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Functional Coatings, Volume 1
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Functional Coatings, Volume 1

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Surface Sciences and Technology".

Deadline for manuscript submissions: closed (30 September 2023) | Viewed by 13565

Special Issue Editor

Dr. Shiladitya Paul

E-Mail Website
Guest Editor
1. Materials Innovation Centre, School of Engineering, University of Leicester, Leicester LE1 7RH, UK
2. Materials Performance and Integrity Technology Group, TWI Ltd., Cambridge CB21 6AL, UK
Interests: new materials development; thermal spray coatings; corrosion; electrochemistry; batteries; CCUS; CO2 conversion; high entropy alloy coatings
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Coatings often allow process equipment to be purposeful in environments well beyond the operational limit of uncoated components. In addition to protection, some coatings also provide additional functions, such as sensors. Durability, ease of application, repairability, reliability, and long-term performance of such coatings are vital to their application. The overall cost-effectiveness of these functional coatings is key to their industrial uptake. Therefore, this Special Issue of Applied Sciences, “Functional Coatings” is devoted to research and review articles on the metallic, non-metallic, and composite coatings used in various environments.

In particular, the topics of interest include but are not limited to:

  • Coatings for temperature-sensing applications;
  • Photoactive coatings;
  • Self-healing coatings;
  • Corrosion-, wear-, and cavitation-resistant coatings;
  • Coatings for aeroengine turbines, such as thermal barrier coatings;
  • Coatings for thermal management;
  • High-entropy alloy coatings.

Dr. Shiladitya Paul
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. Applied Sciences is an international peer-reviewed open access semimonthly 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 2400 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

  • corrosion
  • coatings
  • electrochemistry
  • thermal spraying

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Published Papers (4 papers)

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Research

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11 pages, 2398 KiB  
Article
Research on Thermal and Heat Insulation Properties of Aerogel Heat-Insulating Reflective Coatings
by Yun-Lin Liu, Ding-Guo Yang, Dong-Hua Wang and Xuan Liu
Appl. Sci. 2023, 13(17), 9700; https://doi.org/10.3390/app13179700 - 28 Aug 2023
Cited by 3 | Viewed by 2604
Abstract
This study aims to investigate the heat and thermal insulation mechanisms of aerogel heat-insulating reflective coatings. Two working conditions, the hot box method and the open environment at the hot end, were simulated using a gypsum board as the substrate. We conducted thermal [...] Read more.
This study aims to investigate the heat and thermal insulation mechanisms of aerogel heat-insulating reflective coatings. Two working conditions, the hot box method and the open environment at the hot end, were simulated using a gypsum board as the substrate. We conducted thermal tests on blank panels, composite panels with aerogel heat-insulating reflective coatings, and XPS-insulated composite panels for two operating conditions. And the thermal insulation power calculation was carried out for the reflective and barrier materials. The test results show that the air temperature differences between the hot and cold ends of the blank, aerogel coating, and XPS boards under the hot box method were 28.8 °C, 38.2 °C, and 55.2 °C, respectively, and that the air temperature differences between the cold ends of the coating and XPS panels under the natural environment heating condition were 24.2 °C and 24 °C, respectively. Theoretical calculations show that the aerogel heat-insulating reflective coatings produce a net radiative cooling power of 145.9 W/m² when the surface of the specimen is at the same temperature as the ambient temperature. The heat flux powers of the aerogel coating board and XPS panel were 9.55 W/m² and 1.65 W/m² when the temperature difference between the two surfaces on both sides of the specimen was 10 °C, respectively. Full article
(This article belongs to the Special Issue Functional Coatings, Volume 1)
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13 pages, 18156 KiB  
Article
Study on the Surface Morphology of Thermochromic Rf-Sputtered VO2 Films Using Temperature-Dependent Atomic Force Microscopy
by Emmanouil Gagaoudakis, Elisseos Verveniotis, Yuji Okawa, Giannis Michail, Elias Aperathitis, Eleni Mantsiou, George Kiriakidis and Vassilios Binas
Appl. Sci. 2023, 13(13), 7662; https://doi.org/10.3390/app13137662 - 28 Jun 2023
Viewed by 1109
Abstract
Vanadium dioxide (VO2) is a well-known phase-changing material that goes from a semiconducting state to a metallic one at a critical temperature of 68 °C, which is the closest to room temperature (25 °C). The electrical transition is also accompanied by [...] Read more.
Vanadium dioxide (VO2) is a well-known phase-changing material that goes from a semiconducting state to a metallic one at a critical temperature of 68 °C, which is the closest to room temperature (25 °C). The electrical transition is also accompanied by structural and optical changes. The optical transition upon heating-also known as thermochromism-makes VO2 a possible coating for “intelligent” windows. In this work, the relationship between the thermochromic performance of VO2 films and the surface morphology was investigated using Temperature-dependent Atomic Force Microscopy (T-AFM) in conjunction with the X-ray Diffraction technique and Scanning Electron Microscopy. In particular, VO2 films were deposited using the rf sputtering technique on Silicon and glass substrates at a substrate temperature of 300 °C, which is one of the lowest for this technique to grow the thermochromic monoclinic phase of VO2. It was found that upon heating (25–100 °C), there was a decrease in RMS roughness for all films independent from the substrate; the value of RMS roughness, however, varied depending on the substrate. Finally, the thermochromic parameters of the VO2 films were correlated with the surface morphology and appeared to be dependent on the kind of substrate used. Full article
(This article belongs to the Special Issue Functional Coatings, Volume 1)
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29 pages, 15825 KiB  
Article
Microstructural Properties and Wear Resistance of Fe-Cr-Co-Ni-Mo-Based High Entropy Alloy Coatings Deposited with Different Coating Techniques
by Gifty Oppong Boakye, Laura E. Geambazu, Arna M. Ormsdottir, Baldur G. Gunnarsson, Ioana Csaki, Francesco Fanicchia, Danyil Kovalov and Sigrun N. Karlsdottir
Appl. Sci. 2022, 12(6), 3156; https://doi.org/10.3390/app12063156 - 19 Mar 2022
Cited by 18 | Viewed by 4857
Abstract
Materials can be subjected to severe wear and corrosion due to high temperature, high pressure and mechanical loads when used in components for the production of geothermal power. In an effort to increase the lifetime of these components and thus decrease cost due [...] Read more.
Materials can be subjected to severe wear and corrosion due to high temperature, high pressure and mechanical loads when used in components for the production of geothermal power. In an effort to increase the lifetime of these components and thus decrease cost due to maintenance High-Entropy Alloy Coatings (HEACs) were developed with different coating techniques for anti-wear properties. The microstructure, mechanical and tribological properties of CoCrFeNiMox (at% x = 20, 27) HEACs deposited by three different technologies—high-velocity oxygen fuel (HVOF), laser cladding (LC) and electro-spark deposition (ESD)—are presented in this study. The relationship between surface morphology and microstructural properties of the as-deposited coatings and their friction and wear behavior is assessed to evaluate their candidacy as coatings for the geothermal environment. The wear rates were lower for the HVOF coatings compared to LC and ESD-produced coatings. Similarly, a higher hardness (445 ± 51 HV) was observed for the HVOF HEACs. The mixed FCC, BCC structure and the extent of σ + µ nano precipitates are considered responsible for the increased hardness and improved tribological performance of the HEACs. The findings from the study are valuable for the development of wear-resistant HEAC for geothermal energy industry applications where high wear is encountered. Full article
(This article belongs to the Special Issue Functional Coatings, Volume 1)
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Review

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21 pages, 427 KiB  
Review
Inspection of Coated Hydrogen Transportation Pipelines
by Shaik Asaaduddin Khwaja and Shiladitya Paul
Appl. Sci. 2022, 12(19), 9503; https://doi.org/10.3390/app12199503 - 22 Sep 2022
Cited by 6 | Viewed by 4116
Abstract
The growing need for hydrogen indicates that there is likely to be a demand for transporting hydrogen. Hydrogen pipelines are an economical option, but the issue of hydrogen damage to pipeline steels needs to be studied and investigated. So far, limited research has [...] Read more.
The growing need for hydrogen indicates that there is likely to be a demand for transporting hydrogen. Hydrogen pipelines are an economical option, but the issue of hydrogen damage to pipeline steels needs to be studied and investigated. So far, limited research has been dedicated to determining how the choice of inspection method for pipeline integrity management changes depending on the presence of a coating. Thus, this review aims to evaluate the effectiveness of inspection methods specifically for detecting the defects formed uniquely in coated hydrogen pipelines. The discussion will begin with a background of hydrogen pipelines and the common defects seen in these pipelines. This will also include topics such as blended hydrogen-natural gas pipelines. After which, the focus will shift to pipeline integrity management methods and the effectiveness of current inspection methods in the context of standards such as ASME B31.12 and BS 7910. The discussion will conclude with a summary of newly available inspection methods and future research directions. Full article
(This article belongs to the Special Issue Functional Coatings, Volume 1)
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