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Coatings
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Thermal Spray Coatings
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Thermal Spray Coatings

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Plasma Coatings, Surfaces & Interfaces".

Deadline for manuscript submissions: closed (20 November 2023) | Viewed by 4487

Special Issue Editors

Prof. Dr. Corneliu Munteanu

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Guest Editor
Mechanical Engineering, Mechatronics and Robotics Department, ”Gheorghe Asachi” Technical University of Iasi, Iasi, Romania
Interests: thermal coatings; biomaterials; biodegradable materials; microstructural analysis; heat treatments
Special Issues, Collections and Topics in MDPI journals
Dr. Bogdan Istrate

E-Mail Website
Guest Editor
Faculty of Mechanical Engineering, ”Gheorghe Asachi” Technical University of Iasi, Bd. Dimitrie Mangeron, nr. 67, 700050 Iaşi, România
Interests: biomaterials; coatings; microstructure
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Surface engineering represents an important role in all types of applications in modern science and engineering. Coatings are used to optimize the functionality of materials and to improve the entire function of materials, for improved function through the coating at interfaces. Increasing demands for good mechanical properties, high corrosion resistance, and good biocompatibility by current applications ranging from aerospace, medical, automotive to chemical industries cause the necessity of development of new coatings in the fields of surface, heat, and thermochemical treatment of alloys. This Special Issue aims to present the latest findings and to promote further research in the areas of thermal coatings, including experimental characterization and theoretical calculations. Full papers, review articles, and communications are all welcome.

In particular, the topic of interest includes but is not limited to:

  • Surface and interface engineering to improve the materials’ performance;
  • Novel coatings for improving the performance of metals (i.e., wear, hardness, and corrosion resistance);
  • Advanced coating methods for metallic alloys;
  • Coatings with high biocompatibility for medical applications;
  • Performance of coatings in various high-temperature environments;
  • Influence of substrate and surface engineering techniques on the mechanical and microstructural properties of components;
  • The relationship between structure, properties, and materials’ applications;
  • Surface interface characterization.

Prof. Dr. Corneliu Munteanu
Dr. Istrate Bogdan
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. 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.

Published Papers (2 papers)

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Research

17 pages, 11204 KiB  
Article
Characterization and Control of Residual Stress in Plasma-Sprayed Silicon Coatings on SiC/SiC Composites
by Mengqiu Guo, Yongjing Cui, Changliang Wang, Jian Jiao, Xiaofang Bi and Chunhu Tao
Coatings 2023, 13(4), 674; https://0-doi-org.brum.beds.ac.uk/10.3390/coatings13040674 - 26 Mar 2023
Cited by 3 | Viewed by 1421
Abstract
In order to reveal the relationship between residual stress in Si layers of SiC/SiC composites and the different parameters used in their preparation, the residual stress of the coating surface was tested using X-ray sin2ψ technology and laser Raman spectroscopy. Then, [...] Read more.
In order to reveal the relationship between residual stress in Si layers of SiC/SiC composites and the different parameters used in their preparation, the residual stress of the coating surface was tested using X-ray sin2ψ technology and laser Raman spectroscopy. Then, the Raman shift–stress coefficient (P) and the Raman shift with free stress (ω0) were calculated as −201.41 MPa/cm−1 and 520.591 cm−1 via linear fitting with the least squares method. The results showed that all the as-sprayed Si coatings exhibited tensile stress on the surface, ranging from 53.5 to 65.9 MPa. The parameters of the spraying distance and second gas (H2) flow rate were considered to be the most important for controlling the residual stress on the coating surface. Additionally, the surface tensile stress of the Si layers could be eliminated and even changed into compressive stress by annealing above 800 °C. Furthermore, the residual stress distribution in the cross-section of the Si layers was evaluated using laser Raman spectroscopy. Additionally, the particle characteristics, such as in-flight velocity and temperature, were investigated using a diagnostic system. The results of this research contribute to increasing the understanding and control of residual stress in APS Si bond layers. Full article
(This article belongs to the Special Issue Thermal Spray Coatings)
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15 pages, 8483 KiB  
Article
Surface Characterization of Fracture in Polylactic Acid vs. PLA + Particle (Cu, Al, Graphene) Insertions by 3D Fused Deposition Modeling Technology
by Brândușa Ghiban, Nicoleta Elisabeta Pascu, Iulian Vasile Antoniac, Gabriel Jiga, Claudia Milea, Gabriela Petre, Cristina Gheorghe, Corneliu Munteanu and Bogdan Istrate
Coatings 2021, 11(6), 633; https://0-doi-org.brum.beds.ac.uk/10.3390/coatings11060633 - 25 May 2021
Cited by 5 | Viewed by 2217
Abstract
Polylactic acid (PLA) is one of the most extensively used biodegradable aliphatic polyester produced from renewable resources, such as corn starch. Due to its qualities, PLA is a leading biomaterial for numerous applications in medicine as well as in industry, replacing conventional petrochemical–based [...] Read more.
Polylactic acid (PLA) is one of the most extensively used biodegradable aliphatic polyester produced from renewable resources, such as corn starch. Due to its qualities, PLA is a leading biomaterial for numerous applications in medicine as well as in industry, replacing conventional petrochemical–based polymers. The purpose of this paper is to highlight the fracture behavior of pure PLA specimens in comparison with PLA particle insertions, (copper, aluminum and Graphene), after evaluation the mechanical properties, as well as the influence of filament angle deposition on these properties. In order to check if the filling density of the specimen influences the ultimate tensile stress (UTS), three different filling percentages (60%, 80%, and 100%) have been chosen in the experimental tests. A hierarchy concerning elongation / fiber heights after tensile testing was done. So, the highest elongation values were for simple PLA (about 4.1%), followed by PLA + Al insertion (3.2%–4%), PLA + graphene insertion (2.6%–4%) and the lowest values being for PLA with copper insertion (1.8%–2.7%). Regarding the fiber heights after fracture, the hierarchy was: the highest values was for PLA, then PLA + Al, PLA + grapheme and PLA + Cu. Finally, a correlation between fracture surfaces appearance and mechanical properties were established, being formulated the mechanism of fracture in according with filament angle deposition. Also, it was proposed a new method of evaluation of the fractured surface by measuring the dimensions of the filaments after printing Fused Deposition Modeling (FDM) and tensile testing. Full article
(This article belongs to the Special Issue Thermal Spray Coatings)
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