Medium-to-high grade neodymium-iron-boron magnet with composite addition of gadolinium and holmium

Abstract

The invention discloses a medium-to-high grade neodymium-iron-boron magnet with composite addition of gadolinium and holmium, which is composed of the following components by weight percentage: 20 percent-33 percent of praseodymium-neodymium alloy, 0.5 percent-10 percent of gadolinium, 0.5 percent-10 percent of holmium, 0.9 percent-1.2 percent of boron, 0.1 percent-0.8 percent of aluminum, 0.1 percent-0.5 percent of copper, 0.1 percent-0.5 percent of zirconium, 0.1 percent-0.5 percent of titanium, 0 percent-10 percent of dysprosium, 0 percent-3.0 percent of cobalt and the balance of iron and a small amount of inevitable impurities in materials. The medium-to-high grade neodymium-iron-boron magnet with composite addition of gadolinium and holmium has high corrosion resistance, square degree and magnetic energy product; furthermore, the powder discharging speed of the powder production procedure in the preparation process is fast, thereby shortening the production cycle, improving the magnetic performances of the magnet and enhancing the enterprise competitiveness.

Description

technical field [0001] The invention relates to the technical field of neodymium iron boron permanent magnet materials, in particular to medium and high grade neodymium iron boron magnets compounded with gadolinium Gd holmium Ho. Background technique [0002] As an emerging industry, NdFeB permanent magnet materials have developed rapidly around the world because of their good cost performance, and are widely used in international and domestic emerging industries and pillar industries, such as computer industry, information industry, Communication industry, automobile industry, nuclear magnetic resonance imaging industry, office automation, etc. [0003] With the rapid development of the industry, medium and high-grade NdFeB magnets that meet higher requirements for use are also being continuously improved, but the praseodymium-neodymium (PrNd) alloys, dysprosium (Dy) and so on used in traditional medium-high grade NdFeB magnets Rare earth raw materials are often in short s...

AI Technical Summary

Problems solved by technology

[0003] With the rapid development of the industry, medium and high-grade NdFeB magnets that meet higher requirements for use are also being continuously improved, but the praseodymium neodymium (PrNd) alloys, dysprosium (Dy) and so on used in traditional medium and high-grade NdFeB magnets Rare earth raw materials are often in short supply and resources are increasingly scarce, and their prices have also skyrocketed, which increases the production cost of medium and high-performance NdFeB magnets; and the existing medium and high-grade NdFeB magnets still have poor corrosion resistance and squareness Problems such as low sum magnetic energy product and slow powder output speed in the powder making process during the preparation process

[0004] In order to reduce the cost, the Chinese application patent publication number is CN101071667A "NdFeB Rare Earth Permanent Magnet Material Containing Gadolinium and Its Manufacturing Method", which uses the addition of gadolinium (Gd) in NdFeB to partially replace the relatively expensive neodymium to reduce the cost. cost, which improves the heat resistance of the magnet, but its addition amount is only 0.05-0.2wt%, which still cannot effectively reduce the production cost

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