Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Commissariat a L'energie Atomique

Bruno Pintault

Philippe Belleville

Christian Belouet

Clément Sanchez

Luc Bianchi

David Guenadou

Karine Valle

Joël Toulc'Hoat

Pascal Vissie

Axel Dieraert

Max Grosil

Christophe Boscher

A composition which can be photopolymerized to make a part consisting of an oxide ceramic, or a hybrid part comprising at least one oxide ceramic and organic constituents, by a stereolithographic technique, the composition comprising: at least one photopolymerizable organic compound; at least one photo-initiator; at least one precursor of the oxide ceramic wherein the composition comprises from 25% to 70% by mass, relative to the total mass of the composition, of the at least one precursor of the oxide ceramic; and wherein the at least one precursor of the oxide ceramic comprises a mixture comprising a nanometric powder of the oxide ceramic, and at least one other element selected from a micrometric powder of the oxide ceramic and a pre-ceramic compound of the oxide ceramic.

Composition and method for making parts consisting of oxide ceramics or hybrid parts by a stereolithographic technique

A method for manufacturing a single crystal may be by solution growth from a seed crystal, in a unit including a tank and a growth platform having a lower plate. The method may include: fastening the seed to the lower plate; introducing a crystallization solution of density dinto the tank; treating the solution in order to render it supersaturated; bringing the seed into contact with the supersaturated solution; rotating the platform until the single crystal is obtained. Before bringing the seed into contact with the supersaturated solution, the method may include forming, in the tank, of a zone for trapping parasitic crystals of density dby introducing, into the tank, a liquid, immiscible with the growth solution, of density d>dand d<d, which forms with the growth solution an interface located below the lower plate.

Method for manufacturing a single crystal by solution growth enabling trapping of parasitic crystals

A device for growing a flat single crystal from a seed in a crystallization solution. A support element has a support face; a blocking element comprising a blocking face, positioned at a predefined distance from the support face to block the growth of the single crystal in a direction perpendicular to the support face; a seed protection member, configured to protect the seed during a crystallization solution treatment phase and to free a growth zone positioned between the support face and the blocking face during a rotation of the support element; the blocking element comprises a holding member that cooperates with the protection member, the holding member being movable between a first position where it holds the protection member against the support face during the treatment phase and a second position where the holding member is separated from the protection member and participates in the formation of the blocking face.

Device for growing a flat single crystal from a seed crystal in a crystallisation solution and process for manufacturing this single crystal

Process for producing at least one nanoporous layer of nanoparticles chosen from nanoparticles of a metal oxide, nanoparticles of metal oxides, and mixtures of said nanoparticles, on a surface of a substrate, in which at least one colloidal sol, in which said nanoparticles are dispersed and stabilized, is injected into a thermal plasma jet which sprays said nanoparticles onto said surface. Nanoporous layer and device, especially a separation device, comprizing said layer.

Process for producing a nanoporous layer of nanoparticles and layer thus obtained

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Monts, France

Bruno Pintault