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2024

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Basic knowledge of NdFeB magnet

NdFeB magnets, as the latest result of the development of rare earth permanent magnet materials, are called "magnetic kings" due to their excellent magnetic properties ". NdFeB magnets are alloys of neodymium, iron oxide, etc. Also known as magnetic steel. NdFeB material contains a large amount of neodymium and iron, easy to rust. Therefore, NdFeB magnets must be treated with surface coating. Surface chemical passivation is one of the best solutions at present. NdFeB has a very high magnetic energy product and force, while the advantages of high energy density make NdFeB permanent magnet materials in modern industry and electronic technology has been widely used, so that instrumentation, electro-acoustic motors, magnetic separation and magnetization of equipment such as miniaturization, light


NdFeB magnets, as the latest result of the development of rare earth permanent magnet materials, are called "magnetic kings" due to their excellent magnetic properties ".

NdFeB magnets are alloys of neodymium, iron oxide, etc. Also known as magnetic steel.

NdFeB material contains a large amount of neodymium and iron, easy to rust. Therefore, NdFeB magnets must be treated with surface coating. Surface chemical passivation is one of the best solutions at present. NdFeB has extremely high magnetic energy product and corrective force. At the same time, the advantages of high energy density make NdFeB permanent magnet materials widely used in modern industry and electronic technology, so that instruments, electroacoustic motors, magnetic separation and magnetization The miniaturization, lightweight and thinning of other equipment become possible. 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 application.

Classification:

NdFeB is divided into two types: sintered NdFeB and bonded NdFeB. The bonded NdFeB has magnetism and corrosion resistance in all directions; while the sintered NdFeB is easy to corrode and needs to be coated on the surface, generally including zinc plating, nickel, environmental protection zinc, environmental protection nickel, nickel copper nickel, environmental protection nickel copper nickel, etc. The sintered NdFeB is generally divided into axial magnetizing and radial magnetizing, depending on the required working surface.

Chemical composition:

NdFeB permanent magnet material is a permanent magnet material based on intermetallic compound RE2FE14B. The main components are rare earth (RE), iron (FE) and 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 it plays an important role in the formation of tetragonal crystal structure intermetallic compounds. The compounds 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 and N28EH-N35EH.

Digital Brand

Brand example: 048021 represents a sintered NdFeB permanent magnet material with (BH)max of 366~398kj/m3 and Hcj of 800KA/m.

Character Brand

The grade of sintered NdFeB permanent magnet material consists of two magnetic characteristics: the first part is the main name, which consists 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 (in kj/m3) of the maximum magnetic energy product (BH)max of the material. The third part is the number after the oblique line, one tenth of the magnetic polarization coercivity value (in kA/m), rounded off.

Brand example: NdFeb380/80 represents a sintered NdFeB permanent magnet material with (BH)max of 366~398kj/m3 and Hcj of 800KA/MR.

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 meters, etc.

Medical Role:

NdFeB permanent magnets are high-tech materials for national 863 engineering projects. What he can produce is a biological magnetic field that simulates the characteristics of the human body, and its performance is stable! Acting on the human body can correct the magnetic field of the human body itself, and by enhancing the biological electromagnetic energy of the human meridian, promote the operation of the meridian, so as to achieve the channel, increase the blood supply and oxygen supply to the brain, reduce the excitability of the peripheral nerve of the cerebral cortex, and produce the effect of promoting bone and joint tissue metabolism, hypnosis, analgesia, sedation, promoting blood circulation and eliminating anxiety. At present, it is commonly used to treat insomnia, neurasthenia, cervical spondylosis, scapulohumeral periarthritis, lumbar muscle strain, lumbar disc herniation and other bone and joint chronic diseases, as well as the pain and numbness caused by these diseases.

Source: magnet manufacturer Youlian Magnetics www.youliancy.com

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