Nano-particle-based anisotropic two-phase composite magnet and preparing method

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

Active Publication Date: 2018-01-09
苏州航大新材料科技有限公司
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  • 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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  • Nano-particle-based anisotropic two-phase composite magnet and preparing method
  • Nano-particle-based anisotropic two-phase composite magnet and preparing method
  • Nano-particle-based anisotropic two-phase composite magnet and preparing 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 are dissolved in 10ml-octadecene, fully stirred, 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, use a disposable syringe to inject the above A solution to obtain a mixed solution B, and then heat the solution B to 300°C for 10 minutes under the protection of nitrogen. After the reaction is completed, the above reaction solution is centrifuged and cleaned with acetone and n-hexane for 5 times to obtain fcc phase FePt nanoparticles.

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

Embodiment 2

[0047] 2.1 Take platinum acetylacetonate (Pt(acac) 2 ) 0.1g, 0.8ml of oleylamine and 0.8ml of oleic acid are dissolved in 10ml of 1-octadecene, fully stirred, 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, use a disposable syringe to inject the above A solution to obtain a mixed solution B, and then heat the solution B to 300°C for 10 minutes under the protection of nitrogen. After the reaction is completed, the above reaction solution is centrifuged and cleaned with acetone and n-hexane for 5 times to obtain fcc phase FePt nanoparticles.

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

Embodiment 3

[0056] 3.1 Take platinum acetylacetonate (Pt(acac) 2 ) 0.1g, 0.8ml of oleylamine and 0.8ml of oleic acid are dissolved in 10ml of 1-octadecene, fully stirred, 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, use a disposable syringe to inject the above A solution to obtain a mixed solution B, and then heat the solution B to 300°C for 10 minutes under the protection of nitrogen. After the reaction is completed, the above reaction solution is centrifuged and cleaned with acetone and n-hexane for 5 times to obtain fcc phase FePt nanoparticles.

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

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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 nano-particle-based anisotropic two-phase composite magnet and a preparation method thereof, and belongs to the field of novel nano-composite magnets. Background technique [0002] Permanent magnetic materials are an important class of functional materials, and various functional devices made on the basis of permanent magnetic materials play an irreplaceable role in people's production and life. Maximum magnetic energy product (BH) max It is one of the most important performance indicators of permanent magnet materials. Increasing the maximum magnetic energy product can bring huge economic and environmental benefits. However, in recent years, single-phase permanent magnetic materials (such as SmCo 5 , Sm 2 Co 17 And the development of NdFeB) has entered a bottleneck period. 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 i...

Claims

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Application Information

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Patent Type & Authority Applications(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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