Nozzle Developments for Thermal Spray at Very Low Pressure

Bolot, Rodolphe; Sokolov, D. F.; Klein, D.; Coddet, Christian

doi:10.1361/105996306x146992

Cited by 10 publications

(3 citation statements)

References 4 publications

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“…This was attributed to laminar flow of the plasma caused by limited interaction with the diffuse chamber atmosphere. In this environment, the mean free path of atoms in the plasma increases, leading to the likelihood that radiation increases in significance for heat transfer as the collision rate drops [6][7][8][9][10][11][12].…”

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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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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“…They also noted that the collision rate at these chamber pressures is strongly reduced and, therefore, the assumption of local thermodynamic equilibrium may no longer be valid. Although the behavior of high energy density plasma at the pressures associated with VLPPS is not well understood, it has been reported that heat transfer is no longer collision dominated in these lower pressure regimes [2,[29][30][31][32][33]. Complex interactions exist between the feedstock material and the VLPPS plasma, most of which can currently only be inferred based on plasma spray research at higher pressures [34][35][36][37].…”

Section: Plasma Jet Properties At Very Low Chamber Pressuresmentioning

confidence: 99%

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

et al. 2011

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Abstract:A fundamentally new family of thermal spray processes has emerged. These new processes, collectively known as very low pressure plasma spray or VLPPS, differ from traditional thermal spray processes in that coatings are deposited at unusually low chamber pressures, typically less than ~800 Pa (6 Torr). Depending upon the specific process, deposition may be in the form of very fine molten droplets, vapor phase deposition, or a mixture of vapor and droplet deposition. Resulting coatings are similar in quality to coatings produced by alternative coating technologies, such as physical vapor deposition (PVD) or chemical vapor deposition (CVD), but deposition rates can be roughly an order of magnitude higher with VLPPS. With these new process technologies modified low pressure plasma spray (LPPS) systems can now be used to produce dense, high quality coatings in the 1 to 100 micron thickness range with lamellar or columnar microstructures. A history of pioneering work in VLPPS technology is presented, deposition mechanisms are discussed, potential new applications are reviewed, and challenges for the future are outlined. OPEN ACCESSCoatings 2011, 1 118

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“…Besides coating manufacturing, other works [18][19][20][21][22][23] aimed at characterizing the plasma jet structure, its thermodynamic properties and transport coefficients and its interactions with a substrate. The low pressure in the chamber (from 100 to 1000 Pa) greatly affects both the plasma jet morphology and the thermal and kinetic histories of the feedstock particles.…”

Section: Introductionmentioning

confidence: 99%

Study of metallic powder behavior in very low pressure plasma spraying (VLPPS) — Application to the manufacturing of titanium–aluminum coatings

Vautherin¹,

Planche²,

Montavon³

et al. 2015

Surface and Coatings Technology

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Nozzle Developments for Thermal Spray at Very Low Pressure

Cited by 10 publications

References 4 publications

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

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

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

Study of metallic powder behavior in very low pressure plasma spraying (VLPPS) — Application to the manufacturing of titanium–aluminum coatings

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