Preparation method for lanthanum-doped barium ferrite-poly-o-methylaniline composite wave-absorbing material

A composite wave absorbing material, barium ferrite technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of high density, high relative magnetic permeability, difficult to prepare wave absorbing materials, etc., and achieve wave absorbing performance good effect

Inactive Publication Date: 2012-07-04
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Ferrite absorbing material is a well-studied and relatively mature absorbing material. It has good frequency characteristics, large relative magnetic permeability, and small relative permittivity. It is suitable for making matching layers and has advantages in widening the frequency band at low frequencies. Good application prospects, but its disadvantage is that the density is too high, it is difficult to prepare light-weight absorbing materials, and the single-component ferrite absorption band is narrow

Method used

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  • Preparation method for lanthanum-doped barium ferrite-poly-o-methylaniline composite wave-absorbing material
  • Preparation method for lanthanum-doped barium ferrite-poly-o-methylaniline composite wave-absorbing material
  • Preparation method for lanthanum-doped barium ferrite-poly-o-methylaniline composite wave-absorbing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Accurately weigh 1.96g Ba(NO 3 ) 2 , 0.13g La(NO 3 ) 3 9H 2 O, 36.24g Fe(NO 3 ) 3 9H 2 O was dissolved in deionized water to prepare a mixed solution. Add 20.49g citric acid to the mixed solution. After the dissolution was complete, add an appropriate amount of ammonia water to adjust the pH value to be weakly acidic, then add 2g polyethylene glycol, and age at room temperature for 12 hours. Form a sol, after vacuum drying at 90°C, ignite in the air to form a loose powder bundle, grind and mix, keep at 800°C for 1 hour, heat up to 980°C for 2 hours, and then get lanthanum-doped barium ferrite (x=0.04), preparation process as attached figure 1 shown.

[0020] (2) Add 0.20g of lanthanum-doped barium ferrite (x=0.04) and 1mL of o-toluidine monomer into 100mL of 1.5mol / L hydrochloric acid, ultrasonically disperse them evenly, and place them in an ice-water bath. 4 ) 2 S 2 o 8 The hydrochloric acid solution was added dropwise (about 0.5h) into the above syste...

Embodiment 2

[0022] (1) Accurately weigh 1.96g Ba(NO 3 ) 2 , 0.26g La(NO 3 ) 3 9H 2 O, 36.12g Fe(NO 3 ) 3 9H 2 O, the preparation method is the same as Example 1 (1), that is, lanthanum-doped barium ferrite (x=0.08) is obtained.

[0023] (2) Take 0.20g of lanthanum-doped barium ferrite (x=0.08), and the preparation method is the same as Example 2 (1), that is, the composite wave-absorbing material of lanthanum-doped barium ferrite-poly-o-toluidine (x=0.08 ), the highest absorption peak of the prepared composite absorbing material can reach -38dB within 1-20GHz.

Embodiment 3

[0025] (1) Accurately weigh 1.96g Ba(NO 3 ) 2 , 0.39g La(NO 3 ) 3 9H 2 O, 36.00g Fe(NO 3 ) 3 9H 2 O, the preparation method is the same as Example 1 (1), that is, lanthanum-doped barium ferrite (x=0.12) is obtained.

[0026] (2) Take 0.20g of lanthanum-doped barium ferrite (x=0.12), and the preparation method is the same as Example 2 (1), that is, the composite wave-absorbing material of lanthanum-doped barium ferrite-poly-o-toluidine (x=0.12 ), the highest absorption peak of the prepared composite absorbing material can reach -40dB within 1-20GHz.

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Abstract

The invention provides a preparation method for a lanthanum-doped barium ferrite-poly-o-methylaniline composite wave-absorbing material. According to the method, nitrate and citric acid are used as raw materials, lanthanum-doped barium ferrite (BaLaxFe12-xO19, x is equal to 0.04 to 0.12) is prepared by a sol-gel self-propagating high-temperature synthesis method, and the lanthanum-doped barium ferrite-poly-o-methylaniline composite wave-absorbing material is prepared by an in-situ compounding technology. The material is good in absorption performance, and has wide application prospect in the fields of stealth technologies of military equipment, civil human safety protection, communication interference, electronic information confidentiality and the like.

Description

technical field [0001] The invention belongs to the field of preparation of electromagnetic wave absorbing materials, in particular to a method for preparing a lanthanum-doped barium ferrite-poly-o-toluidine composite wave absorbing material. Background technique [0002] Ferrite absorbing material is a well-studied and relatively mature absorbing material. It has good frequency characteristics, large relative magnetic permeability, and small relative permittivity. It is suitable for making matching layers and has advantages in widening the frequency band at low frequencies. It has good application prospects, but its disadvantage is that the density is too large, it is difficult to prepare light-weight absorbing materials, and the single-component ferrite absorption band is narrow. [0003] The 4f electrons of rare earth elements are subjected to 5s 2 5p 6 The shielding of the shell, its atoms and ions have electromagnetic properties such as paramagnetic susceptibility, sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/02C09K3/00C08K3/22C08G73/02
Inventor 谢宇余远福赵杰刘锦梅凌云王娟洪小伟
Owner NANCHANG HANGKONG UNIVERSITY
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