Predicting dynamic and thermal histories of agglomerated particles injected within a d.c. plasma jet

Ettouil, Fadhel Ben; Мажорова, О. С.; Pateyron, Bernard; Ageorges, Hélène; Ganaoui, M. El; Fauchais, Pierre

doi:10.1016/j.surfcoat.2008.04.032

Cited by 31 publications

(16 citation statements)

References 12 publications

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“…Bertrand et al [28] showed that the combination of dense powder with large agglomerate size produces coatings with very high amount of unmolten areas in TiO 2 coatings whenever low energy spraying conditions were used. In fact, calculations with zirconia powder [29] have proven that dense (5680 kg/m 3 ) zirconia agglomerates, 50 µm in diameter, melt much more than porous (2840 kg/m 3 ) due to the better heat propagation. Following all this research, in this work, we have shown that the use of high density spray-dried agglomerates in the feeding powder gives rise to low porosity coatings with a quite homogeneous microstructure leading to optimal mechanical properties.…”

Section: Coating Mechanical Propertiesmentioning

confidence: 99%

Atmospheric plasma spraying coatings from alumina–titania feedstock comprising bimodal particle size distributions

Vicent

Bannier

Moreno

et al. 2013

Journal of the European Ceramic Society

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Section: Coating Mechanical Propertiesmentioning

confidence: 99%

Atmospheric plasma spraying coatings from alumina–titania feedstock comprising bimodal particle size distributions

Vicent

Bannier

Moreno

et al. 2013

Journal of the European Ceramic Society

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“…Thus, plasma-sprayed coatings significantly varied with the feedstock powders, even though the powders have same chemical composition and size distribution, owing to the difference in powder morphology according to its manufacturing methods ( Ref 18,[20][21][22]. The powder features (size, shape, morphology, specific mass, and injection rate) must be adapted according to the spray process and spray parameters (Ref [17][18][19][20][21][22][23][24]. Especially in RPS, particle size is considered to be the most important factor.…”

Section: Introductionmentioning

confidence: 99%

Reactive Atmospheric Plasma Spraying of AlN Coatings: Influence of Aluminum Feedstock Particle Size

et al. 2010

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Feedstock powder characteristics (size distribution, morphology, shape, specific mass, and injection rate) are considered to be one of the key factors in controlling plasma-sprayed coatings microstructure and properties. The influence of feedstock powder characteristics to control the reaction and coatings microstructure in reactive plasma spraying process (RPS) is still unclear. This study, investigated the influence of feedstock particle size in RPS of aluminum nitride (AlN) coatings, through plasma nitriding of aluminum (Al) feedstock powders. It was possible to fabricate AlN-based coatings through plasma nitriding of all kinds of Al powders in atmospheric plasma spray (APS) process. The nitriding ratio was improved with decreasing the particle size of feedstock powder, due to improving the nitriding reaction during flight. However, decreasing the particle size of feedstock powder suppressed the coatings thickness. Due to the loss of the powder during the injection, the excessive vaporization of fine Al particles and the completing nitriding reaction of some fine Al particles during flight. The feedstock particle size directly affects on the nitriding, melting, flowability, and the vaporization behaviors of Al powders during spraying. It concluded that using smaller particle size powders is useful for improving the nitriding ratio and not suitable for fabrication thick AlN coatings in reactive plasma spray process. To fabricate thick AlN coatings through RPS, enhancing the nitriding reaction of Al powders with large particle size during spraying is required.

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“…The hollow structure of HOSP-produced powders, compared to denser plasma spheroidized ones, provides them with a higher porosity. The effect of this increased powder porosity on in-flight particle properties is quite complex as it involves reduction in powder thermal conductivity, gas entrapment kinetics and diameter reduction during flight [17,18]. Assuming for instance that an increase in porosity from powder H to E corresponds to a decrease in overall in-flight particle density ρ p and diameter d p , Eq.…”

Section: Powder Type (Size/shape)mentioning

confidence: 99%

Combustion Flame Spray of CoNiCrAlY & YSZ coatings

Fanicchia

Axinte

Kell

et al. 2017

Surface and Coatings Technology

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The properties of CoNiCrAlY and ∼7-8%YSZ layers, used as thermal barrier coatings (TBC) to protect hot gas paths of power generation and aerospace gas turbines, that have been deposited through the Combustion Flame Spray (CFS) process, are assessed and compared to coatings of the same materials deposited through Atmospheric Plasma Spray (APS). Fuel-to-oxygen equivalence ratio, combustion and carrier gases flows, torch standoff distance and powder feed rate values have been varied during the CFS tests in order to assess their effect on microstructural characteristics, i.e. thickness, total porosity, oxide level and microhardness. Results show that, in CFS-deposited coatings, although a higher content of oxide strings and porosity is observed compared to APS, also comparable phase transformations and a higher thermal cyclic lifetime can be achieved with an appropriate tuning of the deposition parameters. Thus, the study demonstrates the excellent capability of the CFS process in depositing thermal barrier coating systems, providing a viable alternative deposition technology for this class of materials at significant hardware simplicity. As the CFS setup has a simple design, this research stimulates a miniaturization concept of the combustion flame spray torch for allowing its deployment into highly restricted workspaces.

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Predicting dynamic and thermal histories of agglomerated particles injected within a d.c. plasma jet

Cited by 31 publications

References 12 publications

Atmospheric plasma spraying coatings from alumina–titania feedstock comprising bimodal particle size distributions

Atmospheric plasma spraying coatings from alumina–titania feedstock comprising bimodal particle size distributions

Reactive Atmospheric Plasma Spraying of AlN Coatings: Influence of Aluminum Feedstock Particle Size

Combustion Flame Spray of CoNiCrAlY & YSZ coatings

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