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Method for preparing porous carbon born nano ferrite wave-absorbing material

A nano-ferrite and wave-absorbing material technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of easy agglomeration of nano-ferrite, achieve easy parameter control, easy industrialization, and prevent crystal growth Effect

Inactive Publication Date: 2011-07-27
SHENYANG LIGONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can well overcome the problem of easy agglomeration of nano-ferrite prepared by sol-gel method during calcination

Method used

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  • Method for preparing porous carbon born nano ferrite wave-absorbing material
  • Method for preparing porous carbon born nano ferrite wave-absorbing material
  • Method for preparing porous carbon born nano ferrite wave-absorbing material

Examples

Experimental program
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Effect test

Embodiment 1

[0022] The preparation method of a novel porous carbon material loaded nano-ferrite absorbing material is according to (molar ratio Zn(NO 3 ) 2 ·6H 2 O:Fe(NO 3 ) 3 9H 2 O:MnCl 2 4H 2 O=0.2: 2: 0.8) take medicine, be mixed with solution and stir with magnetic stirrer; With the ratio of the amount of metal ion and citric acid substance 1: 1, weigh citric acid, be dissolved in deionized water, use drop Slowly add the solution dropwise into the above solution, and stir while adding dropwise. After stirring evenly, adjust the pH value of the solution to pH=4 with ammonia water; stir the above solution at a constant temperature of 80°C for 2 hours; : 0.5 Weigh the activated carbon fiber and add it, continue to heat and stir until a viscous activated carbon fiber / gel mixture is formed; put it into an oven at 130°C for drying.

[0023] Put the active carbon fiber / gel dry glue mixture into the porcelain boat, then put the porcelain boat into the center of the quartz tube in the ...

Embodiment 2

[0025] The preparation method of a novel porous carbon material loaded nano-ferrite absorbing material is according to (molar ratio Zn(NO 3 ) 2 ·6H 2 O:Fe(NO 3 ) 3 9H 2 O:MnCl 2 4H 2 O=0.2: 2: 0.8) take medicine, be mixed with solution and stir with magnetic stirrer; With the ratio of the amount of metal ion and citric acid substance 1: 1, weigh citric acid, be dissolved in deionized water, use drop Slowly add the solution dropwise into the above solution, and stir while adding dropwise. After stirring evenly, adjust the pH value of the solution to pH=4 with ammonia water; stir the above solution at a constant temperature of 80°C for 2 hours; : 2 Weigh the activated carbon fiber and add it, continue to heat and stir until a viscous activated carbon fiber / gel mixture is formed; put it into an oven at 130° C. for drying.

[0026] Put the active carbon fiber / gel dry glue mixture into the porcelain boat, then put the porcelain boat into the center of the quartz tube in the ...

Embodiment 3

[0028] The preparation method of a novel porous carbon material-loaded nano-ferrite absorbing material is according to a certain stoichiometric ratio (molar ratio Zn(NO 3 ) 2 ·6H 2 O:Fe(NO 3 ) 3 9H 2 O:MnCl 2 4H 2 O=0.2: 2: 0.8) take medicine, be mixed with solution and stir with magnetic stirrer; With the ratio of the amount of metal ion and citric acid substance 1: 1, weigh citric acid, be dissolved in deionized water, use drop Slowly add the solution dropwise into the above solution, and stir while adding dropwise. After stirring evenly, adjust the pH value of the solution to pH=4 with ammonia water; stir the above solution at a constant temperature of 80°C for 2 hours; : 0.5 Weigh activated carbon and add it, continue to heat and stir until a thick activated carbon / gel mixture is formed; put it into an oven at 130° C. to dry to obtain an activated carbon / gel xerogel mixture.

[0029] Put the activated carbon / gel dry glue mixture into the porcelain boat, then put the...

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Abstract

The invention relates to a method for preparing a porous carbon born nano ferrite wave-absorbing material, comprising the following two main processes: firstly, preparing the mixture of porous carbon materials and dry gel; and secondly, calcining the obtained mixture of porous carbon materials and dry gel under the nitrogen atmosphere, wherein calcination comprises the following steps: placing the dried mixture of porous carbon materials and dry gel into a porcelain boat; arranging the porcelain boat at the center of a quartz tube in a horizontal reacting furnace, raising the temperature of the reacting furnace to 600-650 DEG C under the nitrogen atmosphere, and holding the temperature for one hour; reducing the temperature of a reaction tube to the room temperature through cooling under the protection of nitrogen after reaction; and obtaining the products in the porcelain boat, namely the novel porous carbon born ferrite wave-absorbing material. According to the method, the enlargement of crystallization of ferrite particles and the soft agglomeration of nano ferrite can be avoided by utilizing the special characteristics and functions of the pore structure of the porous carbon material; and the porous carbon born ferrite is firmer and hard to fall.

Description

technical field [0001] The invention belongs to the intersecting technical field of porous carbon materials and nano-magnetic materials, and relates to a method for preparing porous carbon-loaded ferrite novel wave-absorbing materials by using a sol-gel process with porous carbon materials as a matrix. Background technique [0002] For the method of preparing porous carbon material loaded ferrite with porous carbon material as the substrate by sol-gel process, there is no corresponding report at home and abroad. The research background related to the present invention will be introduced below. [0003] Absorbing materials have a wide range of civilian uses in electromagnetic shielding such as television broadcasting, microwave anechoic chambers, electronic equipment, and precision instruments. At the same time, they are also urgently needed in military aspects such as military electronic countermeasures and stealth weapons, which further promotes the research and development ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00C04B35/83C04B35/622C04B35/26C04B35/52
Inventor 安玉良袁露李玉海张罡郑朝辉
Owner SHENYANG LIGONG UNIV
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