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Method for preparing carbon/nickel composite wave-absorbing material with macroporous structure by gamma-ray irradiation method

A composite wave-absorbing material and ray irradiation technology, which is applied in the preparation/purification of carbon, magnetic/electric field shielding, electrical components, etc., can solve the problems of small influence and poor electromagnetic wave absorption performance, and achieve low pollution and environmental hazards , Increase the effect of impedance matching characteristics and multiple reflection capabilities

Active Publication Date: 2021-05-11
TECHN PHYSICS INST HEILONGJIANG ACADOF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problem that the existing microporous or mesoporous carbon materials are used to prepare composite wave-absorbing materials, which have little influence on the multiple reflections of induced incident electromagnetic waves and electromagnetic wave absorption. Due to the technical problem of poor performance, a method for preparing a carbon / nickel composite absorbing material with a macroporous structure by γ-ray irradiation is provided

Method used

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  • Method for preparing carbon/nickel composite wave-absorbing material with macroporous structure by gamma-ray irradiation method
  • Method for preparing carbon/nickel composite wave-absorbing material with macroporous structure by gamma-ray irradiation method
  • Method for preparing carbon/nickel composite wave-absorbing material with macroporous structure by gamma-ray irradiation method

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Embodiment 1

[0035] Embodiment 1: A method of preparing a carbon / nickel composite wave-absorbing material with a macroporous structure in this embodiment is carried out according to the following steps:

[0036] 1. Peel off the outer skin of the mature corn stalks, cut the corn stalks into pieces, wash with deionized water, filter, dry in a blast drying oven at 80°C for 3 hours, and then place them in 0.5mol / L acetic acid Immerse in nickel solution for 2 hours, filter, and dry in a blast drying oven at 80°C for 3 hours to obtain straw pulp;

[0037] 2. Place the dried straw pulp in step 1 in a ceramic boat and perform high-temperature carbonization and pyrolysis under a nitrogen atmosphere. The specific process of the high-temperature carbonization and pyrolysis is: the temperature is raised from room temperature to 750°C at a heating rate of 5°C / min, And heat preservation at this temperature for 2 hours to obtain carbonized material;

[0038] 3. The carbonized material obtained in step 2...

Embodiment 2

[0041] Embodiment 2: the difference between this embodiment and embodiment 1 is: the concentration of nickel acetate described in step 1 is 0.05mol / L. Other steps and parameters are the same as in Example 1.

Embodiment 3

[0042] Embodiment 3: the difference between this embodiment and embodiment 1 is: the concentration of nickel acetate described in step 1 is 0.25mol / L. Other steps and parameters are the same as in Example 1.

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Abstract

The invention relates to a method for preparing a carbon / nickel composite wave-absorbing material with a macroporous structure by using a gamma-ray irradiation method. The invention belongs to the field of wave-absorbing material preparation. The invention aims to solve the technical problems that the influence on multiple reflection effects of inducing incident electromagnetic waves is relatively small and the electromagnetic wave absorption performance is relatively poor when a composite wave-absorbing material is prepared by utilizing a microporous or mesoporous carbon material in the prior art. The method provided by the invention comprises the following steps: 1, cutting corn straw flesh into blocks, and dipping the blocks in a nickel salt solution; 2, performing high-temperature carbonization pyrolysis in an inert gas atmosphere; 3, dipping with hydrochloric acid, washing to be neutral, filtering and drying; 4, adding a nickel salt solution and isopropanol for ultrasonic dispersion; and 5, introducing nitrogen, and irradiating under <60> Co-gamma rays to obtain the carbon / nickel composite wave-absorbing material. The carbon / nickel composite wave-absorbing material prepared by taking the corn straw as a precursor through pyrolysis, acid pickling and < 60 > Co-gamma ray irradiation has the characteristics of a macroporous structure, the impedance matching characteristic and the multi-reflection capability of the material are improved, and the material shows excellent wave-absorbing performance.

Description

technical field [0001] The invention belongs to the field of wave-absorbing material preparation; in particular, it relates to a method for preparing a carbon / nickel composite wave-absorbing material with a macroporous structure by using a gamma-ray irradiation method. Background technique [0002] High-performance electromagnetic wave absorbing materials are of great significance to national defense construction and social life. They can convert incident electromagnetic waves into heat and other forms of energy, thereby fundamentally dissipating incident electromagnetic waves and improving the electromagnetic environment. Magnetic materials, especially magnetic metals, have been used as typical electromagnetic wave absorbing materials in the past, but they have some inherent disadvantages, such as high density, easy corrosion, and low Curie temperature, which limit their further development. Carbon materials, such as carbon nanotubes (CNTs), carbon nanofibers (CNFs), reduce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00C01B32/05
CPCH05K9/0081C01B32/05Y02E60/13
Inventor 赵弘韬张楠李金凤李志刚田波杨仲秋卫光张建伟汪鑫伟
Owner TECHN PHYSICS INST HEILONGJIANG ACADOF SCI
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