Views: 0 Author: Site Editor Publish Time: 2023-01-18 Origin: Site
Neodymium magnets can be used as compasses, electromagnetic relays, generators and motors or magnets. The application of neodymium magnets in traditional industries is mainly used in motors and can also be used as speakers, and in general speakers can be used. For more information about the neodymium magnets, please read the following words.
What are the performance characteristics of neodymium magnets?
What are the performance advantages of neodymium magnets?
What is the manufacturing method of neodymium magnets?
The strength of neodymium magnets is the result of several factors. Most importantly, the tetragonal Nd2Fe14B crystal structure exhibits a very high uniaxial magnetic crystal anisotropy (HA ≈ 7 T – magnetic field strength H in A/m and magnetic moment in A-m2). This means that the crystals of this material are preferably magnetized along a certain crystal axis, but hardly in other directions. Nd magnetic alloys, like other magnets, consist of micro grains that are aligned in a strong magnetic field during the manufacturing process so that their magnetic axes all point in the same direction. The resistance of the grid to change its magnetization direction gives the connection a very high coercive field strength or resistance to demagnetization.
The neodymium atom can have a large magnetic dipole moment because it has 4 unpaired electrons in its electronic structure, while it is in iron (on average) 3. In magnets, it is the unpaired electrons that are aligned so that their spins are inside in the same direction, creating a magnetic field. This gives the Nd2Fe14B compound a high saturation magnetization strength (Js ≈ 1.6 T or 16 kG) and a typical residual magnetization strength of 1.3 Tesla. Therefore, this magnetic phase has the potential to store large amounts of magnetic energy (BHmax ≈ 512 kJ/m3 or 64 MG-Oe), as the maximum energy density is proportional to Js2.
There are two main methods of producing neodymium magnets.
Classical powder metallurgy or sintered magnetic process
Sintered neodymium magnets are made by melting the raw material in an oven, casting it into a mold and cooling it into bars. The bars are broken and ground; the powder is then sintered into dense blocks. These blocks are then heat treated, cut into shape, surface treated and magnetized.
Faster solidification or bonded magnet process
Bonded Nd magnets are produced by melting and spinning a thin strip of NdFeB alloy. The strip contains randomly oriented Nd2Fe14B grains at nanoscale. The strip is then crushed into pellets, mixed with polymer and compressed or formed into bonded magnets.
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