Preparation method of nano barium titanate/ferroferric oxide hybrid material with high wave-absorbing performance

A technology of triiron tetroxide and hybrid materials, applied in the directions of iron oxide/iron hydroxide, chemical instruments and methods, titanate, etc., can solve the problem of narrow absorption frequency band, unsatisfactory wave absorption performance of pure barium titanate, cost Advanced problems, to achieve the effect of reducing direct reflection

Active Publication Date: 2021-08-31
东北大学秦皇岛分校
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] BaTiO 3 and Fe 3 o 4 All belong to the traditional coating absorbing materials, which have many advantages such as simple preparation method and cheap raw materials, but at the same time they also have disadvantages such as narrow absorption frequency band and low absorption intensity.
BaTiO 3 It is a kind of dielectric material, but the microwave absorption performance of unmodified pure barium titanate is not ideal
Fe 3 o 4 It is a kind of magnetic loss material. Ferrite is a more researched and mature absorbing material. Its advantages are high absorption efficiency, thin coating, and wide frequency band. The disadvantage is that the relative density increases the weight of components. As a result, the overall performance of the components is affected, and the high-frequency effect is not ideal
[0004] Including some of the prior art using piezoelectric properties and electromagnetic wave absorption properties, the BaTiO 3 and Fe 3 o 4 Nanoparticles dispersed into PAN solution to obtain BaTiO 3 / Fe 3 o 4 / PAN spinning liquid, and then carry out electrospinning, and in order to meet the electromagnetic shielding and can be widely used, spinning preparation 1. The cost is too high, the process is unstable, and the needles are easy to block when PAN is mass-produced, and the efficiency is low and not environmentally friendly. 2. The size is large, the particles are unevenly distributed on the silk, and the efficiency is low. 3. The materials prepared by the spinning method need to be sintered, which is easy to cause environmental protection and energy consumption problems

Method used

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  • Preparation method of nano barium titanate/ferroferric oxide hybrid material with high wave-absorbing performance
  • Preparation method of nano barium titanate/ferroferric oxide hybrid material with high wave-absorbing performance
  • Preparation method of nano barium titanate/ferroferric oxide hybrid material with high wave-absorbing performance

Examples

Experimental program
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Effect test

Embodiment 1

[0082] Weigh 4.0g NaOH into a beaker, then add 10ml of water first, and then add 10ml of absolute ethanol after the NaOH is dissolved in the water. Then 2.3319g nano BaTiO 3 Add absolute ethanol to the powder and grind it into a slurry, pour it into the above beaker, and then add 100ml of absolute ethanol. Put the above beaker into a magnetic stirrer with the temperature set at 70 °C. 1.9881g FeCl 2 4H 2 O and 2.7030 g FeCl 3 ·6H 2 O was dissolved in 60ml of absolute ethanol, and the solution was added to the burette, and added dropwise to the above emulsion through the burette, stirring continuously. After all the solutions are added, let stand, separate layers, pour off the supernatant, add water, after standing still, pour off the supernatant again, and repeat this step three times (stand and separate at room temperature, no aging is required). After five times of suction filtration, it was placed in a drying oven at a temperature of 60° C. for 24 hours to obtain a br...

example 1

[0094] The magnetic stirrer in the example 1 only turns on the heating switch, and the rotating speed is adjusted to 0rmp, and an electric stirrer is used above.

Embodiment 2

[0096] Nano BaTiO used 3 The powder is the same as in Example 1, and the nano-BaTiO obtained by the solution direct synthesis method is earlier 3 Powder. Weigh 4.0g NaOH into a beaker, then add 10ml of water first, and then add 10ml of absolute ethanol after the NaOH is dissolved in the water. Then 4.6638g nanometer BaTiO 3 Add absolute ethanol to the powder and grind it into a slurry, pour it into the above beaker, and then add 100ml of absolute ethanol. Put the above beaker into a magnetic stirrer with the temperature set at 70 °C. 1.9981g FeCl 2 4H 2 O and 2.7030 g FeCl 3 ·6H 2 O was dissolved in 60ml of absolute ethanol, and the solution was added to the burette, and added dropwise to the above emulsion through the burette, stirring continuously. After all the solutions are added, let stand, separate layers, pour off the supernatant, add water, after standing still, pour off the supernatant again, and repeat this step three times (stand and separate at room tempera...

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Abstract

The invention relates to a preparation method of a nano barium titanate / ferroferric oxide hybrid material with high wave-absorbing performance. According to the preparation method, nano Fe3O4 particles are directly deposited on the surface of nano BaTiO3 in situ in a solution to form hybrid material powder, nano Fe3O4 forms surface contact on the surface of nano BaTiO3 to generate a large number of interfaces, and due to the fact that a large number of defects and ions are accumulated on the two sides of the interfaces to form electromagnetic wave barriers, electromagnetic waves of all frequency bands are strongly absorbed and scattered. After the powder is formed, the hybrid material has very high electrical loss and magnetic loss. When the the frequency is 20 Hz-3 GHz, the dielectric constant is 10-1000, and the electrical loss is 0.1-44.3; when the frequency is 10 Hz-1 GHz, the magnetic conductivity is 3.69-9.5, and the magnetic loss is 6.7-15.9; and when the thickness of the hybrid material is 2 mm, the reflectivity of the hybrid material at 2 GHz ranges from-9.84 dB to-29.4 dB, and the absorptivity ranges from 89.62% to 99.89%. The nano barium titanate / ferroferric oxide hybrid material has good electromagnetic wave absorption performance, and is especially suitable for being used as a wave-absorbing material or an electromagnetic shielding material.

Description

Technical field: [0001] The invention belongs to the technical field of preparation of wave-absorbing materials and electromagnetic shielding materials, and in particular relates to a method for preparing a nano barium titanate / ferric oxide hybrid material with high wave-absorbing performance. Background technique: [0002] Absorbing materials refer to a class of materials that can absorb electromagnetic wave energy projected onto its surface, and convert electromagnetic wave energy into heat energy or other forms of energy through the dielectric loss of the material. Generally, it is composed of matrix material and absorbent. According to the absorbing mechanism, absorbing materials can be divided into two types: electric loss type and magnetic loss type: electric loss type absorbing materials mainly absorb and attenuate electromagnetic waves through the electronic polarization, ion polarization and interface polarization of the medium; Lossy absorbing materials mainly abs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00C01G23/00C01G49/08B82Y30/00B82Y40/00
CPCH05K9/0081C01G23/006C01G49/08B82Y40/00B82Y30/00C01P2004/80C01P2002/72C01P2004/03C01P2004/64
Inventor 谢雨希齐建全韩鹏于天池厉正琴管彤孙海波李煜李宏峰韩秀梅
Owner 东北大学秦皇岛分校
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