted. The microstructures of the as-deposited and heat-treated IN718 were analyzed, and their mechanical properties were tested. It was found that [...] Read more.
In this study, Inconel 718 coatings were deposited by the high-pressure cold spray technique, and post-process solution and double aging treatments were conducted. The microstructures of the as-deposited and heat-treated IN718 were analyzed, and their mechanical properties were tested. It was found that the micro-dendritic structures in the original powder were severely elongated in the as-deposited IN718 coating due to plastic deformation during the cold spray process. After solution heat treatment, Nb, Mo, and Ti-rich segregations could be dissolved, transforming to MC carbide and a needle-like δ phase. It was found that the needle-like δ phase at the grain boundary had a pinning effect to slow down the grain growth. In addition, strengthening phases could be formed by aging treatments. The mechanical properties of the cold sprayed Inconel 718 could be improved by proper solution and aging heat treatments. Full article
(This article belongs to the Special Issue Tribological Coatings: Nanomaterials for Macroscale)
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14 pages, 7996 KiB  
Article
Micro and Macro-Tribology Behavior of a Hierarchical Architecture of a Multilayer TaN/Ta Hard Coating
by César D. Rivera-Tello, E. Broitman, Francisco Javier Flores-Ruiz, J. Perez-Alvarez, M. Flores-Jiménez, O. Jiménez and M. Flores
Coatings 2020, 10(3), 263; https://doi.org/10.3390/coatings10030263 - 11 Mar 2020
Cited by 13 | Viewed by 2923
Abstract
The micro- and macro-tribological behaviors of a novel hierarchical TaN/Ta coating deposited on Ti6Al4V biomedical alloy by direct current magnetron sputtering were analyzed in the present work. This analysis was associated with the morphological, structural, and mechanical properties, as well as the roughness [...] Read more.
The micro- and macro-tribological behaviors of a novel hierarchical TaN/Ta coating deposited on Ti6Al4V biomedical alloy by direct current magnetron sputtering were analyzed in the present work. This analysis was associated with the morphological, structural, and mechanical properties, as well as the roughness changes during and after the tribological tests. The wear track of the coating after the macro-tribology tests was evaluated by Raman spectroscopy in order to detect the compounds formed as a result of the tribo-reactions that occurred during the tests. Micro- and macro-tribology behaviors showed a significant wear rate reduction of the hierarchical coating in comparison to the Ti6Al4V substrate. For the case of the micro-tribology tests, this reduction was attributed to the high hardness of the coating (31.4 GPa); however, this hardness caused a considerable increment in the friction coefficient. On the other hand, the macro-tribology performance was associated with the hardness and the ability of the hierarchical architecture to prevent the propagation of cracks. Moreover, the friction coefficient increased considerably at the end of the test; this increment was associated with the tantalum oxides in the wear track detected by Raman spectroscopy. Full article
(This article belongs to the Special Issue Tribological Coatings: Nanomaterials for Macroscale)
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Review

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27 pages, 9458 KiB  
Review
Tribology of 2D Nanomaterials: A Review
by Paul C. Uzoma, Huan Hu, Mahdi Khadem and Oleksiy V. Penkov
Coatings 2020, 10(9), 897; https://doi.org/10.3390/coatings10090897 - 18 Sep 2020
Cited by 67 | Viewed by 8118
Abstract
The exfoliation of graphene has opened a new frontier in material science with a focus on 2D materials. The unique thermal, physical and chemical properties of these materials have made them one of the choicest candidates in novel mechanical and nano-electronic devices. Notably, [...] Read more.
The exfoliation of graphene has opened a new frontier in material science with a focus on 2D materials. The unique thermal, physical and chemical properties of these materials have made them one of the choicest candidates in novel mechanical and nano-electronic devices. Notably, 2D materials such as graphene, MoS2, WS2, h-BN and black phosphorus have shown outstanding lowest frictional coefficients and wear rates, making them attractive materials for high-performance nano-lubricants and lubricating applications. The objective of this work is to provide a comprehensive overview of the most recent developments in the tribological potentials of 2D materials. At first, the essential physical, wear and frictional characteristics of the 2D materials including their production techniques are discussed. Subsequently, the experimental explorations and theoretical simulations of the most common 2D materials are reviewed in regards to their tribological applications such as their use as solid lubricants and surface lubricant nano-additives. The effects of micro/nano textures on friction behavior are also reviewed. Finally, the current challenges in tribological applications of 2D materials and their prospects are discussed. Full article
(This article belongs to the Special Issue Tribological Coatings: Nanomaterials for Macroscale)
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