At present, the leading product of rare earth permanent magnet materials is neodymium iron boron, but from the current technical development needs, neodymium iron boron also has certain limitations. In general, magnets fall into two categories: sintered magnets and bonded magnets. NdFeB sintered magnets are anisotropic and are full density magnets, which are increasingly used. The NdFeB bonded magnet is isotropic, and the defects of NdFeB bonded magnets are increasingly prominent. First, the magnetic powder is isotropic, and the maximum magnetic energy is not more than 16MGOe. Secondly, the molding process has certain limitations. : NdFeB quenched magnetic powder is mainly used to make compression bonded magnets, and its output only accounts for 3% of the total bonded magnet production. With the development trend of miniaturization of electrical appliances, the development of bonded magnets with high magnetic energy products has become a new demand direction in the market.

The production and application of bonded NdFeB permanent magnet materials are late, the application is not wide, and the dosage is small. It is mainly used in office automation equipment, Denso machinery, audio-visual equipment, instrumentation, small motors and metering machinery. In recent years, the application ratio of bonded NdFeB permanent magnet materials in China is 62% for computers, 7% for electronics industry, 8% for office automation equipment, 7% for automobiles, 7% for appliances, and 9% for others.

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