NdFeB Magnetic Material is Called “Magnetic King”
NdFeB magnetic material, as the latest result of the development of rare earth permanent magnet materials, is called “Magnetic King” due to its excellent magnetic properties.
NdFeB magnetic materials are alloys of neodymium, iron oxide, etc. Also called magnet.
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 a very high magnetic energy product and coercive force, and at the same time, the advantages of high energy density make NdFeB permanent magnet materials widely used in modern industry and electronic technology, thus making instruments, electroacoustic motors, magnetic separation magnetization It is possible to reduce the size, weight, and thickness of other equipment. The advantages of NdFeB are high cost performance and good mechanical properties; the disadvantage is that the Curie temperature point is low, the temperature characteristics are poor, and it is easy to be pulverized and corroded. It must be improved by adjusting its chemical composition and adopting surface treatment methods. , in order to meet the requirements of practical applications.
NdFeB is divided into two types: sintered NdFeB and bonded NdFeB. Bonded NdFeB has magnetism in all directions and is corrosion-resistant; while sintered NdFeB is easy to corrode, and the surface needs to be coated, generally galvanized, Nickel, environmental protection zinc, environmental protection nickel, nickel copper nickel, environmental protection nickel copper nickel, etc. Sintered NdFeB is generally divided into axial magnetization and radial magnetization, which are determined according to the required working surface.
The 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, 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.
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.
Brand example: 048021 means (BH) max is 366~398kj/m3, Hcj is 800KA/m sintered NdFeB permanent magnet material.
The grade of sintered NdFeB permanent magnet material consists of three parts: the main name and two kinds of magnetic properties. The first part is the main name, which is composed of the chemical symbol ND of neodymium element, the chemical symbol FE of iron element and the chemical symbol B of boron element. The second part is the number before the line, which is the nominal value of the maximum magnetic energy product (BH) max of the material (unit is kj/m3), the third part is the number after the slash, the magnetic polarization coercivity value (unit is KA /m), the value is rounded to the nearest integer.
Example of grade: NdFeb380/80 means (BH) max is 366~398kj/m3, Hcj is 800KA/MR sintered NdFeB permanent magnet material. Magnetic King
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 meters, etc. Magnetic King
NdFeB permanent magnets are high-tech materials of the National 863 Project. What he can generate is a biomagnetic field that simulates the characteristics of the human body’s magnetic field, with stable performance! Acting on the human body can correct the magnetic field of the human body itself, and promote the operation of meridians and qi by enhancing the bio-electromagnetic energy of the human body’s meridians, so as to achieve dredging of the meridians, increase blood supply and oxygen supply to the brain, reduce the excitability of peripheral nerves in the cerebral cortex, and promote bone growth. The effect of joint tissue metabolism, hypnosis, analgesia, sedation, invigorating blood circulation and eliminating anxiety. 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 symptoms such as pain and numbness caused by these diseases.