A high-temperature resisting R-Fe-B agglomeration permanent magnetic material and its making method

Abstract

The invention discloses a permanent magnetic material and a manufacturing method thereof, in particular relating to a high-temperature resistant R-Fe-B sintering permanent magnet material and a manufacturing method thereof, which belongs to the rare earth permanent magnetic material technical field, wherein, the oxygen free technical skill and the high-temperature return sintering technology under the protection of inert gases or N2 gas are adopted during the manufacturing process, thereby the oxygen content in a magnet is controlled to be within the rang of 100 to 900 parts per million; the hydrogen content is less than 10 parts per million; (BH)max] value and [jHc] value is equal to 60-75; moreover, due to more uniform nd-rich phase distribution, holes are reduced; the thermal stability of the magnet is good; the application temperature can reach 270 DEG C; the magnet is high-temperature resistant; the rare earth gross amount in the magnet is not more than 32 weight percent, thereby consumption of expensive rare earths is reduced; particularly the dosage of heavy rare earths is reduced by approximately 30 percent, thereby the production cost is greatly reduced and the economic benefit is prominent.

Description

1. Technical field [0001] The invention discloses a permanent magnet material and a manufacturing method thereof, in particular to a high temperature resistant R-Fe-B system sintered permanent magnet material and a manufacturing method thereof, belonging to the technical field of rare earth permanent magnet materials. 2. Background technology [0002] In recent years, due to the high magnetic performance, low price and abundant reserves of sintered Nd-Fe-B magnets, people have paid more and more attention to the application of sintered Nd-Fe-B magnets in the miniaturization and high-performance motors of automobiles, home appliances and IT devices, especially because of The improvement of energy saving and environmental protection requirements has prompted the development of electric vehicles (HEV) and fuel hybrid vehicles (FCHV) to enter the practical stage. The parts where sintered Nd-Fe-B magnets are used in automobiles are: (1) driving motors / generators of HEV (electric ...

AI Technical Summary

Problems solved by technology

However, due to the scarcity and high price of such heavy rare earth elements, the cost of magnets will be greatly increased, making it difficult for users to accept, which limits the application of Nd-Fe-B magnets in motors

In addition, when the amount of its addition exceeds a certain amount, although the coercive force can be improved, but due to the excessive oxygen content and heavy rare earth content, Br decreases, and the magnet performance often fails to meet the user's requirements.

[0014] The sintered Nd-Fe-B magnet containing C given by the patent CN1098368C of Dowa Mining Co., Ltd. of Japan, although the operating temperature of the magnet can also reach 200 ° C, but its The performance is very low, the maximum (BH)max is only 40, and the maximum Hcj is only 17

[0015] Shin-Etsu Chemical Co., Ltd. adopts complex magnet surface coating technology to increase the service temperature of the magnet under a small demagnetization field (PC=-2), but its process Complex (additional process), inconvenient to use in actual production, and low magnetic energy product

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