Metro Aimante Neodymium Magnets Export

Metro Aimante  Neodymium  Magnets

There are two principal Neodymium magnet manufacturing routes:

• The classical powder metallurgy or sintered magnet process
• The rapid solidification or bonded magnet process

Sintered Nd-magnets are prepared by the raw materials being melted in a furnace, cast into a mold and cooled to form ingots. The ingots are pulverized and milled to tiny particles. This undergoes a process of liquid-phase sintering whereby the powder is magnetically aligned into dense blocks which are then heat-treated, cut to shape, surface treated and magnetized. Currently between 45,000 and 50,00  Ton of sintered neodymium magnets are produced each year, mainly in China and Japan. As of 2011^[update], China produces more than 95% of rare earth elements, and produces 76% of the world's total rare earth magnets.

Bonded Nd-magnets are prepared by a thin ribbon of the Nd-Fe-B alloy. The ribbon contains randomly oriented Nd₂Fe₁₄B Nano-scale grains. This ribbon is then pulverized into particles, injection molded into bonded magnets. Bonded magnets offer less flux than sintered magnets but can be net-shape formed into intricately shaped parts.                                                                                                                    There are approximately 5,500 tons of Neo bonded magnets produced each year. In addition, it is possible to hot-press the melt spun Nano crystalline particles into fully dense isotropic magnets, and then upset-forge/back-extrude these into high-energy anisotropic magnets.

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