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Preparation method of aluminum phosphate-coated carbonyl iron anti-oxidation wave-absorbing material

A technology for coating carbonyl iron and absorbing materials with aluminum phosphate, applied in carbonyl iron, chemical instruments and methods, phosphorus compounds, etc. Poor matching and other problems, to achieve the effect of improving electromagnetic parameters, improving thermal stability, and good oxidation resistance

Active Publication Date: 2019-02-26
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, carbonyl iron has a high density, the volume of the absorbent is large, and the permittivity is much larger than the magnetic permeability, resulting in poor impedance matching of the material; in addition, there is a strong interaction between carbonyl iron metal particles. Under the action of the self-generated magnetic field, it is easy to agglomerate, and the interaction with the incident electromagnetic wave will form a strong eddy current, and the large eddy current will cause the skin effect; Oxidation reaction of oxygen in the carbonyl iron, especially under high temperature conditions, will inevitably reduce the absorbing performance of carbonyl iron
In recent years, the research on carbonyl iron is mainly to improve the microwave absorption performance of carbonyl iron by designing and synthesizing some carbonyl iron composite materials, but so far, few studies have aimed at overcoming the shortcoming of carbonyl iron being easily oxidized and improving the thermal stability of carbonyl iron However, this still limits the further application of carbonyl iron at high temperature to a certain extent.

Method used

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  • Preparation method of aluminum phosphate-coated carbonyl iron anti-oxidation wave-absorbing material
  • Preparation method of aluminum phosphate-coated carbonyl iron anti-oxidation wave-absorbing material
  • Preparation method of aluminum phosphate-coated carbonyl iron anti-oxidation wave-absorbing material

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Experimental program
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Effect test

Embodiment 1

[0035] 1. Add 5.67g of carbonyl iron powder into 100mL of solution and sonicate for 1h (solution 1). In order to prevent carbonyl iron from depositing in water, it is necessary to shake the beaker at intervals during the ultrasonic process to form carbonyl iron and water. homogeneous suspension;

[0036] Two, take by weighing 0.92g aluminum salt and 0.30g hydrogen phosphate di-salt and dissolve in 150mL of deionized water, mechanically stir until forming a white suspension (solution 2), wherein the mass ratio of soluble aluminum salt and hydrogen phosphate di-salt is 3:1;

[0037] 3. Pour the above solution 1 into solution 2 and stir to make it evenly mixed, then transfer the beaker containing the mixed solution to a water bath at 80°C and continue mechanical stirring until the solution evaporates to a viscous substance, and the obtained crude product Use distilled water and ethanol to carry out ultrasonic magnetic separation washing respectively, until the upper liquid is cl...

Embodiment 2

[0042] 1. Add 5.67g of carbonyl iron powder into 100mL of solution and sonicate for 1h (solution 1). In order to prevent carbonyl iron from depositing in water, it is necessary to shake the beaker at intervals during the ultrasonic process to form carbonyl iron and water. homogeneous suspension;

[0043] 2. Weigh 1.89g of aluminum salt and 0.63g of hydrogen phosphate di-salt and dissolve them in 150mL of deionized water, and mechanically stir until a white suspension (solution 2) is formed. The mass ratio of soluble aluminum salt to hydrogen phosphate di-salt 3:1;

[0044] 3. Pour the above solution 1 into solution 2 and stir to make it evenly mixed, then transfer the beaker containing the mixed solution to a water bath at 80°C and continue mechanical stirring until the solution evaporates to a viscous substance, and the obtained crude product Use distilled water and ethanol to carry out ultrasonic magnetic separation washing respectively, until the upper liquid is clear afte...

Embodiment 3

[0047]1. Add 5.67g of carbonyl iron powder into 100mL of solution and sonicate for 1h (solution 1). In order to prevent carbonyl iron from depositing in water, it is necessary to shake the beaker at intervals during the ultrasonic process to form carbonyl iron and water. homogeneous suspension;

[0048] 2. Weigh 4.26g of aluminum salt and 1.42g of hydrogen phosphate di-salt and dissolve them in 150mL of deionized water, and mechanically stir until a white suspension (solution 2) is formed. The mass ratio of soluble aluminum salt to hydrogen phosphate di-salt 3:1;

[0049] 3. Pour the above solution 1 into solution 2 and stir to make it evenly mixed, then transfer the beaker containing the mixed solution to a water bath at 80°C and continue mechanical stirring until the solution evaporates to a viscous substance, and the obtained crude product Use distilled water and ethanol to carry out ultrasonic magnetic separation washing respectively, until the upper liquid is clear after...

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Abstract

The invention relates to a preparation method of an aluminum phosphate clad carbonyl iron anti-oxidation wave-absorbing material, which solves the problems that the activity among carbonyl iron metal particles is high, and carbonyl iron metal particles and oxygen in the air easily have oxidation reaction. The preparation method comprises the following steps: (1) preparing a precursor carbonyl iron suspension; (2) preparing a phosphate suspension; (3) pouring the phosphate suspension into the precursor carbonyl iron suspension, mixing and reacting and cleaning and separating; and (4) performing high-temperature calcination on a sample under the inert atmosphere condition to obtain an aluminum phosphate clad carbonyl iron (Fe@AlPO4) composite material. The obtained composite material can well keep the basic skeleton and crystal form of the precursor carbonyl iron, the oxidization reaction of internal material iron with oxygen in the air can be delayed under the condition of certain temperature air, and the thermal stability of the carbonyl iron composite material can be enhanced. The electromagnetic parameters of the composite material can be regulated by modification of phosphate, the impedance of the composite material is beneficially better matched, and the wave absorbing performance of the composite material can be improved; in addition, the composite material can still keep better wave absorbing performance after being subjected to thermal treatment in the air for 24h and 48h.

Description

technical field [0001] The invention relates to a preparation method of an aluminum phosphate-coated carbonyl iron anti-oxidation wave-absorbing material, and belongs to the technical field of a preparation method of an anti-oxidation wave-absorbing material. Background technique [0002] As a traditional magnetic metal material, carbonyl iron has the characteristics of high purity and fine particle size, high saturation magnetization, low cost, mature technology and practical application, so it has been widely used in the field of commercial electromagnetic wave absorbing materials. However, carbonyl iron has a high density, the volume of the absorbent is large, and the permittivity is much larger than the magnetic permeability, resulting in poor impedance matching of the material; in addition, there is a strong interaction between carbonyl iron metal particles. Under the action of the self-generated magnetic field, it is easy to agglomerate, and the interaction with the in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/16C01B25/36C09K3/00
CPCC01B25/36C01G49/16C01P2002/72C01P2004/03C01P2004/04C01P2004/61C01P2004/80C01P2006/40C01P2006/42C09K3/00
Inventor 韩喜江段文菊杜耘辰
Owner HARBIN INST OF TECH
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