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A method for preparing layered barium ferrite/rgo composite wave-absorbing material by casting method

A technology of composite wave-absorbing material and barium ferrite, which is applied in the direction of chemical instruments and methods, synthetic resin layered products, lamination, etc., can solve the problems of large particle size and unfavorable tape casting, and achieve low cost and favorable Tape casting, the effect of tight bonding between layers

Active Publication Date: 2018-08-07
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

Oriented BaFe synthesized by molten salt method 12 o 19 , so that the dominant crystal planes in the crystal structure are arranged in the same direction, thereby strengthening the isotropic properties of the dominant crystal planes, obtaining greater spontaneous polarization and magnetic properties in a certain characteristic direction, and improving its use value, but the particles The degree is large, which is not conducive to tape casting

Method used

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  • A method for preparing layered barium ferrite/rgo composite wave-absorbing material by casting method
  • A method for preparing layered barium ferrite/rgo composite wave-absorbing material by casting method
  • A method for preparing layered barium ferrite/rgo composite wave-absorbing material by casting method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Step 1: Put natural flake graphite, concentrated sulfuric acid with a mass fraction of 98%, and sodium nitrate in ice water in a weight ratio of 1:95:1.5, and stir evenly with magnetic force.

[0037] Then slowly add 12g of potassium permanganate three times, control the temperature at 0°C, and react for 90min. Heat to 35°C and react for 2h, slowly add 80mL of ultrapure water, the temperature rises to 100°C, keep warm for 2h, then stop heating. Among them, the quality of potassium permanganate is 4 times that of natural flake graphite, and the volume ratio of ultrapure water to concentrated sulfuric acid with a mass fraction of 98% is 1:1;

[0038] Pour 200 mL of ultrapure water into the reacted product, and add 10 mL of hydrogen peroxide with a mass fraction of 30%. After the reaction solution is cooled, the product is centrifugally washed with ultrapure water until neutral, the aqueous solution of the product is ultrasonically dispersed for 2 hours, and then freeze-d...

Embodiment 2

[0051] Step 1: put natural flake graphite, concentrated sulfuric acid with a mass fraction of 98%, and sodium nitrate in a weight ratio of 2:98:2 into ice water, and magnetically stir evenly. Then slowly add 13g of potassium permanganate three times, the temperature is controlled at 0°C, and react for 90min. Heat to 35°C and react for 2h, slowly add 90mL of ultrapure water, the temperature rises to 100°C, keep warm for 2h, then stop heating. Among them, the quality of potassium permanganate is 7 times that of natural graphite, and the volume ratio of ultrapure water to concentrated sulfuric acid with a mass fraction of 98% is 1.5:1;

[0052]Pour 200 mL of ultrapure water into the reacted product, and add 10 mL of hydrogen peroxide with a mass fraction of 30%. After the reaction solution is cooled, the product is centrifugally washed with ultrapure water until neutral, the aqueous solution of the product is ultrasonically dispersed for 2 hours, and then freeze-dried to obtain ...

Embodiment 3

[0058] Step 1: Put natural flake graphite, concentrated sulfuric acid with a mass fraction of 98%, and sodium nitrate in ice water in a weight ratio of 3:100:3.5, and stir evenly with magnetic force. Then slowly add 15 g of potassium permanganate three times, the temperature is controlled at 0° C., and react for 90 minutes. Heat to 35°C and react for 2h, slowly add 100mL ultrapure water, the temperature rises to 100°C, keep warm for 2h, then stop heating. Among them, the quality of potassium permanganate is 4 to 12 times that of natural graphite, and the volume ratio of ultrapure water to concentrated sulfuric acid with a mass fraction of 98% is 1:1;

[0059] Pour 200 mL of ultrapure water into the reacted product, and add 10 mL of hydrogen peroxide with a mass fraction of 30%. After the reaction solution is cooled, the product is centrifugally washed with ultrapure water until neutral, the aqueous solution of the product is ultrasonically dispersed for 2 hours, and then free...

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Abstract

The invention provides a method for preparing a lamellar barium ferrite / RGO (Reduced Graphene Oxide) composite wave absorption material with a tape casting method. The lamellar barium ferrite / RGO composite wave absorption material is prepared through the tape casting method; BaFe12O19 is mixed powder of random powder BaFe12O19 and oriented BaFe12O19 powder according to the ratio of (90 percent to 70 percent) to (10 percent to 30 percent); the ratio of the total mass of the random powder and the oriented BaFe12O19 to the mass of reduced graphene oxide is (5 to 7) to (0.1 to 0.5). Then a mixture is dried and an organic matter is discharged. The method is simple in process and low in cost; the thickness of an obtained lamellar composite material reaches a micron scale and layers are tightly combined; an inner structure is uniform and the material has good electromagnetic wave absorption performance and has a good application prospect in the field of electromagnetic wave absorption materials.

Description

technical field [0001] The invention belongs to the field of material science, provides a method for preparing two layers of barium ferrite / RGO composite wave-absorbing material by casting method, and belongs to the technical field of multi-layer composite wave-absorbing material preparation. Background technique [0002] With the development of science and technology, absorbing materials have played an increasingly important role in the field of modern defense stealth technology and life radiation prevention. To achieve good absorbing performance, two conditions must be met: the incident electromagnetic wave must enter the interior of the absorbing material as much as possible without being reflected; the electromagnetic wave entering the interior of the material must be absorbed as much as possible. Therefore, the absorber with a multi-layer structure, through the role of impedance matching, makes the electromagnetic waves incident from space enter the absorbing material a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/06B32B27/20B32B27/28B32B33/00B32B37/02B32B37/15
CPCB32B27/08B32B27/20B32B27/28B32B33/00B32B37/02B32B37/15B32B2307/102
Inventor 杨海波韩宁林营刘潇高淑雅朱建锋王芬
Owner SHAANXI UNIV OF SCI & TECH
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