Commissariat a L'energie Atomique Et Aux Energies Alternatives

Hicham Maskrot

Fernando Lomello

Pierre-François Giroux

Benoit Guizard

Pascal Aubry

Aziz Chniouel

Frédéric Schuster

Alexandre Michau

Yann Leconte

Francois Tenegal

Alexandre Semerok

Elodie Vasquez

Olivier Hercher

Laurent Chaffron

Marine Chaussiniac

Khalil Abdelkebir

Benoît Guizard

Jérôme Pradel

Cyrine Brahim

Jean-Baptiste Sirven

Pascale Dewalle

Youssef Atman

A metallic filter () includes a microstructured architecture () defined in a three-dimensional space having orthogonal axes, microstructured architecture () includes a metallic network () formed by a plurality of longitudinal connecting strands (), namely extending along a longitudinal axis direction (X), and a network () of pores formed of a plurality of longitudinal interstices () located along connecting strands (). Each longitudinal interstice corresponding to a subset of pores () of the network () of pores. The subset of pores () for which the pores are aligned along the longitudinal axis (X), the longitudinal interstices () thereby defining an axis of anisotropy of the microstructured architecture.

Metallic filter with microstructured architecture of controlled porosity and process for manufacturing such a filter

A method for producing a reinforced alloy powder containing a metal matrix in which crystalline oxide particles are dispersed, including: (i) providing a powder mixture including a parent metal powder including a master alloy for forming the metal matrix and an additional powder including an intermediate; (ii) milling the powder mixture by a mechanical synthesis process to make a precursor powder; and (iii) subjecting the precursor powder to a thermal plasma generated by a plasma torch including a plasma gas. The master alloy is iron-based, nickel-based, or aluminum-based. The intermediate is at least one of YFe, YO, FeO, FeTi, FeCrWTi, TiH, TiO, AlO, HfO, SiO, ZrO, ThO, and MgO. In (iii), the precursor powder is injected into the plasma torch at a flow rate of 10-30 g/min, a power of the plasma torch is 20-40 kW, and a pressure in a reaction chamber of the plasma torch is 25-100 kPa.

ODS alloy powder, method for producing same by means of plasma treatment, and use thereof

Part comprising a steel material whose constituent grains comprise a matrix in which precipitates are incorporated, the precipitates comprising at least one metallic element selected from a metallic element M, a metallic element M′, a metallic element M″ or mixtures thereof; the microstructure of the steel being such that the grains are equiaxed and the average grain size being such that the average of their largest dimension “D max” and/or the average of their smallest dimension “D min” is comprised between 10 μm and 50 μm. The steel material has optimised, stable and isotropic mechanical properties, in particular so that the steel material can best withstand mechanical and/or thermal stresses.

Part comprising an optimized steel material and its manufacturing process

Process for the manufacture of a steel material, wherein the grains of which it is composed comprise a matrix into which precipitates are incorporated, the precipitates comprising at least one metallic element selected from a metallic element M, a metallic element M′, a metallic element M″ or mixtures thereof; the microstructure of the steel being such that the grains are equiaxial and the average size of the grains being such that the average of their largest dimension “Dmax” and/or the average of their smallest dimension “Dmin” is in the range 10 μm to 50 μm. The steel material has optimised, stable and isotropic mechanical properties, in particular so that the steel material is more resistant to mechanical and/or thermal stresses.

Process for the manufacture of an optimised steel material

A non-destructive method for characterizing and monitoring the homogeneity of metal parts which are being manufactured by sintering and comprise several distinct zones. Laser radiation is applied successively to each zone and each sintered zone is analyzed simultaneously in real time by lock-in laser-active radiometry.

Method for characterising and monitoring the homogeneity of metal parts manufactured by laser sintering

Steel material whose constituent grains comprise a matrix in which precipitates are incorporated, the precipitates comprising at least one metallic element selected from a metallic element M, a metallic element M', a metallic element M&#x2033; or mixtures thereof; the microstructure of the steel being such that the grains are equiaxed and the average grain size being such that the average of their largest dimension 'Dmax' and/or the average of their smallest dimension 'Dmin' is comprised between 10 &#x3bc;m and 50 &#x3bc;m. The steel material has optimized, stable and isotropic mechanical properties, in particular so that the steel material can best withstand mechanical and/or thermal stresses.

Optimized steel material

The invention relates to a smoke analysis characterization cell employing optical spectroscopy, which comprises: a reaction chamber, an inlet orifice for injecting smoke into the reaction chamber; an outlet orifice for discharging the smoke from the reaction chamber; and an analysis window for the entry of a laser beam intended to form the plasma inside the reaction chamber, which cell is characterized in that the system further includes a blower for blowing an inert gas close to the analysis window; and a shielding gas injector for the shielded injection of the smoke into the reaction chamber, the shielding being provided by a jet of inert gas around the smoke.

Smoke analysis characterization cell

A device and a method for producing suspensions or wet pastes of nanoparticles or ultra-fine particles. The method comprises: introducing a flow of particles of nanometric or submicronic size into a first compartment of a chamber having a bulk density between 15 and 100 g/L; forming, in the first compartment, a spray of droplets between 1 and 10 micrometers in size, by injecting a solvent in liquid or gas form into a second compartment of the device and passing said solvent through the filtering means, the solvent being chosen from the solvents which are liquid at ambient temperature and at atmospheric pressure; stopping the formation of the spray when the entire quantity of particles contained in the first compartment forms, as required, with the solvent, a suspension comprising between 80 and 99.9% solvent, if the solvent is introduced into the second compartment in liquid form, or a wet paste comprising between 1 and 10% solvent, if the solvent is introduced into the second compartment in gas form; recovering the suspension or wet paste formed.

Device and method for producing suspensions or wet pastes of nanopowders or ultra-fine powders

A method is followed to prepare a powder that includes carbon, silicon and boron, the silicon being in silicon carbide form and the boron being in boron carbide and/or free boron form. The method includes contacting a carbon-based precursor, a silicon-based precursor and a boron-based precursor BX3, X being a halogen atom, to obtain a mixture of these three precursors. The resulting mixture is subjected to laser pyrolysis. The boron-based precursor BX3 is heated, prior to the contacting step and/or simultaneously with the contacting step, to a temperature higher than the condensation temperature of the precursor.

Method for preparing a powder comprising carbon, silicon and boron, the silicon being in silicon carbide form and the boron being in boron carbide form and/or boron alone

A method of forming micrometric or millimetric sized granules by the agglomeration of nanometric sized particles, comprising the addition of a set of nanometric sized particles into a container having an inside wall surface with a circular or approximately circular section and setting the set of particles in motion along said inside wall surface by rotating the container about a rotation axis passing through said container. The setting in motion of the particles is done in a dry state and the container is rotated continuously at constant speed for several consecutive hours.

Method for the dry granulation of nanometric particles

A method for elaborating carbon nanotubes on a substrate is provided. The method may comprise a step for growing on the substrate the nanotubes by chemical vapor deposition by having a stream comprising a carbon source, a precursor source of an oxide compound and, optionally a catalyst source, pass over the substrate.

Method for elaborating carbon nanotubes on a substrate

A device for recovering nanometer or sub-micron particles carried by a gas by generating a stabilized suspension, including: a vessel including a mechanism injecting a liquid; a gas discharge mechanism in an upper portion thereof, located near a particle filter; a particle suspension outlet; and a liquid ring pump, transferring and dispersing particles carried by a gas into a liquid. The pump introduces a gas laden with nanometer or sub-micron particles into the pump; injects at least one liquid into the pump; and discharges the mixture obtained following the transfer. The vessel also includes a mechanism introducing the mixture into the vessel and at least one piezoelectric pellet, immersed in the vessel, configured to generate a fog of micron-sized droplets.

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Montlhery, France

Hicham Maskrot