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Special Issue Editors

Dr. Yang Li

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Guest Editor

Nuclear Equipment Department,Yantai University, Yantai 264005, China
Interests: multi-arc ion plating; transition metal nitrides coatings; multilayered structures; plasma surface modified; lubricant

Prof. Dr. Yongyong He

E-Mail Website
Guest Editor

State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing, China
Interests: surface modified; lubricant; chemical-mechanical polishing; super smooth surface manufacturing

Special Issue Information

Dear Colleagues,

Low-temperature plasma comprises ionized gases, including electrons, ions, molecules, neutral, and other gas groups. It is generally electrically neutral and it is called the "fourth state" of matter. Use the energy of electrons, ions, and free atoms in the plasma to induce chemical reactions or physical reactions and cause a collision, scattering, excitation, crystallization, and amorphization on the material surface to change the morphology, chemical composition, and structure in order endow the material with new surface properties. Plasma surface engineering includes plasma chemical heat treatment, ion implantation, plasma-enhanced physical (or chemical) vapor deposition, plasma spraying, micro-arc oxidation, plasma activation, and other technologies. With the upgrading of equipment, many vital components face a series of harsh working conditions such as friction and wear, high load and high speed, and lubrication failure, which requires an in-depth study of friction and wear behavior, the failure mechanism of the strengthening layer, etc.

In this Special Issue, we seek outstanding research that contributes to an in-depth understanding of these complex tribological phenomena. We focus on research that studies the root causes of wear and failure in the modified layers and coatings. We are also looking for the latest advancements in high-performance plasma surface engineering that can resist wear and provide protection and lubrication. We invite all researchers interested in widely understood plasma surface engineering to present their results related to experimental and theoretical studies.

Dr. Yang Li
Prof. Dr. Yongyong He
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. Lubricants 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

friction
lubrication
wear
plasma surface engineering
coatings

Published Papers (2 papers)

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Research

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17 pages, 7151 KiB

Open AccessArticle

An Investigation into the Wear Behavior of Martensitically Transformed Nitrided Layers

by Stefanie Hoja, Behrad Komeili Birjandi, Henning Hasselbruch and Jérémy Epp

Lubricants 2023, 11(11), 481; https://doi.org/10.3390/lubricants11110481 - 7 Nov 2023

Cited by 1 | Viewed by 1481

Abstract

To improve the service behavior of gears, surface heat treatments such as nitriding or induction hardening can be performed. Since these processes are limited in their achievable maximum hardness or depth of hardness, a combination treatment could allow benefits from the advantages of both processes. The aim of this work was to show the correlation between the microstructure resulting from combination treatment and the performance of the surface layer using the example of wear behavior. The investigations focused on the impact of different nitrided states, in the combination treatment of the material EN31CrMoV9, on wear resistance. The wear was evaluated after running the two-disc test gravimetrically and optically. Nitrided-only specimens showed better wear resistance compared to those subjected to induction hardening after nitriding. Substantial differences in weight loss indicate that induction hardening worsens the wear behavior. The variants with the compound layer removed in the nitride-only state as well as in the induction hardened state showed a better wear behavior compared to the respective conditions with a compound layer. This was attributed to the lower surface roughness and the higher hardness due to less retained austenite after combination treatment. Full article

(This article belongs to the Special Issue Advances in Plasma Surface Treatment and Modification)

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Review

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34 pages, 12958 KiB

Open AccessReview

Solid Lubrication System and Its Plasma Surface Engineering: A Review

by Yang Li, Zelong Zhou and Yongyong He

Lubricants 2023, 11(11), 473; https://doi.org/10.3390/lubricants11110473 - 3 Nov 2023

Cited by 2 | Viewed by 1743

Abstract

In aerospace, aviation, nuclear power, and other high-tech fields, some essential moving parts must operate under high vacuum, high load, intense radiation, and other conditions. Under such extreme conditions, only solid lubricating materials can meet the lubrication requirements. Traditional material modification methods have problems such as high energy consumption, severe pollution, and narrow scope of application. Plasma modification technology can overcome these shortcomings. This paper focuses on several commonly used plasma preparation techniques for solid lubricating coatings, including plasma chemical heat treatment, physical vapor deposition, plasma immersion ion implantation and deposition, plasma spraying, and plasma electrolytic oxidation. Subsequently, the material systems of metal-based solid lubrication coatings are reviewed: soft metals, oxides, sulfides, nitrides, and carbon-based materials. Finally, found that the development of new solid lubricants, the improvement of existing preparation technology, and the development of new processes are the key development directions in the future. Full article

(This article belongs to the Special Issue Advances in Plasma Surface Treatment and Modification)

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