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Mechanical and Tribological Properties of Advanced Materials and Coatings—Second Edition

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Mechanics of Materials".

Deadline for manuscript submissions: closed (20 February 2024) | Viewed by 1030

Special Issue Editor


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Guest Editor
Functional Materials and Tribology Laboratory, Department of Mechanical Engineering, Chosun University, 309 Pilmun-daero, Dong-gu, Gwangju 61452, Republic of Korea
Interests: micro/nanomaterials; functional materials; flexible electrode; micro/nanostructure; micro/nano patterning; surface treatment/coating; friction; wear; lubrication; in situ visualization
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Special Issue Information

Dear Colleagues,

Various materials such as metals, ceramics, polymers, and micro/nano materials can be synthesized or mixed into alloys or composites to improve various properties. In addition, the surface of the materials can be protected through various surface treatment/patterning and surface coating techniques. However, the condition in which two objects are in contact is a particularly complex state due to various factors, such as material properties, surface roughness, contact pressure, sliding speed, ambient atmosphere/temperature/humidity, etc. Therefore, it is difficult to cover a complex contact state only by setting one condition of the material itself. A number of studies are being conducted using theoretical, numerical/analytic, and experimental methods to improve mechanical and tribological properties of materials and coatings. Methods for improving the mechanical and tribological properties of materials and coatings include using various materials with excellent mechanical properties, friction and wear properties, or forming micro/nanopatterns, structures, and multilayers. In particular, the durability of the surface can be improved by understanding complex contact conditions and analyzing various mechanisms for friction and wear phenomena. In other words, it means that an extraordinarily strong material is used to protect the part where contact occurs from damage, or conversely, a material that is flexible to deformation is used to reduce the contact pressure.

In the second edition of this Special Issue, we will continue the successful series of publications focused on preventing surface damage and improving mechanical and tribological properties using a wide range of materials, surface treatment/patterning, and coating technologies.

We look forward to receiving your contributions to this Special Issue.

Dr. Chang-Lae Kim
Guest Editor

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Keywords

  • micro/nano materials
  • functional materials
  • micro/nano structure
  • micro/nanopatterning
  • surface treatment
  • coatings
  • finite element analysis
  • tribological properties
  • mechanical properties

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Published Papers (1 paper)

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Research

14 pages, 8033 KiB  
Article
Impact of Tribological Conditions on Collagen Coating Self-Healing
by Sung-Jun Lee and Chang-Lae Kim
Materials 2024, 17(6), 1341; https://doi.org/10.3390/ma17061341 - 14 Mar 2024
Viewed by 830
Abstract
The study examined the correlation between collagen coating damage and self-healing under various tribological conditions. It confirmed that the friction coefficient and degree of damage on the collagen coating varied based on contact and sliding conditions. The friction coefficient, measured at 0.56 for [...] Read more.
The study examined the correlation between collagen coating damage and self-healing under various tribological conditions. It confirmed that the friction coefficient and degree of damage on the collagen coating varied based on contact and sliding conditions. The friction coefficient, measured at 0.56 for a single sliding cycle under a 350 mN normal load, demonstrated a notable decrease to 0.46 for 2295 cycles under 30 mN, further reducing to 0.15 for 90 cycles under a 20 mN normal load. As the normal load increased, the friction coefficient decreased, and with repeated sliding cycles under the same load, the coefficient also decreased. Water droplets induced a self-healing effect on collagen coating, causing wear tracks to vanish as fibers absorbed water. Severe wear tracks, with broken fibers and peeled coating, showed limited self-healing. In contrast, mild wear tracks, with compressed yet connected fibers, exhibited the self-healing phenomenon, making the wear tracks disappear. Real-time observations during 90 cycles under a 20 mN normal load highlighted the formation of mild wear tracks with intact collagen fibers, providing quantitative insights into self-healing characteristics. To preserve the self-healing effect of the collagen coating, it is essential to ensure tribological conditions during contact and sliding that prevent the disconnection of collagen fibers. Full article
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