BaFe12O19 composite powder and preparation method thereof

A technology of bafe12o19 and xbafe12o19, which is applied in the field of BaFe12O19-based composite powder and its preparation, can solve problems such as poor impedance matching characteristics, ferrite cannot meet magnetic properties, and poor wave-absorbing performance, and achieve improved impedance matching characteristics and excellent wave-absorbing properties Performance, the effect of optimizing the absorbing performance

Inactive Publication Date: 2016-04-13
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A single ferrite cannot meet its excellent magnetic properties. The excellent electrical conductivity of polyaniline makes its impedance matching characteristics poor, and its absorbing performance is poor when used alone. By combining different types of absorbing materials, the impedance matching characteristics can be improved. It is an effective method to improve its absorbing performance

Method used

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  • BaFe12O19 composite powder and preparation method thereof
  • BaFe12O19 composite powder and preparation method thereof
  • BaFe12O19 composite powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) by BaFe 12 o 19 , CaFe 2 o 4 The molar ratio is 1:2, the analytically pure Ba(NO 3 ), Ca(NO 3 ) 2 4H 2 O, Fe(NO 3 ) 3 9H 2 O and C 6 h 8 o 7 ·H 2 O (citric acid) was dissolved in deionized water, then ammonia water was added dropwise to adjust the pH value to 6.8, stirred evenly at 85°C and then dried to obtain xerogel; then the obtained xerogel was ground and calcined at 950°C And keep warm for 3.5 hours to get BaFe 12 o 19 / CaFe 2 o 4 Composite powder.

[0034] 2) BaFe 12 o 19 / CaFe 2 o 4 The composite powder and commercial nano-cobalt ferrite powder are mixed uniformly according to the mass ratio x: (1-x), and then heat treated at 500 ° C for 4 hours to obtain xBaFe 12 o 19 / CaFe 2 o 4 / (1-x)CoFe 2 o 4 Composite powder; wherein, x is 0.9;

[0035] 3) Add 1gxBaFe 12 o 19 / CaFe 2 o 4 / (1-x)CoFe 2 o 4 The composite powder was dissolved in 100mL of 1mol / L hydrochloric acid solution, and after stirring for 30 minutes, aniline was added...

Embodiment 2

[0040] 1) by BaFe 12 o 19 , CaFe 2 o 4 The molar ratio is 1:2, the analytically pure Ba(NO 3 ), Ca(NO 3 ) 2 4H 2 O, Fe(NO 3 ) 3 9H 2 O and C 6 h 8 o 7 ·H 2 O (citric acid) was dissolved in deionized water, then ammonia water was added dropwise to adjust the pH value to 7, stirred evenly at 80°C and then dried to obtain xerogel; then the obtained xerogel was ground and calcined at 1000°C And keep warm for 3 hours to get BaFe 12 o 19 / CaFe 2 o 4 Composite powder.

[0041] 2) BaFe 12 o 19 / CaFe 2 o 4 The composite powder and commercial nano-cobalt ferrite powder are mixed uniformly according to the mass ratio x: (1-x), and then heat-treated at 480°C for 5 hours to obtain xBaFe 12 o 19 / CaFe 2 o 4 / (1-x)CoFe 2 o 4 Composite powder; wherein, x is 0.8;

[0042] 3) Add 1gxBaFe 12 o 19 / CaFe 2 o 4 / (1-x)CoFe 2 o 4 The composite powder was dissolved in 100mL of 1mol / L hydrochloric acid solution, and after stirring for 40 minutes, aniline was added; the...

Embodiment 3

[0047] 1) by BaFe 12 o 19 , CaFe 2 o 4 The molar ratio is 1:2, the analytically pure Ba(NO 3 ), Ca(NO 3 ) 2 4H 2 O, Fe(NO 3 ) 3 9H 2 O and C 6 h 8 o 7 ·H 2 O (citric acid) was dissolved in deionized water, then ammonia water was added dropwise to adjust the pH value to 7.2, stirred evenly at 75°C and then dried to obtain xerogel; then the obtained xerogel was ground and calcined at 900°C And keep warm for 4 hours to get BaFe 12 o 19 / CaFe 2 o 4 Composite powder.

[0048] 2) BaFe 12 o 19 / CaFe 2 o 4 The composite powder and commercial nano-cobalt ferrite powder are mixed evenly according to the mass ratio x: (1-x), and then heat treated at 520°C for 4 hours to obtain xBaFe 12 o 19 / CaFe 2 o 4 / (1-x)CoFe 2 o 4 Composite powder; wherein, x is 0.7;

[0049] 3) Add 1gxBaFe 12 o 19 / CaFe 2 o 4 / (1-x)CoFe 2 o 4 The composite powder was dissolved in 100mL of 1mol / L hydrochloric acid solution, and after stirring for 50 minutes, aniline was added; then ...

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Abstract

The invention relates to a BaFe12O19 composite powder and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing BaFe12O19/CaFe2O4 composite powder and nano cobalt ferrite powder, carrying out heat treatment at 480-550 DEG C for 3-5 hours to obtain powder, wherein x is 0.6-0.9; dissolving the powder in a hydrochloric acid solution, stirring uniformly, and adding aniline; and adding an ammonium persulfate hydrochloric acid solution under ice water bath conditions, and reacting for 10-15 hours. As the CoFe2O4 content increases, the interface of the composite powder increases; and meanwhile, the synergistic effect among different materials can enhance the doublet and interfacial polarization, so that the dielectric loss is enhanced, and the impedance matching characteristic is enhanced, thereby achieving the goal of optimizing the wave-absorbing property. The composite powder has excellent wave-absorbing property; the reflection loss can reach -23 to -38dB; and the preparation technique of the composite powder is simple.

Description

technical field [0001] The invention belongs to the field of material science and relates to a BaFe 12 o 19 Matrix composite powder and preparation method thereof. Background technique [0002] In recent years, with the development of science and technology, a large number of electronic devices have entered daily life, and electromagnetic radiation pollution has become increasingly serious. The deteriorating electromagnetic environment will not only interfere with the normal operation of electronic instruments and equipment, but also affect human health. In the military, the international competition of weapons and equipment is becoming increasingly fierce. Due to the rapid development of modern detection technology and precision-guided weapons, it has caused a great threat to the survival of weapons. Therefore, it is imperative to study the stealth of weapons. The microwave absorbing material is one of the key materials in the fields of national defense, military industr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/02C08K3/24
CPCC08G73/0266C08K3/24C08K2201/011C08K2201/014
Inventor 杨海波叶婷林营朱建锋王芬
Owner SHAANXI UNIV OF SCI & TECH
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