Journal of Thermal Spray Technology

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ISSN / EISSN : 1059-9630 / 1544-1016
Published by: Springer Nature (10.1007)
Total articles ≅ 3,256
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, M. Sayed, E. M. Mahmoud, A. Killinger, R. Gadow, S. M. Naga
Journal of Thermal Spray Technology pp 1-14; https://doi.org/10.1007/s11666-021-01265-0

Abstract:
This investigation aims to study a novel biologically derived coating applied on Ti alloy substrates. Obtained from a low-cost fish bone resource, a nanocrystalline hydroxyapatite has been synthesized and converted to an organic suspension. Coating was then manufactured by a high-velocity suspension flame spray process. The microstructure, phase composition, coating thickness, and roughness of hydroxyapatite (HA)-coated samples were studied. The results indicated the presence of both hydroxyapatite and β-tricalcium phosphate phases and the final coating layer was uniform and dense. In vitro bioactivity and biodegradability of the HA/Ti composite samples were estimated by immersion in simulated body fluid. Remarkable reductions in Ca2+ and PO4 3− ion concentrations were observed as well as low weight loss percentage and a slight variation in the pH value, indicating the generation of an apatite layer on the surface of all studied samples. Scanning electron microscopy, energy-dispersive x-ray analysis, and inductively coupled plasma–optical emission spectrometry confirm these results. Thus biological derived HA coatings are a promising candidate to enhance bioactivity and biodegradability of bone implants. To demonstrate feasibility on commercial medical components, a medical screw was coated and evaluated.
Tuan Van Nguyen, Ha Thi Pham, Ly Thi Pham, Phuong Thi Nguyen, Thuy Bich Dao, Trung Van Trinh, Duong Vu,
Journal of Thermal Spray Technology pp 1-13; https://doi.org/10.1007/s11666-021-01263-2

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Maryam Yaghtin, Amirhossein Yaghtin, Pooria Najafisayar, Zhaolin Tang, Tom Troczynski
Journal of Thermal Spray Technology pp 1-11; https://doi.org/10.1007/s11666-021-01258-z

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Shuai Zhang, Sina Alavi, Arash Kashani, Yushan Ma, Yinxiao Zhan, Wanxiang Dai, Wenju Li,
Published: 30 September 2021
Journal of Thermal Spray Technology pp 1-27; https://doi.org/10.1007/s11666-021-01256-1

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Carlos A. Poblano-Salas, Oscar Sotelo-Mazón, , Jorge Corona-Castuera, Gabriela Martinez, Maura Casales-Diaz, Jesus Porcayo-Calderón, Kar Tathagata, Maria Navarro, Mohan Kumar Kesarla
Published: 24 September 2021
Journal of Thermal Spray Technology pp 1-17; https://doi.org/10.1007/s11666-021-01257-0

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, Christophe Chazelas, Vincent Rat, Armelle Vardelle, Ron Molz
Journal of Thermal Spray Technology pp 1-18; https://doi.org/10.1007/s11666-021-01253-4

Abstract:
In DC plasma spray torches, anode erosion is a common concern. It mainly depends on the heat flux brought by the arc and on the dimensions and residence time of the arc attachment to a given location on the anode wall. The latter depend, to a great extent, on the attachment mode of the arc on the anode wall. This paper compares the anode arc attachment modes predicted by an LTE (Local Thermodynamic Equilibrium) and 2-T (two-temperature) arc models that include the electrodes in the computational domain. It deals with a commercial cascaded-anode plasma torch operated at high current (500 A) and low gas flow rate (60 NLPM of argon). It shows that the LTE model predicted a constricted anode arc attachment that moves on the anode ring, while the 2-T model predicted a diffuse and steady arc attachment. The comparison between the predicted and measured arc voltage showed that the 2-T prediction is closer to the actual voltage. Also, the post-mortem observation of a new anode ring of the actual plasma torch operated under the same conditions for a short time confirmed a diffuse arc attachment on a new anode.
, Thomas Lindner, Thomas Mehner, Lisa-Marie Rymer, Stefan Björklund, Shrikant Joshi, Thomas Lampke
Journal of Thermal Spray Technology pp 1-9; https://doi.org/10.1007/s11666-021-01255-2

Abstract:
High-entropy alloys (HEAs) represent an innovative development approach for new alloy systems. These materials have been found to yield promising properties, such as high strength in combination with sufficient ductility as well as high wear and corrosion resistance. Especially for alloys with a body-centered cubic (bcc) structure, advantageous surface properties have been revealed. However, typical HEA systems contain high contents of expensive or scarce elements. Consequently, applying them as coatings where their use is limited to the surface represents an exciting pathway enabling economical exploitation of their superior properties. Nevertheless, processing conditions strongly influence the resulting microstructure and phase formation, which in turn has a considerable effect on the functional properties of HEAs. In the presented study, microstructural differences between high-velocity oxygen fuel (HVOF) and high-velocity air fuel (HVAF) sprayed coatings of the alloy AlCrFeCoNi are investigated. A metastable bcc structure is formed in both coating processes. Precipitation reactions are suppressed by the rapid solidification during atomization and by the relatively low thermal input during spraying. The coating resistance to corrosive media was investigated in detail, and an improved passivation behavior was observed in the HVAF coatings.
Wei Tang, , Yan Li, Bo Yu, Jiabin Zhao
Journal of Thermal Spray Technology pp 1-18; https://doi.org/10.1007/s11666-021-01254-3

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, , Sridhar Narayanaswamy, Pak Keng Koh, Vladimir Luzin, T. Gnaupel-Herold,
Journal of Thermal Spray Technology pp 1-17; https://doi.org/10.1007/s11666-021-01252-5

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