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Magnet process flow
Time： 2023-03-17
Process sequence: batching, smelting, forming, sintering, surface processing, precision processing, electroplating
Classified according to different production processes
Sintered ferrite, bonded ferrite, and injection molded ferrite are divided into isotropic and heterogonal magnets based on the different orientations of magnetic crystals.
These are the main permanent magnet materials currently on the market, and there are also some that cannot be widely applied due to production process or cost reasons and are eliminated, such as Cu Ni Fe (copper nickel iron), Fe Co Mo (iron cobalt molybdenum), Fe Co V (iron cobalt vanadium), MnBi (manganese bismuth)
The production processes are divided into the following three types
Bonded NdFeB
——Bonded neodymium iron boron is a composite neodymium iron boron permanent magnet made by uniformly mixing neodymium iron boron powder with adhesives such as resins, plastics, or low melting point metals, and then using compression, extrusion, or injection molding methods. The product is formed in one go without the need for secondary processing and can be directly made into various complex shapes. Bonded neodymium iron boron has magnetism in all directions and can be processed into neodymium iron boron compression molds and injection molds. High precision, excellent magnetic properties, good corrosion resistance, and good temperature stability.
Sintered NdFeB
——Sintered neodymium iron boron permanent magnets are made by smelting after airflow milling, with high coercivity and extremely high magnetic properties. Their maximum magnetic energy product (BHmax) is more than 10 times higher than that of ferrite. Its mechanical properties are also quite good, and it can cut and process different shapes and drill holes. The maximum operating temperature of high-performance products can reach 200 ℃.
Due to its material content, which can easily lead to corrosion, different coating treatments must be applied to the surface according to different requirements. (such as zinc plating, nickel, environmentally friendly zinc, environmentally friendly nickel, nickel copper nickel, environmentally friendly nickel copper nickel, etc.). Very hard and brittle, with high resistance to demagnetization, high cost/performance ratio, not suitable for high working temperatures (>200 ℃).
Injection molded neodymium iron boron (Zhusu NdFeB)
——Has extremely high accuracy and is easy to make thin-walled rings or thin magnets with complex anisotropic shapes
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