Abstract:
The present disclosure provides three-dimensional (3D) objects, 3D printing processes, as well as methods, apparatuses, non-transitory computer readable medium, and systems for the production of a 3D object utilizing a material-fall directed towards a target surface.
Abstract:
Die vorliegende Erfindung betrifft ein Verfahren zum Herstellen eines Siliziumcarbidenthaltenden Körpers (100), dadurch gekennzeichnet, das Verfahren die Verfahrensschritte aufweist: a) Bereitstellen eines Gemisches (16) mit einer Siliziumquelle und einer Kohlenstoffquelle, wobei die Siliziumquelle und die Kohlenstoffquelle gemeinsam in Partikeln eines Feststoffgranulats vorliegen; b) Anordnen einer Schicht des bei Verfahrensschritt a) bereitgestellten Gemisches (16) auf einem Träger (12), wobei die Schicht des Gemisches (16) eine vordefinierte Dicke aufweist; und c) Lokal begrenztes Behandeln des in Verfahrensschritt b) angeordneten Gemisches (16) mit einer Temperatur in einem Bereich von ≥ 1400°C bis ≤ 2000°C nach einem vorbestimmten räumlichen Muster, wobei das vorbestimmte räumliche Muster ausgewählt ist basierend auf der räumlichen Ausgestaltung des zu erzeugenden Körpers (100). Ein derartiges Verfahren erlaubt ein einfaches und kostengünstiges Erzeugen auch komplexer Strukturen aus Siliziumcarbid.
Abstract:
The invention relates to a process for rapid manufacturing of parts made of a metallic, intermetallic or ceramic material, made of a ceramic matrix composite or made of a metal matrix composite with discontinuous reinforcement, especially with ceramic or intermetallic reinforcement, by melting or sintering particles of powder(s) using a high-energy beam. Characteristically, the powder used is a single powder, the particles of which have a sphericity of between 0.8 and 1.0 and a shape factor of between 1 and √2, each powder particle having a substantially identical mean composition and the particle size distribution of the particles of said powder is narrowed about the mean diameter d50% value so that: (d90% - d50%) / d50% ≤ 0.66 and (d50% - d10%) / d50% ≤ 0.33 with a "span" (d90% - d10%) / d50 % ≤ 1.00. Application to the rapid manufacturing of parts by selective laser melting (SLM) or by selective laser sintering (SLS) or else by direct metal deposition (DMD). Such powders are adapted to the targeted process/material pair.
Abstract:
A ceramic turbine component is formed by a process including mixing a ceramic powder with an inorganic binder powder. The powder mixture is then formed into a turbine component that is subsequently densified by transient liquid phase sintering. In an embodiment, the turbine component may be formed by an additive manufacturing process such as selective laser sintering.
Abstract:
The invention relates to a process for rapid manufacturing of parts made of a metallic, intermetallic or ceramic material, made of a ceramic matrix composite or made of a metal matrix composite with discontinuous reinforcement, especially with ceramic or intermetallic reinforcement, by melting or sintering particles of powder(s) using a high-energy beam. Characteristically, the powder used is a single powder, the particles of which have a sphericity of between 0.8 and 1.0 and a shape factor of between 1 and √2, each powder particle having a substantially identical mean composition and the particle size distribution of the particles of said powder is narrowed about the mean diameter d50% value so that: (d90% - d50%) / d50% ≤ 0.66 and (d50% - d10%) / d50% ≤ 0.33 with a "span" (d90% - d10%) / d50 %
Abstract:
A method of making an object using mold casting, comprising the steps of applying a slip mixture into a mold fabricated by 3D printing or additive manufacturing technique, and firing the mold containing the slip mixture. A composition of a slip mixture for use with a mold fabricated by 3D printing or additive manufacturing technique, the composition comprising calcium aluminate, from 10% to 60% by weight, and a filler. Such method and composition can provide efficient and economically viable ways of fabricating objects having complex shapes and high density.
Abstract:
The invention relates to remotely operated laser sintering systems and methods for manufacturing pellets containing highly radioactive elements. The highly radioactive elements can be recovered from used nuclear fuels. The systems and methods of the invention employ a feed composition including one or more highly radioactive elements and a ceramic matrix material. The feed composition is distributed in the form of a layer and sintered by directing at least one laser beam to form a pattern in the layer of the feed composition. The pattern corresponds to the shape of the pellet. Further, the sintering process can be repeated as necessary to achieve a pre-determined pellet height.
Abstract:
An airfoil includes a body that includes leading and trailing edges joined by spaced apart pressure and suction sides to provide an exterior airfoil surface. A cooling passage is arranged interiorly of the exterior airfoil surface and provides an interior surface. The interior cooling surface includes micro-bumps that protrude from the interior cooling surface into the cooling passage. The micro-bumps are discrete from and noncontiguous relative to one another in multiple directions along the interior cooling surface. The micro-bumps may be provided while forming the airfoil or using correspondingly shaped micro-depressions on an airfoil core.
Abstract:
Mélange céramique de particules comprenant, comme composants, une partie majoritaire en poids de particules frittables en matière céramique et des particules d'au moins un additif, au moins un additif étant une matière solide inorganique dispersée absorbante qui présente, pour un rayonnement laser émettant à une longueur d'ondes prédéterminée, une absorptivité spécifique, supérieure à l'absorptivité des autres composants du mélange céramique, et qui se dégrade brutalement avec émission gazeuse, en présence dudit rayonnement laser, cet additif étant présent en des proportions inférieures à 5 % en poids du mélange sec, et pièces céramiques obtenues à partir d'un tel mélange.
Abstract:
The present invention relates to a process of sintering of metal oxide films, from formulations based on particles of metal oxides, characterized in that it comprises the following steps, in succession: a) adding to the formulation particles or molecules of a compound absorbing the electromagnetic radiation in the regions of visible and/or infrared spectrum that, in consequence of the absorption of the radiation, generates heat; b) mixing until a homogeneous dispersion of the absorbing compound in the formulation is obtained; c) deposition of the formulation in the form of a film on a substrate; d) irradiation of said film with an electromagnetic radiation in the visible and/or infrared regions of the spectrum, to obtain the desired sintering of said particles of metal oxides through the heating produced by said absorbing compound. The invention also relates to a process for the production of photoelectrochemical cells in which the steps of manufacture of the electrode based on metal oxides are carried out according to said sintering process of formulations based on metal oxides and the steps of manufacture of the counter electrode can be performed by a similar procedure.