Abstract:
Ce procédé de fabrication d'un mélange-maître pour moulage de pièces colorées comprend les étapes suivantes : préparation d'un mélange comprenant une poudre inorganique, avantageusement céramique, et un colorant; soumission du mélange à une étape d'atomisation-séchage pour obtenir une poudre atomisée; soumission de ladite poudre atomisée à une étape de préfrittage; mélange de la poudre préfrittée à un liant organique, avantageusement polymérique, pour obtenir le mélange-maître.
Abstract:
An extrusion method and apparatus are described for producing ceramics, glass, glass-ceramics, or composites suitable for use as proppants. The method includes forming one or more green body materials, extruding the green body materials to form a green body extrudate, separating and shaping the green body extrudate into individual green bodies, and sintering the green bodies to form proppants. The apparatus includes a means for forming an intimate mixture of green body materials, means to produce a green body extrudate, means for separating and shaping the green body extrudate into individual green bodies, and means to sinter the green green bodies to form proppants.
Abstract:
The invention relates to a crucible for melting and crystallizing a metal, a semiconductor material, or a metal alloy, wherein a crucible wall of a crucible base body is made at least partially of a crucible material comprising silicon nitride and silicon dioxide at a weight ratio of between about 1:10 and about 1:1 (Si3N4 : SiO2). The invention further relates to a component for a crucible base body of a crucible for melting and crystallizing a metal, a semiconductor material, or a metal alloy, wherein a component segment is made at least partially of a crucible material comprising silicon nitride and silicon dioxide at a weight ratio of between about 1:10 and about 1:1 (Si3N4 : SiO2), and to a method for producing a component for a crucible base of a crucible for melting and crystallizing a metal, a semiconductor material, or a metal alloy, wherein a component segment is formed at least partially of a crucible material comprising silicon nitride and silicon dioxide at a weight ratio of between about 1:10 and about 1:1 (Si3N4 : SiO2).
Abstract:
This invention consists of binders based on a water soluble binder and a metallocene polyethylene (MPE) to use in metal or ceramic powders injection moulding process. Binders are mainly composed by a water soluble binder and a backbone polymer, being able to further comprise a lubricant and a dispersant. These binders allow the use of water immersion as a method of debinding, so that they are extracted out from the moulded parts by dissolution, characterised in that it is a simple method having a low environmental and health impact. The production process comprises three stages: the phased addition and melting of the constituents of the binder, the mixture of molten constituents in stationary conditions of temperature and speed of agitation and mixture cooling until solidification. The present invention is applied to the injection moulding industry, but preferred to the production of metal or ceramic components.
Abstract:
The invention concerns an unwrought refractory composition, in particular for producing glass furnace hearths, characterized in that it comprises a base mixture comprising in wt. %: 1 to 6 % of a hydraulic cement, and 94 to 99 % of particles of at least a refractory material mainly consisting of alumina (Al2O3), zirconia (ZrO2) and silica (SiO2), the fraction of the particles of said base mixture having a size less than 40 µm being distributed in wt. % relative to the weight of said base mixture, as follows: fraction = 4 %; fraction = 5 %; fraction = 16 %; fraction
Abstract:
A particulate sealant for forming plugs in selected cells of honeycomb structures and consisting essentially, by weight of about 70 to 90 % ceramic blend, the ceramic blend being raw ceramic materials selected from a composition consisting essentially of in percent by weight about 12 to 16 % MgO, about 33 to 38 % Al 2 O 3 , and about 49 to 54 % SiO 2 , which will form cordierite (2MgO×2Al 2 O 3 ×5SiO 2 ) on firing, and about 10 to 30 % binder system comprising a thermoplastic polymer capable of forming gel or thermosetting resin.
Abstract translation:一种用于在蜂窝结构的选定细胞中形成塞子的颗粒密封剂,其主要由约70至90%的陶瓷共混物的重量组成,所述陶瓷共混物是选自基本上按重量百分比计约12至16% MgO,约33至38%的Al 2 O 3和约49至54%的SiO 2,其在烧制时将形成堇青石(2MgO 2 Al 2 O x x SiO 2);以及约10至30%的包含能够形成凝胶或热固性树脂的热塑性聚合物的粘合剂体系。
Abstract:
L'invention concerne une composition réfractaire non façonnée, destinée notamment à la réalisation de soles d'un four de verrerie, remarquable en ce qu'elle comprend un mélange de base comportant, en pourcentage en poids, 1 à 6% d'un ciment hydraulique, et 94 à 99% de particules d'au moins un matériau réfractaire dont les constituants principaux sont l'alumine (Al 2 O 3 ), la zircone (ZrO 2 ) et la silice (SiO 2 ),la fraction des particules dudit mélange de base ayant une grosseur inférieure à 40 µm étant distribuée, en pourcentage en poids par rapport au poids dudit mélange de base, de la manière suivante : - fraction
Abstract:
A binder system for use in the formation of ceramic or other powder-formed greenware comprising a binder, a solvent for the binder, a surfactant, and a component that is non-solvent with respect to the binder and solvent. The non-solvent component exhibits a lower viscosity than the solvent when containing the binder and comprises at least a portion of a branched chain paraffin exhibiting a 90 % recovered distillation temperature ranging between 205 DEG C to about 225 DEG C and a carbon chain length comprised predominantly of carbon chain distributions ranging from 12 to 14. Also disclosed is a process of forming and shaping plasticized powder mixtures and a process for forming ceramic articles utilizing the binder system.
Abstract:
Provided is a powder and binder system for manufacturing sintered parts from particulate material, and a method of injection molding parts for sintering. The particulate material includes ceramic, metallic and intermetallic powders. Preferably, selected powder particles are coated with one or more additives (19, 21 and 23) depending on their shape and surface chemistry to create a powder system. The additives may include antioxidants, coupling agents, surfactants, elasticizing agents, dispersants, plasticizer/compatibilizers and lubricants. The surface active additives are designed to improve the interface between the powder and the binder. The powder system may be mixed or compounded with a binder system in an inert atmosphere to form a powder and binder system, or feedstock, for powder molding. The binder system may contain one or more components which are removed prior to sintering the powder. The powder and binder system may also be molded about an expendable core which is extracted prior to sintering.