Dispositif de déposition de couches de suspensions de céramiques appliqué à la stéréolithographie

Abstract

Un dispositif de déposition de couches uniformes de suspensions de céramiques a été mis au point en vue d'applications pour le prototypage rapide. Le système de raclage se compose d'une buse d'injection de gaz de hauteur, d'angle d'attaque et de pression réglables. L'homogénéité des couches étalées ainsi que la reproductibilité du procédé ont été étudiées. La mise en place d'un plan d'expérience a également conduit à la caractérisation de l'influence de chaque paramètre sur l'épaisseur de couche déposée et a permis de proposer un modèle mathématique fiable en vue d'optimiser le dispositif de dépôt.

Flow distribution property of the constructal distributor and heat transfer intensification in a mini heat exchanger

“…Their multi-scale internal channel structures are optimized by minimizing the viscous dissipation and the residence time simultaneously according to the ''constructal theory.'' [27][28][29] Polymer prototypes of the constructal components were manufactured using Stereolithography 30,31 at the ''Département de Chimie Physique des Réactions'' in Nancy, France. These fluid distributors, along with other multi-scale components such as mixers, heat exchangers, 32 are to our knowledge the first series of ''constructal'' prototypes realized for engineering applications.…”

Influence of the geometry of a monolithic support on the efficiency of photocatalyst for air cleaning

“…The steps of the fabrication are as follow: firstly, the object to be built is designed thanks to computer-aided design software. Successive horizontal cross sections are then computed by CAD with a period of typically 100 m. These sections are then converted by the machine into physical layers so that the object is physically built layer by layer (Dufaud and Corbel, 2004).…”

Modeling of Deformations of Photolithographic Objects

“…The principal of the simulation model is the following: a variation of the elementary volume is associated to each stage of the kinetic model given by equations (1) to (13), this variation depends on the size of the reacting molecules. A small volumetric variation ∆V 0 is associated to the conversion of the monomer molecules, a large volumetric variation ∆V 1 is associated to the macroradicals having a single active center, and a larger volumetric variation ∆V 2 is associated to the macroradicals having more than one active center (the volumetric variation due to reticulation increases with the number of active centers).…”

“…The first one consists in acting on the material by using a resin with a low shrinkage [8,9,10], a resin charged by a rigid material or a powder suspension in a liquid resin [11]. In the second manner, the system is directly influenced and especially new motives of filling the layers are used [12,13] in order to reduce the deformations. This latter solution needs the understanding of the kinetics of shrinkage and deformation.…”