Optimization of the injection with a twin-fluid atomizer for suspension plasma spray process using three non-intrusive diagnostic tools

Aubignat, E.; Planche, Marie-Pierre; Billières, Dominique; Allimant, Alain; Girardot, Laurent; Bailly, Yannick; Montavon, Ghislain

doi:10.1007/s12650-015-0281-2

Cited by 10 publications

(4 citation statements)

References 23 publications

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“…Finally several models on coating growth in SPS have been suggested from experimental observations of coating morphologies obtained with varying sets of process parameters [14][15][16][17][18]. These models all agree on the great influence of particle direction and velocity when impacting the substrate on the resulting coating morphology.…”

Section: Introductionmentioning

confidence: 94%

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: Introductionmentioning

confidence: 94%

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

et al. 2020

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“…To mix the suspension properly and to break existing particle-aggregates, ultrasonic devices are typically used. The suspension can be injected into the high-velocity high-temperature plasma flow using either a mechanical injection system with a simple nozzle or a twin-fluid atomizer such as air-blast and effervescent [5][6][7][8][9]. In the former case, the interaction of a continuous liquid jet with the plasma flow results in the suspension breakup and After the suspension breakup, the liquid evaporation becomes dominant.…”

Section: Introductionmentioning

confidence: 99%

“…), particle size, particle type and concentration, dispersant type and concentration, plasma fluctuations, momentum and temperature, standoff distance, substrate shape, etc. [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…In all those simulations, a stream of the suspension droplets was injected from a simple plain orifice. However, as mentioned above and shown in Figure 1-right, twin-fluid atomizers such as air-blast and effervescent have been used in the suspension plasma spraying as well [6,8,9]. Despite the complexity of these processes and the challenges in the experimental measurements, numerical simulations are performed in the present study to understand the effect of air-blast suspension spray on the plasma crossflow and the droplet/particle in-flight behavior.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study of the Effects of Twin-Fluid Atomization on the Suspension Plasma Spraying Process

Jadidi

Moghtadernejad

Hanson

2020

Fluids

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Suspension plasma spraying (SPS) is an effective technique to enhance the quality of the thermal barrier, wear-resistant, corrosion-resistant, and superhydrophobic coatings. To create the suspension in the SPS technique, nano and sub-micron solid particles are added to a base liquid (typically water or ethanol). Subsequently, by using either a mechanical injection system with a plain orifice or a twin-fluid atomizer (e.g., air-blast or effervescent), the suspension is injected into the high-velocity high-temperature plasma flow. In the present work, we simulate the interactions between the air-blast suspension spray and the plasma crossflow by using a three-dimensional two-way coupled Eulerian–Lagrangian model. Here, the suspension consists of ethanol (85 wt.%) and nickel (15 wt.%). Furthermore, at the standoff distance of 40 mm, a flat substrate is placed. To model the turbulence and the droplet breakup, Reynolds Stress Model (RSM) and Kelvin-Helmholtz Rayleigh-Taylor breakup model are used, respectively. Tracking of the fine particles is continued after suspension’s fragmentation and evaporation, until their deposition on the substrate. In addition, the effects of several parameters such as suspension mass flow rate, spray angle, and injector location on the in-flight behavior of droplets/particles as well as the particle velocity and temperature upon impact are investigated. It is shown that the injector location and the spray angle have a significant influence on the droplet/particle in-flight behavior. If the injector is far from the plasma or the spray angle is too wide, the particle temperature and velocity upon impact decrease considerably.

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Trends and Perspectives in Mitigating CMAS Infiltration in Thermal Barrier Coating

Gaudin,

Despres,

Dolmaire

et al. 2023

Engineering Materials

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Optimization of the injection with a twin-fluid atomizer for suspension plasma spray process using three non-intrusive diagnostic tools

Cited by 10 publications

References 23 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

Numerical Study of the Effects of Twin-Fluid Atomization on the Suspension Plasma Spraying Process

Trends and Perspectives in Mitigating CMAS Infiltration in Thermal Barrier Coating

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