High-end Nd-Fe-B magnetic materials are widely used in various motors in automobiles, household appliances, energy, machinery, medical, aerospace and other industries, as well as components that need to produce a strong gap magnetic field. Magnetic materials are closely related to information technology, automation, mechatronics, national defense and national economy, and have irreplaceable advantages in many fields. Magnetic materials generally include iron, cobalt, nickel and their alloys, rare earth elements and their alloys, and some manganese compounds. Magnetic materials can be divided into soft magnetic materials and hard magnetic materials according to the degree of magnetization difficulty. Compared with permanent magnetic materials, soft magnetic materials are easier to magnetize and demagnetize, and their main function is the conversion and transfer of magnetic energy and electromagnetic energy; hard magnetic materials, also known as permanent magnetic materials, can remain stable even after being magnetized by an external magnetic field maintaining one or most of the original magnetization direction under the action of a considerable reverse magnetic field, and have the functions of electrical signal conversion and electrical mechanical energy conversion Neodymium iron boron magnetic materials are widely used in various fields, such as automobile, household appliances, energy, machinery, medical, aerospace and other industries, as well as components that need to produce a strong gap magnetic field.

　　Permanent magnet materials can be divided into three categories: rare earth permanent magnet, ferrite permanent magnet and other permanent magnet materials. Among them, rare earth permanent magnetic materials have developed rapidly since the 1960s. According to the time sequence of development and application, they can be divided into four generations: the first generation is reco5 series materials represented by SmCo5; the second generation is reco17 series magnets represented by Sm2Co17; the third generation is NdFeB series magnetic materials developed in the early 1980s, which has the characteristics of low price due to its iron-based rare earth materials The fourth generation of re-fe-n and re-fe-c systems are still in the experimental development stage, or it will take decades to achieve large-scale production and high-end applications for NdFeB magnetic materials.