Preparation method of rare earth doped high-coercivity manganese-bismuth alloy magnetic powder

A coercive manganese-bismuth and rare earth-doped technology, which is applied in the field of preparation of rare earth-doped high-coercive manganese-bismuth alloy magnetic powder, can solve the problem that the uniform distribution of doping elements cannot be guaranteed, the doping elements cannot be uniformly distributed, and waste of manpower and material resources Resources and other issues, to achieve the effect of easy operation, reduce production costs, and improve the intrinsic coercive force

Inactive Publication Date: 2016-06-22
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The addition of element doping is mostly added together with the main alloy of manganese and bismuth during the alloy smelting process. Due to the poor fluidity of the molten metal, the doping elements cannot be evenly distributed in the main alloy. To improve the dispersion of doping elements in the main alloy, while wasting manpower and material resources, it is still impossible to ensure the uniformity of doping elements distribution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Ingredients: According to the alloy molar composition Mn 45 Bi 55 , taking Mn and Bi with a purity of more than 99.99% as raw materials for weighing ingredients;

[0021] 2) Melting: Use the arc melting method to put the prepared raw materials into the arc melting furnace under the protection of argon, first melt with a low current of 20A~30A for about 5 minutes, and after the ingot is completely melted, increase the current to 50A~ 60A and then smelt for about 3 minutes, cool down, turn over the ingot and repeat the smelting 3 times to get Mn 45 Bi 55 alloy ingot;

[0022] 3) coarse crushing: the Mn obtained in step 2) 45 Bi 55 Alloy ingots are crushed and passed through a 20-mesh sieve to obtain Mn 45 Bi 55 Coarse particles;

[0023] 4) Mixing: the Mn prepared in step 3) 45 Bi 55 Coarse particles soaked in rare earth lanthanide porous polymer [(Pr,Nd) 2 (PDA) 3 (H 2 O)]·2H 2 In the mixed liquid of O and absolute ethanol, obtain suspension; The amount ...

Embodiment 2

[0035] 1) Ingredients: According to the alloy molar composition Mn 50 Bi 50 , taking Mn and Bi with a purity of more than 99.99% as raw materials for weighing ingredients;

[0036] 2) Melting: Use the arc melting method to put the prepared raw materials into the arc melting furnace under the protection of argon, first melt with a low current of 20A~30A for about 5 minutes, and after the ingot is completely melted, increase the current to 50A~ 60A and then smelt for about 3 minutes, cool down, turn over the ingot and repeat the smelting 3 times to get Mn 50 Bi 50 alloy ingot;

[0037] 3) coarse crushing: the Mn obtained in step 2) 50 Bi 50 Alloy ingots are crushed and passed through a 20-mesh sieve after crushing;

[0038] 4) Mixing: the Mn prepared in step 3) 50Bi 50 Coarse particles soaked in [Tb(2,5-pdc)(OH)(H 2 O) 2 ]·H 2 O and DyCl 3 In the mixed liquid of the rare earth complex and absolute ethanol, a suspension is obtained; the amount of the mixed liquid acco...

Embodiment 3

[0050] 1) Ingredients: According to the alloy molar composition Mn 55 Bi 45 , taking Mn and Bi with a purity of more than 99.99% as raw materials for weighing ingredients;

[0051] 2) Melting: Use the arc melting method to put the prepared raw materials into the arc melting furnace under the protection of argon, first melt with a low current of 20A~30A for about 5 minutes, and after the ingot is completely melted, increase the current to 50A~ 60A and then smelt for about 3 minutes, cool down, turn over the ingot and repeat the smelting 3 times to get Mn 55 Bi 45 alloy ingot;

[0052] 3) coarse crushing: the Mn obtained in step 2) 55 Bi 45 Alloy ingots are crushed and passed through a 20-mesh sieve after crushing;

[0053] 4) Mixing: the Mn prepared in step 3) 55 Bi 45 Coarse particles were soaked in carboxylic acid Tb rare earth complexes and OH bridge-containing rare earth pyridinedicarboxylic acid complexes [Tm(2,5-pdc)(OH)(H 2 O) 2 ]·H 2 In the mixed liquid of th...

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Abstract

The invention relates to a preparation method of rare earth doped high-coercivity manganese-bismuth alloy magnetic powder. The preparation method comprises the following steps: dissolving a rare earth complex into anhydrous ethanol, then uniformly soaking manganese-bismuth alloy microparticles into the anhydrous ethanol containing the rare earth complex, then ensuring rare earth elements to diffuse into and enter crystal lattices of manganese-bismuth molecules in an atom form through high-energy ball milling, and ensuring doped elements to be uniformly dispersed into main alloy so as to dramatically improve the magnetocrystalline anisotropy of the magnetic powder. The finally prepared rare earth doped manganese bismuth magnetic powder has the coercivity which is dramatically higher than that of cobalt-manganese-bismuth magnetic powder without containing the rare earth. According to the method, MnBi coarse particles are soaked into mixed liquid of the rare earth complex and the anhydrous ethanol, the rare earth complex uniformly wraps powder particles, the rare earth elements can be uniformly dispersed into the crystal lattices of the manganese-bismuth molecules in the ball milling process, the magnetocrystalline anisotropy of MnBi is improved, and thus the intrinsic coercivity of the MnBi alloy is imroved; and in addition, the process is simple, the operation is easy, and the production cost of high-performance magnetic powder is lowered.

Description

(1) Technical field [0001] The invention relates to a preparation method of rare earth-doped high-coercivity manganese-bismuth alloy magnetic powder. (2) Background technology [0002] With the rapid development of science and technology, especially in the automotive, aerospace and other fields, there are stricter requirements for various materials under various extreme environmental conditions. As the most important functional material, permanent magnets are increasingly used in the fields of national economy and science and technology. At present, NdFeB magnets have attracted people's attention because of their high magnetic properties and good mechanical properties. However, since the Curie temperature of NdFeB magnets is only 318°C, the operating temperature is mostly lower than 100°C, which greatly limits its use at high temperatures. MnBi alloy is a traditional magnetic material, its Curie temperature can reach 360°C, and it has a positive temperature coefficient of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04B22F1/02H01F1/059
CPCH01F1/059B22F9/04B22F2009/043B22F1/16
Inventor 张朋越吴琼杨洋葛洪良泮敏翔
Owner CHINA JILIANG UNIV
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