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Coatings
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Microstructure, Thermal-Mechanical and Anti-wear Properties of Coatings
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Microstructure, Thermal-Mechanical and Anti-wear Properties of Coatings

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Corrosion, Wear and Erosion".

Deadline for manuscript submissions: closed (31 August 2023) | Viewed by 8981

Special Issue Editor

Dr. Fengming Du

E-Mail Website
Guest Editor
Marine Engineering College, Dalian Maritime University, Dalian 116026, China
Interests: coating structure; simulation; wear; metallurgy
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The coating is an important layer of material on the surface of the object, which protects the object and enhances the surface performance. The microstructure, thermal-mechanical properties and wear resistance of the coating itself determine the quality of the coating. This Special Issue, entitled “Microstructure, thermal-mechanical and anti-wearproperties of coatings”, will promote a platform for the sharing of knowledge among researchers in the field of coatings including theoretical analysis, numerical simulation, and experimental study. This Special Issue will cover a wide range of disciplines as follows:

  • Microstructure of coating materials;
  • Coating behavior using numerical and experimental methods;
  • Friction and wear of coatings;
  • Design of coating materials;
  • Thermal and mechanical property of coating;
  • Other aspects on coating material.

Dr. Fengming Du
Guest Editor

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. 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

  • structure
  • thermal-mechanical property
  • friction
  • wear
  • optimization
  • material

Published Papers (5 papers)

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Research

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10 pages, 3044 KiB  
Article
Flow and Heat Transfer on the Surface of Molten Steel Slag Layer in Continuous Casting Mold
by Guohui Li, Shanjiao Wang and Gengtao Zheng
Coatings 2023, 13(9), 1551; https://doi.org/10.3390/coatings13091551 - 05 Sep 2023
Cited by 1 | Viewed by 869
Abstract
Protective slag is coated on the surface of molten steel during continuous casting, the flow and heat transfer state of the protective slag is a decisive factor affecting the inflow and consumption of liquid slag and is also an important prerequisite for stabilizing [...] Read more.
Protective slag is coated on the surface of molten steel during continuous casting, the flow and heat transfer state of the protective slag is a decisive factor affecting the inflow and consumption of liquid slag and is also an important prerequisite for stabilizing and improving the quality of continuous casting billets. Based on the Navier Stokes fluid momentum conservation equation and energy equation, a two-dimensional longitudinal numerical model describing the flow/heat transfer of liquid protective slag on the surface of steel is established. The data comes from the equipment parameters and casting process of an arc shaped slab continuous casting machine in a domestic steel plant. The flow field and temperature field distribution of protective slag are calculated and analyzed, and the effects of factors such as slag layer thickness and shear speed on the flow and heat transfer status of the liquid slag layer are discussed. When the bottom shear velocity increases from 0.005 m/s to 0.2 m/s, the maximum flow velocity of liquid slag from the nozzle to the narrow surface in the center area of the model increases from 0.0012 m/s to 0.0617 m/s, and the average longitudinal flow velocity of liquid slag near the nozzle increases from 0.0012 m/s to 0.0627 m/s. The research results provide reference for investigating the complex metallurgical behavior of protective slag. Full article
(This article belongs to the Special Issue Microstructure, Thermal-Mechanical and Anti-wear Properties of Coatings)
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13 pages, 15736 KiB  
Article
The Influence of Ni Content on the Microstructure and Impact Wear Resistance Performance of High-Chromium Casting Infiltration Coating
by Chong Chen, Tao Wang, Shizhong Wei, Feng Mao, Wenliang Liu, Mei Xiong, Tao Jiang, Liqiang Xiao, Xiaodong Wang and Cheng Zhang
Coatings 2022, 12(9), 1313; https://doi.org/10.3390/coatings12091313 - 08 Sep 2022
Viewed by 1157
Abstract
Casting infiltration technology was used to fabricate a high-chromium coating on the surface of parent ZG45 steel with different Ni content. SEM, EDS analysis, CALPHAD-type calculations, Rockwell hardness test and impact wear test were utilized to investigate the influence of Ni on the [...] Read more.
Casting infiltration technology was used to fabricate a high-chromium coating on the surface of parent ZG45 steel with different Ni content. SEM, EDS analysis, CALPHAD-type calculations, Rockwell hardness test and impact wear test were utilized to investigate the influence of Ni on the microstructure, hardness and impact wear resistance performance. The as-cast microstructure of the casting infiltration coatings with Ni content less than 2.82 wt.% was a pearlite matrix with reticular eutectic M7C3 carbide, while the matrix of the coatings with 5.53 wt.% Ni showed austenite. The content of Ni had little effect on both the solidification behavior and the amount of eutectic M7C3. After heat treatment, the transformation of the matrix to martensite occurred, and the Rockwell hardness significantly increased. The proportion of the retained austenite in the casting infiltration coatings increased from 6.4 vol.% to 27.5 vol.% with increasing Ni content, resulting in a decrease in the hardness. Due to a better balance of the hardness and toughness, the casting infiltration coating with 1.53 wt.% Ni showed the best impact wear resistance performance. Full article
(This article belongs to the Special Issue Microstructure, Thermal-Mechanical and Anti-wear Properties of Coatings)
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16 pages, 8678 KiB  
Article
Effect of Si and P Content on the Si Phase and Solidification Behavior of Al-40Zn-xSi Alloys Using Synchrotron Radiation Real-Time Imaging
by Feng Mao, Junliang Guo, Guoshang Zhang, Po Zhang, Mei Xiong, Chong Chen, Changji Wang and Liqiang Xiao
Coatings 2022, 12(8), 1127; https://doi.org/10.3390/coatings12081127 - 05 Aug 2022
Cited by 1 | Viewed by 1184
Abstract
In this paper, the effect of Si (1, 3, 5, 6 wt.%) and P (5, 10, 15, 20, 30 ppm) content on the Si phase and solidification behavior of Al-40Zn-xSi alloys are investigated via phase diagram calculation, scanning electron microscopy (SEM) and synchrotron [...] Read more.
In this paper, the effect of Si (1, 3, 5, 6 wt.%) and P (5, 10, 15, 20, 30 ppm) content on the Si phase and solidification behavior of Al-40Zn-xSi alloys are investigated via phase diagram calculation, scanning electron microscopy (SEM) and synchrotron radiation real-time imaging. It is found that Si content has a great influence on the microstructures of Al-40Zn-xSi alloys, and two distinct primary phases were separated by a critical composition at 5.49 wt.% Si in the calculated phase diagram. The microstructure contained not only needle-like eutectic Si, but also blocky primary Si particles in “hypoeutectic” commercial-purity Al-40Zn-5Si alloys. However, the synchrotron radiation real-time imaging experiment showed that the primary phase was α-Al in commercial-purity Al-40Zn-5Si alloys. The effect of P on the Si phase of the high-purity Al-40Zn-5Si alloy was also studied, showing that the number and size of the blocky primary Si particles in the high-purity “hypoeutectic” Al-40Zn-5Si alloys were mainly related to the P impurity content. A small minority of primary Si particles were found during the whole solidification process of the high-purity Al-40Zn-5Si alloy without P impurities, while a large number of primary Si particles were precipitated continuously at the front of α-Al dendrites in the high-purity Al-40Zn-5Si alloy with the addition of 20ppm P, which may have been caused by the fact that AlP particles can act as the heterogeneous nucleation sites of primary Si particles by a small undercooling in P-impurity-containing alloys. Full article
(This article belongs to the Special Issue Microstructure, Thermal-Mechanical and Anti-wear Properties of Coatings)
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Review

Jump to: Research

22 pages, 2121 KiB  
Review
Micro-Arcs Oxidation Layer Formation on Aluminium and Coatings Tribological Properties—A Review
by Louis Rodriguez, Jean-Yves Paris, Jean Denape and Karl Delbé
Coatings 2023, 13(2), 373; https://doi.org/10.3390/coatings13020373 - 06 Feb 2023
Cited by 10 | Viewed by 2114
Abstract
This review proposes to carry out a state-of-the-art associated with micro-arc oxidation. Firstly, the different aspects of the growth mechanisms of the oxides are detailed. Then, the formation of micro-arcs and the case of soft-spark treatment are discussed. Then, the electrolytic reactions involved [...] Read more.
This review proposes to carry out a state-of-the-art associated with micro-arc oxidation. Firstly, the different aspects of the growth mechanisms of the oxides are detailed. Then, the formation of micro-arcs and the case of soft-spark treatment are discussed. Then, the electrolytic reactions involved in the layer construction are outlined. We focused on the influence of aluminium alloys on the appearance of the coating and its characteristics before considering the electrolyte formulation. We have concentrated some of our efforts on silicate-based electrolytes, mainly used in research and industry. The importance of electrical parameters in layer formation is detailed later. The main factors studied in the literature are the current source, current density, treatment frequency and duration, and duty cycle. We have also noted the different phase compositions identified in the literature. Finally, since the process is particularly advantageous for protecting the surfaces of aluminium parts against wear, we conclude this review by presenting work on the tribological properties of this coating. In this final section, we highlight the work on the wear-reducing properties and tribological mechanisms identified in the literature. Particular attention is paid to the relationship between the nature of the substrates used, the role of the electrolyte and the counterpart choice on the friction and wear results. Full article
(This article belongs to the Special Issue Microstructure, Thermal-Mechanical and Anti-wear Properties of Coatings)
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15 pages, 3519 KiB  
Review
Overview of Friction and Wear Performance of Sliding Bearings
by Fengming Du, Dawei Li, Xiaoxia Sa, Cong Li, Yang Yu, Chengdi Li, Jingsi Wang and Weiwei Wang
Coatings 2022, 12(9), 1303; https://doi.org/10.3390/coatings12091303 - 05 Sep 2022
Cited by 9 | Viewed by 3127
Abstract
Sliding bearings are critical components of the internal combustion engine. Friction and wear occur in the contact area between the shaft and the bearing. Significant wear can occur in poor working conditions or after a long service time, leading to the failure of [...] Read more.
Sliding bearings are critical components of the internal combustion engine. Friction and wear occur in the contact area between the shaft and the bearing. Significant wear can occur in poor working conditions or after a long service time, leading to the failure of the sliding bearing and affecting the reliability of the machinery. It is essential to investigate the wear performance of sliding bearings, understand their wear mechanism, predict their service life, and select wear-resistant materials and surface treatments. This paper reviews the current status and prospects of sliding bearing wear research, focusing on the classification of sliding bearing wear tests, wear testing machines, wear test research, wear prediction models, and future research prospects. Full article
(This article belongs to the Special Issue Microstructure, Thermal-Mechanical and Anti-wear Properties of Coatings)
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