烧结钕铁硼磁钢表面渗镝处理方法
发布时间:
2022-01-10
近年来，随着烧结钕铁硼磁性材料新技术的快速发展
近年来，随着烧结钕铁硼磁性材料新技术的快速发展，我国钕铁硼磁性材料表面处理技术取得了可喜的成果，许多优秀技术达到或超过了国际发达国家的水平。例如，中国科学院开发的最新国际领先配方可以显着改善钕铁硼涂料的发黑溶液和有机涂层配方。新配方在表面生成氧化膜，可承受中性盐雾腐蚀长达600小时，无电镀化学镀污染。中科三环高科: 国际领先的钕铁硼磁铁表面电镀黑镍的配方和工艺，具有良好的黑色外观，适用于外观件。传统的电镀设备就足够了，镀液可以长期使用。
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.
