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Modification method for electromagnetic parameters of carbonyl iron powder

A carbonyl iron powder, electromagnetic parameter technology, applied in the field of absorbent preparation, can solve the problem of dielectric constant and magnetic parameter mismatch, reduce the dielectric constant and other problems, to reduce the dielectric constant, improve the magnetic parameter, change the shape of the problem. Effect

Inactive Publication Date: 2016-04-20
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the technical problem of the mismatch between the dielectric constant and the magnetic parameter of the carbonyl iron powder type absorbent prepared by the existing production method in the case of a high dosage, and provides a method for changing the carbonyl iron powder particles by using a physical mechanical ball milling method. shape, increase the specific surface area, and improve the magnetic parameters; and then use the metal phosphating process to form a metal passivation film on the surface of the carbonyl iron powder, which can effectively reduce its dielectric constant without changing the magnetic parameters, so as to achieve the matching of electromagnetic parameters Modification Method of Electromagnetic Parameters of Carbonyl Iron Powder

Method used

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  • Modification method for electromagnetic parameters of carbonyl iron powder

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Experimental program
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Effect test

Embodiment 1

[0033] Put the carbonyl iron powder produced by Jiangxi Yuean Superfine Metal Material Co., Ltd. without other process treatment into four agate jars of the XQM-2L frequency conversion planetary ball mill of Nanjing Keyan Experimental Instrument Research Institute, and place iron powder in each jar 250g, 10 agate balls with a diameter of 20mm and 25 agate balls with a diameter of 8mm;

[0034] Fix the agate jar on the planetary ball mill, control the rotation speed to 200r / min, change the rotation direction of the ball mill every 0.5 hours, stop the ball mill after 20 hours, and take out the carbonyl iron powder;

[0035] Mix the carbonyl iron powder taken out according to the following formula: (1) Add 0.75ml of analytically pure phosphoric acid dropwise into 200ml of analytically pure acetone and stir well until the mixture is uniform, add 500g of carbonyl iron powder after ball milling and continue stirring until there are no more bubbles Produced, continue to stir at 25-35...

Embodiment 2

[0038] The carbonyl iron powder produced by Jiangxi Lanhai Absorbing Material Co., Ltd. was placed in four vacuum agate jars of the XQM-2L frequency conversion planetary ball mill of Nanjing Keyan Experimental Instrument Research Institute, and 250g of carbonyl iron powder was placed in each jar, with a diameter of 10 20mm agate balls, 25 8mm agate balls;

[0039] The agate jar is fixed on the planetary ball mill, the control speed is 300r / min, and the rotation direction of the ball mill is changed every 0.5 hours. Stop after 10 hours, and the carbonyl iron powder in the jar is taken out;

[0040]Mix the carbonyl iron powder taken out according to the following formula: drop 0.75ml of analytically pure phosphoric acid into 200ml of analytically pure acetone and stir until it is evenly mixed, add 500g of carbonyl iron powder after ball milling and continue stirring until no more bubbles are produced Stirring was continued at -35°C until the solvent evaporated completely. The p...

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Abstract

The invention relates to a modification method for electromagnetic parameters of carbonyl iron powder and belongs to the field of absorbent preparation. The technical problem that the dielectric constant and the magnetic parameter of a carbonyl iron powder absorbent prepared through an existing preparation method are mismatched at a high mixing amount is solved. The preparation method includes the steps that firstly, the untreated carbonyl iron powder is treated according to a ball milling method through metal pots and ball milling balls so that the purposes of increasing the specific surface area, changing the micro-shape and then adjusting the electromagnetic parameters can be achieved; then, a passive film is generated on the surface of the carbonyl iron powder through a metal passivation chemical technology so that the dielectric constant of the carbonyl iron powder can be effectively reduced; finally, relatively-uniform phosphatized micron-size carbonyl iron powder particles are obtained by grinding the dried carbonyl iron powder in a non-destructive mode. By testing the electromagnetic parameters of the carbonyl iron powder, it is found that the real part of the dielectric constant of the treated carbonyl iron powder is significantly reduced, and the magnetic loss is kept unchanged basically, so that the purposes of parameter matching and parameter modification are achieved.

Description

technical field [0001] The invention belongs to the field of absorbent preparation, and in particular relates to a method for modifying the electromagnetic parameters of carbonyl iron powder by adopting ball milling and phosphating process optimization in combination with physical and chemical methods to realize the modification of the electromagnetic parameters of carbonyl iron powder. Background technique [0002] Most of the carbonyl iron powder absorbents prepared by traditional methods will have a mismatch of magnetic permeability and magnetic loss due to the high real part and imaginary part of the dielectric constant under the condition of high concentration, which cannot meet the requirements of microwave absorption. The material needs to achieve high attenuation in each band. For this reason, it is trying to find a treatment method that can properly adjust the real and imaginary parts of the permittivity without changing the magnetic permeability and magnetic loss, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/16
CPCC01G49/16C01P2004/80C01P2006/42
Inventor 孙洪国刘佳郇彦王杰陈兆彬杨小牛
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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