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, 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.
Metro
Aimante your magnetic supplier and partner
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