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Flake like ceramic wave absorbing material and preparation method thereof

A wave-absorbing material and a sheet-like technology are applied in the field of sheet-like ceramic wave-absorbing materials and their preparation, which can solve the problems of difficulty in achieving impedance matching, inability to provide high magnetic loss, and low saturation magnetization, and achieve good microwave impedance matching characteristics. , the effect of good microwave absorption characteristics, excellent electromagnetic loss characteristics

Active Publication Date: 2020-03-27
HUNAN INSTITUTE OF ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its own perovskite-like structure, the internal magnetic exchange of the structure is weak, showing low saturation magnetization and low magnetic permeability at room temperature; as a wave absorbing material, it cannot provide high magnetic loss, and it is difficult to achieve impedance matching

Method used

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  • Flake like ceramic wave absorbing material and preparation method thereof
  • Flake like ceramic wave absorbing material and preparation method thereof
  • Flake like ceramic wave absorbing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In this embodiment, the sheet-shaped ceramic wave-absorbing material Ba 12-x R x Fe 28 Ti 15 o 84 ( x =3, R is La) is a kind of layered oxide with monoclinic crystal structure, the space group is C 2 / m ; The monoclinic crystal structure is randomly arranged flaky grains with a diameter of 2 to 7 µ m, thickness 1~2 µ m;

[0039] A kind of sheet ceramic absorbing material Ba 12-x R x Fe 28 Ti 15 o 84 ( x =3, R is the preparation method of La), comprises the following steps:

[0040] (1) Preparation of sol: Weigh 11.76g of barium nitrate (98.5% in purity) and 6.50g of lanthanum nitrate hexahydrate (99% in purity) according to the stoichiometric ratio of Ba:La:Fe:Ti: 9:3:28:15 ), 48.48g ferric nitrate nonahydrate (purity 98.5%), 25.53g n-butyl titanate (purity 98%), 700mL deionized water, 17.68g ethylenediaminetetraacetic acid (purity 98%) and 46.49g Citric acid (purity: 98%) was stirred to obtain a uniform mixed solution; ammonia water was added to the mix...

Embodiment 2

[0050] The chemical formula of the sheet-shaped ceramic wave-absorbing material of this embodiment is Ba 12-x R x Fe 28 Ti 15 o 84 ( x =4, R is La), its preparation method comprises the following steps:

[0051] (1) Preparation of sol: Weigh 10.45g of barium nitrate (98.5% in purity) and 8.66g of lanthanum nitrate hexahydrate (99% in purity) according to the stoichiometric ratio of Ba:La:Fe:Ti: 8:4:28:15 ), 48.48g ferric nitrate nonahydrate (purity 98.5%), 25.53g n-butyl titanate (purity 98%), add 700mL deionized water, 66.05g citric acid (purity 98%), and stir to obtain a uniform mixture solution; then add ammonia water to the mixed solution, adjust the pH value to 7, place in a water bath at a constant temperature of 90°C, heat for 5 hours, and stir at 400rpm / min for 5 hours to obtain a stable and uniform precursor sol;

[0052] (2) Preparation of primary powder: Place the sol obtained in step (1) in a drying oven at 120°C and dry for 5 hours to obtain a fluffy black x...

Embodiment 3

[0058] In this embodiment, the sheet-shaped ceramic wave-absorbing material Ba 12-x R x Fe 28 Ti 15 o 84 ( x =2, R is Nd) is a kind of layered oxide with monoclinic crystal structure, the space group is C 2 / m ; The monoclinic crystal structure is randomly arranged plate grains with a diameter of 3-7 µ m, thickness 1~2 µ m;

[0059] A kind of sheet ceramic absorbing material Ba 12-x R x Fe 28 Ti 15 o 84 ( x =2, R is the preparation method of Nd), comprising the following steps:

[0060](1) Preparation of sol: Weigh 13.07g barium nitrate (purity 98.5%) and 4.38g neodymium nitrate hexahydrate (purity 99%) according to Ba:Nd:Fe:Ti stoichiometric ratio 10:2:28:15 , 48.48g ferric nitrate nonahydrate (98.5% purity), 25.53g n-butyl titanate (98% purity) were added to 700mL deionized water, 17.93g ethylenediaminetetraacetic acid (98% purity) and 58.88g lemon Acid (purity: 98%), stirred to obtain a uniform mixed solution; then added ammonia water to the mixed solution, ...

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Abstract

The invention discloses a flake like ceramic wave absorbing material and a preparation method thereof. The chemical formula of the wave absorbing material is Ba<12-x>R<x>Fe<28>Ti<15>O<84>, 2<=x<=4, and R represents rare earth elements: La or Nd. The wave absorbing material is layered oxide having a monoclinic crystal structure, the space group is C2 / m; the monoclinic crystal structure is randomlydistributed sheet shaped or flake like grains, the diameter is 2 to 7 [mu]m, and the thickness is 1 to 2 [mu]m. The invention also provides a preparation method of the wave absorbing material. The preparation method comprises following steps: (1) preparing sol; (2) preparing primary powder; and (3) preparing the waving absorbing material. Due to the sheet / flake like microstructure feature of the wave absorbing material, after the wave absorbing material is doped and modified by magnetic elements, the wave absorbing material has an excellent electromagnetic loss feature and a good microwave impedance matching characteristic; moreover, the wave absorbing material has a good microwave absorbing feature in a range of 2 to 18 GHz; the optimal reflection loss is lower than -17 dB, the reflectionloss is lower than -10 Db, and the frequency band width is greater than 4.0 GHz.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic functional materials, and in particular relates to a sheet-shaped ceramic wave-absorbing material and a preparation method thereof. Background technique [0002] Absorbing materials refer to a class of functional materials that can absorb and attenuate incident electromagnetic waves and convert electromagnetic wave energy into heat energy and dissipate or make electromagnetic waves disappear due to interference. They have been widely used in military, aerospace, communications, electromagnetic protection, electromagnetic fields such as shielding. Excellent absorbing materials should meet the requirements of light weight, thin thickness, strong absorption capacity and wide attenuation frequency bandwidth, and their performance is stable to adapt to the needs of different environments. Therefore, exploring various new absorbing materials and developing absorbing materials with excellent com...

Claims

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Application Information

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IPC IPC(8): C04B35/40C04B35/622C09K3/00
CPCC04B35/2641C04B35/622C04B2235/3215C04B2235/3224C04B2235/3227C04B2235/3232C09K3/00
Inventor 刘胜贺君颜铄清
Owner HUNAN INSTITUTE OF ENGINEERING
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