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A nanoparticle-based anisotropic two-phase composite magnet and its preparation method

A nanoparticle and composite magnet technology, applied in magnetic objects, nanotechnology, nanotechnology, etc., can solve the problems of complex preparation methods of soft and hard magnetic exchange coupling nanoparticles, reduced magnetic crystal anisotropy, and reduced driving force of orientation , to achieve the effect of improving anisotropy performance, simple equipment, and convenient operation

Active Publication Date: 2018-10-16
苏州航大新材料科技有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0006] However, as the content of the soft magnetic phase increases, the magnetocrystalline anisotropy of the material decreases, and the driving force for orientation also decreases, which makes the magnetic field orientation very difficult; in addition, the preparation method of soft and hard magnetic exchange-coupled nanoparticles is very complicated, and the preparation The conditions are also very strict

Method used

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  • A nanoparticle-based anisotropic two-phase composite magnet and its preparation method
  • A nanoparticle-based anisotropic two-phase composite magnet and its preparation method
  • A nanoparticle-based anisotropic two-phase composite magnet and its preparation method

Examples

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Effect test

Embodiment 1

[0038] 1.1 Take platinum acetylacetonate (Pt(acac) 2 ) 0.1g, 0.8ml oleylamine, and 0.8ml oleic acid were dissolved in 10m1-octadecene, stirred thoroughly, and heated to 120°C under the protection of nitrogen to obtain solution A.

[0039] 1.2 Take iron pentacarbonyl (Fe(CO) 5 ) 0.072ml, injected into the above-mentioned A solution with a disposable syringe to obtain the mixed solution B, and then heated the solution B to 300° C. for 10 minutes under the protection of nitrogen. After the reaction was completed, the above reaction solution was centrifuged and washed 5 times with acetone and n-hexane to obtain fcc phase FePt nanoparticles.

[0040] 1.3 Take 0.03 g of the above-mentioned fcc phase nanoparticles, magnesium acetylacetonate dihydrate (Mg(acac) 2 2H 2 (0) 0.6 g, 6 ml of oleylamine, and 1.5 ml of oleic acid were dissolved in 15 ml of bibenzyl ether to obtain a mixed solution, and the mixed solution was heated to 300° C. for 1 hour under nitrogen protection. After t...

Embodiment 2

[0047] 2.1 Take platinum acetylacetonate (Pt(acac) 2 ) 0.1 g, 0.8 ml of oleylamine, and 0.8 ml of oleic acid were dissolved in 10 ml of 1-octadecene, stirred thoroughly, and heated to 120° C. under the protection of nitrogen to obtain solution A.

[0048] 2.2 Take iron pentacarbonyl (Fe(CO) 5 ) 0.072ml, injected into the above-mentioned A solution with a disposable syringe to obtain the mixed solution B, and then heated the solution B to 300° C. for 10 minutes under the protection of nitrogen. After the reaction was completed, the above reaction solution was centrifuged and washed 5 times with acetone and n-hexane to obtain fcc phase FePt nanoparticles.

[0049] 2.3 Take 0.04 g of the above fcc phase nanoparticles, magnesium acetylacetonate dihydrate (Mg(acac) 2 2H 2 (0) 0.6 g, 6 ml of oleylamine, and 1.5 ml of oleic acid were dissolved in 15 ml of bibenzyl ether to obtain a mixed solution, and the mixed solution was heated to 300° C. for 1 hour under nitrogen protection. ...

Embodiment 3

[0056] 3.1 Take platinum acetylacetonate (Pt(acac) 2 ) 0.1 g, 0.8 ml of oleylamine, and 0.8 ml of oleic acid were dissolved in 10 ml of 1-octadecene, stirred thoroughly, and heated to 120° C. under the protection of nitrogen to obtain solution A.

[0057] 3.2 Take iron pentacarbonyl (Fe(CO) 5 ) 0.072ml, injected into the above-mentioned A solution with a disposable syringe to obtain the mixed solution B, and then heated the solution B to 300° C. for 10 minutes under the protection of nitrogen. After the reaction was completed, the above reaction solution was centrifuged and washed 5 times with acetone and n-hexane to obtain fcc phase FePt nanoparticles.

[0058] 3.3 Take 0.04 g of the above fcc phase nanoparticles, magnesium acetylacetonate dihydrate (Mg(acac) 2 2H 2 (0) 0.4 g, 6 ml of oleylamine, and 1.5 ml of oleic acid were dissolved in 30 ml of bibenzyl ether to obtain a mixed solution, and the mixed solution was heated to 300° C. for 0.5 hours under nitrogen protection...

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Abstract

The invention provides a nano-particle-based anisotropic two-phase composite magnet and a preparing method. The nano-particle-based anisotropic two-phase composite magnet is characterized in that thetwo-phase magnet is made of nano particles which are of a core-shell structure and formed by hard magnetic phase inner cores and soft magnetic phase shells; orientation is conducted on the nano particles of the core-shell structure by applying a high-intensity magnetic field, and the nano particles of the core-shell structure obtained after orientation are cured with epoxy resin to obtain the nano-particle-based anisotropic two-phase composite magnet. The preparing method is simple in process, convenient to operate and does not need complex equipment. The particle size of the hard magnetic phase inner cores and the thickness of the soft magnetic phase shells can be adjusted in a wide range, and therefore the coercivity, saturation magnetization intensity, maximum magnetic energy product and other properties are adjusted and controlled. The nano two-phase composite magnet is excellent in performance, the ratio of residual magnetization intensity to saturation magnetization intensity (namely the remanence ratio) can reach 0.85, and the maximum magnetic energy product can reach 20 MG Oe.

Description

technical field [0001] The invention relates to a nanoparticle-based anisotropic two-phase composite magnet and a preparation method thereof, belonging to the field of novel nanocomposite magnets. Background technique [0002] Permanent magnet materials are an important class of functional materials. Various functional devices based on permanent magnet materials play an irreplaceable role in people's production and life. Maximum energy product (BH) max It is one of the most important performance indicators of permanent magnet materials, and increasing the maximum magnetic energy product can bring huge economic and environmental benefits. However, in recent years, single-phase permanent magnet materials (such as SmCo 5 、Sm 2 co 17 And the development of NdFeB) has entered the bottleneck period, and the magnetic energy product of industrially produced sintered NdFeB has exceeded 400KJ / m 3 , which is very close to the theoretical value of the material, so it is difficult t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/00H01F1/032H01F41/02B22F9/24B22F1/00B82Y30/00B82Y40/00
Inventor 蒋成保李德耀张天丽刘敬华
Owner 苏州航大新材料科技有限公司
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