Preparation and spray drying of Al2O3–TiO2 nanoparticle suspensions to obtain nanostructured coatings by APS

Sánchez, E.; Moreno, A.; Vicent, M.; Salvador, M. D.; Bonache, V.; Klyatskina, Elizaveta; Santacruz, Isabel; Moreno, Rodrigo

doi:10.1016/j.surfcoat.2010.06.002

Cited by 42 publications

(63 citation statements)

References 9 publications

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“…First, a 10 vol.% of 87 wt% Al 2 O 3 -13 wt% TiO 2 nanosuspension was prepared by mixing both commercial suspensions [8]. Secondly, a 30 vol.% of Al 2 O 3 -13 wt% TiO 2 submicron-nano suspension was prepared by dispersing nanosized titania particles and submicronic alumina particles in water.…”

Section: Feedstock Preparationmentioning

confidence: 99%

“…Both suspensions were then reconstituted into sprayable granules in 2 steps: a) Spray-drying. Spray-dried agglomerates were obtained in a spray dryer (Mobile Minor, Gea Niro, Denmark) [8,10,11]. b) Thermal treatments.…”

Section: Feedstock Preparationmentioning

confidence: 99%

“…submicronnano sized particles. In previous publication, it was found that the nanostructured spray-dried feedstock obtained from concentrated Al 2 O 3 -13 wt% TiO 2 suspensions yielded coatings with lower void content than those obtained using powders from more diluted suspensions [8].…”

Section: Introductionmentioning

confidence: 97%

“…This method allows the deposition of nanostructured layers with better properties than their conventional counterparts [1][2][3][4][5]. Still, the nanoparticles need to be previously agglomerated into a sprayable powder, as they can not be directly fed into the plasma torch [6][7][8]. This agglomeration process is usually done by using spray-drying [6][7][8][9][10][11] or freezedrying [11] from a nanoparticle suspension, frequently followed by a thermal treatment in order to decrease the granule porosity [6,8].…”

Section: Introductionmentioning

confidence: 99%

“…Still, the nanoparticles need to be previously agglomerated into a sprayable powder, as they can not be directly fed into the plasma torch [6][7][8]. This agglomeration process is usually done by using spray-drying [6][7][8][9][10][11] or freezedrying [11] from a nanoparticle suspension, frequently followed by a thermal treatment in order to decrease the granule porosity [6,8]. The quality of the feedstock depends on the characteristics of the initial nanosuspension, which should present high solid content, low viscosity and high stability.…”

Section: Introductionmentioning

confidence: 99%

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Influence of the feedstock characteristics on the microstructure and properties of Al2O3–TiO2 plasma-sprayed coatings

Vicent

Bannier

Benavente

et al. 2013

Surface and Coatings Technology

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Atmospheric plasma spraying (APS) is an interesting technique to obtain nanostructured coatings due to its versatility, simplicity and relatively low cost. However, nanometric powders can not be fed into the plume using conventional feeding systems, due to their low mass and poor flowability, and must be adequately reconstituted into sprayable micrometric agglomerates.In this work, Al 2 O 3 -13wt%TiO 2 nanostructured and submicron-nanostructured powders were deposited using APS. The feedstocks were obtained by spray drying from two starting suspensions, prepared by mixing two commercial nanosuspensions of Al 2 O 3 and TiO 2 , or by adding nanosized TiO 2 and submicron-sized Al 2 O 3 powders to water. The spray-dried granules were heat-treated to reduce their porosity and the resultant powders were fully characterised.Optimisation of the deposition conditions enabled the reconstituted powders to be successfully deposited, yielding coatings that were well bonded to the substrate. The coating microstructure, characterised by SEM, was formed by semi-molten feedstock agglomerates surrounded by fully molten particles that act as a binder.Moreover, microhardness, adhesion, and tribological behaviour were determined, and the impact of the granule characteristics on these properties was studied. It was found that changing the feedstock characteristics allows to control the coating quality and properties.2

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Section: Feedstock Preparationmentioning

confidence: 99%

Section: Feedstock Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of the feedstock characteristics on the microstructure and properties of Al2O3–TiO2 plasma-sprayed coatings

Vicent

Bannier

Benavente

et al. 2013

Surface and Coatings Technology

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Redispersible Gold Nanoparticle/Polymer Composite Powders Ready for Ligand Exchange Reactions

et al. 2018

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Dry powders embedded with gold nanoparticles (AuNPs) are produced by spray‐drying technique from an aqueous AuNP dispersion in a poly(vinyl alcohol) (PVA) or poly(vinyl pyrrolidone) (PVP) matrix. The prepared powders consist of AuNPs stabilized in hollow capsules of PVA (PVA@AuNP) or PVP (PVP@AuNP) with an average diameter of several micrometers. The AuNP powders are dispersible in water and no agglomeration triggered by the spray drying process of AuNPs is observed. The PVA@AuNP powders are coextruded with polycaprolactone to demonstrate the industrial application of dry‐state AuNPs. With PVP@AuNP the incorporation of AuNP into other stabilizing polymers via ligand exchange method is facilitated. After each step, the active surface of the AuNPs was tested by catalytic studies.

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Tribological Behavior of Plasma-Sprayed Al2O3-20 wt.%TiO2 Coating

Cui

Miao

Liang

et al. 2017

J. of Materi Eng and Perform

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Preparation and spray drying of Al2O3–TiO2 nanoparticle suspensions to obtain nanostructured coatings by APS

Cited by 42 publications

References 9 publications

Influence of the feedstock characteristics on the microstructure and properties of Al2O3–TiO2 plasma-sprayed coatings

Influence of the feedstock characteristics on the microstructure and properties of Al2O3–TiO2 plasma-sprayed coatings

Redispersible Gold Nanoparticle/Polymer Composite Powders Ready for Ligand Exchange Reactions

Tribological Behavior of Plasma-Sprayed Al2O3-20 wt.%TiO2 Coating

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