At present, magnetic materials are mainly divided into permanent magnet materials and soft magnets. The magnetism of permanent magnet materials can be permanently preserved, mainly including alloy permanent magnet materials represented by neodymium iron boron and ferrite permanent magnet materials.
The magnetism of soft magnets can be magnetized by external action, but the magnetism is also easy to disappear.
Neodymium iron boron (NdFeB) is a third-generation rare earth permanent magnet material, mainly composed of neodymium, iron, and boron. Among them, neodymium accounts for 25% to 35%, iron accounts for 65% to 75%, and boron It accounts for about 1%. NdFeB has the advantages of high remanence, high coercivity and high magnetic energy product, and is by far the strongest magnetic material in permanent magnetic materials.
Compared with ferrite, NdFeB has a higher magnetic energy product, and at the same time its stability is stronger and its magnetic force is more controllable.
With the continuous development of the global new energy automobile and robot industry, injection molded NdFeB is expected to become the main development direction of magnetic materials in the future.
According to the production process, NdFeB can be divided into sintered NdFeB and bonded NdFeB. Sintered NdFeB adopts powder metallurgy technology. The alloy after smelting is made into powder and pressed in a magnetic field; NdFeB is made of NdFeB magnetic powder and resin through injection molding after extruding and granulating. Compared with sintered NdFeB, bonded NdFeB has better corrosion resistance, can be processed into products of various shapes, low energy consumption and suitable for mass production.