Abstract:
An electrically conductive composite material for use in the manufacture of electrical contact components, consisting of a metal strip and a contact layer made of a silver or tin contact material, which contact layer is applied at least to one side of the metal strip, whereby the contact material contains as a first additive 0.5 to 60 weight percentage of carbon powder in the form of fine particles having a diameter of null1null5 to 200 nm and 0.5 to 60 weight percentage of a second powdery additive in the form of fine particles having a diameter of null2null5 to 200 nm. Moreover a device for the gas atomization of a jet of a flowable or liquid material and a method for the manufacture of an electrically conductive composite material and its use are disclosed.
Abstract:
In a method for atomizing metal melts, in which the liquid metal bath is sprayed from a tundish via an outlet opening by the aid of a gas into a cooling chamber, or onto a surface to be coated while compacting the comminuted particles by the aid of a propellant gas, the liquid metal melt via an annular gap is introduced into the outlet opening, into which a hot gas having a temperature of between 250null C. and 1300null C. and a supercritical pressure of between 2 and 30 bars is ejected through a Laval nozzle concentrically with said opening. The hot gas is contacted with the melt bath at a speed exceeding supersonic speed, with a radial outwardly directed component or with a twist. The device for carrying out the method includes a melt tundish (1) and an immersion tube (4) immersed in the melt (2) while forming an annular gap surrounding the outlet opening for the melt (2) and a lance (7) for the ejection of a propellant gas, wherein the height-adjustable lance (7) carries a Laval nozzle (9).
Abstract:
Uniform sized and shaped spheres are formed by applying a minute periodic disturbance to a low viscosity liquid material. Pressure forces the material through at least one orifice in a crucible as a steady laminar stream. The stream enters an enclosed controlled temperature solidification environment which contains at least one heat transfer medium. A charging means is applied to the stream as the stream exits the crucible and breaks into a plurality of spheres to deflect the spheres as they pass through an electric field. The enclosed controlled temperature solidification environment cools and substantially solidifies the spheres.
Abstract:
A method and an apparatus (10) eject on demand a discrete droplet (12) of liquid at a high temperature along a predetermined trajectory (18) by transferring a physical impulse from a low temperature environment to a high temperature environment. The ejector apparatus includes a vessel (26) having an interior (24) that contains a high-temperature liquid (14), such as liquid metal, Al, Zn or Sn. The interior includes an inlet end (30) that receives a thermally insulative impulse transmitting device (22) and a feed supply (34) of the droplet material, and a discharge region (56) having an orifice (16) through which the discrete droplets are ejected. An inert gas is feed through the inlet end and into the vessel to create an overpressure over the liquid so that as the overpressure is increased the droplet size is increased. A heater (70) heats the material contained within the interior. An impulse generator (20) is connected and imparts a physical impulse to the impulse transmitting device to produce an ejection pressure at the orifice to eject a discrete droplet of the high-temperature liquid. The impulse generator including a pulse generator electrically connected to a pulse amplifier that is electrically connected to an acoustic device, such as a loudspeaker.
Abstract:
A gas-atomizing system for spray casting a spray of molten metal on a moving substrate in which the gas atomizing device is in the form of an annulus having a central opening therethrough through which the molten metal to be atomized flows. The annulus is provided with a plenum chamber which communicates with elongated openings on the bottom surface of the annulus. The manifold and outlets are so arranged that a divergent conical spray pattern is produced having a central axis inclined with respect to the vertical axis of the molten metal stream in a direction downstream of the moving substrate upon which the spray material is deposited.
Abstract:
Provided is an integrated device for preparing magnesium hydride powder and a method for preparing magnesium hydride powder. The device comprises a heating chamber for heating a magnesium-based metal material to produce metal droplets; a powder-making chamber comprising an atomizing means used for atomizing the metal droplets which are then cooled to form a metal powder; and a reaction chamber used for performing a hydrogenation reaction on the metal powder to form the magnesium hydride powder. The device is an integrated structure monolithic with a simple structure and a convenient operation; and the entire process of preparing magnesium hydride powder can be completed in this single device and can realize automated control. The preparation method is simple and easy to operate and produces a product that has a moderate size, uniform particles, and excellent performance.
Abstract:
A metal powder production apparatus capable of easily preventing an oxide in a molten metal from entering a liquid nozzle is provided. The metal powder apparatus includes a first crucible heating and melting a melting material to generate molten metal, a first heating device heating and melting the metal in the first crucible, a stopper opening and closing a first opening provided on the bottom surface of the first crucible, an introduction pipe having one end connected to the first opening of the first crucible and leading a molten metal in the first crucible to the outside of the first crucible, a second crucible receiving the molten metal flowing out of the introduction pipe, a second heating device heating the second crucible, and a liquid nozzle provided on the bottom surface of the second crucible.
Abstract:
Devices, systems, and methods are directed to applying magnetohydrodynamic forces to liquid metal to eject liquid metal along a controlled pattern, such as a controlled three-dimensional pattern as part of additive manufacturing of an object. Electric current delivered to a meniscus of the liquid metal in a quiescent state can be directed to exert a pullback force on the liquid metal. The pullback force can be sufficient to draw the liquid metal, in the quiescent state, in a direction toward the nozzle to reduce the likelihood of unintended wetting of surfaces of the nozzle between uses of the nozzle.
Abstract:
Devices, systems, and methods are directed to applying magnetohydrodynamic forces to liquid metal to eject liquid metal from a nozzle along a controlled pattern, such as a controlled three-dimensional pattern as part of additive manufacturing of an object. Electrodes used to deliver electric current across a firing chamber of the nozzle are formed of the same material as the liquid metal being ejected from the nozzle. For example, respective interfaces between the electrodes and the liquid metal can be molten material. Forming the electrodes and the liquid metal of the same material can facilitate, for example, ejecting liquid metals having high melt temperatures.
Abstract:
A printer fabricates an object from a computerized model using a fused filament fabrication process and a metallic build material. A nozzle cleaning fixture may be provided for the printer that is shaped to physically dislodge solidified build material and other contaminants from the nozzle. A robotic system for the printer can be used to maneuver the nozzle into engagement with the nozzle cleaning fixture for periodic cleaning, or in response to a diagnostic condition or the like indicating a clogged nozzle.