Nanocrystalline two-phase coupling rare-earth permanent magnet and preparation method thereof

A rare earth permanent magnet and nanocrystalline technology, which is applied in the manufacture of magnetic objects, permanent magnets, inductors/transformers/magnets, etc., can solve the problems of high cost, low magnetic properties, harsh preparation conditions, etc. Preparation method mild effect

Active Publication Date: 2011-01-19
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of high cost, harsh preparation conditions and low magnetic properties in the prior art, the present invention provides a nanocrystalline two-phase coupled rare earth permanent magnet and its preparation method

Method used

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  • Nanocrystalline two-phase coupling rare-earth permanent magnet and preparation method thereof

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Embodiment 1

[0028] Weigh 3.487g Sm respectively 2 o 3 and 6.67g concentrated HNO 3 (mass fraction 68%), the Sm 2 o 3 Dissolve in HNO at room temperature 3 , stirred at a stirring speed of 120 rpm until fully dissolved; the solution was placed in an environment of 50 ° C to slowly evaporate excess nitric acid, and the obtained Sm(NO 3 ) 3 The crystal was dissolved in 50 mL of deionized water at room temperature, and 1.808 g of oxalic acid was added, and stirred until fully dissolved to obtain the first precursor. Weigh 4.243g Fe(NO 3 ) 3 9H 2 O, 1.8908g oxalic acid and 12.6g polyethylene glycol (molecular weight 600), the above three substances were dissolved in 200mL deionized water, and stirred at a stirring speed of 120 rpm until fully dissolved to obtain the second precursor. Under the condition that the stirring speed is 180 rpm, the first precursor is slowly added dropwise into the second precursor. After the dropwise addition, continue stirring for 20 minutes, then heat th...

Embodiment 2

[0030] Weigh 3.487g Sm respectively 2 o 3 And 6.69g concentrated HCl (mass fraction 36%), the Sm 2 o 3 Dissolve in HCl at room temperature first, and stir at a stirring speed of 120 rpm until fully dissolved; place the solution at 20°C to slowly evaporate excess nitric acid, and the obtained SmCl 3 The crystal was dissolved in 50 mL of deionized water at room temperature, and 2.712 g of oxalic acid was added, and stirred until fully dissolved to obtain the first precursor. Weigh 6.486g Fe(Cl) 3 ·6H 2 O, 3.25g oxalic acid and 12.816g alkyl alcohol polyoxyethylene ether (molecular weight 445) Dissolve the above three substances in 200mL deionized water, stir at a stirring speed of 120 rpm until fully dissolved, and obtain the second precursor. Under the condition that the stirring speed is 180 rpm, the first precursor is slowly added dropwise into the second precursor. After the dropwise addition, continue stirring for 20 minutes, then heat the mixture in a water bath at 4...

Embodiment 3

[0032]Weigh 3.377g Nd respectively 2 o 3 and 5.544g concentrated HNO 3 (mass fraction 75%), the Nd 2 o 3 Dissolve in HNO at room temperature 3 , stirred at a stirring speed of 110 rpm until fully dissolved; the solution was placed in an environment of 45° C. to slowly evaporate excess nitric acid. Will get Nd(NO 3 ) 3 The crystal was dissolved in 65 mL of deionized water at room temperature, and 7.5985 g of ethylenediaminetetraacetic acid was added, and stirred until fully dissolved to obtain the first precursor. Weigh 16.1608g Fe(NO 3 ) 3 9H 2 O, 15.197g of ethylenediaminetetraacetic acid and 24g of polyethylene glycol (molecular weight 600), the above three substances were dissolved in 250mL of deionized water, and stirred at a stirring speed of 110 rpm until fully dissolved to obtain the second precursor. Under the condition that the stirring speed is 170 rpm, the first precursor is slowly added dropwise into the second precursor. Continue to stir for 20 minute...

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Abstract

The invention relates to a rare-earth permanent magnet and a preparation method thereof, which aims to solve the problem of high cost, demanding preparation condition and low magnetism existing in the prior art. The structure of a nanocrystalline two-phase coupling rare-earth permanent magnet provided in the invention is Re-Fe-O / Fe2O3, wherein Re refers to a lanthanide element; and the method for preparing the nanocrystalline two-phase coupling rare-earth permanent magnet comprises the following steps: preparing a precursor firstly by using a soft chemical molecular mixing method, wherein the precursor is a mixture of chelated Re salts and Fe salts; and then carrying out thermal deformation processing on prepared permanent magnetic particles under the conditions that the temperature is 1023 to1273K, the pressure is 20 to 30kNm, and the deformation rate is 50 to 70 percent so as to obtain the nanocrystalline two-phase coupling rare-earth permanent magnet. The invention has the following advantages: the magnetic property of the permanent magnet is higher than that of a common ferrite; the rare-earth content of the raw materials is less and only rare earth oxides are required, therefore, the cost of raw material is low; and the precursors are mixed evenly, and the reaction condition is mild, therefore, the invention has the characteristics of energy conservation and low cost.

Description

technical field [0001] The invention relates to a permanent magnet and a preparation method thereof, in particular to a rare earth permanent magnet and a preparation method thereof. Background technique [0002] Since its inception, rare earth permanent magnets have been widely used in the fields of computers, communications, instrumentation, household appliances, and automobiles. The development direction of magnets used in electronic components in the above fields is: high performance, light weight, miniaturization, energy saving, precision, and low cost. Bonded magnets have the characteristics of precision; and high performance, light weight, miniaturization, and energy saving all require bonded magnets to have high magnetic properties, but the rare earth permanent magnet bonded magnets prepared by the current existing technology Magnetic properties are low. [0003] The third-generation rare earth permanent magnet Nd-Fe-B developed in the early 1980s and the Sm-Fe-N pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F7/02H01F1/053H01F41/02
Inventor 刘亚青周兴孙友谊江涌赵贵哲
Owner ZHONGBEI UNIV
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