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Modified ultrafine powder, rare earth permanent magnet, raw material, preparation method and use

A technology of ultra-fine powder and permanent magnet materials, which is applied in the manufacture of magnetic objects, magnetic materials, inductors/transformers/magnets, etc., and can solve the problem of not being able to realize the efficient utilization of submicron NdFeB ultra-fine powder and recycled materials at the same time problem, to achieve the effect of increasing remanence and coercive force, increasing volume fraction, and increasing coercive force

Active Publication Date: 2022-07-22
FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to overcome 1) the efficient utilization of submicron neodymium-iron-boron ultrafine powder and recycled materials in the prior art, and 2) the excessive use of rare earth permanent magnets to PrNd elements, and Provides modified ultrafine powder, rare earth permanent magnet, raw materials, preparation methods, and uses

Method used

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  • Modified ultrafine powder, rare earth permanent magnet, raw material, preparation method and use
  • Modified ultrafine powder, rare earth permanent magnet, raw material, preparation method and use
  • Modified ultrafine powder, rare earth permanent magnet, raw material, preparation method and use

Examples

Experimental program
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Effect test

Embodiment 1～6 and comparative example 1～2

[0221] (1) Weigh the raw materials in Table 1 according to the proportions shown in Examples 1 to 6 and Comparative Examples 1 to 2 in Table 2, and under the protection of inert gas, first mix the submicron ultrafine powder with 40~ 60wt% of NdFeB waste was mixed, then cyclohexane and antioxidant were mixed at 2.0ml / kg cyclohexane (no cyclohexane was added in Example 6) and 2.0ml / kg antioxidant, and finally the remaining part of neodymium was added Iron boron waste, namely the mixed powder C;

[0222] (2) Weigh 1.5kg of mixed powder C and place it in a vacuum sealing bag, and seal it with a vacuum sealing machine. The operation process is completed under the protection of inert gas, and then put the sealed alloy powder C into cold isostatic pressing. The treatment time of isostatic pressing under 240MPa is 20s;

[0223] (3) The mixed powder C that has been sealed in step (2) is subjected to segmented sintering treatment and air cooling to obtain a sintered ultrafine powder bl...

Embodiment 7～11 and comparative example 3～4

[0239] (1) Casting process: the raw material compositions shown in Examples 7 to 11 and Comparative Examples 3 to 4 in Table 5 below, take the composition of the corresponding proportion and put it into a vacuum melting furnace at 5×10 -2 Vacuum smelting is carried out at a temperature below 1800°C in a vacuum of Pa; then the melt obtained by smelting is cast by the thin strip continuous casting method to obtain an alloy sheet, and the thickness of the alloy sheet is 0.3 mm.

[0240] (2) Coarse pulverization process: at room temperature, the alloy flakes in step (1) are placed in flowing hydrogen, and subjected to hydrogen adsorption treatment for 1 hour. The dehydrogenation treatment was carried out at °C for 2 hours to obtain a coarsely pulverized powder, and the particle size of the coarsely pulverized powder was 1 mm.

[0241] (3) Micro-pulverization process: use jet mill to pulverize the coarsely pulverized powder in step (2) to obtain a finely pulverized powder with an a...

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Abstract

The invention discloses modified ultrafine powder, rare earth permanent magnet, preparation method, raw material and application. In the modified ultrafine powder, it includes the following components: PrNd: 44.5-58.5wt%; Gd: 0-2wt%; Ho: 0.04-1wt%; Dy: 0.04-2wt%; Tb: 0-1wt%; Al : 0.025-0.8wt%; Cu: 0.04-0.3wt%; Co: 0.2-2wt%; Ga: 0.04-0.2wt%; Zr: 0-0.2wt%; Ti: 0-0.2wt%; Nb: 0- 0.2wt%; B: 0.5-1wt%; the balance is Fe and inevitable impurities. Using the modified ultrafine powder as the raw material for preparing the permanent magnet, the magnetic properties of the obtained permanent magnet are greatly improved, the coercive force is increased from 11kOe to 16-21kOe, and the production cost is reduced at the same time.

Description

technical field [0001] The invention relates to modified ultrafine powder, rare earth permanent magnet, raw material, preparation method and application. Background technique [0002] NdFeB permanent magnet material has been widely used since its birth due to its excellent performance, and is currently the most widely used rare earth permanent magnet material. With the rapid growth of the demand for NdFeB materials, the consumption of rare earth elements such as PrNd, Dy and Tb is increasing year by year. With the increase in environmental protection and the popularization of the concept of comprehensive and balanced utilization of rare earth resources, the large consumption of rare earth elements such as PrNd, Dy, and Tb has gradually attracted everyone's attention. [0003] There are two specific problems currently faced. On the one hand: in the preparation process of NdFeB permanent magnet materials, the normal NdFeB waste particles in the pulverization stage of jet mill...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02B22F1/14
CPCB22F1/0003H01F1/0577H01F41/0266H01F41/0293
Inventor 王金磊黄清芳许德钦刘少伟
Owner FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD