Advances in Thin Film Tribology

A special issue of Lubricants (ISSN 2075-4442).

Deadline for manuscript submissions: 31 January 2027 | Viewed by 629

Special Issue Editors


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Guest Editor
Institute of Microelectronics and Optoelectronics, Faculty of Electronics and Information Technology, Warsaw University of Technology, Warsaw, Poland
Interests: advanced materials; thin films and coatings; tribology and corrosion; surfaces and interfaces
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Guest Editor
Department of Surface Engineering, Faculty of Materials Science and Engineering, Warsaw University of Technology, Nowowiejska 15/19, 00-665 Warszawa, Poland
Interests: design and implementation of surface treatments (including PDT, PACVD, nitriding, carbonitriding, glow discharge oxycarbonitriding); analysis of surface layers; tribology

Special Issue Information

Dear Colleagues,

Thin-film tribology is crucial for enhancing the performance, reliability, and lifespan of modern mechanical components operating under demanding conditions. This Special Issue focuses on a systematic study of ceramic thin films—carbides, nitrides, and oxides—along with diamond-like carbon (DLC) films, aiming to elucidate their friction, wear, and lubrication mechanisms across varying contact stresses, temperatures, and environments. Ceramic coatings, such as TiN, CrN, and Al₂O₃, provide exceptional hardness, thermal stability, and oxidation resistance, but can exhibit brittleness and tribochemical instability under severe sliding conditions. DLC films, on the other hand, offer ultra-low friction and excellent wear resistance due to their amorphous carbon structure, though their performance is highly sensitive to temperature, humidity, and interfacial chemistry.

The research will combine advanced deposition methods with comprehensive tribological testing and multiscale characterization to establish clear structure–property–performance relationships. Particular focus will be placed on interfacial phenomena and tribochemical processes, including transfer-layer formation, phase transformations, and tribo-oxidation. The results are expected to provide both fundamental insights and practical guidelines for designing next-generation low-friction, wear-resistant thin-films for high-performance engineering applications, including aerospace components, advanced energy systems, precision machining tools, microelectromechanical systems (MEMS), and biomedical devices.

Dr. Nay Win Khun
Dr. Krzysztof Kulikowski
Guest Editors

Manuscript Submission Information

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Keywords

  • thin films
  • ceramics
  • DLC
  • friction
  • wear

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Published Papers (1 paper)

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Research

19 pages, 7968 KB  
Article
Optimizing the Wide-Temperature Tribological Properties of HfO2/WS2 Coatings by Tuning Deposition Pressure
by Haibo Yu, Xiaopeng Zhang, Haichao Cai, Lulu Pei, Yujun Xue and Jing Liu
Lubricants 2026, 14(4), 150; https://doi.org/10.3390/lubricants14040150 - 31 Mar 2026
Viewed by 390
Abstract
To enhance the wear resistance and load-bearing capacity of WS2 coatings, this paper employs unbalanced magnetron sputtering technology to fabricate HfO2/WS2 composite coatings by regulating the deposition pressure (0.6–1.4 Pa), leveraging the superior properties of HfO2. The [...] Read more.
To enhance the wear resistance and load-bearing capacity of WS2 coatings, this paper employs unbalanced magnetron sputtering technology to fabricate HfO2/WS2 composite coatings by regulating the deposition pressure (0.6–1.4 Pa), leveraging the superior properties of HfO2. The microstructure, mechanical properties, and tribological behavior across a wide temperature range (room temperature to 450 °C) are systematically investigated. The results demonstrate that deposition pressure significantly modulates the coating structure and properties. At a deposition pressure of 0.6 Pa, a pronounced secondary bombardment effect leads to coarse surface particles, a thickness of only 1.525 μm, and a high hardness of 9.332 GPa, but inferior tribological performance with an average friction coefficient of 0.703. When the deposition pressure is increased to 1.4 Pa, the secondary bombardment effect weakens, resulting in an increased coating thickness of 2.125 μm, a decreased hardness of 3.88 GPa, and a significantly improved friction coefficient of 0.072. At an optimal deposition pressure of 1.0 Pa, the sputtered atoms possess moderate energy and optimal surface mobility, promoting the formation of a dense structure. The coating demonstrates a synergistic balance between mechanical load-bearing capability (hardness: 6.38 GPa) and a highly crystalline WS2 structure, yielding superior frictional behavior characterized by a mean coefficient of friction (COF) of merely 0.062. High-temperature tribological evaluations indicate that the COF displays a non-monotonic trend, declining at first before ascending as the temperature elevates. A minimum value of 0.015 is reached at 300 °C, corresponding to a wear rate of 1.127 × 10−8 mm3·N−1·m−1. At 450 °C, partial oxidation of WS2 to WO3 causes the friction coefficient to rise to 0.045, accompanied by fluctuations. Microstructural analysis confirms that HfO2 doping effectively suppresses the oxidation of WS2 at elevated temperatures and promotes the preferred growth orientation of the WS2(002) plane, thereby synergistically optimizing the wide-temperature-range lubrication performance of the coating. This study provides a novel technical approach for the design of lubricating coatings intended for high-temperature and harsh operating conditions, such as those encountered in aero-engine bearings. Full article
(This article belongs to the Special Issue Advances in Thin Film Tribology)
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