As the third generation of rare earth permanent magnet materials, NdFeB magnets have high performance, which are widely used in energy, transportation, machinery, medical, IT, home appliances and other industries, especially with the development of the knowledge economy represented by information technology, which brings new uses to functional materials such as rare earth permanent magnet NdFeB industry, which brings broader market prospects for NdFeB industry.
NdFeB magnets are tetragonal crystals formed by neodymium, iron, and boron (Nd2Fe14B). In 1982, Masato Sagawa of Sumitomo Special Metals discovered neodymium magnets. The magnetic energy product (BHmax) of this magnet is greater than that of samarium cobalt magnets, and it is the substance with the largest magnetic energy product in the world. Later, Sumitomo Special Metals successfully developed the powder metallurgy process, and General Motors developed the successful melt-spinning process, which was able to prepare NdFeB magnets. [25] This magnet is the most magnetic permanent magnet available today and the most commonly used rare earth magnet and is widely used in electronics such as hard drives, 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, tin, and spraying epoxy resin on the surface.