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Method for preparing multilayer hollow metal microspheres for electromagnetic wave absorbing material

A technology of hollow metal microspheres and absorbing materials, applied in the direction of electrical components, magnetic field/electric field shielding, etc., can solve the problem of Fe or Co hollow microspheres not being successful, and achieve the effect of reducing the thickness of the wave-absorbing layer

Inactive Publication Date: 2011-01-12
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, fabrication of Fe or Co hollow microspheres using a similar process has been unsuccessful

Method used

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  • Method for preparing multilayer hollow metal microspheres for electromagnetic wave absorbing material
  • Method for preparing multilayer hollow metal microspheres for electromagnetic wave absorbing material
  • Method for preparing multilayer hollow metal microspheres for electromagnetic wave absorbing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1 Ni-Co 1-x Fe x , x=0.1 double-layer hollow microsphere

[0049] The synthesis of hollow Ni spheres adopts an autocatalytic reduction process, and nickel sulfate and sodium hydroxide solution are used as starting materials to obtain [Ni(OH) 2 ]colloid. Ni hollow spheres can be synthesized by mixing sodium hypophosphite solution and colloid. The detailed process is as follows:

[0050] 20 g NiSO 4 ·7H 2 O and 24.2 g NaH 2 PO 2 2H 2 O were dissolved in 200 ml distilled water respectively. The solution was heated at 90°C for 30 minutes, then the nickel sulfate solution and the sodium hydroxide solution were mixed, NiSO 4 The molar ratio with NaOH is 1:1, stir to obtain light green colloidal Ni(OH) 2 solution. NaH 2 PO 2 Add Ni(OH) to the solution 2 solution, stirred, and reacted for 5 minutes to obtain gray-black powder. The powder was rinsed several times with distilled water, then heated to 90°C with an electric hot plate and dried for 1 hour.

...

Embodiment 2

[0053] Example 2 Ni-Co 1-x Fe x (x=0.2) double-layer hollow microspheres

[0054] The synthesis of hollow Ni spheres adopts an autocatalytic reduction process, and nickel sulfate and sodium hydroxide solution are used as starting materials to obtain [Ni(OH) 2 ]colloid. Ni hollow spheres can be synthesized by mixing sodium hypophosphite solution and colloid. The detailed process is as follows:

[0055] 20 g NiSO 4 ·7H 2 O and 24.2 g NaH 2 PO 2 2H 2 O were dissolved in 200 ml distilled water respectively. The solution was heated at 90°C for 30 minutes, then the nickel sulfate solution and the sodium hydroxide solution were mixed, NiSO 4 The molar ratio with NaOH is 1:1, stir to obtain light green colloidal Ni(OH) 2 solution. NaH 2 PO 2 Add Ni(OH) to the solution 2 solution, stirred, and reacted for 5 minutes to obtain gray-black powder. The powder was rinsed with distilled water, and then heated to 90°C with an electric hot plate and dried for 1 hour.

[0056] C...

Embodiment 3

[0058] Example 3 Ni-Co 1-x Fe x (x=0) hollow microsphere

[0059]The synthesis of hollow Ni spheres adopts an autocatalytic reduction process, and nickel sulfate and sodium hydroxide solution are used as starting materials to obtain [Ni(OH) 2 ]colloid. Ni hollow spheres can be synthesized by mixing sodium hypophosphite solution and colloid. The detailed process is as follows:

[0060] 20 g NiSO 4 ·7H 2 O and 24.2 g NaH 2 PO 2 2H 2 O were dissolved in 200 ml distilled water respectively. The solution was heated at 90°C for 30 minutes, then the nickel sulfate solution and the sodium hydroxide solution were mixed, NiSO 4 The molar ratio with NaOH is 1:1, stir to obtain light green colloidal Ni(OH) 2 solution. NaH 2 PO 2 Add Ni(OH) to the solution 2 solution, stirred, and reacted for 5 minutes to obtain gray-black powder. The powder was rinsed with distilled water, then heated to 90°C with an electric hot plate and dried for 1 hour.

[0061] Co thin film coatings ...

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Abstract

The invention discloses a method for preparing multilayer hollow metal microspheres for an electromagnetic wave absorbing material. The microspheres are prepared by a method of combining autocatalytic reduction reaction and chemical plating process. Inner-layer hollow Ni spheres are obtained by adopting the autocatalytic reduction reaction; and a single-layer or multilayer Co or Fe metal or Co1-xFex alloy film is coated on the surface of the Ni hollow spheres by chemical plating, and the thickness is adjustable. The obtained multilayer hollow microspheres have high magnetization intensity, and the density is less than 3.0g / cm<3>. The electromagnetic wave absorbing material meets the requirement of high-frequency electromagnetic wave absorption, and meanwhile has the characteristics of light weight and thin layer.

Description

technical field [0001] The invention relates to an electromagnetic wave absorbing magnetic material, in particular to a preparation method of a multilayer hollow metal microsphere used for the electromagnetic wave absorbing material. Background technique [0002] Electromagnetic wave absorbing materials play a very important role in national defense and civilian fields such as military and security protection. According to the concept of electromagnetic physics, when an electromagnetic wave (plane wave) propagates from free space to a medium (absorbing material) layer, its normalized input impedance is given by Z in = Z 0 (μ / ε) 1 / 2 tanh[j(2π / λ)(με) 1 / 2 t] is given, where Z 0 is the impedance of free space, μ=μ′-jμ″ is the complex magnetic permeability of the material, where: μ′ is the real part, which means the magnetic storage characteristics of the material; μ″ is the imaginary part, which means the magnetic loss of the material; ε=ε ′-jε″ is the complex permittivity ...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/02C23C18/31H05K9/00
Inventor 刘仲武曾德长
Owner SOUTH CHINA UNIV OF TECH
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