In recent years, with the rapid development of new technologies for sintered neodymium iron boron magnetic materials, China's surface treatment technology for neodymium iron boron magnetic materials has achieved gratifying results, and many excellent technologies have reached or exceeded the level of international developed countries. For example, the latest internationally leading formula developed by the Chinese Academy of Sciences can significantly improve the blackening solution and organic coating formula of neodymium iron boron coatings. The new formula generates an oxide film on the surface, and can withstand neutral salt spray corrosion for up to 600 hours without electroplating chemical plating pollution. Zhongke Sanhuan High tech: an internationally leading formula and process for electroplating black nickel on the surface of neodymium iron boron magnets, with a good black appearance, suitable for appearance parts. Traditional electroplating equipment is sufficient, and the plating solution can be used for long-term use.

Neodymium iron boron magnetic steel is a high-tech material in the national 863 project plan, which belongs to a relatively high-end rare earth material. Its application range is very wide, and its cost-effectiveness is also high. The disadvantage is that its temperature performance is average, and the loss will be relatively large when used in high temperature environments. The maximum temperature point is relatively low, about 80 ℃. However, after special treatment, the maximum usage temperature of neodymium iron boron magnetic steel can reach about 200 ℃.

Rongde neodymium iron boron spray diffusion equipment is a process of directly coating rare earth compounds on magnets, drying treatment after coating, and then high-temperature diffusion treatment in a rare gas environment. This process can significantly improve the coercivity of magnets.

Adding dysprosium oxide to the raw material has the effect of refining the grain size. Then, dysprosium oxide is dissolved in ethanol to form a protective film through organic silicon sol, reducing the consumption and waste of rare earth resources. Then, it is fully infiltrated into the neodymium iron boron matrix through vacuum treatment, greatly increasing the infiltration amount of Dy and enhancing the coercivity of neodymium iron boron.

① Mix dysprosium oxide powder with sodium chloride solution to obtain a suspension. Then, coat the suspension on the surface of neodymium iron boron and let it stand for 30 minutes in an environment of 5-10MPa and 170-300 ℃. After removal, rinse off the residue on the surface of neodymium iron boron and dry for later use;

② Mix dysprosium oxide powder with ethanol solution to form a slurry and coat it on the surface of neodymium iron boron treated in step ①. After rapid drying, obtain semi-finished products;

③ Laser shock treatment is applied to the surface of the semi-finished product's neodymium iron boron, followed by rinsing with deionized water and drying;

The surface dysprosium infiltration treatment method of neodymium iron boron achieves efficient penetration of dysprosium element on the surface of neodymium iron boron magnets through high-temperature and high-pressure induction, laser shock treatment and other methods. The method of surface dysprosium infiltration treatment of neodymium iron boron is simple and convenient, and has important application prospects.