Design, Preparation, and Thermocapillary Migration Behavior of Lubricating Materials

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

Deadline for manuscript submissions: closed (1 January 2024) | Viewed by 1067

Special Issue Editors


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Guest Editor
National Key Laboratory of Science and Technology on Helicopter Transmission, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, China
Interests: tribology; lubricant migration; surface texturing; magnetic fluid; heat and mass transfer
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Guest Editor
Tribology Research Division, Institute of Engineering Design and Product Development, Vienna University of Technology, 1060 Vienna, Austria
Interests: tribology; surface engineering; 2D materials; solid lubricants; materials tribology; laser surface texturing; lubricant migration
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Thermocapillary migration is a very intriguing phenomenon, in which the variation in the surface tension of a liquid is affected such that the liquid is driven from low-tension regions to high-tension regions. This implies that a thermal gradient, which might occur on rubbing surfaces due to frictional heating, can induce a movement of liquid lubricants from a high-temperature region to a low-temperature region. This kind of migration is of central importance to many tribological applications. In some applications, such as mechanical seals, one may desire that the lubricant migrates in a predetermined direction induced by a temperature difference. In others, lubricant migration may need to be minimized to ensure that adequate lubrication is present where it is needed. Clearly, this concept has numerous applications in machinery from engines to compressors to mixers and in vital mechanical components, such as piston rings, bearings, hard disk, and so on. Investigation on the design, preparation, and thermocapillary migration behavior of lubricating materials are of vital importance for modern tribology systems.

In particular, the topic of interest includes but is not limited to:

  • Anti-migration coatings;
  • Migration barrier films;
  • Liquid and solid lubricants;
  • Fundamental lubrication at surfaces and interfaces;
  • Surface texturing;
  • Surface properties and characterization;
  • Micro/nano functional surfaces;
  • Fundamental and functional properties of surfaces and interfaces;
  • Tribology heat and mass transfer;
  • Fluid film lubrication;
  • Hydrodynamic lubrication;
  • Theoretical and computational modeling of lubricant migration.

In this Special Issue, original research articles, reviews, short notes, or communication are welcome.

We look forward to receiving your contributions.

Dr. Qingwen Dai
Dr. Philipp Grützmacher
Guest Editors

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Published Papers (1 paper)

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Research

13 pages, 22061 KiB  
Article
Water Lubrication of Al-Cu Composites Reinforced by Nickel-Coated Si3N4 Particles
by Yanan Peng, Qinqwen Dai, Wei Huang and Xiaolei Wang
Coatings 2024, 14(2), 225; https://doi.org/10.3390/coatings14020225 - 14 Feb 2024
Viewed by 667
Abstract
Silicon nitride (Si3N4) particle-reinforced aluminum–copper (Al-Cu) alloy matrix composites have been prepared in our previous works and experimental result shows that they can be used as a new kind of water-lubricated materials. However, the wettability between Si3N [...] Read more.
Silicon nitride (Si3N4) particle-reinforced aluminum–copper (Al-Cu) alloy matrix composites have been prepared in our previous works and experimental result shows that they can be used as a new kind of water-lubricated materials. However, the wettability between Si3N4 ceramics and Al-Cu alloys is poor and the manufacturing process is usually carried out at a high temperature of 1100 °C. To overcome this shortcoming, a layer of nickel was deposited on the surface of Si3N4 particles, forming a core-shell structure. Thus, the interface bonding property between Si3N4 and Al-Cu alloy can be improved and the lower sintering temperature can be applied. Si3N4/Al-Cu alloy composites with different proportions of Ni-coated Si3N4 were fabricated by powder matrix metallurgy technology at 800 °C, and the water lubrication properties of the composite were investigated. The experimental results show that with the increase in the particle content (10 wt%–40 wt%), the microhardness of the composites increased first and then decreased, while the porosity increased continuously. A low friction coefficient (0.001–0.005) can be achieved for the composites with the lower particle content (10 wt%–20 wt%). The major wear mechanism changes from the mechanically dominated wear during the running-in process to the tribochemical wear at the low frictional stage. Full article
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