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Proportion-adjustable CoNi/porous carbon microwave absorbent and preparation method thereof

A technology of microwave absorbent and porous carbon, which is applied in the preparation of CoNi/porous carbon microwave absorbent, and the field of CoNi/porous carbon microwave absorbent, can solve problems such as unfavorable industrial production, complex multi-step processing process, etc., and achieve excellent electromagnetic absorption. The effect of wave performance, simple process and low cost

Inactive Publication Date: 2017-09-08
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods all have complex multi-step processes, which are not conducive to large-scale industrial production.

Method used

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  • Proportion-adjustable CoNi/porous carbon microwave absorbent and preparation method thereof
  • Proportion-adjustable CoNi/porous carbon microwave absorbent and preparation method thereof
  • Proportion-adjustable CoNi/porous carbon microwave absorbent and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation method of the CoNi / porous carbon microwave absorber with adjustable ratio of the present invention comprises the following steps:

[0030] Step 1, weigh 6mmol of cobalt nitrate and 6mmol of nickel nitrate and dissolve them in 100mL of deionized water respectively, then configure 20mL of sodium alginate sol with a mass fraction of 2.0wt%, and slowly pour the dissolved cobalt nitrate and nickel nitrate solutions into the seaweed Sodium acid sol, stirring continuously at room temperature for 24 hours, after the stirring, the initial product after the reaction was washed with water and absolute ethanol three times respectively, and dried in a vacuum drying oven at 60°C for 24 hours after cleaning;

[0031] Step 2, calcining the initial product obtained in step 1 at high temperature in a nitrogen atmosphere, the heating rate is 1°C / min, the calcination temperature is 600°C, and the holding time is 6h. The obtained product is marked as Co 1 Ni 1 / C.

Embodiment 2

[0033] The preparation method of the CoNi / porous carbon microwave absorber with adjustable ratio of the present invention comprises the following steps:

[0034] Step 1, weigh 4mmol of cobalt nitrate and 8mmol of nickel nitrate and dissolve them in 100mL of deionized water respectively, then configure 20mL of sodium alginate sol with a mass fraction of 2.0wt%, and slowly pour the dissolved cobalt nitrate and nickel nitrate solutions into the seaweed Sodium acid sol, stirring continuously at room temperature for 24 hours, after the stirring, the initial product after the reaction was washed with water and absolute ethanol three times respectively, and dried in a vacuum drying oven at 60°C for 24 hours after cleaning;

[0035] Step 2, calcining the initial product obtained in step 1 at high temperature in a nitrogen atmosphere, the heating rate is 1°C / min, the calcination temperature is 600°C, and the holding time is 6h. The obtained product is marked as Co 1 Ni 2 / C.

Embodiment 3

[0037] The preparation method of the CoNi / porous carbon microwave absorber with adjustable ratio of the present invention comprises the following steps:

[0038] Step 1, weigh 3mmol of cobalt nitrate and 9mmol of nickel nitrate and dissolve them in 100mL of deionized water respectively, then configure 20mL of sodium alginate sol with a mass fraction of 2.0wt%, and slowly pour the dissolved cobalt nitrate and nickel nitrate solutions into the seaweed Sodium acid sol, stirring continuously at room temperature for 24 hours, after the stirring, the initial product after the reaction was washed with water and absolute ethanol three times respectively, and dried in a vacuum drying oven at 60°C for 24 hours after cleaning;

[0039] Step 2, calcining the initial product obtained in step 1 at high temperature in a nitrogen atmosphere, the heating rate is 1°C / min, the calcination temperature is 600°C, and the holding time is 6h. The obtained product is marked as Co 1 Ni 3 / C.

[0040]...

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Abstract

The invention discloses a CoNi / porous carbon microwave absorbent with adjustable ratio, and also discloses a preparation method of the CoNi / porous carbon microwave absorbent with adjustable ratio, which includes the following steps: dissolving cobalt salt and nickel salt in seaweed NaCl aqueous solution, stirred for 24 hours, centrifugally washed and dried to obtain the precursor; the precursor was calcined in nitrogen, the cobalt-nickel ions were reduced to metal, and alloy grains of different proportions were formed according to the feeding ratio, and the carbon bonds of the disconnected It is rearranged around the alloy grains, and under certain temperature conditions, a porous carbon composite structure in which CoNi nano-alloy particles are uniformly embedded is formed. The preparation method of the invention has the advantages of simple preparation process, low cost, large output and simple synthesis equipment, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a CoNi / porous carbon microwave absorber with an adjustable ratio, and also relates to a preparation method of the CoNi / porous carbon microwave absorber with an adjustable ratio, belonging to the technical field of microwave absorbing materials. Background technique [0002] The rapid development of electronic communication and the extensive use of electronic equipment bring great convenience to people's production and life. At the same time, the generation of electromagnetic waves will in turn interfere with electronic equipment, and even have a serious impact on human health. . In the military field, the development of radar monitoring and radar detection requires more effective electromagnetic wave absorption. Therefore, it is of great significance to study and prepare efficient electromagnetic wave absorbing materials. According to the impedance matching condition, An ideal electromagnetic absorber should have high magne...

Claims

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Application Information

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IPC IPC(8): C09K3/00C01B32/00C22C19/03C22C19/07
CPCC09K3/00C22C19/03C22C19/07
Inventor 姬广斌权斌张亚男
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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