Centre National De La Recherche Scientifique

Université Paul Sabatier (toulouse Iii)

Commissariat a L'energie Atomique

Thales

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Nippon Telegraph and Telephone Corporation

Centre National Detudes Spatiales

Universite Paul Sabatier

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

Universite Toulouse III – Paul Sabatier

Asb Aerospatiale Batteries

Philippe Tailhades

Abel C Rousset

Lionel Presmanes

Laurence Bouet

Hiroshi Yoshikawa

Jean-Louis Ouvrier-Buffet

Manabu Yamamoto

Jean-Pierre Bonino

Olivier Vendier

Takaya Tanabe

Paul Mollard

Akinori Furuya

Toshifumi Ohkubo

Michel Gougeon

Corinne Bonningue

Corine Despax

Patrick Langlade

Isabelle Pasquet

Christiane B Salvaing

Pierre Imperinetti

Claire Vialle

Wilfried Rabaud

Bruno Mauvernay

Astrid Astier

Véronique Conedera

Alain Manoux

Val&eacute;rie Carles

Frédéric Veron

Valérie Baco-carles

Kateryna Kiryukhina

Stephanie Capdeville

Hoa Le Trong

Valérie Baco

Lidwine Raynaud

Pierre-François Calmon

Abel Rousset

Valerie Carles

Stéphanie Capdeville

Corine Bonningue

A process for manufacturing a multi-material part by additive manufacturing, includes the following steps: a) a step of providing a pre-treated metal powder comprising grains and an oxidized and porous layer on a surface of the grains; b) a selective laser powder-bed fusion step comprising implementation of steps i) and ii) as follows: i) a step of forming a layer from the pre-treated metal powder; ii) a step of melting by laser the layer, the melting step being carried out under a reactive atmosphere and comprising changing parameters of application of the laser so that at least a first region of the layer is converted so as to lower the electrical conductivity thereof, thus forming a dielectric, and so that at least a second region of the layer is densified without converting it, the at least a first region being formed when the parameters of application of the laser allow a first energy density to be applied to the first region and/or the laser beam to be kept for a first dwell time on the first region, the at least a second region being formed when the parameters of application of the laser allow a second energy density to be applied to the second region and/or the laser beam to be kept for a second dwell time on the second region, and the first energy density being higher than the second energy density and/or the first dwell time being longer than the second dwell time. A part obtained using the process is also provided.

Method for manufacturing a multi-material part by additive manufacturing, using the technique of powder bed selective laser melting or selective laser sintering

The invention relates to the use of a material having a spinel ferrite/iron monoxide structure as a sensitive material in the form of a thin film for the bolometric detection of infrared radiation, the chemical composition of said structure, excluding doping agents that may be present, having empirical formula (I): (FeM)O, where x is strictly less than 1 and strictly greater than 0.75. The invention also relates to a bolometric device for infrared radiation detection and infrared imaging, comprising at least one sensor provided with a sensitive element in the form of a thin film as defined above.

Use of a combination of iron monoxide and spinel oxides as a sensitive material for detecting infrared radiation

A process for manufacturing a device comprising at least a support and a component, joined together by at least one braze, includes a brazing operation which is carried out starting from a metal oxalate. Advantageously, it is a silver oxalate or a mixture of silver and copper oxalates, the component and/or the support being covered with a film comprising gold or copper in contact with said braze and the component possibly being a power component.

Process for manufacturing a device comprising brazes produced from metal oxalate

The present invention relates to the use as a sensitive material in a thin layer for bolometric detection of infrared radiation, of a material having a spinel ferrite structure of chemical composition, ignoring doping agents if any are present, satisfying empirical formula I:FeMAO.The invention also provides a bolometric device for detecting infrared radiation or for infrared imaging, and including at least one sensor provided with a sensitive element in the form of a thin layer as defined above.

Use of spinel ferrites as sensitive material for bolometric infrared detector devices

A magneto-optical recording medium has a recording layer and a reflective layer on a substrate. The recording layer has a layered structure in which at least one spinel ferrite (or rutile-type oxide or hematite) layer and at least one garnet ferrite layer are piled together. It is preferable that the layered structure is formed on tracks where data are recorded. A manufacturing method comprises the steps of heat treatment in the range of 500-700&#xb0; C., preferably 600-630&#xb0; C., after the formation of the recording layer. In the magneto-optical recording and playback device to record and play back data, the wavelength of light for recording data is different from that for reading data, which is preferable for a magneto-optical recording medium comprising a garnet ferrite layer.

Magneto-optical recording medium, manufacturing method thereof and magneto-optical data recording and playback device

This invention relates to magneto-optical recording media such as magneto-optical disks and cards, manufacturing methods of the medium and a magneto-optical recording and playback device to record and play back data using the magneto-optical recording media. The magneto-optical recording medium of the present invention has a recording layer and a reflective layer on a substrate, and the recording layer has a layered structure in which at least one spinel ferrite (or rutile-type oxide or hematite) layer and at least one garnet ferrite layer are piled together. It is preferable that the layered structure is formed on tracks where data are recorded. The manufacturing method of the present invention comprises the steps of heat treatment in the range of 500-700&deg; C., preferably 600-630&deg; C., after the formation of the recording layer. In the magneto-optical recording and playback device to record and play back data of the present invention, the wavelength of light for recording data is different from that for reading data, which is preferable for a magneto-optical recording medium comprising a garnet ferrite layer.

Opto-magnetic recording medium with a garnet ferrite recording layer, and opto-magnetic information recording/reproducing device

The invention relates to a method of preparing metal powder comprising: preparing a simple or mixed oxalate of one or more metals formed of particles with needle-like morphology having a mean acicularity ratio (length/diameter) of from 4 to 20, and a length of from 5 to 10 microns and converting said oxalate to metal or metal alloy powder by reducing treatment with gaseous hydrogen. The conversion of said oxalate can be carried out by decomposing said oxalate, in air, to an oxide and then reducing said oxide to metal or metal alloy. The metal is chosen from among the rare earth metals and the transition metals, preferably from among iron, cobalt, and nickel. The method is particularly suitable for making iron powder metal having a spongy and filament-like microstructure which makes it suitable for use in heating composition for thermo-piles. In addition, the invention relates to metal compacts unstoved or annealed which are obtained by applying compaction pressure to the powders according to the invention.

Method of preparing metal powders, metal powders prepared in this way and compacts that include these powders

Composite material for magnetooptic recording, comprising a thin layer deposited on a non-magnetic solid substrate. The said thin layer is a polycrystalline layer consisting of microcrystals having a structure of a vacant-site spinel ferrite, based on iron, cobalt and transition metals. By virtue of a particular process for producing the thin layers, enabling especially the size of the crystallites to be increased, it is possible to optimize the magnetic and magnetooptic properties and to obtain thin layers having, for example, a remanent Faraday rotation and a coercive field which are greater, respectively, than 1 degree per micron for the Faraday rotation and 1000 Oe for the coercive field.

Composite material for magnetooptic recording its preparation and its use

Compositions of particulate magnetic oxides with a defect spinel

Particulate compositions of ferromagnetic metal oxalates in the form of

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Saint Orens, France

Philippe Tailhades