Neodymium iron boron magnet, preparation method and device applying same

Abstract

The invention discloses a neodymium iron boron magnet, a preparation method and a device applying the same, belonging to the field of magnetic materials. The magnet comprises the following components in percentage by weight according to the general formula: 27 to 35 percent of R representing one or two rare-earth elements except Gd, 0.55 to 2 percent of Gd, 0.5 to 3.5 percent of Co, 0.05 to 0.5 percent of M1 representing one transition metal element such as Cu, Al or Ge, 0 to 0.5 percent of M2 being one or two transition metal elements except Co and M1, 0.9 to 1.2 percent of B (namely boron) and the balance of Fe and unavoidable impurities. The neodymium iron boron magnet disclosed by the invention is compounded with Gd, Co, M1 and M2, thus the reversible magnetic induction temperature coefficient alpha and the coercive force temperature coefficient beta are better improved, the coercive force of the magnet is greatly improved while the magnetic energy product and residual magnetism are guaranteed not to reduce, the heavy rare earth element Gd is effectively utilized, and the performance is improved while the manufacturing cost is well saved.

Description

technical field [0001] The invention relates to a neodymium-iron-boron magnet, a preparation method and a device using the magnet, belonging to the field of magnetic materials. The invention is mainly a method for preparing a low-cost magnet with good high-temperature stability by adjusting the element composition and adding low-cost elements Gd and Co, M1, and M2 in combination. Background technique [0002] Neodymium iron boron (NdFeB) permanent magnet has the characteristics of small size, light weight and strong magnetism. It is the magnet with the best performance and price ratio so far, and is known as the king of magnetism in the magnetic field. NdFeB permanent magnet materials are widely used in high-tech fields such as computers, communications, and national defense due to their excellent performance, and new application fields continue to emerge. Its development and application level has become a symbol of a country's national strength and development level. Motor...

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Problems solved by technology

[0003] For example, adding a certain amount of heavy rare earth elements Tb, Dy and transition metals Cu, Zr, Ga, Al, etc. to the sintered NdFeB master alloy can effectively improve the coercive force of the magnet, especially the addition of heavy rare earth elements Tb and Dy, It can significantly improve the coercive force of the magnet, but Tb and Dy are expensive strategic metals, their reserves are limited, the price is expensive, and it is achieved by sacrificing the remanence and magnetic energy product while bringing about the improvement of the coercive force, so It is necessary for us to explore other substituting elements to improve the coercivity and ensure that other properties do not decrease

Zhongke Sanhuan (application number 200710090597.3) mentioned that the use of Gd can increase the coercive force of the magnet, but its Gd range is narrow. a very important indicator of

Jiangxi Chen Jiuchang only mentioned mixing rare earth metals containing Gd. Although the cost of rare earth raw materials has been reduced, this method can only produce low-grade magnets, and no significant increase in coercive force has been found. Research on other performance indicators of magnets

In a word, the previous research found that Gd was used to improve the coercive force, but it was not found that the compound addition of Co, M1, and M2 through composition adjustment can be used to achieve performance optimization, so that the coercive force can be increased without reducing the remanence and magnetic energy product of the magnet. Not to mention the reversible magnetic induction temperature coefficient α and coercive force temperature coefficient β

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