Wave-absorbing material and preparation method thereof

A technology of microwave-absorbing materials and carbonyl iron powder, which is applied in the field of microwave-absorbing materials, can solve problems such as limiting the practical application range of carbonyl iron powder, large eddy current effects, and increasing the density of microwave-absorbing materials, so as to achieve electromagnetic parameters and microwave-absorbing performance , reduce the dielectric constant, improve the effect of impedance matching

Inactive Publication Date: 2013-11-20
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

like figure 1 As shown, most of the carbonyl iron powders in industrial applications are spherical particles with a peculiar "onion head" microstructure (this form of carbonyl iron powder can be called conventional carbonyl iron powder); it not only has a high It has high magnetic permeability and good saturation magnetization, and it also has the characteristics of low price and high industrial production efficiency; however, because carbonyl iron powder has the characteristics of soft magnetic materials, it also has high density, easy oxidation, high dielectric constant, eddy current The disadvantages such as large effect, so this greatly limits the practical appli

Method used

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  • Wave-absorbing material and preparation method thereof
  • Wave-absorbing material and preparation method thereof
  • Wave-absorbing material and preparation method thereof

Examples

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Example Embodiment

[0034] (1) A preparation method of absorbing material

[0035] Such as figure 2 As shown, a method for preparing a microwave absorbing material may specifically include the following steps:

[0036] Step A: Put conventional carbonyl iron powder into a ball mill for ball milling, thereby obtaining flake carbonyl iron powder.

[0037] Specifically, this step A may include the following steps:

[0038] Step A1. Prepare a mixture of conventional carbonyl iron powder and anhydrous ethanol in a weight ratio of 1:2~1:3; among them, conventional carbonyl iron powder should preferably use conventional carbonyl iron powder with a particle size of 0.5-8μm Iron powder, its microscopic appearance can be like figure 1 Shown.

[0039] Step A2. Put the prepared mixture into a ball mill, the weight ratio of the balls is 5:1-10:1, the speed of the ball mill is 400-500rpm, and the flake carbonyl iron powder is obtained after 4-8 hours of ball milling; , The ball in the ball mill is preferably corundum ...

Example Embodiment

[0051] Example one

[0052] A method for preparing a microwave absorbing material may specifically include the following steps:

[0053] Step 1. Put 30g as figure 1 The conventional form of carbonyl iron powder shown (the particle size of the conventional form of carbonyl iron powder is between 0.5-8μm) is mixed with 90ml of absolute ethanol, and placed in the spherical tank of the planetary ball mill; then put in the spherical tank Into corundum balls of different diameters, the weight ratio of the balls is 10:1, and the ball milled at 450 rpm for 6 hours can obtain flake carbonyl iron powder with a thickness of about 100 nm.

[0054] Step 2. Take 20g of the flake carbonyl iron powder obtained in step 1 above, and 170ml deionized water into the reactor, and then add solid sodium hydroxide to the reactor until the pH value in the reactor is equal to 12, thus A reaction system with a pH of 12 is formed.

[0055] Step 3. Let the reaction system formed in step 2 react at 170° C. for 6 h...

Example Embodiment

[0057] Example two

[0058] A preparation method of absorbing material. The difference from Example 1 is that the reaction system formed in step 2 is a reaction system with a pH value of 13 (the reaction system can be controlled by adjusting the amount of sodium hydroxide solid added) pH value); finally, flake carbonyl iron powder and ferroferric oxide composite absorbing material can be obtained.

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Abstract

The invention discloses a wave-absorbing material and a preparation method thereof. The preparation method comprises the following steps of putting carbonyl iron powder in a routine form into a ball mill, carrying out ball milling to obtain sheet-shaped carbonyl iron powder, adding the sheet-shaped carbonyl iron powder into a reactor, adding deionized water and sodium hydroxide solids into the reactor to obtain a reaction system having a pH value of 11-14, carrying out a reaction of the reaction system at a temperature of 150-190 DEG C for 4-8h, carrying out cooling to a room temperature, collecting the cooled reaction products by a magnet, and carrying out drying to obtain the sheet-shaped carbonyl iron powder-ferriferrous oxide composite wave-absorbing material. The preparation method improves impedance matching, keeps or improves a magnetic loss capability and inhibits the skin effect so that the wave-absorbing material has good wave-absorbing performances in a wide frequency range.

Description

technical field [0001] The invention relates to the field of wave-absorbing materials, in particular to a method for preparing a wave-absorbing material and the prepared wave-absorbing material. Background technique [0002] In recent years, absorbing materials have played an important role in military "stealth" technology, improving electromagnetic compatibility performance, preventing electromagnetic radiation, and preventing information leakage. For a wave-absorbing material, material quality, impedance matching, magnetic loss capability, and frequency range that can absorb electromagnetic waves are all key factors to measure the performance of the wave-absorbing material. [0003] At present, Carbonyl Iron Powder (CIP) is widely used as an important wave absorbing agent in the field of wave absorbing materials. Such as figure 1 As shown, most of the carbonyl iron powders in industrial applications are spherical particles with a peculiar "onion head" microstructure (thi...

Claims

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Application Information

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IPC IPC(8): C09K3/00
Inventor 刘强春戴建明邹键张敏孙玉平
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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