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a kind of hals-fe 3 o 4 @cComposite materials and their preparation methods and applications

A composite material and core material technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of poor electromagnetic matching, low applicable frequency band, high density, etc., and achieve the elimination of retroreflection, increase the probability of weakening, and high performance Effect

Inactive Publication Date: 2021-08-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the defects of low applicable frequency band, high density, and poor electromagnetic matching when ferroferric oxide is used alone as a magnetic dielectric type wave-absorbing material, the purpose of the present invention is to provide a HalS-Fe with excellent microwave absorption performance 3 o 4 @C Composite materials and their preparation methods and applications

Method used

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  • a kind of hals-fe <sub>3</sub> o <sub>4</sub> @cComposite materials and their preparation methods and applications
  • a kind of hals-fe <sub>3</sub> o <sub>4</sub> @cComposite materials and their preparation methods and applications
  • a kind of hals-fe <sub>3</sub> o <sub>4</sub> @cComposite materials and their preparation methods and applications

Examples

Experimental program
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Effect test

Embodiment 1

[0056] Take 50g of halloysite through a 200-mesh standard sieve and disperse it in 50mL of deionized water, prepare the halloysite powder into a suspension with a solid content of 30%, then add 1.5g of polyethylene glycol, ultrasonic for 30min, and magnetically After stirring for 2 hours, a cloudy solution was obtained. After stirring for 2 hours, the cloudy solution was spray-granulated in a drying tower at 200°C to obtain microspheres with an average particle size of 5 μm, which were calcined at 500°C for 2 hours.

[0057] Get calcined halloysite microspheres 0.05g, (NH 4 ) 2 FeSO 4 ·6H 2 O 0.322g, (NH 4 Fe(SO 4 ) 2 12H 2 (O) 0.793g into a three-necked flask, add 150ml of deionized water, stir and heat at a constant speed to 50°C, add 5ml of ammonia water drop by drop, react for 30min and then magnetically separate, wash 3 times with water, wash 3 times with ethanol, and return to 60°C Dry in a vacuum oven for 12h to obtain halloysite balls / Fe 3 o 4 . Take 0.1g of ...

Embodiment 2

[0059] Take 40g of halloysite through a 200-mesh standard sieve and disperse it in 60mL of deionized water, prepare the halloysite powder into a suspension with a solid content of 40%, then add 2g of sodium hexametaphosphate, sonicate for 30min, and stir magnetically at room temperature After 2 hours, a cloudy solution was obtained. After stirring for 2 hours, the cloudy solution was spray-granulated in a drying tower at 190°C to obtain microspheres with an average particle size of 5 μm, which were calcined at 600°C for 2 hours.

[0060] Get calcined halloysite microspheres 0.1g, (NH 4 ) 2 FeSO 4 ·6H 2 O 0.322g, (NH 4 Fe(SO 4 ) 2 12H 2 O) 0.793g into a three-necked flask, add 150ml of deionized water, stir and heat at a constant speed to 50°C, add 5ml of ammonia water drop by drop, react for 30min, then magnetically separate, wash 3 times with water, wash 3 times with ethanol, and return to 60°C Dry in a vacuum oven for 12h to obtain halloysite balls / Fe 3 o 4 . Take ...

Embodiment 3

[0064] According to the method of Example 1, the halloysite powder is prepared into a suspension and a turbid liquid with a solid content of 30%. After stirring for 2 hours, the liquid is sprayed and granulated in a drying tower at 180°C to obtain a powder with an average particle size of 5 μm. The microspheres were calcined at 700°C for 2h. Get calcined halloysite microspheres 0.2g, (NH 4 ) 2 FeSO 4 ·6H 2 O 0.322g, (NH 4 Fe(SO 4 ) 2 12H 2 O) 0.793g was put into a three-necked flask, stirred at a constant speed and heated to 50°C, and 5ml of ammonia water was added dropwise, reacted for 30 minutes, separated by magnetic force, washed 3 times with water and 3 times with ethanol, then dried in a vacuum oven at 60°C for 12 hours to obtain Halloy Ball / Fe 3 o 4 . Take 0.1g of the dried product and disperse it in a mixture containing 8ml of water, 3.2ml of ethanol and 0.04ml of ammonia water. After ultrasonic dispersion for 30min, add 0.06g of resorcinol and continue stirr...

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Abstract

The invention discloses a HalS-Fe 3 O 4 @C composite material and its preparation method and application, the composite material is composed of a core material and a cladding layer, the core material is halloysite microspheres loaded with ferric oxide on the surface, and the cladding layer is C. The preparation method is first to spray the halloysite raw ore powder to obtain the halloysite microspheres, then place the halloysite microspheres in the iron solution, and obtain the halloysite loaded with ferric oxide on the surface by the co-precipitation method Microspheres, and then resin-coated and carbonized to obtain HalS‑Fe 3 O 4 @C Composite. The composite material prepared by the invention has high magnetic saturation intensity, no residual magnetization intensity and coercive force, and exhibits typical paramagnetic properties. The preparation process of the invention is simple and convenient, and the prepared compound has excellent electromagnetic performance and good wave-absorbing performance.

Description

technical field [0001] The present invention relates to a kind of HalS-Fe 3 o 4 The @C composite material and its preparation method and application belong to the technical field of microwave absorbing materials. Background technique [0002] With the rapid development of contemporary science and technology, all kinds of daily electronic products, household appliances, industrial production and national defense medium and large electronic and electrical equipment (radar, radio transmission equipment, etc.) emerge in endlessly, with a wide variety, which are an indispensable part of life and production. While bringing convenience to people's daily life, it also promotes the continuous development of society. However, when these devices are used, they will release electromagnetic waves with different frequencies and different intensities. When the radiation exceeds the standard, it will cause serious electromagnetic interference in our living environment, seriously affecting...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 欧阳静杨华明贺子龙张毅傅梁杰刘赛男
Owner CENT SOUTH UNIV
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