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Coatings
Special Issues
Characterization and Manufacturing of Nano-Composites and Nano-Composite Coatings
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Characterization and Manufacturing of Nano-Composites and Nano-Composite Coatings

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Surface Engineering for Energy Harvesting, Conversion, and Storage".

Deadline for manuscript submissions: 15 September 2024 | Viewed by 7823

Special Issue Editor

Dr. Nikolaos Karkalos

E-Mail Website
Guest Editor
School of Mechanical Engineering, National Technical University of Athens, 15780 Zografou, Greece
Interests: molecular dynamics; finite element method; machining processes; non-conventional machining processes; material testing; hard-to-cut materials; multiscale modeling of machining; abrasive processes
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Coatings are essential in many demanding engineering applications in high-end industries, such as the automotive, aerospace, and biomedical ones, in order to ensure appropriate function of contacting surfaces for an adequately long period of time under challenging operating conditions. For this reason, research in this scientific field is also focused on the development of novel coating materials, such as nanocomposite materials, which can be fabricated from appropriate matrix and reinforcement materials, in order to obtain favorable properties for enhanced performance of the contacting surfaces.

In order to evaluate the suitability of developed coating materials and determine their most appropriate applications, tests should be carried out regarding the mechanical, tribological, chemical or electrochemical behavior of these materials. Moreover, new methods of nanocomposite coatings fabrication, even non-conventional ones, can be designed and tested, either experimentally or by employing accurate simulation models, in order to achieve higher efficiency.

In this Special Issue, original research articles and reviews are welcome. This Special Issue is intended to serve as a forum for papers pertinent, but not limited, to the following concepts:

  • Experimental and numerical studies on the synthesis of novel nanocomposite materials;
  • Recent developments on nanocomposite coatings for the automotive, aerospace, and biomedical industries;
  • Characterization procedures of nanocomposite materials for coatings, for example, regarding mechanical properties and fatigue, macro and micro hardness, surface integrity, tribological properties and wear, corrosion, wettability, biocompatibility;
  • Conventional and non-conventional processes for the production of coatings based on nanocomposite materials and optimization studies regarding the improvement of the efficiency of these processes;
  • Theoretical models and simulations for explaining the behavior of nanocomposite materials or the performance of nanocomposite coatings;
  • Machinability of parts with nanocomposite coatings;
  • Evaluation of the performance of parts with coated surfaces, such as cutting tools, dies or implants, among others, in real cases through experimental or numerical studies.

We look forward to receiving your contributions.

Dr. Nikolaos Karkalos
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

  • synthesis of nanocomposite materials
  • coating materials testing procedures
  • optimization of nanocomposite coating production processes
  • machinability of coated surfaces
  • modeling of nanocomposite coating materials

Published Papers (5 papers)

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Research

10 pages, 4037 KiB  
Article
Determination of the Size of Complex Iron Oxide Nanoparticles Using Various Physical Experimental Methods
by Airat G. Kiiamov, Anna G. Ivanova, Alexander N. Solodov, Mikhail A. Cherosov, Dmitrii A. Tayurskii and Artur Khannanov
Coatings 2023, 13(9), 1589; https://doi.org/10.3390/coatings13091589 - 12 Sep 2023
Viewed by 762
Abstract
A series of organically coated iron oxide nanoparticles obtained via the thermal decomposition of iron–oleate complexes via a “heating-up” process were investigated using the methods of transmission electron microscopy, X-ray diffraction and fine magnetometry, accompanied by elaborate mathematical analysis. The analysis of dependencies [...] Read more.
A series of organically coated iron oxide nanoparticles obtained via the thermal decomposition of iron–oleate complexes via a “heating-up” process were investigated using the methods of transmission electron microscopy, X-ray diffraction and fine magnetometry, accompanied by elaborate mathematical analysis. The analysis of dependencies of field dependencies on the magnetization of the shape and broadening of maxima of X-ray diffraction patterns and fine refinement of transmission electron microscopy data allowed us to demonstrate that all of the samples under consideration had a tripartite structure: (i) the magnetic crystalline core of iron oxide, (ii) the paramagnetic stratum of amorphous iron oxide and (iii) the organic coater. The new approach toward synthesis for organic coated iron oxide shows that it could be applied to the preparation of magnetic nanoparticles with different and controlled magnetic properties and sizes depending on necessary applications, especially biomedical. Full article
(This article belongs to the Special Issue Characterization and Manufacturing of Nano-Composites and Nano-Composite Coatings)
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16 pages, 7107 KiB  
Article
Evolution of the Growth of a Micro-Nano Crystalline Diamond Film on an Axial Carbide Tool Model in Microwave Plasma
by Evgeny E. Ashkinazi, Sergey V. Fedorov, Artem K. Martyanov, Vadim S. Sedov, Alexey F. Popovich, Andrey P. Bolshakov, Dmitry N. Sovyk, Stanislav G. Ryzhkov, Andrey A. Khomich, Evgeny V. Zavedeev, Artem P. Litvinov, Vladimir Y. Yurov, Sergey N. Grigoriev and Vitaly I. Konov
Coatings 2023, 13(7), 1156; https://doi.org/10.3390/coatings13071156 - 26 Jun 2023
Viewed by 924
Abstract
Conformal multilayer micro-nanocrystalline diamond coatings were grown on substrates of a hard alloy with 9% Co with a high aspect number in microwave plasma from gas mixtures CH4/H2 and CH4/H2/N2. The substrates were of a cylindrical axial tool model with a size ratio: [...] Read more.
Conformal multilayer micro-nanocrystalline diamond coatings were grown on substrates of a hard alloy with 9% Co with a high aspect number in microwave plasma from gas mixtures CH4/H2 and CH4/H2/N2. The substrates were of a cylindrical axial tool model with a size ratio: d = 12 mm to l = 75 mm. An original tool holder made of molybdenum, in the form of a sector of the excessive ring with the axis of the hole parallel to the central conductive platform, protects part of the substrate from heating due to the edge effect of plasma. The uniformity of heating of the growth part, which is located inside the excessive ring, is calculated using mathematical modeling and is provided by rotation at a speed of at least 12 rpm, which ensures the uniformity of the coating. The average grain size of the nanocrystalline film measured along the cylinder forming was 41 nm. Full article
(This article belongs to the Special Issue Characterization and Manufacturing of Nano-Composites and Nano-Composite Coatings)
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24 pages, 8332 KiB  
Article
Influence of Silver-Coated Tool Electrode on Electrochemical Micromachining of Incoloy 825
by Geethapriyan Thangamani, Muthuramalingam Thangaraj, Palani Iyamperumal Anand, Mani Jayakumar, Nikolaos E. Karkalos, Emmanouil L. Papazoglou and Panagiotis Karmiris-Obratański
Coatings 2023, 13(5), 963; https://doi.org/10.3390/coatings13050963 - 21 May 2023
Cited by 3 | Viewed by 1221
Abstract
Incoloy 825 alloy is often used in calorifiers, propeller shafts, and tank vehicles owing to the improved resistance to aqueous corrosion. The electrochemical micromachining process can be utilized to machine such an engineering material owing to higher precision and lower tool wear. In [...] Read more.
Incoloy 825 alloy is often used in calorifiers, propeller shafts, and tank vehicles owing to the improved resistance to aqueous corrosion. The electrochemical micromachining process can be utilized to machine such an engineering material owing to higher precision and lower tool wear. In the present study, an investigation was performed to enhance the process of creating micro-holes using silver-coated copper tool electrodes. The sodium nitrate electrolyte was used under different levels of input parameters such as voltage, electrolyte concentration, frequency, and duty cycle with a view to improving material removal rate, conicity, overcut, and circularity. It was found that silver-coated copper tool electrode had a high material removal rate (MRR), better overcut, conicity, and circularity compared to uncoated copper tools in most cases, due to its high corrosive resistance and electrical conductivity. From SEM and EDS analysis, it was observed that better surface topography of the micro-holes is obtained with silver-coated copper tool electrode while machining Incoloy 825 alloy in the micromachining process. Full article
(This article belongs to the Special Issue Characterization and Manufacturing of Nano-Composites and Nano-Composite Coatings)
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9 pages, 5940 KiB  
Article
ZIF-67 Derived Co-Ni/C Composites for High-Efficiency Broadband Microwave Absorption
by Qingwei Liu, Yiming Zhao, Zhao Fan, Jiali Yu and Min Zeng
Coatings 2022, 12(11), 1667; https://doi.org/10.3390/coatings12111667 - 03 Nov 2022
Cited by 3 | Viewed by 2036
Abstract
The development of broadband and high-efficiency broadband microwave-absorbing materials is one of the keys to resisting electromagnetic radiation and electromagnetic interference. In this paper, we used zeolitic imidazolate framework-67 (ZIF-67) as the template to obtain Ni-doped ZIF-67 via Ni(NO3)2 etching [...] Read more.
The development of broadband and high-efficiency broadband microwave-absorbing materials is one of the keys to resisting electromagnetic radiation and electromagnetic interference. In this paper, we used zeolitic imidazolate framework-67 (ZIF-67) as the template to obtain Ni-doped ZIF-67 via Ni(NO3)2 etching followed by pyrolysis to prepare Co-Ni/C composites successfully. The morphology and microstructure of Co-Ni/C composites can be well-tuned by altering the Ni doping content. ZIF-67-derived Co-Ni/C porous materials exhibit extremely strong microwave absorption performance thanks to dielectric loss, magnetic loss, and the synergistic effect between different components. When the dosage of Ni(NO3)2 used reaches 0.32 g, the obtained composite possesses the optimal absorbing properties with a maximum reflection loss (RL) of −72.88 dB and an effective bandwidth (fe, representing RL ≤ −10 dB) of 7.04 GHz (9.76–16.8 GHz) corresponding to a thickness of 2.53 mm. The results of this work indicate that Co-Ni/C composites have potential application value in the field of microwave absorption. Full article
(This article belongs to the Special Issue Characterization and Manufacturing of Nano-Composites and Nano-Composite Coatings)
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13 pages, 2850 KiB  
Article
Optimization of Wire EDM Process Parameters on Cutting Inconel 718 Alloy with Zinc-Diffused Coating Brass Wire Electrode Using Taguchi-DEAR Technique
by Lijun Liu, Muthuramalingam Thangaraj, Panagiotis Karmiris-Obratański, Yuanhua Zhou, Ramamurthy Annamalai, Ryszard Machnik, Ammar Elsheikh and Angelos P. Markopoulos
Coatings 2022, 12(11), 1612; https://doi.org/10.3390/coatings12111612 - 23 Oct 2022
Cited by 13 | Viewed by 2296
Abstract
Inconel 718 alloy has a wide range of applications in the aerospace sector because of its superior mechanical properties and its weldability. The machining of such higher strength materials with complex shapes is possible with wire electrical discharge machining. In the present research, [...] Read more.
Inconel 718 alloy has a wide range of applications in the aerospace sector because of its superior mechanical properties and its weldability. The machining of such higher strength materials with complex shapes is possible with wire electrical discharge machining. In the present research, an endeavor was made to enhance the machining process by utilizing zinc-diffused coating brass wire electrode and Taguchi-Data Envelopment Analysis-based Ranking (DEAR) methodology in the process while machining Inconel 718 alloy. Material removal rate, kerf width, and surface roughness were considered as the quality measures. The optimal arrangement of input factors in the Wire Electrical Discharge Machining (WEDM) process were found as 140 µs (Ton), 50 µs (Toff), 60 V (SV), and 5 kg (WT) among the elected factors with the error accuracy of 1.1%. The pulse-off time has the most significance on formulating the quality measures owing to its importance on deionization in the process. Full article
(This article belongs to the Special Issue Characterization and Manufacturing of Nano-Composites and Nano-Composite Coatings)
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