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Evolution du niveau d'agglomération de nanopoudres d'aluminium : une approche rhéologique

Abstract : From micrometric size to nanometric size, the increase of the surface energies allows the agglomeration to be preponderant and then, the risks linked to powders are changed. When the toxicity, the inflammation and explosion risks of nanoparticles are mentioned, the agglomerates must be taken into account. The effect of agglomeration in the behavior of nanopowders has been studied from experimental observation of agglomerated nanopowders of aluminum subjected to shear in a powder rheometer. In order to understand the effect of deagglomeration on the powders, the agglomerate strength has been estimated thanks to the porosity of the powder bed contained in the rheometer cell. This one is ranged between 10 kPa and 1 MPa. The rheological tests show that, compared with the micrometric aluminum, the aluminum nanopowders have a peculiar behavior in the Geldart's classification, being in both class A and C. This fact is due to the facility of nanoparticles to agglomerate and to stay agglomerated.
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  • HAL Id : ineris-00973634, version 1
  • INERIS : EN-2011-374

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François Henry, Philippe Marchal, Jacques Bouillard, Alexis Vignes, Olivier Dufaud, et al.. Evolution du niveau d'agglomération de nanopoudres d'aluminium : une approche rhéologique. 13. Congrès de la Société Française de Génie des Procédés "Des procédés au service du produit au coeur de l'Europe" (SFGP 2011), Nov 2011, Lille, France. pp.NC. ⟨ineris-00973634⟩

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