Tribology and Mechanical Characteristics of Films

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

Deadline for manuscript submissions: closed (10 September 2023) | Viewed by 4047

Special Issue Editors


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Guest Editor
Institute of Condensed Matter Chemistry and Technologies for Energy - National Research Council (CNR-ICMATE), 35127 Padova, Italy
Interests: characterization of coatings; PVD coatings; friction and wear; nanofluids and nanolubricants; tribolgy; tribocorrosion; lubrication; mechanical properties of coatings; nanoindentation; surface science; structural properties; surface topology analysis; nanoparticles; sonoelectrochemistry
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Guest Editor
Institute of Condensed Matter Chemistry and Technologies for Energy - National Research Council (CNR-ICMATE), 35127 Padova, Italy
Interests: PVD magnetron sputtering; HiPIMS; PVD coatings; sol-gel coatings, characterization of coatings; friction and wear; tribolgy; tribocorrosion; mechanical properties of coatings; nanoindentation; contact angle; surface science; surface topology analysis

Special Issue Information

Dear Colleagues,

The demand for coating solutions with high wear resistance, superior mechanical properties, corrosion resistance and enhanced friction behavior is increasing, thanks to recent and growing advances in modern manufacturing technologies for thin-film deposition on increasingly diversified substrates. Since industry constantly seeks coatings with improved properties, the research on structures, materials and deposition technologies able to withstand the increasingly severe working conditions encountered in actual applications—from the automotive/transport sector to biomedical and mechanical/tool industries— is very active.

In many situations, product manufacturers want to modify the surface properties of a component without changing its internal characteristics and, in most cases, the intended surface properties are associated with friction, wear and hardness. Coatings protect structural materials with poor surface properties and wear resistance, limiting the costs of using high-performance materials as the good surface properties can be obtained even with reduced thicknesses. Thus, tribological coatings confer functional properties, such as lubricity, hardness, or wear and corrosion resistance, to less-valued substrates and improve the quality of the components. Consequently, the substrate can be designed for strength and toughness.

The topics of interest for this this Special Issue include (but are not restricted to):

  • Low -riction coatings;
  • Wear-resistant coatings;
  • Tribological coatings for extreme conditions, e.g., high/low temperature, harsh environments, etc.;
  • Tribological coatings for biomedical applications;
  • Hard protective coatings;
  • Tribocorrosion in various environments (sea water, acid/alkaline media, and simulated body fluids);
  • Any other aspects of tribological coatings.

Dr. Valentina Zin
Dr. Enrico Miorin
Guest Editors

Manuscript Submission Information

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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

  • thin films
  • wear
  • friction
  • mechanical properties
  • tribocorrosion

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Published Papers (3 papers)

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Research

17 pages, 12728 KiB  
Article
Effect of an Ultrasonic Vibration on the Microstructure and Properties of Al Alloy/Steel Laser Welding-Brazing Joints
by Chao Zhang, Daozhong Du, Ziqian Wu, Yubo Sun, Xiaoyang Wang, Weimin Long and Juan Pu
Coatings 2024, 14(9), 1219; https://doi.org/10.3390/coatings14091219 - 21 Sep 2024
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Abstract
This study analyzes the influence of different ultrasonic amplitudes on the microstructure composition, microhardness, tensile strength, and corrosion resistance of Al alloy/steel laser welding-brazing joints assisted by ultrasonic vibration. The application of ultrasonic vibration did not change the microstructure composition of the joints [...] Read more.
This study analyzes the influence of different ultrasonic amplitudes on the microstructure composition, microhardness, tensile strength, and corrosion resistance of Al alloy/steel laser welding-brazing joints assisted by ultrasonic vibration. The application of ultrasonic vibration did not change the microstructure composition of the joints but refined them. The joints were all composed of θ-Fe(Al, Si)3 and τ5-Al7.2Fe1.8Si formed at the interface reaction zone, as well as an α-Al solid solution and Al-Si eutectic phase generated in the weld seam zone. Meanwhile, the thickness of the IMCs at the interface decreased with an increase in the ultrasonic amplitude. When the ultrasonic amplitude was 8 μm, the IMCs thickness was a minimum of 1.62 μm. In this condition, the reduction of the IMCs thickness and the refined grain of joints made the microhardness and tensile strength reach the maximum. The fracture of joints with ultrasonic amplitudes of 0 and 4.8 μm began at the weld seam and extended to the interface reaction zone at the steel side, while the fracture of joints was located in the heat-affected zone (HAZ) of the Al alloy side when the ultrasonic amplitude was 8.0 and 11.2 μm. The fracture mode of the former presented a typical mixed fracture with cleavage steps and tearing edges, and that of the latter showed ductile fracture with uniform and fine ductile dimples. The corrosion resistance of the joints was improved by adding ultrasonic vibration. When the ultrasonic amplitude was 8 μm, its corrosion resistance was optimum; it was ascribed to a dense oxide film formed on the surface of the metal under the action of ultrasonic vibration. Full article
(This article belongs to the Special Issue Tribology and Mechanical Characteristics of Films)
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10 pages, 6636 KiB  
Article
The Effects of Ti/Ni Doping on the Friction and Wear Properties of DLC Coatings
by Shuling Zhang, Shuaizheng Wu, Tenglong Huang, Xiangdong Yang, Feng Guo, Bo Zhang and Wenjie Ding
Coatings 2023, 13(10), 1743; https://doi.org/10.3390/coatings13101743 - 8 Oct 2023
Cited by 2 | Viewed by 1352
Abstract
Diamond-like carbon (DLC) coatings doped with Ti and Ni elements were deposited on 316 L stainless steel substrate using magnetron sputtering technology. The morphology, microstructures, and performances of the coatings were detected using scanning electron microscopy, a Raman spectrometer, nanoindenter, scratch tester, and [...] Read more.
Diamond-like carbon (DLC) coatings doped with Ti and Ni elements were deposited on 316 L stainless steel substrate using magnetron sputtering technology. The morphology, microstructures, and performances of the coatings were detected using scanning electron microscopy, a Raman spectrometer, nanoindenter, scratch tester, and a tribological machine. The effects of element doping on the microstructures, friction and wear properties of DLC coatings were analyzed. The results revealed that Ti/Ni doping ensures the uniform cover and tight fit of DLC coatings on the substrate. Additionally, Ni-doped DLC coatings have a much smoother surface and denser texture with higher bonding strength and enhanced hardness (7.5 GPa) though Ti doping also can improve the bond strength to some extent. The presence of Ni both in the 316 L substrate and in Ni-doped DLC coatings improves interface matching, decreases structural differences, and increases bonding strength. Moreover, the presence of Ni effectively inhibits oxidation and corrosion in friction interfaces, stabilizes the friction coefficient, and enhances wear resistance. Therefore, based on this study, it was concluded that reasonable matching between the dopant elements and the substrates can effectively improve the performance of DLC coatings. Full article
(This article belongs to the Special Issue Tribology and Mechanical Characteristics of Films)
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19 pages, 25023 KiB  
Article
Comparative Study on Wear Behaviors of Monolayer and Heterogeneous Multilayer Ta Coatings in Atmospheric and SBF Environments
by Yun Yue, Shuguang Liu, Weiwei Qiu, Fei Wang, Yongjie Xue, Chaoqun Xia and Sanming Du
Coatings 2023, 13(1), 120; https://doi.org/10.3390/coatings13010120 - 9 Jan 2023
Cited by 2 | Viewed by 1657
Abstract
Monolayer Ta and multilayer Ti/Zr/Ta and Zr/Ti/Ta coatings were prepared by magnetron sputtering on TC4 substrates to improve the surface friction and wear properties in a simulated body fluid (SBF) environment and an atmospheric environment. Optical microscopy, scanning electron microscopy, laser scanning confocal [...] Read more.
Monolayer Ta and multilayer Ti/Zr/Ta and Zr/Ti/Ta coatings were prepared by magnetron sputtering on TC4 substrates to improve the surface friction and wear properties in a simulated body fluid (SBF) environment and an atmospheric environment. Optical microscopy, scanning electron microscopy, laser scanning confocal microscopy and nano scratch testing were employed to establish the structure-property-environment relationships. By controlling the preparation parameters, the outermost layer of all three samples was Ta coating, and the total coating thickness of each sample was about 3 μm. Friction and wear testing revealed that, compared to bare TC4 substrate, and multilayer Ti/Zr/Ta and Zr/Ti/Ta coatings, the monolayer Ta possessed the lowest friction coefficient as well as the minimum wear rate (i.e., calculation result of the wear track width and wear depth). This was mainly attributed to excellent adhesion strength, a particular structure and solid lubrication of the monolayer coating. The same coating sample exhibited a stronger wear resistance in the SBF environment than in the atmospheric environment. Furthermore, the wear behaviors and mechanisms of various coatings under different experimental environments are also discussed. Full article
(This article belongs to the Special Issue Tribology and Mechanical Characteristics of Films)
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