NdFeB materials contain a large amount of neodymium and iron, which are prone to rust. Therefore, NdFeB magnets must be surface coated. Surface chemical passivation is one of the better solutions at present. NdFeB has extremely high magnetic energy product and coercive force. The advantages of high energy density make NdFeB permanent magnet materials widely used in modern industry and electronic technology, making it possible to make instruments, electroacoustic motors, magnetic separation magnetization miniaturization, light weight, and thin equipment. The advantages of NdFeB are high cost performance and good mechanical properties; the disadvantages are low Curie temperature, poor temperature characteristics, easy powdering and corrosion. It must be improved by adjusting its chemical composition and taking surface treatment methods. , to meet the requirements of practical applications.
Classification:
NdFeB is divided into sintered NdFeB and bonded NdFeB. Bonded NdFeB has all-round magnetism and corrosion resistance; while sintered NdFeB is easy to corrode and requires a coating on the surface. Generally, there are zinc plating, nickel plating, environmentally friendly zinc, environmentally friendly nickel, nickel copper nickel, environmentally friendly nickel copper nickel, etc. Sintered NdFeB is generally divided into axial magnetization and radial magnetization, depending on the working surface required by the material.
Application:
Sintered NdFeB permanent magnet material has excellent magnetic properties and is widely used in electronics, motors, medical equipment, toys, packaging, hardware machinery, aerospace and other fields. The more common ones are permanent magnet motors, speakers, magnetic separators, computer disk drives, magnetic resonance imaging equipment and instruments, etc.
Although the content of boron is small, it plays an important role in the formation of tetragonal intermetallic compounds with high saturation magnetization, high uniaxial anisotropy and high Curie temperature.
