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A kind of zirconium-containing sintered neodymium-iron-boron magnet and its preparation method

A neodymium iron boron and magnet technology, used in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve problems such as price instability or large fluctuations, lack of reserves, and reduce remanence, and achieve grain refinement. , weaken the magnetic exchange coupling and improve the effect of remanence

Active Publication Date: 2022-03-01
JIANGXI JLMAG RARE EARTH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the reserves of heavy rare earths Dy and Tb are scarce and expensive, and at the same time will reduce the remanence; and because Dy and Tb are vulnerable to the impact of rare earth policies, there is a risk of price instability or large fluctuations

Method used

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  • A kind of zirconium-containing sintered neodymium-iron-boron magnet and its preparation method
  • A kind of zirconium-containing sintered neodymium-iron-boron magnet and its preparation method
  • A kind of zirconium-containing sintered neodymium-iron-boron magnet and its preparation method

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preparation example Construction

[0051] The present invention also provides a method for preparing the above-mentioned zirconium-containing NdFeB magnet, comprising the following steps:

[0052] A) The raw material of the NdFeB sintered magnet is subjected to quick-setting flake treatment to obtain NdFeB quick-setting flakes;

[0053] B) performing hydrogen crushing and jet milling on the NdFeB quick-setting flakes in turn to obtain NdFeB powder;

[0054] C) performing orientation molding and sintering on the NdFeB powder in sequence to obtain a zirconium-containing NdFeB magnet.

[0055] In the above steps of the present invention, the selection principles and preferred ranges of NdFeB raw materials correspond to the selection principles and preferred ranges of NdFeB raw materials unless otherwise specified, and will not be repeated here.

[0056] In the present invention, firstly, NdFeB raw materials are subjected to a quick-setting flake process to obtain NdFeB quick-setting flakes.

[0057] The present ...

Embodiment 1

[0076] Carry out batching according to the embodiment 1 shown in table 1, the raw material obtained is smelted in the vacuum induction melting furnace, will obtain melt and cast at 1460 ℃, be cooled on the copper roll that rotating speed is 40 revs / min, obtain the average thickness of 0.30mm Nd-Fe-B alloy cast piece; carry out hydrogen crushing to the cast piece, the hydrogen absorption time in the hydrogen crushing process is 1 hour, the dehydrogenation time is 5 hours, the dehydrogenation temperature is 580°C, cool for 2 hours, and The obtained powder was subjected to jet milling to obtain a powder with a particle size of 3.8 μm. The obtained powder was subjected to magnetic field orientation molding treatment under a 17320 Gauss magnetic field in a sealed oxygen-free glove box, and then subjected to isostatic pressing treatment under 200 MPa to obtain Magnet blank: Sinter the magnet blank at 1060°C for 6 hours, then perform aging treatment at 910°C for 2 hours, and finally p...

Embodiment 2

[0083]Carry out batching according to the embodiment 2 shown in table 1, the raw material obtained is smelted in the vacuum induction melting furnace, will obtain melt and cast at 1450 ℃, be cooled on the copper roll that rotating speed is 40 rev / mins, obtain average thickness of 0.28mm Nd-Fe-B alloy casting piece; the casting piece is subjected to hydrogen crushing, the hydrogen absorption time in the hydrogen crushing process is 1 hour, the dehydrogenation time is 5 hours, the dehydrogenation temperature is 580 ° C, cooling for 2 hours, and the The obtained powder is subjected to jet milling to obtain a powder with a particle size of 3.8 microns. The obtained powder is subjected to magnetic field orientation forming treatment under a 17500 Gauss magnetic field in a sealed anaerobic glove box, and then isostatically pressed at 200 MPa to obtain Magnet blank: Sinter the magnet blank at 1070°C for 6 hours, then perform aging treatment at 910°C for 2 hours, and finally perform ag...

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Abstract

The present invention provides a kind of such as formula R x T 100‑x‑y1‑y2‑ z m y1 A y2 B z The zirconium-containing sintered NdFeB magnet shown; wherein, 28.5%≤x≤32.5%, 0%≤y1≤1.0%, 0.67%≤y2≤2.4%, 0.85%≤z≤1.0%; R is selected from Pr, One or more of Nd and RH, RH is selected from one or more of Dy and Tb; M is selected from one or more of Ti, Nb, Hf and Mn; A is Cu, Ga, Al and Zr; T is selected from Fe and Co. In the present invention, among the alloy elements A, zirconium element is added and a specific addition amount is optimally designed, and the remaining components are specially designed to improve the remanence, coercive force and magnetic energy product of the magnet alloy, and have higher performance , the production cost is reduced, the process is simple, the applicability is wide, and it is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a zirconium-containing sintered NdFeB magnet and a preparation method thereof. Background technique [0002] Sintered NdFeB is the permanent magnet with the highest energy density discovered so far, and it has achieved large-scale commercial production. Since its discovery, sintered NdFeB sintered magnets have been widely used in many fields such as computer hard disks, hybrid vehicles, medical care, and wind power generation, and their application scope and output are still increasing year by year, especially in the field of new energy vehicles. [0003] Many applications of NdFeB sintered magnets are in high temperature environments, so it is required not only to have high remanence, but also to have high coercive force. Among them, the coercive force is the main parameter of the permanent magnet material, and the higher the coercive force, the stronger its anti-dem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F1/047H01F41/02
CPCH01F1/0573H01F1/0576H01F1/0577H01F1/047H01F41/0266H01F41/0253
Inventor 毛琮尧毛华云孙长山徐志欣曾庆文
Owner JIANGXI JLMAG RARE EARTH
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