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ZnO/Fe/Fe3C/C (zinc oxide/iron/iron carbide/carbon) composite electromagnetic wave absorbent and preparation method thereof

A technology of composite electromagnetic and electromagnetic wave absorption, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of ternary and multi-element composite material performance research, complex preparation process, and ambiguous relationship, etc., to achieve excellent wave absorption The effect of performance, simple process, and absorption frequency bandwidth

Active Publication Date: 2017-09-29
江苏万华拓谷新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many shortcomings in the existing technology: 1. There is still a lot of room for improvement in the performance of the absorbent, mainly because it needs to meet the low thickness (≤2mm) to achieve a wide effective absorption frequency band (≥4GHz); 2. The preparation process Complex, time-consuming, low yield, and most of them use highly toxic organic solvents; 3. The current absorbents are mainly binary composite materials, and there are very few studies on the performance of ternary and multi-component composite materials, and the properties of each component and the electromagnetic parameters The relationship between

Method used

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  • ZnO/Fe/Fe3C/C (zinc oxide/iron/iron carbide/carbon) composite electromagnetic wave absorbent and preparation method thereof
  • ZnO/Fe/Fe3C/C (zinc oxide/iron/iron carbide/carbon) composite electromagnetic wave absorbent and preparation method thereof
  • ZnO/Fe/Fe3C/C (zinc oxide/iron/iron carbide/carbon) composite electromagnetic wave absorbent and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] ZnO / Fe / Fe of the present invention 3 The preparation method of C / C porous composite electromagnetic wave absorbing agent comprises the following steps:

[0031] Step 1: Add 2.16g iron acetylacetonate, 1.67g zinc nitrate, 0.34g terephthalic acid and 7.2g PVP (K29-K32) to 300mL N,N-dimethylformamide and 180mL ethanol mixed solvent, completely dissolve Afterwards, reflux at 100°C for 6h; the product was washed by centrifugation and dried to obtain the precursor Fe III -MOF-5;

[0032] Step 2: Precursor powder in N 2 In the atmosphere, the temperature was raised to 600°C at a rate of 5°C / min and kept for 2 hours. After natural cooling, ZnO / Fe / Fe 3 C / C composite material, marked as ZFC-600.

Embodiment 2

[0034] ZnO / Fe / Fe of the present invention 3 The preparation method of C / C porous composite electromagnetic wave absorbing agent comprises the following steps:

[0035] Step 1: Add 2.16g iron acetylacetonate, 1.67g zinc nitrate, 0.34g terephthalic acid and 7.2g PVP (K29-K32) to 300mL N, N-dimethylformamide and 180mL ethanol mixed solvent, after completely dissolving , refluxed at 100°C for 6h; the product was washed by centrifugation and dried to obtain the precursor Fe III -MOF-5;

[0036] Step 2: Put the precursor powder in N 2 In the atmosphere, the temperature was raised to 650°C at a rate of 5°C / min and kept for 2 hours. After natural cooling, ZnO / Fe / Fe 3 C / C composite material, labeled ZFC-650.

Embodiment 3

[0038] ZnO / Fe / Fe of the present invention 3 The preparation method of C / C porous composite electromagnetic wave absorbing agent comprises the following steps:

[0039]Step 1: Add 2.16g iron acetylacetonate, 1.67g zinc nitrate, 0.34g terephthalic acid and 7.2g PVP (K29-K32) to 300mL N, N-dimethylformamide and 180mL ethanol mixed solvent, after completely dissolving , refluxed at 100°C for 6h; the product was washed by centrifugation and dried to obtain the precursor Fe III -MOF-5;

[0040] Step 2: Precursor powder in N 2 In the atmosphere, the temperature was raised to 700°C at a rate of 5°C / min and kept for 2 hours. After natural cooling, ZnO / Fe / Fe was obtained. 3 C / C composite material, labeled ZFC-700.

[0041] figure 1 For the X-ray diffraction spectrum of the composite absorbing material that the embodiment of the present invention 1,2,3 makes, from figure 1 It can be seen that the composite absorbing material only contains ZnO, Fe and Fe 3 The characteristic peak o...

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Abstract

The invention discloses a ZnO / Fe / Fe3C / C (zinc oxide / iron / iron carbide / carbon) composite electromagnetic wave absorbent, and also discloses a preparation method of the ZnO / Fe / Fe3C / C composite electromagnetic wave absorbent. The preparation method comprises the following steps of preparing FeIII-MOF-5 by a reflux method: adding reaction materials of ferric acetylacetonate, zinc nitrate, terephthalic acid and PVP (polyvinyl pyrrolidone) into a mixed solvent of N,N-dimethylformamide and ethyl alcohol, completely dissolving, and refluxing at certain temperature; centrifuging, washing and drying a product after reaction, so as to obtain a precursor FeIII-MOF-5; calcining the precursor product under the inertia environment at the temperature of 550 to 750 DEG C, so as to obtain a final product. The porous composite electromagnetic wave absorbent has the characteristics that the absorbing strength is high at low thickness, and the frequency band of effective absorbing is broad; the excellent wave absorbing property is realized. The preparation method has the advantages that the technology is simple, the cost is low, the complicated synthesizing equipment is not needed, and the hypertoxic organic solvent is not needed.

Description

technical field [0001] The present invention relates to a kind of ZnO / Fe / Fe 3 C / C composite electromagnetic absorber, also related to the above-mentioned ZnO / Fe / Fe 3 The invention discloses a preparation method of a C / C composite electromagnetic wave absorbing agent, which belongs to the technical field of microwave absorbing materials. Background technique [0002] With the rapid development of modern electronic information technology, all kinds of electronic and electrical equipment bring great convenience to people's daily life and scientific and technological research, but also produce serious electromagnetic pollution to the environment. On the one hand, electromagnetic pollution will affect the normal physiological activities of humans and organisms, and on the other hand, it will also cause great interference to the normal operation of electronic equipment. In addition, in the military field, the stealth capability of weapons and equipment has increasingly become th...

Claims

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Application Information

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IPC IPC(8): C09K3/00
Inventor 姬广斌刘伟柳磊陈家彬
Owner 江苏万华拓谷新材料科技有限公司
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