Suspension and solution plasma spraying

Fauchais, Pierre; Joulia, Aurélien; Goutier, Simon; Chazelas, Christophe; Vardelle, Michel; Vardelle, Armelle; Rossignol, Sylvie

doi:10.1088/0022-3727/46/22/224015

Cited by 88 publications

(51 citation statements)

References 61 publications

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“…In suspension spraying processes the size of nanostructured coatings depend on a number of parameters, including flame temperature and velocity, suspension feed rate, suspension concentration, suspension's solvent properties, and the atomization of liquid feedstock streams. It was further revealed that the nanoparticles agglomerates size and nanostructured coatings morphology are significantly dependent on the suspension's concentration, viscosity, and surface tension [8,[15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Effects of angular injection, and effervescent atomization on high-velocity suspension flame spray process

Mahrukh

Kumar

2016

Surface and Coatings Technology

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This work presents the nanostructured coating formation using suspension thermal spraying through the HVOF torch. The nanostructured coating formation requires nanosize powder particles to be injected inside a thermal spray torch using liquid feedstock. The liquid feedstock needs to be atomized when injected into the high-velocity oxygen fuel (HVOF) torch. This paper presents the effects of angular injection and effervescent atomization of the liquid feedstock on gas and droplet dynamics, vaporization rate, and secondary breakup in the high-velocity suspension flame spray (HVSFS) process. Different angular injections are tested to obtain the optimum value of the angle of injection. Moreover, effervescent atomization technique based on twin-fluid injection has been studied to increase the efficiency of the HVSFS process. Different solid nanoparticle concentrations in suspension droplets are considered. In angular injection the droplets are injected into the core of the combustion zone; this immediately evaporates the droplets, and evaporation is completed within the torch. The value of 10°-15°i s selected as the optimal angle of injection to improve the gas and droplet dynamics inside the torch, and to avoid the collision with the torch's wall. The efficiency of the effervescent atomization can be enhanced by using high gas-to-liquid mass flow rate ratio, to increase the spray cone angle for injecting the suspension liquid directly into the combustion flame. It is also found that the increment in the nanoparticle concentration has no considerable effects on the droplet disintegration process. However, the location of evaporation is significantly different for homogeneous and non-homogeneous droplets.

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Section: Introductionmentioning

confidence: 99%

Effects of angular injection, and effervescent atomization on high-velocity suspension flame spray process

Mahrukh

Kumar

2016

Surface and Coatings Technology

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“…This gives rise to noncontinuum effects, also known as Knudsen effect, which drastically decrease the heat and momentum transfer from the gas to the particles [46][47][48]. This issue does not affect the HVSFS process, because the highpressure and low-temperature gas (compared to a thermal plasma) possesses lower mean free path [46].…”

Section: Introductionmentioning

confidence: 99%

Comparison between Suspension Plasma Sprayed and High Velocity Suspension Flame Sprayed bioactive coatings

Bolelli

Bellucci

Cannillo

et al. 2015

Surface and Coatings Technology

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“…The torches used in SPPS process are (Fauchais et al, 2013): (i) conventional one-cathode torches having radial introduction of solution, (ii) three-cathode torches having axial introduction of solution, and (iii) segmented anode torches. The jet's temperature, in a conventional plasma torch, reaches 14,000 K and its velocity on the nozzle exit reaches 800 m/s.…”

Section: Solution Precursor Plasma Spraymentioning

confidence: 99%

“…Its flow rate is controlled by the rotation of motor rollers or by the pressure acting on the fluid, respectively. The size of the solution droplets and their velocities in two-phase atomizers, called also effervescent ones, depend on gas-to-liquid ratio (GLR), nozzle design, and liquid properties (surface tension, density, and viscosity) (Killinger et al, 2011;Fauchais et al, 2013). The atomization is a process of which the external energy phase is needed to break up the liquid bulk.…”

Section: Injectionmentioning

confidence: 99%

Application of solution precursor spray techniques to obtain ceramic films and coatings

Pawłowski¹

2015

Future Development of Thermal Spray Coatings

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Suspension and solution plasma spraying

Cited by 88 publications

References 61 publications

Effects of angular injection, and effervescent atomization on high-velocity suspension flame spray process

Effects of angular injection, and effervescent atomization on high-velocity suspension flame spray process

Comparison between Suspension Plasma Sprayed and High Velocity Suspension Flame Sprayed bioactive coatings

Application of solution precursor spray techniques to obtain ceramic films and coatings

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