The fluidization of short Hi Nicalon S fibers was investigated before considering CVD coatings with controlled composition and thicknesses. The fluidization of a short fiber batch alone being delicate and not reproducible, the study consisted in comparing the hydrodynamic behavior of a powder alone, to that of a short fiber/powder mixture. The fluidization behavior of the particle beds was studied by following their pressure drop as a functionof pressure and temperature. The minimum fluidization velocity (U$_{mf}$) was evaluated at room temperature (T$_{amb}$) at different reduced pressures, and at 200 mbar as a function of temperature. The results are in good agreement with the theoretical equations. At low pressures and T$_{amb}$, U$_{mf}$ increases rapidly. In contrast, U$_{mf}$ varies only slightly with temperature. While the pressure does not seem to affect the fluidization behavior of the powder alone, it displays a clear optimum at 200 mbar for the short fiber/powder mixture.< Réduire

Mots clés en anglais

Fluidized bed

Short fibers

SiC powder

Temperature

Pressure

Hydrodynamic

Voir/Ouvrir

Métadonnées

Partager cette publication !

Licence d’utilisation du document

Gaseous fluidization of short fibers and SiC powders, influence of temperature and pressure

Langue

Ce document a été publié dans

Résumé en anglais

Mots clés en anglais

URI

DOI

Unités de recherche