ADDITIVE MANUFACTURING POWDERS WITH IMPROVED PHYSICAL CHARACTERISTICS, METHOD OF MANUFACTURE AND USE THEREOF

In additive manufacturing operations, powders used in stereolithographic processes need to be precisely spread out in a uniform fashion at every pass of the stereolithographic process to ensure predictability in powder surface morphology. Typically, this is difficult to achieve with conventional pow...

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Bibliographische Detailangaben
Hauptverfasser:	RAHMA, Hakim, CAUCHY, Xavier
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	ADDITIVE MANUFACTURING TECHNOLOGY ADDITIVE MANUFACTURING, i.e. MANUFACTURING OFTHREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVEAGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING,STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING ARTIFICIAL STONE CASTING CEMENTS CERAMICS CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS CONCRETE LIME, MAGNESIA MAKING METALLIC POWDER MANUFACTURE OF ARTICLES FROM METALLIC POWDER METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS POWDER METALLURGY REFRACTORIES SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS SLAG THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING TREATMENT OF NATURAL STONE WORKING METALLIC POWDER WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	In additive manufacturing operations, powders used in stereolithographic processes need to be precisely spread out in a uniform fashion at every pass of the stereolithographic process to ensure predictability in powder surface morphology. Typically, this is difficult to achieve with conventional powders because often these powders suffer from poor flowability, which may further deteriorate over time, and impairs the efficiency of the stereolithographic processes. The present disclosure describes additive manufacturing powders having improved physical characteristics such as flowability and tap density, which are less sensitive or insensitive to ambient humidity. For example, there is described a powder that includes spherical particles having a particle size distribution of less than 1000 micrometers and having a measurable flowability as determined in accordance with ASTM B213 at 75% relative humidity. Dans des opérations de fabrication additive, des poudres utilisées dans des procédés stéréolithographiques doivent être étalées avec précision de manière uniforme à chaque passage du procédé stéréolithographique pour garantir la prévisibilité de la morphologie de la surface de la poudre. Ceci est habituellement difficile à obtenir avec les poudres classiques car ces poudres souffrent souvent d'une mauvaise aptitude à l'écoulement, qui peut en outre se dégrader au fil du temps, et qui altère l'efficacité des procédés stéréolithographiques. La présente invention concerne des poudres de fabrication additive présentant des caractéristiques physiques améliorées telles que l'aptitude à l'écoulement et la densité tassée, qui sont moins sensibles voire insensibles à l'humidité ambiante. Par exemple, l'invention concerne une poudre qui comprend des particules sphériques ayant une distribution granulométrique inférieure à 1000 micromètres et ayant une aptitude à l'écoulement mesurable lorsqu'elle est déterminée conformément à l'ASTM B213 à 75 % d'humidité relative.