A kind of ferrosilicate/ferrite composite wave absorbing agent and preparation method thereof

A technology of ferrite and sendust, which is applied in the design and preparation of composite wave absorbing agents, can solve the problems that affect the wave absorbing performance of powder absorbing materials, the service life of wave absorbing materials, and the inevitable oxidation and rust, so as to achieve impedance matching Good, low dielectric constant, easy to operate

Active Publication Date: 2020-01-14
SHANDONG NON METALLIC MATERIAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reaction of this invention in an aqueous solution will inevitably lead to oxidation and rusting of the FeSiAl powder, which will seriously affect the microwave-absorbing performance of the powder and the service life of the microwave-absorbing material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 100-150 mesh spherical ferrosilicon aluminum alloy powder (atomization method), absolute ethanol and stearic acid according to the mass ratio of 1:1:0.01, and add them to a stirring ball mill for ball milling. The ball milling medium is steel balls with a diameter of 4mm. Ratio 25:1, ball milling at 250r / min for 160min. After the ball milling is completed, the slurry is dried and sieved to remove the part with a particle size below 20 μm.

[0026] Mix M-type BaFe with a particle size of 15-30 μm at a mass ratio of 1:3.5 12 o 19 The ferrite powder and the sieved sendust powder form a mixed powder, and the sieved sendust and ferrite mixed powder, absolute ethanol and KH-550 are weighed at a mass ratio of 1:0.8:0.01 , added to a stirring ball mill to continue ball milling, the ball milling medium is steel balls with a diameter of 6mm, the ball-to-material ratio is also 25:1, and ball milling is continued at 345r / min for 25min. After the ball milling is completed, ...

Embodiment 3

[0034] According to the mass ratio of 1:0.8:0.02, weigh 110-160 mesh spherical ferrosilicon aluminum alloy powder (atomization method), absolute ethanol and stearic acid, and add them to the stirring ball mill for ball milling. The ball milling medium is steel balls with a diameter of 5mm. The material ratio is 23:1, and the ball mill is 140min at 270r / min. After the ball milling is completed, the slurry is dried and sieved to remove the part with a particle size below 20 μm.

[0035] Mix M-type BaFe with a particle size of 15-25 μm at a mass ratio of 1:4.5 12 o 19 Ferrite powder and sieved sendust powder, weigh the sieved sendust and ferrite mixed powder, absolute ethanol and KH-550 according to the mass ratio of 1:1.1:0.03, add to stirring Continue ball milling in the type ball mill, the ball milling medium is steel balls with a diameter of 7 mm, the ball-to-material ratio is 27:1, and ball milling is performed at 335 r / min for 35 min. After the ball milling is completed,...

Embodiment 4

[0038] Weigh 120-160 mesh spherical ferrosilicon powder (atomization method), absolute ethanol and KH-550 according to the mass ratio of 1:0.9:0.02, and add them to the stirring ball mill for ball milling. The ball milling medium is steel balls with a diameter of 4 mm. The ball-to-material ratio is 22:1, and the ball mill is 140min at 280r / min. After the ball milling is completed, the slurry is dried and sieved to remove the part with a particle size below 20 μm.

[0039] Mix Z-type Ba with a particle size of 15-30 μm at a mass ratio of 1:5 3 (Zn 0.4 co 0.6 ) 2 Fe 24 o 41 Ferrite powder and sieved sendust powder, according to the mass ratio of 1:1.2:0.02, weigh the sieved sendust and ferrite mixed powder, absolute ethanol and KH-550, add to stirring Continue ball milling in the type ball mill, the ball milling medium is steel balls with a diameter of 7.5 mm, the ball-to-material ratio is 28:1, and ball milling is performed at 330 r / min for 40 min. After the ball milling...

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Abstract

The invention belongs to the technical field of functional materials. The ball milling process is adopted to make use of the shearing and high-efficiency impact between the ball milling media to coat the flaky hexagonal ferrite on the surface of the FeSiAl powder, and along the surface of the flaky FeSiAl powder. spread out. The sendust / ferrite composite wave absorbing agent involved in the present invention is a ferrite-coated FeSiAl flake powder with a thickness not greater than 2 μm, a particle size D(n, 50) ≥ 40 μm, and a bulk density of 1.0 to 1.5 g / cm 3 , prepared by wet ball milling process, the mass ratio of ferrite to sendust is between 1:1 and 1:6; prepared by wet ball milling process. The composite wave-absorbing agent involved in the invention has low dielectric constant, high magnetic permeability and good impedance matching, can effectively broaden the wave-absorbing frequency band of the sendust wave-absorbing material, and is suitable for wave-absorbing materials in all frequency bands of 1GHz to 12GHz.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and relates to the design and preparation technology of wave absorbing agents, in particular to the design and preparation technology of composite wave absorbing agents. Background technique [0002] Sensitivity aluminum alloy has high saturation magnetization, low eddy current loss, and its natural resonance frequency is adjustable from MHz to GHz. It is an important low-frequency electromagnetic wave absorber, but it has a relatively high relative permeability, which is not conducive to impedance matching. The problem. In order to reduce the dielectric constant, surface treatment is required to reduce the dielectric constant. Conventional treatment methods such as silane coupling agent coating can reduce the dielectric constant, but the magnetic permeability also decreases to a certain extent. This method cannot improve the dielectric constant very well. Impedance mismatch problem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02B22F1/00B22F9/08C09K3/00
Inventor 于名讯郭宇王明张塬昆王雯刘永峙刘玉凤张宝芹黄成亮邱桂花潘士兵
Owner SHANDONG NON METALLIC MATERIAL RES INST
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