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NdFeB alloy powder, NdFeB magnet material, preparation method and application

A technology of NdFeB and magnets, which is applied in the manufacture of magnetic materials, magnetic objects, inductors/transformers/magnets, etc., can solve the problems of not being able to significantly improve the performance of magnet materials, and achieve high coercivity and remanence at low cost. Effect

Active Publication Date: 2022-05-03
FUJIAN CHANGTING GOLDEN DRAGON RARE EARTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the technical problems in the prior art that only a small amount of sulfur can be added to increase the coercive force of the magnet, the performance of the magnet material cannot be significantly improved, and a large amount of heavy rare earth elements needs to be added

Method used

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  • NdFeB alloy powder, NdFeB magnet material, preparation method and application
  • NdFeB alloy powder, NdFeB magnet material, preparation method and application
  • NdFeB alloy powder, NdFeB magnet material, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0114]According to the composition and content of the NdFeB alloy powder listed in Example 1 in Table 1, the thickness of the corresponding no added sulfur element is 0.3mm NdFeB alloy casting sheet, and the alloy casting sheet is under the hydrogen pressure of 0.08MPa After saturated hydrogen absorption and internal dehydrogenation at 500°C, it is further refined to a particle size of 4 μm by jet milling in the mill chamber of a jet mill with an oxygen content below 15 ppm; among them, the sorting wheel in the jet mill process The rotating speed is 4000rpm / min. Then in this powder, add the 0.11wt% sulfur simple substance that particle diameter is 100nm to obtain mixture, then make the NdFeB alloy powder containing sulfur element listed in Example 1 in Table 1 after the mixture is mixed on a three-dimensional mixer for 3h ; Sulfur-containing NdFeB alloy powders were sequentially oriented in a magnetic field above 1.8T, sintered at 1070°C for 6 hours, and heat-treated at 500°C ...

Embodiment 3

[0116] According to the composition and content of the neodymium-iron-boron alloy powder listed in embodiment 3 in table 1, it is the neodymium-iron-boron alloy casting sheet that the thickness that does not add sulfur element is 0.3mm to prepare corresponding, this neodymium-iron-boron alloy casting sheet is at 0.08 After saturated hydrogen absorption under the hydrogen pressure of MPa, dehydrogenation within 500°C, and then further refinement by jet mill in the mill chamber of jet mill with oxygen content below 15ppm, 35ml / min to feed SO into the mill chamber 2 gas to obtain sulfur-containing neodymium-iron-boron alloy powder with a particle size of 4 μm, wherein the rotating speed of the sorting wheel in the jet milling process is 4000 rpm / min. Sulfur-containing NdFeB alloy powders were oriented in a 2T magnetic field, sintered at 1080°C for 6 hours, and heat-treated at 500°C for 6 hours to obtain sulfur-containing NdFeB magnet materials.

Embodiment 4

[0118] The composition and content of Nd-Fe-B alloy powder listed in Example 4 in Table 1 are prepared to correspond to the Nd-Fe-B alloy casting sheet with a thickness of 0.3mm without adding sulfur element, and the Nd-Fe-B alloy casting sheet is 0.08 After saturated hydrogen absorption under MPa hydrogen pressure, dehydrogenation at 500°C, and then further refined by jet mill in the mill chamber of jet mill with oxygen content below 15ppm, 71ml / min to feed SO into the mill chamber 2 gas to obtain sulfur-containing neodymium-iron-boron alloy powder with a particle size of 4 μm, wherein the rotating speed of the sorting wheel in the jet milling process is 4000 rpm / min. Sulfur-containing NdFeB alloy powders were oriented in a 2T magnetic field, sintered at 1080°C for 6 hours, and heat-treated at 500°C for 6 hours to obtain sulfur-containing NdFeB magnet materials.

[0119] The neodymium-iron-boron magnet material of embodiment 2,5~10, comparative example 1~3,5 and 6 is accord...

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Abstract

The invention discloses NdFeB alloy powder, NdFeB magnet material, preparation method and application. Among them, the neodymium-iron-boron alloy powder, in terms of mass percentage, includes the following components: R: 29.5-31.5wt%, R is a rare earth element, and R includes at least Nd; B: 0.85-0.92wt%, S: 0.1~0.5wt%, Fe: 64~68wt%; N: 0.2~0.6wt%; N includes one or more of Zr, Nb, Hf and Ti; the mass ratio of N to S is (1~4.1) : 1, wherein S is derived from sulfur element and / or sulfur oxide. The neodymium-iron-boron magnet material obtained by using the NdFeB alloy powder can still significantly improve the coercive force and remanence of the magnet material under the condition that the use of heavy rare earth elements is reduced or even no heavy rare earth elements are added.

Description

technical field [0001] The invention specifically relates to NdFeB alloy powder, NdFeB magnet material, preparation method and application. Background technique [0002] Take Nd 2 Fe 14 Neodymium-iron-boron (NdFeB) magnet material with B as the main component has high remanence, coercive force and maximum magnetic energy product, and excellent comprehensive magnetic properties. It is used in wind power generation, new energy vehicles, and frequency conversion home appliances. Because the heavy rare earth elements Dy and Tb play an irreplaceable role in high-performance sintered NdFeB magnets, but due to the high price and limited reserves of heavy rare earth elements, it is necessary to find ways to improve the correction of sintered NdFeB magnets without using or using less heavy rare earth elements. tenacious way. [0003] Chinese patent document CN108155004A discloses a high-performance sintered NdFeB magnet. In this patent, sulfur and low-melting point metals are comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02C22C38/60C22C38/14C22C38/12C22C38/16C22C38/10C22C38/06C22C33/02
CPCH01F1/0577H01F41/0253C22C38/005C22C38/32C22C38/60C22C38/14C22C38/12C22C38/002C22C38/16C22C38/10C22C38/06C22C33/0278
Inventor 牟维国韦兴张志琦黄清芳许德钦范宇峰
Owner FUJIAN CHANGTING GOLDEN DRAGON RARE EARTH CO LTD
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