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Metals
Special Issues
Thermal Spraying of Metallic Coatings
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Thermal Spraying of Metallic Coatings

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: closed (30 September 2019) | Viewed by 14442

Special Issue Editor

Prof. Dr. Cecilia Bartuli

E-Mail Website
Guest Editor
Department of Chemical Engineering, Materials, Environment - University of Rome "La Sapienza", Via Eudossiana 18, 00185 Rome, RM, Italy
Interests: surface engineering; thermal spray deposition of protective and functional coatings; thermal barrier coatings; wear resistant cermet coatings; coatings for harsh environments; corrosion
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This is an invitation to contribute to a Special Issue of the open-access MDPI journal Metals, which is dedicated to "Thermal Spraying of Metallic Coatings".

Thermal spray is a large family of surface deposition techniques that are experiencing constant progress and evolution. Improving our fundamental comprehension of the physico-chemical phenomena at the basis of coatings build-up allows for the implementation of new processes designed to meet special requirements for either sensitive and complex-shaped substrates or challenging coating materials (such as nano-crystalline materials, amorphous metals, or metastable phases).

The subject proposed for the Special Issue covers fundamental and technological topics concerning consolidated and advanced spraying techniques for the deposition of metals and metal matrix composites (such as cold spraying, warm spraying, and high-velocity air-fuel); the optimization of conventional compositions and systems; and the design of innovative, metal-based coatings and architectures for newly conceived applications.

Topics of interest will include (but will not be limited to) the following:

  • Recent developments in thermal spraying technologies for metal-based coatings
  • The metallurgy of coatings and coating–substrate combinations
  • Wear, corrosion, and oxidation-resistant coatings
  • Innovative bond coats for thermal barrier coatings
  • Coatings for electronics
  • Coatings for biomedical applications
  • Post-treatments and joining
  • Standardization of testing procedures
  • Modelling and simulation of deposition processes and of coating performance in operation

I look forward to receiving your contribution to this common project, and I hope that the collection of papers will be able to offer a comprehensive and original overview of the most advanced research and technology efforts of the thermal spray community in the field of metallic coatings.

Prof. Cecilia Bartuli
Guest Editor

Keywords

  • Cold spray
  • Plasma spray
  • HVOF
  • HVAF
  • Warm spray
  • Weld
  • Arc
  • Laser
  • Wear
  • Cavitation
  • Corrosion
  • Oxidation
  • Functional coatings
  • Post-treatment

Published Papers (4 papers)

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Research

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12 pages, 5053 KiB  
Article
Formation of Metallic Glass Coatings by Detonation Spraying of a Fe66Cr10Nb5B19 Powder
by Ivanna D. Kuchumova, Igor S. Batraev, Vladimir Yu. Ulianitsky, Alexandr A. Shtertser, Konstantin B. Gerasimov, Arina V. Ukhina, Natalia V. Bulina, Ivan A. Bataev, Guilherme Yuuki Koga, Yaofeng Guo, Walter José Botta, Hidemi Kato, Takeshi Wada, Boris B. Bokhonov, Dina V. Dudina and Alberto Moreira Jorge, Jr.
Metals 2019, 9(8), 846; https://doi.org/10.3390/met9080846 - 31 Jul 2019
Cited by 16 | Viewed by 3119
Abstract
The present work was aimed to demonstrate the possibility of forming Fe66Cr10Nb5B19 metallic glass coatings by detonation spraying and analyze the coating formation process. A partially amorphous Fe66Cr10Nb5B19 powder [...] Read more.
The present work was aimed to demonstrate the possibility of forming Fe66Cr10Nb5B19 metallic glass coatings by detonation spraying and analyze the coating formation process. A partially amorphous Fe66Cr10Nb5B19 powder with particles ranging from 45 µm to 74 µm in diameter was used to deposit coatings on stainless steel substrates. The deposition process was studied for different explosive charges (fractions of the barrel volume filled with an explosive mixture (C2H2 + 1.1O2)). As the explosive charge was increased from 35% to 55%, the content of the crystalline phase in the coatings, as determined from the X-ray diffraction patterns, decreased. Coatings formed at explosive charges of 55–70% contained as little as 1 wt.% of the crystalline phase. In these coatings, nanocrystals in a metallic glass matrix were only rarely found; their presence was confined to some inter-splat boundaries. The particle velocities and temperatures at the exit of the barrel were calculated using a previously developed model. The particle temperatures increased as the explosive charge was increased from 35% to 70%; the particle velocities passed through maxima. The coatings acquire an amorphous structure as the molten particles rapidly solidify on the substrate; cooling rates of the splats were estimated. The Fe66Cr10Nb5B19 metallic glass coatings obtained at explosive changes of 55–60% showed low porosity (0.5–2.5%), high hardness (715–1025 HV), and high bonding strength to the substrate (150 MPa). Full article
(This article belongs to the Special Issue Thermal Spraying of Metallic Coatings)
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11 pages, 5559 KiB  
Article
Amorphous Steel Coatings Deposited by Cold-Gas Spraying
by Mario Tului, Cecilia Bartuli, Alessia Bezzon, Angelo Luigi Marino, Francesco Marra, Susanna Matera and Giovanni Pulci
Metals 2019, 9(6), 678; https://doi.org/10.3390/met9060678 - 12 Jun 2019
Cited by 10 | Viewed by 3512
Abstract
Cold-gas spray (CGS) deposition of amorphous steel coatings starting from a commercial feedstock powder containing boron, tungsten, and silicon was investigated. Microstructural characterization, carried out by X-ray diffraction (XRD), transmission electron microscopy, and backscattered electron diffraction (EBSD) analysis, confirmed the amorphous nature of [...] Read more.
Cold-gas spray (CGS) deposition of amorphous steel coatings starting from a commercial feedstock powder containing boron, tungsten, and silicon was investigated. Microstructural characterization, carried out by X-ray diffraction (XRD), transmission electron microscopy, and backscattered electron diffraction (EBSD) analysis, confirmed the amorphous nature of deposited coatings. The amorphization phenomenon is related to high-strain/strain-rate deformation with shear instability caused by very high particle kinetic energy, with a mechanism that resembles the severe plastic deformation process. The CGS coatings were heat-treated at temperatures ranging from 650 to 850 °C to induce partial recrystallization. The effect of nanocrystal nucleation and growth on the hardness of the coatings was investigated, and the hardness of heat-treated samples was found to increase with respect to as-sprayed coatings, outperforming conventional high-velocity oxy-fuel (HVOF) deposits. Hardness was found to decrease after prolonged (<90 min) or higher temperature (>750 °C) exposures. Full article
(This article belongs to the Special Issue Thermal Spraying of Metallic Coatings)
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9 pages, 3317 KiB  
Article
Phase Stability and Microstructure Evolution of Solution-Hardened 316L Powder Feedstock for Thermal Spraying
by Thomas Lindner, Martin Löbel and Thomas Lampke
Metals 2018, 8(12), 1063; https://doi.org/10.3390/met8121063 - 14 Dec 2018
Cited by 8 | Viewed by 2910
Abstract
A solution-hardening of AISI 316L stainless-steel powder was conducted. The expansion of the crystal lattice and a strong increase in the nanoindentation hardness confirm the successful diffusion of carbon and nitrogen in the interstices. A multiphase state of the powder feedstock with phase [...] Read more.
A solution-hardening of AISI 316L stainless-steel powder was conducted. The expansion of the crystal lattice and a strong increase in the nanoindentation hardness confirm the successful diffusion of carbon and nitrogen in the interstices. A multiphase state of the powder feedstock with phase fractions of the metastable S-phase (expanded austenite) mainly at the particle’s edge, and the initial austenitic phase within the core was found. Thermal spraying using high velocity oxy-fuel (HVOF) and atmospheric plasma spraying (APS) prove the sufficient thermal stability of the Sphase. Microstructural investigations of the HVOF coating reveal the ductility of the S-phase layer, while the higher heat load within the APS cause diffusion processes with the initial austenitic phase. The lattice expansion and the nanoindentation hardness decrease during thermal spraying. However, the absence of precipitates ensures the sufficient heat stability of the metastable S-phase. Even though further efforts are required for the thermochemical treatment of powder feedstock, the results confirm the feasibility of the novel powder treatment approach. Full article
(This article belongs to the Special Issue Thermal Spraying of Metallic Coatings)
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Review

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22 pages, 7883 KiB  
Review
Computer-Controlled Detonation Spraying: Flexible Control of the Coating Chemistry and Microstructure
by Vladimir Yu. Ulianitsky, Dina V. Dudina, Alexandr A. Shtertser and Igor Smurov
Metals 2019, 9(12), 1244; https://doi.org/10.3390/met9121244 - 20 Nov 2019
Cited by 35 | Viewed by 3892
Abstract
This article is a focused review aimed to describe the potential of the computer-controlled detonation spraying (CCDS) for producing and designing coatings with variable chemical and phase compositions and microstructure and promising properties. The development of the detonation spraying method is briefly analyzed [...] Read more.
This article is a focused review aimed to describe the potential of the computer-controlled detonation spraying (CCDS) for producing and designing coatings with variable chemical and phase compositions and microstructure and promising properties. The development of the detonation spraying method is briefly analyzed from a historical perspective and the capabilities of the state-of-the art facilities are presented. A key advantage of the CCDS is the possibility of using precisely measured quantities of the explosive gaseous mixtures for each shot of the detonation gun and different oxygen to fuel ratios, which can create spraying environments of different chemical properties—from severely oxidizing to highly reducing. The significance of careful adjustment of the spraying parameters is shown using material systems that are chemically sensitive to the composition of the spraying environment and temperature. Research performed by the authors on CCDS of different materials—metals, ceramics, intermetallics and metal-ceramic composites is reviewed. Novel applications of detonation spraying using the CCDS technology are described. Full article
(This article belongs to the Special Issue Thermal Spraying of Metallic Coatings)
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