NdFeB material contains a lot of neodymium and iron, which is easy to rust. Therefore, NdFeB magnets must be surface-coated. Surface chemical passivation is one of the best solutions at present. NdFeB has extremely high magnetic energy product and coercive force, and the advantages of high energy density make NdFeB permanent magnet materials widely used in modern industry and electronic technology, so that instruments and meters, electroacoustic motors, magnetic separation and magnetization Miniaturization, light weight, and thinning of equipment such as equipment become possible. The advantages of NdFeB are high cost performance and good mechanical properties; the disadvantages are that the Curie temperature is low, the temperature characteristics are poor, and it is easy to pulverize and corrode. It must be improved by adjusting its chemical composition and taking surface treatment methods. , in order to meet the requirements of practical applications.

Classification:

NdFeB is divided into sintered NdFeB and bonded NdFeB. Bonded NdFeB is magnetic in all directions and is corrosion-resistant; and sintered NdFeB is easy to corrode, and the surface needs to be coated. Generally, there are galvanized, Nickel, environment-friendly zinc, environment-friendly nickel, nickel-copper-nickel, environment-friendly nickel-copper-nickel, etc. Sintered NdFeB is generally divided into axial magnetization and radial magnetization, depending on the required working surface.

chemical composition:

NdFeB permanent magnet material is a permanent magnet material based on the intermetallic compound RE2FE14B. The main components are rare earth (RE), iron (FE), boron (B). Among them, the rare earth ND can be partially replaced by other rare earth metals such as dysprosium (Dy) and praseodymium (Pr) in order to obtain different properties. Iron can also be partially replaced by other metals such as cobalt (Co) and aluminum (Al). The content of boron is small, but However, it plays an important role in the formation of tetragonal crystal structure intermetallic compounds, which have high saturation magnetization, high uniaxial anisotropy and high Curie temperature.

Grade:

Each type of product is divided into several grades according to the maximum magnetic energy product. The grades of NdFeB magnetic materials are: N35—N52, N35M—N50M, N30H—N48H, N30SH—N45SH, N28UH—N35UH, N28EH—N35EH.

Application:

Sintered NdFeB permanent magnet materials have excellent magnetic properties and are widely used in electronics, electrical machinery, 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 instruments, etc.

Medical effect:

NdFeB permanent magnet is a high-tech material of the national 863 project plan. What he can produce is a biomagnetic field that simulates the characteristics of the human body's magnetic field, and its performance is stable! Acting on the human body, it can correct the magnetic field of the human body itself, and by enhancing the bio-electromagnetic energy of the meridians of the human body, it can promote the operation of the meridians, so as to achieve dredging of the meridians, increase blood supply and oxygen supply to the brain, reduce the excitability of the peripheral nerves of the cerebral cortex, and promote bone health. The effects of joint tissue metabolism, hypnosis, analgesia, sedation, blood circulation and anxiety relief. At present, it is commonly used to treat insomnia, neurasthenia, cervical spondylosis, frozen shoulder, lumbar muscle strain, lumbar disc herniation and other chronic bone and joint diseases, as well as pain, numbness and other symptoms caused by these diseases.