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

Fluidized Bed Chemical Vapor Deposition of Pyrocarbon on Various Types of Powders: Heat and Mass Transfer Analyses and Nanotexture Characterization

“…(ii) the process can be used on other systems, either by changing the reactants to deposit other solids (carbides, nitrides, oxides, borides, etc.) or by changing the starting powders; for instance, milled fibers are good candidates for precursor materials of discontinuous fiber CMCs [39,40], that can be used as feedstock for additive manufacturing.…”

Fluidization of variable short fiber/powder mixtures: hydrodynamic investigation

“…The different elements of the fluidized bed reactor and the particle characteristics of the powder and short fibers have been described in detail elsewhere [33]. The hydrodynamic study was performed on SIKA ® TECH silicon carbide (SiC) powders from Fiven, and Hi-Nicalon type S SiC fibers from NGS Advanced Fibers Co., Ltd.…”

“…The mathematical developments of the Ergün and modified Darcy-Klinkenberg equations have been described in detail elsewhere [33] and the results are respectively summarized below, see Equations ( 3) and ( 5). The equation of Zarekar et al [35] has also been considered in its most complete form by introducing the squared Knudsen term, i.e.…”

“…In our previous study [33], the coefficients n 1 = 1 and n 4 = 0.2108 ± 0.0313 have been proposed for two different types of load, the first one consisting only of powder and the second one of a certain fiber fraction in the mixture.…”

“…We have previously investigated the fluidization behavior of a fiber/powder mixture and compared it to that of a pure powder bed [33]. The study demonstrates the possibility of fluidizing a load with a fraction of short fibers mixed with micrometric powders.…”