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Wave-absorbing powder material as well as preparation method and application thereof

A powder material, cobalt ferrite technology, applied in chemical instruments and methods, other chemical processes, inorganic chemistry, etc., can solve the problems of unsatisfactory application scenarios, lack of dielectric loss, high resistivity, etc., and achieve microwave absorption Excellent performance, simple preparation method, low density effect

Active Publication Date: 2021-08-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cobalt ferrite is a typical magnetic loss absorbing material, which has the advantages of high saturation magnetization, high coercive force, and high stability, and has a good application prospect. However, due to its high resistivity, high density, and The lack of defects such as dielectric loss cannot meet the complex application scenarios in various fields today

Method used

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  • Wave-absorbing powder material as well as preparation method and application thereof
  • Wave-absorbing powder material as well as preparation method and application thereof
  • Wave-absorbing powder material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A kind of wave-absorbing powder material, its preparation method comprises the following steps:

[0042] 1) 8.08g (0.02mol) of Fe(NO 3 ) 3 9H 2 O, 2.91g (0.01mol) of Co(NO 3 ) 2 ·6H 2 The hollow glass microspheres of O, 1.17g particle diameter 10 μm~50 μm and the monohydrate citric acid of 6.31g (0.031mol) add the deionized water of 50mL, stir evenly, then adjust pH to 7.2 with the ammoniacal liquor of mass fraction 25%, again Heat and stir in a water bath pot, the temperature of the water bath is 80°C, and the duration is 6h to obtain a viscous greasy sol, which is aged for 2h, then placed in an electric blast drying oven, dried at 120°C for 20h, and then transferred to the oxidation Put it in an aluminum crucible and put it into a muffle furnace, raise the temperature to 600°C at a rate of 5°C / min, keep it for 4h, then cool down to 200°C at a rate of 5°C / min, and then cool naturally to obtain a cobalt ferrite coating hollow glass microspheres;

[0043] 2) Add 0...

Embodiment 2

[0050] A kind of wave-absorbing powder material, its preparation method comprises the following steps:

[0051] 1) 8.08g (0.02mol) of Fe(NO 3 ) 3 9H 2 O, 2.91g (0.01mol) of Co(NO 3 ) 2 ·6H 2 The hollow glass microspheres of O, 1.17g particle diameter 10 μm~50 μm and the monohydrate citric acid of 6.31g (0.031mol) add the deionized water of 50mL, stir evenly, then adjust pH to 7.2 with the ammoniacal liquor of mass fraction 25%, again Heat and stir in a water bath pot, the temperature of the water bath is 80°C, and the duration is 6h to obtain a viscous greasy sol, which is aged for 2h, then placed in an electric blast drying oven, dried at 120°C for 20h, and then transferred to the oxidation Put it in an aluminum crucible and put it into a muffle furnace, raise the temperature to 600°C at a rate of 5°C / min, keep it for 4h, then cool down to 200°C at a rate of 5°C / min, and then cool naturally to obtain a cobalt ferrite coating hollow glass microspheres;

[0052]2) Add 0....

Embodiment 3

[0056] A kind of wave-absorbing powder material, its preparation method comprises the following steps:

[0057] 1) 8.08g (0.02mol) of Fe(NO 3 ) 3 9H 2 O, 2.91g (0.01mol) of Co(NO 3 ) 2 ·6H 2 The hollow glass microspheres of O, 1.17g particle diameter 10 μm~50 μm and the monohydrate citric acid of 6.31g (0.031mol) add the deionized water of 50mL, stir evenly, then adjust pH to 7.2 with the ammoniacal liquor of mass fraction 25%, again Heat and stir in a water bath pot, the temperature of the water bath is 80°C, and the duration is 6h to obtain a viscous greasy sol, which is aged for 2h, then placed in an electric blast drying oven, dried at 120°C for 20h, and then transferred to the oxidation Put it in an aluminum crucible and put it into a muffle furnace, raise the temperature to 600°C at a rate of 5°C / min, keep it for 4h, then cool down to 200°C at a rate of 5°C / min, and then cool naturally to obtain a cobalt ferrite coating hollow glass microspheres;

[0058] 2) Add 0...

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Abstract

The invention discloses a wave-absorbing powder material as well as a preparation method and application thereof. The wave-absorbing powder material comprises cobalt ferrite-iron cobalt alloy co-coated hollow glass beads and carbon microspheres, and the preparation method comprises the following steps: 1) dispersing soluble iron salt, soluble cobalt salt, hollow glass beads and citric acid in water, and carrying out a sol-gel reaction to obtain cobalt ferrite coated hollow glass beads; 2) dispersing the cobalt ferrite coated hollow glass beads and glucose in water, and performing hydrothermal reaction to obtain a ternary composite material; and 3) placing the ternary composite material in a protective atmosphere, and calcining. The wave-absorbing powder material has the advantages of low density, good stability, excellent wave-absorbing performance and the like, the preparation method is simple, raw materials are cheap and easy to obtain, and the wave-absorbing powder material is environmentally friendly and suitable for industrial large-scale production.

Description

technical field [0001] The invention relates to the technical field of functional materials, in particular to a wave-absorbing powder material and its preparation method and application. Background technique [0002] With the advancement of science and technology, great changes have taken place in people's lives and production methods. Electronic products such as mobile phones, computers, and tablets are used more and more widely, and they are inseparable from aerospace, communications, radio frequency identification, and electronic information. Turn on electronic equipment. However, the electromagnetic radiation produced by various daily electronic products and electronic equipment will not only cause irreversible damage to the human body, but also affect the normal operation and production accuracy of instruments and equipment. adverse effects. Therefore, how to solve the problem of electromagnetic radiation is one of the research priorities of countries all over the wor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00C03C17/23C01G51/00C01G49/00
CPCC09K3/00C03C17/23C01G51/00C01G49/0018
Inventor 刘平安岑思谨丁会玲
Owner SOUTH CHINA UNIV OF TECH