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A kind of preparation method of wave-absorbing ferrite

A technology of ferrite and nano-ferrite, applied in chemical instruments and methods, other chemical processes, etc., can solve the problem of low absorbing performance, achieve good absorbing performance, promote adhesion, good absorbing performance and dispersion performance effect

Active Publication Date: 2020-09-25
ZHONGDE ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nano-ferrite materials have certain wave-absorbing properties, but their wave-absorbing properties are not high, so it is necessary to improve their wave-absorbing properties to expand their application range

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A preparation method of wave-absorbing ferrite, comprising the steps of:

[0021] S1, Mn(NO 3 ) 2 4H 2 O, Zn(NO 3 ) 2 ·6H 2 O, Fe(NO 3 ) 3 9H 2 Add O to water to dissolve, then add cetyltrimethylammonium bromide and mix well, add aqueous sodium hydroxide solution dropwise to pH = 11, keep stirring during the dropping process, raise the temperature to 72°C, keep it warm for 2.8h, filter to take the filter cake , heated up to 1160°C, calcined for 2.8 hours, and ball milled for 4 hours to obtain nano-ferrite;

[0022] S2. Add the nano-ferrite obtained in S1 to ethanol to disperse evenly to obtain ferrite sol; mix zinc acetate and ethanol, and obtain solution A by ultrasonication; add ferrite sol to solution A and mix evenly, ultrasonicate, and heat , add sodium hydroxide aqueous solution dropwise, keep warm and stir, filter to take the filter cake, wash, then adjust the temperature, and vacuum-dry to obtain wave-absorbing ferrite.

Embodiment 2

[0024] A preparation method of wave-absorbing ferrite, comprising the steps of:

[0025] S1, Mn(NO 3 ) 2 4H 2 O, Zn(NO 3 ) 2 ·6H 2 O, Fe(NO 3 ) 3 9H 2 Add O into water to dissolve, then add cetyltrimethylammonium bromide and mix well, add dropwise sodium hydroxide aqueous solution with a concentration of 1.5mol / l to pH=11.5, keep stirring during the dropwise addition, raise the temperature to 70°C, and keep warm 3h, filter to take the filter cake, heat up to 1150°C, calcined for 3h, and ball milled for 3h to obtain nano-ferrite, in which Mn(NO 3 ) 2 4H 2 O, Zn(NO 3 ) 2 ·6H 2 O, Fe(NO 3 ) 3 9H 2 The molar ratio of O is 0.5:0.5:2, Mn(NO 3 ) 2 4H 2 The weight volume (g / ml) ratio of O to water is 1:30, cetyltrimethylammonium bromide and Fe(NO 3 ) 3 9H 2 The molar ratio of O is 0.9:2;

[0026] S2. Add the nano-ferrite obtained in S1 into ethanol and disperse evenly to obtain a ferrite sol, wherein the weight-to-volume (g / ml) ratio of nano-ferrite and ethanol ...

Embodiment 3

[0028] A preparation method of wave-absorbing ferrite, comprising the steps of:

[0029] S1, Mn(NO 3 ) 2 4H 2 O, Zn(NO 3 ) 2 ·6H 2 O, Fe(NO 3 ) 3 9H 2 Add O into water to dissolve, then add cetyltrimethylammonium bromide and mix well, add dropwise sodium hydroxide aqueous solution with a concentration of 2mol / l to pH=10.5, keep stirring during the dropwise addition, heat up to 75°C, and keep warm for 2.5°C h, filter to take the filter cake, heat up to 1170°C, calcined for 2.5h, and ball milled for 5h to obtain nano-ferrite, wherein, Mn(NO 3 ) 2 4H 2 O, Zn(NO 3 ) 2 ·6H 2 O, Fe(NO 3 ) 3 9H 2 The molar ratio of O is 0.4:0.6:2, Mn(NO 3 ) 2 4H 2 The weight volume (g / ml) ratio of O to water is 1:20, cetyltrimethylammonium bromide and Fe(NO 3 ) 3 9H 2 The molar ratio of O is 1.1:2;

[0030]S2. Add the nano-ferrite obtained in S1 into ethanol and disperse evenly to obtain a ferrite sol, wherein the weight-to-volume (g / ml) ratio of nano-ferrite and ethanol is 1:1...

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PUM

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Abstract

The invention discloses a preparation method for microwave-absorbing ferrite. The preparation method comprises the following steps: S1, adding Mn(NO3)2.4H2O, Zn(NO3)2.6H2O, Fe(NO3)3.9H2O to water and dissolving, adding cetyl trimethyl ammonium bromide and uniformly mixing, dropwise adding sodium hydroxide water solution until pH is equal to 10.5-11.5, continuously stirring in the dropwise adding process, raising the temperature to 70-75 DEG C, and keeping the temperature for 2.5-3 h, filtering and taking a filter cake, calcining, and ball-milling to obtain nano-ferrite; and S2, adding the nano-ferrite obtained in the step S1 to ethyl alcohol, and uniformly dispersing to obtain ferrite sol; uniformly mixing zinc acetate and the ethyl alcohol, to obtain solution A by the ultrasound treatment; adding ferrite sol to the solution A, uniformly mixing, performing the ultrasound treatment, raising the temperature, dropwise adding the sodium hydroxide water solution, keeping the temperature and stirring, filtering and taking the filter cake, washing, regulating the temperature, to obtain the microwave-absorbing ferrite by the vacuum drying.

Description

technical field [0001] The invention relates to the technical field of ferrite materials, in particular to a preparation method of wave-absorbing ferrite. Background technique [0002] The research on absorbing materials was originally aimed at improving the survival rate and combat effectiveness of weapons on the battlefield. However, with the electronic informationization of modern society, the pollution of electromagnetic waves to space is becoming more and more serious, and electromagnetic radiation is becoming more and more obvious, causing greater damage to human beings. Therefore, the application of wave-absorbing materials has gone far beyond the military field. At present, wave-absorbing materials have been widely used in many civilian fields such as broadcasting, communication, and navigation. Nano-ferrite materials have certain wave-absorbing properties, but their wave-absorbing properties are not high, so it is necessary to improve their wave-absorbing properties...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/622C04B35/632C04B35/626C04B35/64C04B41/85C09K3/00
CPCC04B35/2658C04B35/622C04B35/6261C04B35/632C04B35/64C04B41/009C04B41/50C04B41/85C04B2235/3262C04B2235/3284C09K3/00C04B41/4554
Inventor 瞿德林王久如王晓祥李丛俊
Owner ZHONGDE ELECTRONICS
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