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Dielectric/magnetic composite wave-absorbing powder preparation method

A magnetic powder and magnetic technology, which is applied in the field of preparation of dielectric/magnetic composite wave-absorbing powder, can solve the problems of easy introduction of impurities, poor interface and structure, and difficult mixing of components, so as to improve the comprehensive performance , Organizational structure symmetry, the effect of broadening the microwave absorption frequency band

Active Publication Date: 2006-07-26
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the disadvantages that the components are not easy to mix uniformly, the phases appear in agglomerated form, the interface and structure are poor, impurities are easily introduced during the ball milling process, and the advantages of compounding cannot be fully utilized.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Step 1: Add quantitative ferric nitrate (Fe(NO 3 ) 3 .9H 2 O), strontium nitrate (Sr(NO 3 ) 2 ), white granulated sugar, the raw material molar ratio is sucrose: (Fe 3+ +Sr 2+ )=2.0, add deionized water and stir at room temperature to mix evenly. Heat treatment to obtain the precursor. Put the precursor in a corundum burning boat, pretreat it in a muffle furnace at 450°C for two hours, then raise the temperature at a rate of 10°C per minute to 900°C, keep it for 1 hour, and cool down with the furnace to obtain magnetoplumbite-type magnetic powder body.

[0016] Step 2: Weigh 2.0 g of freshly prepared magnetic powder, add it into a 0.1 vol% polyethyleneimine aqueous solution, stir for 3 hours, and then pour out the solution to obtain a surface-treated magnetic powder.

[0017] Step 3: Weigh 10 grams of 1 mole hydrochloric acid solution, add deionized water to 500 milliliters, then add the magnetic powder in step 2, ultrasonically disperse for 15 minutes, then add...

Embodiment 2

[0020] Step 1: Add quantitative ferric nitrate (Fe(NO 3 ) 3 .9H 2 O), barium nitrate (Ba(NO 3 ) 2 ), white granulated sugar, the raw material molar ratio is sucrose: (Fe 3+ +Ba 2+ )=2, add deionized water and stir at room temperature to mix evenly. Heat treatment to obtain the precursor. Put the precursor in the corundum burning boat, pretreat in the muffle furnace at 450°C for two hours, then raise the temperature to 900°C at a rate of 10°C per minute, keep it for 1 hour, and cool with the furnace to obtain garnet-type magnetic powder .

[0021] Step 2: Weigh 8.0 g of freshly prepared magnetic powder, add it into 3.0 vol% polyesterimide aqueous solution, stir for 3 hours, and then pour out the solution to obtain surface-treated magnetic powder.

[0022] Step 3: Weigh 25 grams of 1 mole hydrochloric acid solution, add deionized water to 1000 ml, then add the magnetic powder in step 2, ultrasonically disperse for 10 minutes, add 1.4 grams of aniline monomer, and move th...

Embodiment 3

[0025] Step 1: Add quantitative ferric nitrate (Fe(NO 3 ) 3 .9H 2 O), nickel nitrate (Ni(NO 3 ) 2 .6H 2 O), white granulated sugar, raw material molar ratio is sucrose: (Fe 3+ +Ni 2+ )=2, add deionized water and stir at room temperature to mix evenly. Heat treatment to obtain the precursor. Put the precursor in a corundum burning boat, pre-treat it in a muffle furnace at 450°C for two hours, then increase the temperature at a rate of 10°C per minute to 700°C, keep it for 1 hour, and cool down with the furnace to obtain spinel-type magnetic powder body.

[0026] Step 2: Weigh 5.0 g of freshly prepared magnetic powder, add it to 1.5 vol% aqueous solution of polypropyleneimine and polyethyleneimine, stir for 3 hours, and then pour out the solution to obtain surface-treated magnetic powder.

[0027] Step 3: Weigh 12 grams of 1 mole hydrochloric acid solution, add deionized water to 800 ml, then add the magnetic powder in step 2, ultrasonically disperse for 5 minutes, add ...

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Abstract

This invention relates to preparing method for a kind of dielectric / magnet composite wave-absorbing powder in the field of composite material technology. It is prepared through these steps: (1) Prepartion for magnetic powder: mix nitrate aqueous solution that contains ferrite with sucrose solution, heat to get usher of the ferrite, treat the usher to get magnetic powder; (2) Surface treatment of the magnetic powder: add the upper magnetic powder into organic solution, pouring the liquid out after agitating, and the magnetic powder with amino function group is got; (3) originally deposit dielectric / magnet composite material; (4)After finishing above reation, remove the vessel from ice bath or water bath, suct, firstly wash some times by much deion water, then wash by ethanol or acetone until colature has no colour or no deposition when testing by diluted silver nitrite, lastly dry the wet powder and dielectric / magnet composite powder is generated. The electromechanical parameter of the composite powder is adjustable. The composite powder has homogeneous construction, which reinforces its wave-absorbing mechanism.

Description

technical field [0001] The invention relates to a preparation method in the technical field of composite materials, in particular to a preparation method of a dielectric / magnetic composite wave-absorbing powder. technical background [0002] Electromagnetic waves of different frequencies are entering the field of human life and production. Electromagnetic radiation has caused huge environmental pollution. This pollution includes two aspects: one is the impact on human health and safety; the other is the impact on various electronic instruments, Electromagnetic interference from equipment. In the field of electromagnetic wave protection, electromagnetic shielding is usually used for protection. Since electromagnetic shielding will bring the disadvantages of high reflection of electromagnetic waves, the current requirements for shielding materials have also been adjusted from high reflection in the past to high absorption and low reflection. When electromagnetic waves pass t...

Claims

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Application Information

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IPC IPC(8): C09K3/00H05K9/00C08K3/22
Inventor 胡克鳌唐欣田卿赵斌元
Owner SHANGHAI JIAO TONG UNIV
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