The invention relates to a polycrystalline silicon carbide part having improved properties of porosity and homogeneity, to the use thereof as a source of silicon carbide for growing silicon carbide single crystals, to the method for producing same, and to a PVT growth method using such a silicon carbide part.
C04B 35/565 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxides based on carbides based on silicon carbide
A process for preparing a sintered silicon carbide body including
sintering a sample including silicon carbide particles to form a shaped sintered silicon carbide body, the particles containing a silicon carbide core and a surface layer containing carbon and oxygen, the sample having at least 90 weight % being C or Si and having a carbon to silicon molar ratio molC/molSi higher than 1 and a carbon in excess to oxygen molar ratio Cex/molO which is higher than 0.5 and lower than 5.3.
C04B 35/565 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxides based on carbides based on silicon carbide
C04B 35/626 - Preparing or treating the powders individually or as batches
3.
PROCESS FOR PRODUCING SINTERED SILICON CARBIDE BODIES
A process for preparing a sintered silicon carbide body comprising a step of : Sintering a sample comprising silicon carbide particles to form a shaped sintered silicon carbide body, said particles containing a silicon carbide core and a surface layer containing carbon and oxygen, said sample having at least 90 weight% being C or Si and having a carbon to silicon molar ratio molC/molSi higher than 1 and a carbon in excess to oxygen molar ratio Cex/molO which is higher than 0.5 and lower than 5.3.
C04B 35/565 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxides based on carbides based on silicon carbide
A production method is provided in which submicronic particles containing silicon are incorporated into a matrix, wherein, during the incorporation of the particles, the particles are in a compacted state with a bulk density of more than 0.10 grams per cubic centimeter, and the compacted particles have a specific surface area at least 70% of that of the particles considered separately without contact between each other.
The invention relates to a production method in which submicronic particles containing silicon are incorporated into a matrix, characterised in that, during the incorporation of said particles, the particles are in a compacted state with a bulk density of more than 0.10 grams per cubic centimetre, and the compacted particles have a specific surface area at least 70% of that of the particles considered separately without contact between each other.
A method for producing a material, in which method the following products are incorporated so as to produce a mixture: a polymer; and particles including silicon and carbon. A feature of the method is that during the incorporation of the particles, the particles have an apparent density of more than 0.3 grams per cubic centimeter. Also, in embodiments, the particles have an average diameter which is less than or equal to 100 nanometers, preferably with a standard deviation which is less than 50% of the average diameter.
C08L 27/12 - Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogenCompositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
7.
METHOD FOR PRODUCING A MATERIAL CONTAINING A POLYMER
The invention relates to a method for producing a material, in which method the following products are incorporated so as to produce a mixture: a polymer; and particles comprising silicon and carbon. The invention is characterised in that: during the incorporation of the particles, the particles have an apparent density of more than 0.3 grams per cubic centimetre; and the particles have an average diameter which is less than or equal to 100 nanometers, preferably with a standard deviation which is less than 50% of said average diameter.
Disclosed is a method for producing particles, including the steps: introducing, into a reaction chamber, at least one reaction flow including a first chemical element and propagating in a direction of flow; projecting a radiation beam through the reaction chamber, intersecting each reaction stream in one interaction area per reaction flow, to form, in each reaction flow, particle cores including the first chemical element; and introducing, into the reaction chamber, a second chemical element interacting with each reaction flow to cover the particle cores with a layer including the second chemical element. Each reaction flow is preferably free of any agent oxidizing the first chemical element. Preferably a ratio of one atom of the second element is introduced per unit of time for at least two atoms of the first element introduced per unit of time. The second element is preferably introduced in at least one confined flow.
C23C 16/44 - Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
C01B 33/027 - Preparation by decomposition or reduction of gaseous or vaporised silicon compounds other than silica or silica-containing material
C01B 33/029 - Preparation by decomposition or reduction of gaseous or vaporised silicon compounds other than silica or silica-containing material by decomposition of monosilane
The present invention relates to a method for producing particles (10), including the following steps: introducing into a reaction chamber at least one reaction flow (1) including a first chemical element (typically silicon) and propagating in a flow direction (11); projecting a ray beam (3) through the reaction chamber, intersecting each reaction flow (1) in an reaction flow interaction area (14), in order to form, in each reaction flow, the cores of particles including the first chemical element, and introducing, in the reaction chamber, a second chemical element (for example, aluminum), interacting with each reaction flow (1) in order to cover the cores of particles with a layer including the second chemical element. Each reaction flow (1) is preferably free of an agent oxidizing the first chemical element
B01J 19/12 - Processes employing the direct application of electric or wave energy, or particle radiationApparatus therefor employing electromagnetic waves
10.
METHOD FOR PRODUCING MULTILAYER SUBMICRON PARTICLES BY LASER PYROLYSIS
The present invention concerns a method for producing particles (10), comprising the following steps: introducing, into a reaction chamber, at least one reaction flow (1) comprising a first chemical element (typically silicon) and propagating in a direction of flow (11); projecting a radiation beam (3) through the reaction chamber, intersecting each reaction stream (1) in one interaction area (14) per reaction flow, to form, in each reaction flow, particle cores comprising the first chemical element; and introducing, into the reaction chamber, a second chemical element (for example carbon) interacting with each reaction flow (1) to cover the particle cores with a layer comprising the second chemical element. Each reaction flow (1) is preferably free of any agent oxidising the first chemical element. Preferably a ratio of one atom of the second element is introduced per unit of time for at least two atoms of the first element introduced per unit of time. The second element is preferably introduced in at least one confined flow (2).
C01B 33/029 - Preparation by decomposition or reduction of gaseous or vaporised silicon compounds other than silica or silica-containing material by decomposition of monosilane
11.
VALVE AND SEALED CONTAINER FOR SUBMICRON PARTICLES, AND METHOD FOR USING SAME
The present invention concerns a container with improved sealing, for improved security in the event of loading, transporting and/or unloading submicron particles, in particular nanopowder/nanoparticles. Such a container can, for example, include a connector for injecting liquid and/or gas. Such a container can also contain at least one inflatable seal (40) valve (3; 4). The container is provided with means for changing the physical state of the material by heating, mixing or ultrasound bombardment. The invention also concerns a method for using the container according to the invention. The invention also concerns an inflatable seal valve.
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