The introduction of the neodymium magnet


Neodymium magnet, also known as NdFeB magnet, is a tetragonal crystal formed by neodymium, iron and boron (Nd2Fe14B). In 1982, Sumitomo Sasakawa, a special metal, discovered neodymium magnets. The magnetic energy product (BHmax) of this magnet was greater than that of samarium cobalt magnet, which was the largest material in the world at that time. Later, Sumitomo special metals successfully developed the powder metallurgy process, and GM successfully developed the melt spinning process, which can prepare Nd-Fe-B magnets. This kind of magnet is a permanent magnet with magnetism second only to absolute zero holmium magnet, and it is also the most commonly used rare earth magnet.Neodymium magnets are widely used in electronic products, such as hard disks, mobile phones, headphones and battery powered tools.

In order to avoid corrosion damage, it is necessary to protect the surface of neodymium magnet, such as electroplating with gold, nickel, zinc and tin, and spraying epoxy resin on the surface.