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A kind of preparation method of graphene/y3fe5o12/cofe2o4 wave-absorbing material

A technology of y3fe5o12 and wave-absorbing materials, which is applied in the field of wave-absorbing materials, achieves the effects of simple preparation process, high dielectric loss, and improved wave-absorbing performance

Active Publication Date: 2018-09-18
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In 2013, Wang et al prepared BaFe by reduction technique 12 o 19 -Ni 0.8 Zn 0.2 Fe 2 o 4 / graphene nanocomposite material and studied its absorbing performance, but the maximum absorbing reflection loss of the prepared absorbing material can only reach -19.63dB

Method used

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  • A kind of preparation method of graphene/y3fe5o12/cofe2o4 wave-absorbing material
  • A kind of preparation method of graphene/y3fe5o12/cofe2o4 wave-absorbing material
  • A kind of preparation method of graphene/y3fe5o12/cofe2o4 wave-absorbing material

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Experimental program
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Embodiment 1

[0028] Graphene / Y of the present embodiment 3 Fe 5 o 12 / CoFe 2 o 4 Absorbing material, its formula is 0.3Y 3 Fe 5 o 12 +0.7CoFe 2 o 4 (The ratio of the two ferrites is based on mass percentage), graphene and 0.3Y 3 Fe 5 o 12 / 0.7CoFe 2 o 4 The mass ratio is 1:5.

[0029] Step 1: firstly, the preparation of graphite oxide; 2g natural graphite sheet, 2g NaNO 3 , 96 ml concentrated H 2 SO 4 Soak in a beaker of ice water, then add 12g KMnO 4 Slowly add to the above mixture. The above solvent was transferred to a water tank at 35°C and stirred for two hours until a thick slurry was formed. Slowly add 80 ml of distilled water into the thick slurry above, and stir for 30 minutes until the temperature rises to 90°C (control the temperature in the water tank to rise to 90°C). Finally, 200ml H 2 O, 10ml H 2 o 2 Slowly add the solvent until the solvent color changes from dark brown to yellow. The graphite oxide precipitate is separated from the graphite oxide susp...

Embodiment 2

[0033] Graphene / Y of the present embodiment 3 Fe 5 o 12 / CoFe 2 o 4 Absorbing material, its formula is 0.3Y 3 Fe 5 o 12 +0.7CoFe 2 o 4 (The ratio of the two ferrites is based on mass percentage), graphene and 0.3Y 3 Fe 5 o 12 / 0.7CoFe 2 o 4 The mass ratio is 1:5.

[0034] Step 1: First, the preparation of graphite oxide; 4g natural graphite flakes, 4g NaNO 3 , 192ml concentrated H 2 SO 4 Put into a beaker soaked in ice water, then add 24g KMnO 4 Slowly add to the above mixture. The above solvent was transferred to a water tank at 35°C and stirred for two hours until a thick slurry was formed. Slowly add 160ml of distilled water into the above thick slurry, stir for 30min until the temperature rises to 90°C. Finally, 400ml H 2 O, 30ml H 2 o 2 Slowly add the solvent until the solvent color changes from dark brown to yellow. The graphite oxide precipitate is separated from the graphite oxide suspension by high-speed centrifugation, washed repeatedly with de...

Embodiment 3

[0044] Graphene / Y of the present embodiment 3 Fe 5 o 12 / CoFe 2 o 4 Absorbing material, its formula is 0.3Y 3 Fe 5 o 12 +0.7CoFe 2 o 4 (The ratio of the two ferrites is based on mass percentage), graphene and 0.3Y 3 Fe 5 o 12 / 0.7CoFe 2 o 4 The mass ratio is 1:5.

[0045] Step 1: First, the preparation of graphite oxide; 20g natural graphite flakes, 20g NaNO 3 , 960ml concentrated H 2 SO 4 Put into a beaker soaked in ice water, then add 120g KMnO 4 Slowly add to the above mixture. The above solvent was transferred to a water tank at 35°C and stirred for two hours until a thick slurry was formed. Slowly add 800ml of distilled water into the above thick slurry, stir for 30min until the temperature rises to 90°C. Finally, 2000ml H 2 O, 100ml H 2 o 2 Slowly add the solvent until the solvent color changes from dark brown to yellow. The graphite oxide precipitate is separated from the graphite oxide suspension by high-speed centrifugation, washed repeatedly wi...

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Abstract

The invention discloses a preparation method of a graphene / Y3Fe5O12 / CoFe2O4 wave-absorbing material. The preparation method comprises the following steps: firstly, separately preparing Y3Fe5O12 and CoFe2O4 by a sol-gel in-situ composite method; compounding two ferrite powder by a physical mixing method according to the mass ratio being 3 to 7 to obtain Y3Fe5O12 / CoFe2O4 composite powder; secondly, preparing the graphene / Y3Fe5O12 / CoFe2O4 wave-absorbing material: mixing graphene with the Y3Fe5O12 / CoFe2O4 composite powder according to the mass ratio being 1 to 5; reducing the graphene by a chemical oxidative polymerization method, and enabling the graphene to have high conductivity; in addition, by use of the method, an isomerization reaction can be reduced, and further graphene / Y3Fe5O12 / CoFe2O4 composite powder is prepared. The graphene / Y3Fe5O12 / CoFe2O4 wave-absorbing material prepared by the method disclosed by the invention has the characteristics that electromagnetic waves and functional materials with relatively-small scattering, reflecting and transmission effects can be absorbed; the graphene / Y3Fe5O12 / CoFe2O4 wave-absorbing material has wide absorption frequency band, lighter weight, thinner thickness, higher mechanical property, simplicity and easiness in operation in the application process, and the like.

Description

technical field [0001] The invention relates to the field of wave-absorbing materials, in particular to a graphene / Y 3 Fe 5 o 12 / CoFe 2 o 4 Preparation method of absorbing material. Background technique [0002] Microwave absorbing materials are functional materials that can absorb electromagnetic waves, and have relatively small scattering, reflection, and transmission effects. High mechanical properties and simple and easy handling in the application process, but existing materials are difficult to meet these requirements at the same time. [0003] With the development of modern science and technology and the rapid improvement of the global economic and cultural level, it is difficult for a single material to meet people's needs. Materials are required not only to be miniaturized and integrated, but also to be multifunctional. Based on a large number of studies on single-phase ferrite materials, it has been found that compounding two kinds of ferrite materials can i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 蒲永平王亚茹师裕
Owner SHAANXI UNIV OF SCI & TECH