NdFeB magnets, as the third generation of rare earth permanent magnets, have very high performance. They are widely used in energy, transportation, machinery, medical, IT, household appliances and other industries. Especially with the development of knowledge economy represented by information technology, they bring new uses to the rare earth permanent magnet NdFeB industry and other functional materials, which brings new uses to NdFeB industry. Boron industry brings a broader market prospect.
NdFeB magnets are tetragonal crystals of neodymium, iron and boron (Nd2Fe14B). In 1982, Masato Sagawa, Sumitomo's special metal, discovered neodymium magnets. The magnetic energy product (BHmax) of this magnet is larger than that of samarium cobalt magnet, which is the largest magnetic energy product in the world. Later, Sumitomo developed powder metallurgy process for special metals, and GM developed melt-spinning process for preparing NdFeB magnets. This magnet is the most powerful permanent magnet nowadays. It is also the most commonly used rare earth magnet. It is 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 the permanent magnet material, such as electroplating with gold, nickel, zinc and tin, and spraying epoxy resin on the surface.