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New Advances in Thermal Spraying
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New Advances in Thermal Spraying

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Surface Characterization, Deposition and Modification".

Deadline for manuscript submissions: closed (31 August 2021) | Viewed by 14209

Special Issue Editor

Prof. Dr. Hua Li

E-Mail Website
Guest Editor
Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
Interests: thermal spray; surfaces and interfaces; antibacterial & antifouling technology

Special Issue Information

Dear Colleagues,

The Special Issue "New Advances in Thermal Spraying" is open for submissions. We would like to invite you to submit your excellent work to this issue.

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

  • Most recent progress in thermal spray feedstock materials in the form of wire, powder, liquid precursor, or suspension. Research on novel nanosized/nanostructured materials and new composite materials for thermal spray deposition is particularly encouraged to submit for consideration of publication
  • New applications of thermal sprayed coatings, in particular biocidal applications, energy applications, biomedical applications, and environmental applications. Multidisciplinary research relating to the functional applications of thermal sprayed coatings is regarded as one of the core values of the Special Issue
  • New findings in processing-microstructure-property relationships of thermal sprayed coatings. New fundamental understanding of thermal sprayed coatings and thermal spray processing is of special interests for this Special Issue.

Prof. Dr. Hua Li
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

  • Thermal spray
  • Functional coatings
  • New coating materials
  • Composite coatings
  • Nanostructured coatings
  • Processing-microstructure-property relationships

Published Papers (6 papers)

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Research

10 pages, 49511 KiB  
Article
Comparative Study of Structures and Properties of Detonation Coatings with α-Al2O3 and γ-Al2O3 Main Phases
by Bauyrzhan Rakhadilov, Dauir Kakimzhanov, Daryn Baizhan, Gulnar Muslimanova, Sapargali Pazylbek and Laila Zhurerova
Coatings 2021, 11(12), 1566; https://0-doi-org.brum.beds.ac.uk/10.3390/coatings11121566 - 20 Dec 2021
Cited by 7 | Viewed by 2378
Abstract
This study is aimed at obtaining a coating of aluminum oxide containing α-Al2O3 as the main phase by detonation spraying, as well as a comparative study of the structural, tribological and mechanical properties of coatings with the main phases of [...] Read more.
This study is aimed at obtaining a coating of aluminum oxide containing α-Al2O3 as the main phase by detonation spraying, as well as a comparative study of the structural, tribological and mechanical properties of coatings with the main phases of α-Al2O3 and γ-Al2O3. It was experimentally revealed for the first time that the use of propane as a combustible gas and the optimization of the technological regime of detonation spraying leads to the formation of an aluminum oxide coating containing α-Al2O3 as the main phase. Tribological tests have shown that the coating with the main phase of α-Al2O3 has a low value of wear volume and coefficient of friction in comparison with the coating with the main phase of γ-Al2O3. It was also determined that the microhardness of the coating with the main phase of α-Al2O3 is 25% higher than that of the coatings with the main phase of γ-Al2O3. Erosion resistance tests have shown (evaluated by weight loss) that the coating with α-Al2O3 phase is erosion-resistant compared to the coating with γ-Al2O3 (seen by erosion craters). However, the coating with the main phase of γ-Al2O3 has a high value of adhesion strength, which is 2 times higher than that of the coating with the main phase of α-Al2O3. As the destruction of coatings by the primary phase, α-Al2O3 began at low loads than the coating with the main phase γ-Al2O3. The results obtained provide the prerequisites for the creation of wear-resistant, hard and durable layered coatings, in which the lower layer has the main phase of γ-Al2O3, and the upper layer has the main phase of α-Al2O3. Full article
(This article belongs to the Special Issue New Advances in Thermal Spraying)
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14 pages, 4804 KiB  
Article
Creation of Bioceramic Coatings on the Surface of Ti–6Al–4V Alloy by Plasma Electrolytic Oxidation Followed by Gas Detonation Spraying
by Bauyrzhan Rakhadilov and Daryn Baizhan
Coatings 2021, 11(12), 1433; https://0-doi-org.brum.beds.ac.uk/10.3390/coatings11121433 - 23 Nov 2021
Cited by 12 | Viewed by 1847
Abstract
In this work, bioceramic coatings were formed on Ti6Al4V titanium alloy using a combined technique of plasma electrolytic oxidation followed by gas detonation spraying of calcium phosphate ceramics, based on hydroxyapatite. Plasma electrolytic oxidation was carried out in electrolytes with various chemical compositions, [...] Read more.
In this work, bioceramic coatings were formed on Ti6Al4V titanium alloy using a combined technique of plasma electrolytic oxidation followed by gas detonation spraying of calcium phosphate ceramics, based on hydroxyapatite. Plasma electrolytic oxidation was carried out in electrolytes with various chemical compositions, and the effect of electrolytes on the macro and microstructure, pore size and phase composition of coatings was estimated. Three types of electrolytes based on sodium compounds were used: phosphate, hydroxide, and silicate. Plasma electrolytic oxidation of the Ti–6Al–4V titanium alloy was carried out at a fixed DC voltage (270 V) for 5 min. The sample morphology and phase composition were studied with a scanning electron microscope and an X-ray diffractometer. According to the results, the most homogeneous structure with lower porousness and many crystalline anatase phases was obtained in the coating prepared in the silicate-based electrolyte. A hydroxyapatite layer was obtained on the surface of the oxide layer using detonation spraying. It was determined that the appearance of α-tricalcium phosphate phases is characteristic for detonation spraying of hydroxyapatite, but the hydroxyapatite phase is retained in the coating composition. Raman spectroscopy results indicate that hydroxyapatite is the main phase in the coatings. Full article
(This article belongs to the Special Issue New Advances in Thermal Spraying)
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22 pages, 17796 KiB  
Article
Impact Evaluation of High Energy Ball Milling Homogenization Process in the Phase Distribution of Hydroxyapatite-Barium Titanate Plasma Spray Biocoating
by Roberto Gómez Batres, Zelma S. Guzmán Escobedo, Karime Carrera Gutiérrez, Irene Leal Berumen, Abel Hurtado Macias, Guillermo Herrera Pérez and Víctor M. Orozco Carmona
Coatings 2021, 11(6), 728; https://0-doi-org.brum.beds.ac.uk/10.3390/coatings11060728 - 17 Jun 2021
Cited by 2 | Viewed by 2382
Abstract
Air plasma spray technique (APS) is widely used in the biomedical industry for the development of HA-based biocoatings. The present study focuses on the influence of powder homogenization treatment by high-energy ball milling (HEBM) in developing a novel hydroxyapatite-barium titanate (HA/BT) composite coating [...] Read more.
Air plasma spray technique (APS) is widely used in the biomedical industry for the development of HA-based biocoatings. The present study focuses on the influence of powder homogenization treatment by high-energy ball milling (HEBM) in developing a novel hydroxyapatite-barium titanate (HA/BT) composite coating deposited by APS; in order to compare the impact of the milling process, powders were homogenized by mechanical stirring homogenization (MSH) too. For the two-homogenization process, three weight percent ratios were studied; 10%, 30%, and 50% w/w of BT in the HA matrix. The phase and crystallite size were analyzed by X-ray diffraction patterns (XRD); the BT-phase distribution in the coating was analyzed by backscattered electron image (BSE) with a scanning electron microscope (SEM); the energy-dispersive X-ray spectroscopy (EDS) analysis was used to determinate the Ca/P molar ratio of the coatings, the degree of adhesion (bonding strength) of coatings was determinate by pull-out test according to ASTM C633, and finally the nanomechanical properties was determinate by nanoindentation. In the results, the HEBM powder processing shows better efficiency in phase distribution, being the 30% (w/w) of BT in HA matrix that promotes the best bonding strength performance and failure type conduct (cohesive-type), on the other hand HEBM powder treatment promotes a slightly greater crystal phase stability and crystal shrank conduct against MSH; the HEBM promotes a better behavior in the nanomechanical properties of (i) adhesive strength, (ii) cohesive/adhesive failure-type, (iii) stiffness, (iv) elastic modulus, and (v) hardness properties. Full article
(This article belongs to the Special Issue New Advances in Thermal Spraying)
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13 pages, 13254 KiB  
Article
Microstructural Charactistics of Plasma Sprayed NiCrBSi Coatings and Their Wear and Corrosion Behaviors
by Songqiang Huang, Jingzhong Zhou, Kuoteng Sun, Hailiang Yang, Weichen Cai, Yi Liu, Ping Zhou, Shuangjie Wu and Hua Li
Coatings 2021, 11(2), 170; https://0-doi-org.brum.beds.ac.uk/10.3390/coatings11020170 - 31 Jan 2021
Cited by 13 | Viewed by 3204
Abstract
Nickel-based alloys are commonly used as protective coating materials for surface protection applications owing to their superior resistance to corrosion, wear and high-temperature oxidation. It is urgent to study the fundamental mechanism between the structure and corrosion properties of the Nickel-base composite coatings. [...] Read more.
Nickel-based alloys are commonly used as protective coating materials for surface protection applications owing to their superior resistance to corrosion, wear and high-temperature oxidation. It is urgent to study the fundamental mechanism between the structure and corrosion properties of the Nickel-base composite coatings. This paper, therefore, focuses on clarifying the mechanisms of the microstructure influencing the acid corrosion and mechanical characteristics of the as-sprayed NiCrBSi coating and post-heat-treated coating. The formation mechanisms of the amorphous phase of flat particles during the plasma spray process were studied by using X-ray diffraction analysis, Raman spectroscopy and confocal laser scanning microscope at first. Then the evolutionary process of the corrosion structure and phase of the coating in the accelerated corrosion experiment is directly visualized by using scanning electron microscopy and energy spectrum analysis. The mechanical properties of the amorphous NiCrBSi coatings are lastly measured by microhardness and friction wear tests. The critical phenomena and results help to elucidate the relative influence of the surface features of atmospheric plasma sprayed coatings on acid corrosion responses and wear resistance, aiming at contributing to the development of a protective technique for electrical engineering. Full article
(This article belongs to the Special Issue New Advances in Thermal Spraying)
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15 pages, 5796 KiB  
Article
Fabrication and Property Evaluation of the Al2O3-TiO2 Composite Coatings Prepared by Plasma Spray
by Jingzhong Zhou, Kuoteng Sun, Songqiang Huang, Weichen Cai, Yangzhi Wei, Liang Meng, Zhaowei Hu and Wenge Li
Coatings 2020, 10(11), 1122; https://0-doi-org.brum.beds.ac.uk/10.3390/coatings10111122 - 20 Nov 2020
Cited by 7 | Viewed by 1951
Abstract
The Al2O3-13 wt.% TiO2 (AT13) composite coatings were prepared on Q235 steel by plasma spray technique. The spray parameters were designed by the orthogonal experiments, and the properties of the coating were evaluated. Results showed that with respect [...] Read more.
The Al2O3-13 wt.% TiO2 (AT13) composite coatings were prepared on Q235 steel by plasma spray technique. The spray parameters were designed by the orthogonal experiments, and the properties of the coating were evaluated. Results showed that with respect to the bond strength of the coating, the optimized spraying parameters were the plasma current of 530 A, Ar flow of 41 L/min, H2 flow of 10 L/min, and spray standoff distance of 100 mm. The plasma spray process led to the transition of α-Al2O3 to γ-Al2O3, resulting in the increase in the porosity of AT13 coating prepared at nonoptimized parameters. Meanwhile, the porosity and cracks were also increased due to the decrease in the Ar flow and the increase in spray standoff distance. The low porosity, a few cracks, and the uniformly dispersed TiO2 particles contributed the enhanced properties including mechanical and corrosion behaviors of the AT13 coating prepared at optimized parameters. The bond strength, microhardness, and thermal shock resistance of the AT13 coating could reach 25.01 MPa, 1000.6 HV0.5, and 40 times when the coating was prepared at optimized parameters, respectively. Especially, the static Icorr of the AT13 coating prepared at optimized parameters was two order of magnitude less than that of Q235 steel. In addition, the erosion weight loss of Q235 steel could be decreased about 30 times by the protection of the AT13 coating. Full article
(This article belongs to the Special Issue New Advances in Thermal Spraying)
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9 pages, 3576 KiB  
Article
Evaluation on the Corrosion and Wear Properties of C-Fibers Doped Aluminum Coatings Obtained Using Arc Spray Technolgoy
by Su Fang, Jingzhong Zhou, Songqiang Huang, Zhaowei Hu and Wenge Li
Coatings 2020, 10(11), 1096; https://0-doi-org.brum.beds.ac.uk/10.3390/coatings10111096 - 16 Nov 2020
Cited by 4 | Viewed by 1563
Abstract
Aiming at the wear and corrosion problems of fittings in 500-kV power transmission lines, a functional aluminum-based coating is prepared by an electric arc spraying process and self-made aluminum-based powder-cored wire. The experimental results showed that the friction coefficient of the coating is [...] Read more.
Aiming at the wear and corrosion problems of fittings in 500-kV power transmission lines, a functional aluminum-based coating is prepared by an electric arc spraying process and self-made aluminum-based powder-cored wire. The experimental results showed that the friction coefficient of the coating is reduced from 0.4 to 0.2 after adding carbon fiber and that the wear rate is reduced from 2 × 10−3 to 8 × 10−4 mm3/(N·m). The electrochemical behavior of the composite coating is similar to that of the pure aluminum coating. After a 720-h salt spray test, there is no obvious corrosion products on the coating surface, and the thickness of the corrosion layer is only 29 μm. The new composite coating not only has a good anti-wear effect, but also maintains good corrosion resistance of the aluminum coating. Full article
(This article belongs to the Special Issue New Advances in Thermal Spraying)
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