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How Are Strong Magnets Produced?

May. 29, 2020

Permanent Glued Magnet is materials with wide hysteresis loops, high coercive force and high residual magnetism, which can maintain a constant magnetic property once magnetized. Also known as permanent magnetic materials and hard magnetic materials. In application, the permanent magnet works in the demagnetization part of the second quadrant of the magnetic loop after deep magnetic saturation and magnetization. The permanent magnet should have the highest possible coercive force Hc, residual magnetism Br and maximum magnetic energy product (BH) m to ensure the storage of maximum magnetic energy and stable magnetic properties.

The Template Magnet Manufacturer points out two categories of permanent magnets. The first category is alloy permanent magnet materials, including rare earth permanent magnet materials (neodymium iron boron Nd2Fe14B), samarium cobalt (SmCo), aluminum nickel cobalt (AlNiCo). The second category is ferrite permanent magnet materials (Ferrite). According to the different production processes, they are divided into sintered ferrite, bonded ferrite, and injection ferrite. These three processes are divided into isotropic and anisotropic magnets according to the orientation of the magnetic crystal.

These are the main permanent magnet materials currently on the market, and some are eliminated due to the original production process or cost reasons, and cannot be widely used, such as Cu-Ni-Fe (copper nickel-iron), Fe-Co-Mo (iron cobalt molybdenum ), Fe-Co-V (iron cobalt vanadium), MnBi (manganese bismuth).

Rare earth permanent magnet materials (Neodymium Bar Magnets): divided into the following three according to different production processes. Sintered NdFeB-Sintered NdFeB permanent magnet is smelted by air milling powder, the coercive force value is very high, and has extremely high magnetic properties, its maximum magnetic energy product (BHmax) is higher than Ferrite (Ferrite) more than 10 times. Its own mechanical properties are also quite good, it can cut and process different shapes and drill holes. The maximum operating temperature of high-performance products can reach 200 degrees Celsius. Because its substance content easily leads to corrosion, the surface must be treated with different coatings according to different requirements. (Such as zinc plating, nickel, environmental protection zinc, environmental protection nickel, nickel copper nickel, environmental protection nickel copper nickel, etc.). Very hard and brittle, with high resistance to demagnetization, high cost / performance ratio, not suitable for high operating temperatures (> 200 ° C).

Countersunk Hole Pot Magnet of NdFeB

Countersunk Hole Pot Magnet of NdFeB

Bonded NdFeB (Bonded NdFeB) —— Bonded NdFeB is a mixture of NdFeB powder and resin, plastic or low melting point metal binder, and then made by compression, extrusion or injection molding Composite type NdFeB permanent magnet. The product is formed in one time, without secondary processing, and can be directly made into various complex shapes. The bonded NdFeB has magnetism in all directions and can be processed into NdFeB compression molds and injection molds. High precision, excellent magnetic properties, good corrosion resistance, and good temperature stability.

Injection-molded NdFeB (Zhusu NdFeB)-with extremely high accuracy, it is easy to make thin-walled rings or thin magnets with complex anisotropic shapes.

Permanent magnets are widely used in various fields such as electronic, electrical, mechanical, transportation, medical, and daily necessities. Such as the permanent magnets of speakers and telephone receivers; the magnetic system of magnetoelectric meters; the magnetic poles in generators and permanent magnet motors; the permanent magnet devices used in machine manufacturing (such as the permanent magnet chucks of surface grinders, etc.) and the magnetic levitation system and magnetic bearings ; Magnetic separation system, magnetic beneficiation, magnetic water purification system, magnetron, magnetic system of proton accelerator, etc.

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