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A kind of preparation method of NdFeB magnet with high Curie point

A high Curie point, NdFeB technology, used in magnetic objects, inductor/transformer/magnet manufacturing, magnetic materials, etc., can solve the problem of low coercivity, low Curie temperature of permanent magnet materials, and low magnetic flux density. higher question

Active Publication Date: 2016-05-18
ZHEJIANG ACTIVETECH COMP TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the Curie temperature of Nd-Fe-B permanent magnet materials is not high, generally below 130°C, and the magnetic flux density is not high at the same time, because the coercivity of these two types of magnetic materials is not high due to defects in the crystallization process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] This magnet of the present embodiment adopts the permanent magnet material of following molecular formula: (La 0.12 Y 0.25 Nd 0.63 ) 26 (Fe 0.81 mn 0.12 Cr 0.07 ) 69.2 B 4.5 f 0.3 .

[0021] Weigh the raw materials according to the proportion, mix the weighed raw materials and put them into a vacuum electromagnetic induction furnace for melting under an argon atmosphere. Add ferro-yttrium alloy, ferro-lanthanum alloy, ferromanganese alloy, ferrochrome alloy, ferric fluoride and borax according to the composition of the ingredients, and then melt, and finally add the balance of iron calculated according to the proportion, and cast ingots after melting.

[0022] Put the ingot into a quartz glass tube with a small hole at the bottom, and place it in a vacuum spray casting furnace with pulse electric field and pulse magnetic field devices, place a water-cooled copper mold at the lower end of the quartz tube, and cast the ingot in high-purity argon Inductively melt...

Embodiment 2

[0028] This magnet of the present embodiment adopts the permanent magnet material of following molecular formula: (La 0.14 Y 0.32 Nd 0.54 ) 28 (Fe 0.64 mn 0.27 Cr 0.09 ) 65.9 B 5.6 f 0.5 , where w=0.14, x=0.32, y=0.27, z=0.09, a=28, b=5.6, c=0.5.

[0029] Weigh the raw materials according to the proportion, mix the weighed raw materials and put them into a vacuum electromagnetic induction furnace for melting under an argon atmosphere. Add ferro-yttrium alloy, ferro-lanthanum alloy, ferromanganese alloy, ferrochrome alloy, ferric fluoride and borax according to the composition of the ingredients, and then melt, and finally add the balance of iron calculated according to the proportion, and cast ingots after melting.

[0030] Put the ingot into a quartz glass tube with a small hole at the bottom, and place it in a vacuum spray casting furnace with pulse electric field and pulse magnetic field devices, place a water-cooled copper mold at the lower end of the quartz tube,...

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Abstract

The invention relates to a method for preparing a neodymium iron boron magnet with a high Curie point. The atom molecular formula of magnet permanent materials adopted in the magnet is as follows: (LawYxNd1-w-x) a (Fel-y-zMnyCrz) 100-a-b-c Bb Fc, wherein w=0.12-0.14, x=0.25-0.32, y=0.12-0.27, z=0.07-0.09, a=26-28, b=4.5-5.6, and c=0.3-0.5. The method includes the steps of permanent magnet powder manufacturing, blank manufacturing, sintering and surface treatment. According to the magnet prepared through the method, neodymium is replaced by adding lanthanum and yttrium, so the cost is lowered; the Curie point of the materials is improved by adding chromium and iron, and finally the coercivity of the magnet is further improved through surface treatment. Thus, the magnet is more suitable for being used at high-temperature environments.

Description

Technical field [0001] The invention relates to a preparation method of an NdFeB magnet with a high Curie point. Background technique [0002] With excellent magnetic properties, the application range of Nd-Fe-B permanent magnets is increasing. The recent challenges of environmental issues have expanded the application of these magnets from household appliances to industrial equipment, electric vehicles and wind turbines. Further improvements in the performance of Nd-Fe-B magnets are required. [0003] However, the Curie temperature of Nd-Fe-B permanent magnet materials is not high, generally below 130°C, and the magnetic flux density is not high at the same time, because the coercive force of these two types of magnetic materials is not high due to defects in the crystallization process. The existing technology proposes to use the existing NdFeB magnet as the base and add some auxiliary elements to increase the Curie temperature and coercive force of the NdFeB magnet. Ho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F1/057H01F7/02C23C10/26
Inventor 应忠良
Owner ZHEJIANG ACTIVETECH COMP TECH CO LTD
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