Very Low Pressure Plasma Spray—A Review of an Emerging Technology in the Thermal Spray Community

Smith, Mark F.; Hall, Aaron Christopher.; Fleetwood, James D.; Meyer, P.

doi:10.3390/coatings1020117

Cited by 69 publications

(20 citation statements)

References 32 publications

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“…The elevated temperature at the jet core (~14,000 K) produces high proportions of particles melted and it gives rise to excellent deposition characteristics like coating density, bond strength, and less porosity compared to other thermal spraying techniques [84]. Vacuum plasma spray (VPS) coatings (<100 Pa) are developed to reduce the detrimental effects like oxidation and undesired contamination in the coatings [85]. Vacuum spray coatings offer better columnar structure and increased deposition rate compared to the conventional PVD.…”

Section: Thermal Spray Techniquesmentioning

confidence: 99%

Coating Technologies for Copper Based Antimicrobial Active Surfaces: A Perspective Review

Bharadishettar

Kuruveri

Panemangalore

2021

Metals

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Microbial contamination of medical devices and treatment rooms leads to several detrimental hospital and device-associated infections. Antimicrobial copper coatings are a new approach to control healthcare-associated infections (HAI’s). This review paper focuses on the efficient methods for depositing highly adherent copper-based antimicrobial coatings onto a variety of metal surfaces. Antimicrobial properties of the copper coatings produced by various deposition methods including thermal spray technique, electrodeposition, electroless plating, chemical vapor deposition (CVD), physical vapor deposition (PVD), and sputtering techniques are compared. The coating produced using different processes did not produce similar properties. Also, process parameters often could be varied for any given coating process to impart a change in structure, topography, wettability, hardness, surface roughness, and adhesion strength. In turn, all of them affect antimicrobial activity. Fundamental concepts of the coating process are described in detail by highlighting the influence of process parameters to increase antimicrobial activity. The strategies for developing antimicrobial surfaces could help in understanding the mechanism of killing the microbes.

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Section: Thermal Spray Techniquesmentioning

confidence: 99%

Coating Technologies for Copper Based Antimicrobial Active Surfaces: A Perspective Review

Bharadishettar

Kuruveri

Panemangalore

2021

Metals

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“…This requirement has led to the development of innovative plasma coating processes for producing coatings with grain size in the nanometer range while keeping the high deposition rate and flexibility of plasma spraying [27,28]. The process uses the basic equipment of the conventional plasma spray process but the feedstock is a liquid suspension or a solution of chemical precursors instead of the conventional powder feedstock, which takes advantage of the high enthalpy content of the plasma jet to evaporate the spray material and then forms a coating by fine droplets and/or condensation of the vaporized material on the substrate [29,30]. To form the coating with liquid precursors, these must be injected into the plasma region in smaller droplets (sprayed or atomized).…”

Section: Atmospheric Plasma Spray Micro-to-nano-sized Structuresmentioning

confidence: 99%

Atmospheric Plasma Spray Processes: From Micro to Nanostructures

Miranda¹,

Caliari²,

Essiptchouk³

et al. 2019

Atmospheric Pressure Plasma - From Diagnostics to Applications

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Atmospheric plasma spray is probably the most versatile of all thermal spraying processes, because there are few limitations either on the materials that can be sprayed or the substrate, in relation to its material, size, and shape. The material precursor of the coating could be in the form of powders, wires, melted materials, solutions, or suspensions. What distinguishes the plasma spray process from other technologies is its applicability and capacity to process a wide variety of materials, including metallic and refractory materials at atmospheric pressure. The coatings properties are improved by deposition of coatings with finer microstructure, which is are more suitable for mechanical and thermal stresses than the lamellar microstructure of conventional plasma-sprayed coatings.

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“…With very low pressure plasma spray, the plasma is formed in a chamber held at pressures around 100 to 600 Pa (0.75 to 4.50 Torr) [5]. Over this pressure range, the plasma jet expands to more than 20 cm in diameter and 1 m in length.…”

Section: Very Low Pressure Plasma Spray (Vlpps)mentioning

confidence: 99%

Doped solid oxide fuel cell electrolytes produced via combination of suspension plasma spray and very low pressure plasma spray.

Fleetwood

Slamovich

Trice

et al. 2012

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Solid oxide fuel cells (SOFCs) are a promising element of comprehensive energy portfolio due to their direct mechanism for converting the oxidization of fuel, such as hydrogen, into electrical energy. Plasma spray allows deposition of high melting temperature SOFC feedstock on complex surfaces, such as in non-planar SOFC designs. Dense, thin electrolytes of ideal composition for SOFCs can be created by suspension plasma spraying in a very low pressure environment. Compositional control is achieved with dissolved dopant compounds that are incorporated into the coating during spraying. In the work reported, sub-micron 8 mole% Y 2 O 3 -ZrO 2 (YSZ) powders, in suspension with scandium-nitrate dopants, were sprayed on NiO-YSZ anodes, at Sandia National Laboratories' Thermal Spray Research Laboratory. The spray chamber was held at 2.4-10 Torr, with the plasma composed of argon, hydrogen, and helium. The resultant electrolytes were 2-10 microns thick. Electrolyte microstructure and performance as part of a SOFC system is reported.

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Very Low Pressure Plasma Spray—A Review of an Emerging Technology in the Thermal Spray Community

Cited by 69 publications

References 32 publications

Coating Technologies for Copper Based Antimicrobial Active Surfaces: A Perspective Review

Coating Technologies for Copper Based Antimicrobial Active Surfaces: A Perspective Review

Atmospheric Plasma Spray Processes: From Micro to Nanostructures

Doped solid oxide fuel cell electrolytes produced via combination of suspension plasma spray and very low pressure plasma spray.

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