NdFeB permanent magnet

- Nov 03, 2017 -

Technology definitions

  English name: neodymium-iron- boron permanent magnet

  Definition: rare earth permanent magnet based on Nd2Fe14B intermetallic compound. Has a tetragonal crystal structure, a strong magnetocrystalline anisotropy and high saturation magnetization.


  NdFeB permanent magnet material is based on the intermetallic compound Nd2Fe14B permanent magnet material. Compared with casting Al-Ni-Co permanent magnet material and ferrite permanent magnet material, NdFeB has a very high magnetic energy product and coercive force, can absorb the weight corresponding to 640 times its own weight. The advantages of high energy density make NdFeB permanent magnet materials in the modern industrial and electronic technology has been widely used.

  NdFeB permanent magnet is a kind of neodymium rare earth magnet, also known as the latest results of the development of rare earth permanent magnet materials, due to its excellent magnetic properties and is called "magnetic king." This is the product of the National 863 Hi-Tech project. NdFeB permanent magnet with a very high magnetic energy product and the correction, while the advantages of high energy density NdFeB permanent magnet materials in modern industry, electronic technology and the medical industry has been widely used, so that instrumentation, electricity Sound motor, magnetic separation magnetization, medical equipment, medical equipment and other equipment of small, lightweight, thin possible. Neodymium iron boron permanent magnet has the advantage of cost-effective, with good mechanical properties; inadequacies in the Curie temperature is low, poor temperature characteristics, and easy to powder corrosion, it must be adjusted by chemical composition and surface treatment methods to make it Can be improved in order to achieve the practical application requirements.


strong magnets is divided into two types of sintered NdFeB and bonded NdFeB, bonded NdFeB all directions are magnetic, corrosion-resistant; and sintered NdFeB due to corrosion, the surface to be plated, usually with plating Zinc, nickel, green zinc, green nickel, nickel-copper nickel, nickel-nickel and other environmentally friendly nickel. The sintered NdFeB sub-axial magnetization and radial magnetization, according to the required face to be set.

chemical components

neodymium material is based on the intermetallic compound RE2FE14B based permanent magnet material. The main components of rare earth (RE), iron (FE), boron (B). (R), aluminum (Al) and other metal parts of the alternative, boron content is small, but the use of rare earth ND in order to obtain different properties can be part of dysprosium (Dy), praseodymium (Pr) and other rare earth metals instead of iron But plays an important role in the formation of tetragonal crystalline intermetallic compounds, so that the compound has high saturation magnetization, high uniaxial anisotropy and high Curie temperature.

Common application

rare earth magnets with excellent magnetic properties, widely used in electronics, electrical machinery, medical equipment, toys, packaging, hardware machinery, aerospace and other fields, the more common are permanent magnet motor, speaker, magnetic separator, computer disk Drive, magnetic resonance imaging equipment and meters.

Medical application

NdFeB magnet is a national 863 project planning high-tech materials. He can produce is a simulation of the magnetic field characteristics of the biological magnetic field, stable performance! Acting on the human body to correct the magnetic field of the human body itself, and by enhancing the biological electromagnetic energy of the body meridian, massage many body acupuncture points to promote the qi operation, so as to pass through the meridians, increase blood supply to the brain to promote hair follicle regeneration recovery, Reduce the excitability of the peripheral nerve of the cerebral cortex, resulting in the promotion of bone and joint tissue metabolism, hypnosis, analgesic, sedation, blood circulation and eliminate anxiety effects. Currently the domestic medical industry is often used to treat hair loss, insomnia, neurasthenia, cervical spondylosis, frozen shoulder, lumbar muscle strain, lumbar disc herniation and other chronic diseases of bone and joint.

Article from NdFeB Industry Network

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