Abstract:
A method for producing a bonded permanent magnet, comprising: (i) incorporating a solid precursor material comprising a thermoplastic crosslinkable polymer and magnetic particles into an additive manufacturing device, wherein the crosslinkable polymer has a delayed crosslinking ability; (ii) melting the precursor material by heating it to a temperature of at least and no more than 10C above its glass transition temperature; (iii) extruding the melt through the additive manufacturing device and, as the extrudate exits from the nozzle and is deposited on a substrate as a solidified preform of a desired shape, exposing the resultant extrudate to a directional magnetic field of sufficient strength to align the magnetic particles; and (iv) curing the solidified preform by subjecting it to conditions that result in crosslinking of the thermoplastic crosslinkable polymer to convert it to a crosslinked thermoset. The resulting bonded permanent magnet and articles made thereof are also described.
Abstract:
Techniques are disclosed for milling an iron-containing raw material in the presence of a nitrogen source to generate anisotropically shaped particles that include iron nitride and have an aspect ratio of at least 1.4. Techniques for nitridizing an anisotropic particle including iron, and annealing an anisotropic particle including iron nitride to form at least one a''-Fe16N2 phase domain within the anisotropic particle including iron nitride also are disclosed. In addition, techniques for aligning and joining anisotropic particles to form a bulk material including iron nitride, such as a bulk permanent magnet including at least one a''-Fe16N2 phase domain, are described. Milling apparatuses utilizing elongated bars, an electric field, and a magnetic field also are disclosed..
Abstract translation:公开了在氮源存在下研磨含铁原料以产生包括氮化铁并具有至少1.4的纵横比的各向异性形状的颗粒的技术。 公开了包括铁的各向异性粒子的氮化和包括氮化铁在内的各向异性粒子退火以在包括氮化铁的各向异性粒子内形成至少一个“Fe 16 N 2”相域的技术。 此外,描述了用于对准和连接各向异性粒子以形成包括氮化铁的体材料的技术,例如包括至少一个“Fe 16 N 2”相域的体积永久磁体。 还公开了利用细长条,电场和磁场的铣削装置。
Abstract:
A method of making a magnetically loaded pre-impregnated tape uses a drum (1) that is heated and which is associated with a heated bath (2) containing a thermo-plastic resin solution. A fibre tape material (4) is fed onto the drum (1) and, just prior to the fibre tape material meeting the periphery of the drum, the fibre tape material (4) is impregnated with an isotropic magnetic particle material (6) to form the pre-impregnated tape (8). The pre-impregnated tape may be fed to a heating station where it is bonded with a thermoplastic resin impregnated fibre tow to produce a magnetically loaded composite tape.
Abstract:
A method of making a magnetically loaded pre-impregnated tape uses a drum (1) that is heated and which is associated with a heated bath (2) containing a thermo-plastic resin solution. A fibre tape material (4) is fed onto the drum (1) and, just prior to the fibre tape material meeting the periphery of the drum, the fibre tape material (4) is impregnated with an isotropic magnetic particle material (6) to form the pre-impregnated tape (8). The pre-impregnated tape may be fed to a heating station where it is bonded with a thermoplastic resin impregnated fibre tow to produce a magnetically loaded composite tape.
Abstract:
Die Erfindung betrifft ein Verfahren zur Herstellung eines Magnets (1), wobei der Magnet (1) zumindest aus einem Magnetwerkstoff (3) und einem Bindemittel (4) geformt und anschließend ausgehärtet ist. Dabei ist vorgesehen, dass dem Bindemittel (4) während des Aushärtens ein chemisch an den Magnetwerkstoff (3) gebundenes Metalloxid (8) erzeugt wird. Die Erfindung betrifft weiterhin einen Magnet (1) sowie eine elektrische Maschine.