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Basic knowledge of NdFeB strong magnet

by:Newland     2020-03-08
NdFeB magnet is the latest achievement in the development of rare earth permanent magnet, which is called 'King of magnet' because of its excellent magnetic properties '. Iron-boron magnets are alloys such as iron oxide, iron oxide, etc. Also known as magnetic steel. NdFeB Material contains a large amount of NdFeB and is easy to rust. Therefore, it is necessary to deal with iron-Boron magnets are surface coated. Surface chemical passivation is one of the best solutions at present. Ferroboron has extremely high magnetic energy product and magnetic force, and high energy density has the advantages of being widely used in modern industry and electronic technology, it makes the miniaturization, light weight, thinning, electroacoustic motor, magnetic separation, magnetization and so on of the instrument possible. NdFeB has the advantages of high cost performance and good mechanical properties. Its disadvantages are low Curie temperature, poor temperature characteristics, easy pulverization and corrosion. Its performance must be improved by adjusting its chemical composition and adopting surface treatment methods to meet the requirements of practical application. Classification: iron and boron are divided into two types of sintered Ferroboron and bonded Ferroboron alloys, which are magnetic and corrosion resistant in all directions. Sintered Ferroboron is easy to corrode, the surface needs zinc, nickel, environmentally friendly Zinc, environmentally friendly nickel, nickel-Copper-Nickel, environmentally friendly nickel-Copper-Nickel and the like are coated. Sintered NdFeB is generally divided into axial magnetization and radial magnetization according to the required working face. Chemical composition: Ferroboron permanent magnet material is a permanent magnet material based on intermetallic compound RE2Fe14B. The main components are rare earth, iron and boron. In order to obtain different properties, cobalt (Co), Aluminum (Al) Other rare earth metals can replace rare earth, and cobalt (Co), Aluminum (Al) Other metal parts replace iron, but play an important role in forming intermetallic compounds with tetragonal crystal structure, and the compound has high saturation magnetization, high uniaxial anisotropy and high Curie temperature. Brand: each product is divided into multiple brands according to the maximum magnetic energy product. NdFeB magnetic materials are: N35-N52, N35M-N50M, N30H-N48H, N30SH-N45SH, N28UH-N35UH, N28eh-N35eh. Sintered boron permanent magnet materials have excellent magnetic properties and are widely used in electronics, motors, medical devices, toys, packaging, hardware machinery, aerospace and other fields, it is widely used in permanent magnet motors, speakers, magnetic separators, computer disk drives, magnetic resonance imaging equipment and other fields.
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