Numerical Study of the Plasma Flow Field and Particle In-flight Behavior with the Obstruction of a Curved Substrate

Ba, Te; Kang, Chang Wei; Ng, Heong Wah

doi:10.1007/s11666-009-9395-1

Cited by 15 publications

(11 citation statements)

References 21 publications

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“…Therefore, with this curved target the stagnation zone is also weakened in size and submicron particles are less decelerated by this change of plasma flow behaviour. This trend on velocity results in front of a curved substrate is in agreement with simulations [13,19].…”

Section: Effect Of the Shape Of The Substrate On The Axial Evolution Of Particle Velocitysupporting

confidence: 90%

“…Thus the presence of an obstacle totally disrupts the plasma and particle flow streams and affects their respective average velocity [19]. If submicron particles precisely follow plasma flow streamlines, as shown in simulations, how then is a SPS coating built when the centerline of the particle flow bearing a maximum of particles concentration rapidly decelerates and is easily deviated by the stagnation area?…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study of the Impact of Substrate Shape and Tilting on Particle Velocity in Suspension Plasma Spraying

et al. 2020

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Suspension plasma spraying has shown its capacity to deposit finely structured coatings with a wide range of microstructures including columnar microstructures that are generally sought in thermal barrier coating applications for gas turbines. However, some challenges are still to be taken up before the application of the technology at an industrial scale. One deals with the deposition of a uniform and reliable coating on a complex shape substrate. This work offers an experimental observation of submicron particle streams close to the substrate in order to understand mechanisms of deposition. Effects of the substrate shape and tilting were investigated on particle velocity, directions and coating growth. It was shown that particle velocities and directions are disrupted by the substrate presence up to 10mm upstream. When the substrate is a cylinder or in a tilted orientation to the plasma jet, particles kinetic behaviour is less affected. Finally, submicron particle velocity vectors orientation near impact greatly shape the coating morphology. When impacting with a 40° angle of incidence, columns appeared on beads, contrary to submicron particle streams impacting orthogonally to the substrate surface.

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Section: Effect Of the Shape Of The Substrate On The Axial Evolution Of Particle Velocitysupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Impact of Substrate Shape and Tilting on Particle Velocity in Suspension Plasma Spraying

et al. 2020

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“…On the concave region, the rebounding of small particles combined with the reverse flow of the plasma streamlines could lead to the respraying of the rebounded particles. This respraying might contribute to higher coating thickness [40]. The pore network in the APS coating allows the infiltration of the combustion gases during the high pressure of the compression stroke.…”

Section: Thicknessmentioning

confidence: 99%

Section: Porositymentioning

confidence: 99%

Microstructural Changes in Suspension Plasma-Sprayed TBCs Deposited on Complex Geometry Substrates

2020

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Thermal barrier coatings (TBCs) are considered a promising solution for improving the efficiency of internal combustion engines. Among the thermal spray processes, the relatively newly developed suspension plasma spray (SPS) is an attractive candidate due to its unique microstructural features that have already demonstrated increased performance in gas turbine applications. To achieve these features, thermal spray conditions play an essential role. In specific uses, such as piston of diesel engines, parameters as spray angle and spray distance pose challenges to keep them constant during the whole spray process due to the complex geometry of the piston. To understand the effect of the spray distance and spray angle, a comprehensive investigation of the produced thermal spray microstructure on the piston geometry was conducted. Flat and complex geometry surfaces were coated using the same plasma parameters while the spray angle and distance were changed. Characterization was performed using scanning electron microscopy (SEM) combined with the image analysis technique to perceive the variation of the thickness and microstructures features such as pores, cracks, column density, and column orientation. The results showed that the changes in spray angles and spray distances due to the complex shape of the substrate have a significant influence on the microstructure and thermal properties (thermal conductivity and thermal effusivity) of the coatings. The thermal conductivity and thermal effusivity were calculated by modeling for the different regions of the piston and measured by laser flash analysis combined with modeling for the flat-surfaced coupon. It was shown that the modeling approach is an effective tool to predict the thermal properties and thus to understand the influence of the parameters on the coating properties. Connecting the observations of the work on the microstructural and thermal properties, the complex geometry’s influence on the produced coatings could be diminished by tailoring the process and generating the most desirable TBC for the internal combustion engines in future applications.

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“…From the beginning of 2000 the new researches in plasma computational modelling based on modern computational technologies, mathematical methods and big data management approaches were streamlined with an aim to make a plasma spray model qualified for engineering technological computations [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Conception of CAE system support for protective coating deposition process design in agroindustrial complex

Кравченко

Glinskiy

Kuznetsov

et al. 2019

Engineering for Rural Development

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Currently in agricultural complex there exists a significant requirement in life time improving of the different processing equipment. One of the most promising and advanced ways to improve the resource of technological equipment is the protective and functional coatings thermal spray deposition for reconditioning and hardening of the core parts and movable operating elements, such as: parts of mixers of variable constructions and purposes, blades and scrapers of different machines, calenders, sliding bearing and mechanical seal parts, tank equipment and heat exchanger work surfaces, high speed centrifugal separator and decanter parts, conveyors and draw plates. Using of the proposed intelligent automated design system (CAE-system) enables considerably decrease costs and time for development of effective resource-saving technological processes of manufacturing coated equipment parts, improve quality and increase designers and technologist labour productivity. The software package being implemented at the same time allows to effectively carry out computational experiments for a comprehensive study and prediction of the resulting coatings of various functional purposes with enhanced physical, mechanical and operational properties. The paper presents the concept, architecture, principles of design and approach to development of the proposed CAE-system and highlights the potential for its further implementation in the practice of processing industries repair facilities and specialized service centres of the agroindustrial complex.

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Numerical Study of the Plasma Flow Field and Particle In-flight Behavior with the Obstruction of a Curved Substrate

Cited by 15 publications

References 21 publications

Experimental Study of the Impact of Substrate Shape and Tilting on Particle Velocity in Suspension Plasma Spraying

Experimental Study of the Impact of Substrate Shape and Tilting on Particle Velocity in Suspension Plasma Spraying

Microstructural Changes in Suspension Plasma-Sprayed TBCs Deposited on Complex Geometry Substrates

Conception of CAE system support for protective coating deposition process design in agroindustrial complex

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