Neodymium Magnet
Neodymium magnet, also known as NdFeB magnet, is a tetragonal crystal system formed by Neodymium, iron, and boron (Nd2Fe14B).In 1982, sumitomo's special metal misaki sagawa discovered neodymium magnets.The magnetic energy product (BHmax) of this magnet was greater than that of samarium cobalt magnet, which was the largest magnetic energy product in the world at that time.Subsequently, sumitomo specialty metals successfully developed the powder metallurgy process, and general motors successfully developed the melt-spinning process to produce ndfeb magnets.The magnet is now the second most permanent magnet in magnetism after the absolute zero holmium magnet, and the most commonly used rare earth magnet.Ndfeb magnets are widely used in electronics such as hard drives, mobile phones, earphones and battery-powered tools.
In order to avoid the damage caused by corrosion, protective treatment should be done on the surface of permanent magnetic materials, such as electroplating with gold, nickel, zinc and tin, and surface spraying with epoxy resin.
Ndfeb is divided into two kinds: sintered ndfeb and bonded ndfeb.And sintered ndfeb due to easy corrosion, surface coating, generally galvanized, nickel, environmental protection zinc, environmental protection nickel, nickel copper nickel, environmental protection nickel copper nickel.And sintered ndfeb is generally divided into axial magnetization and radial magnetization, according to the required working face to determine.
Surface treatment of ndfeb:
With a sintered ndfeb Japan, Germany, the European Union in the patent technologies such as the thawing, our country each big sintering factory of collaborative efforts, sintered ndfeb improve the product grade. As a high-tech applications for its comprehensive performance of the constantly improve, the requirements of the surface treatment of sintered ndfeb also greatly increased, the traditional processing method has been unable to meet the requirements of industrial progress. Electronic science and technology university, sichuan, jiaotong university, red rice and other scientific research institutions, from the microscopic molecular structure, essentially perfect surface treatment principle and industrial application technology development, after four years of Hard work and key technology Breakthrough. Nanometer (3010) chelate thin film coating processing, the technology is original technology, nano membrane layer contains the active group has a strong resistance to moisture and oxygen, chloride (Cl), carbon dioxide (co2), etc. Corrosion resistance and organic resin bonding ability greatly increased performance. Its excellent surface physical and chemical properties will have a significant impact on applications.
With excellent magnetic properties, it is widely used in the fields of electronics, power machinery, medical equipment, toys, packaging, hardware machinery, aerospace and aviation, etc. The more common are permanent magnet motors, loudspeakers, magnetic separators, computer disk drives, magnetic resonance imaging equipment and instruments.
