A kind of sheet-like ceramic wave-absorbing material and its preparation method

A wave-absorbing material and sheet-like technology, applied in the field of sheet-shaped ceramic wave-absorbing materials and their preparation, can solve problems such as difficult to achieve impedance matching, inability to provide high magnetic loss, low saturation magnetization, etc., to achieve improved impedance matching performance, Good microwave absorption characteristics, enhanced magnetic exchange effect

Active Publication Date: 2021-09-21
HUNAN INSTITUTE OF ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A kind of sheet-like ceramic wave-absorbing material and its preparation method
  • A kind of sheet-like ceramic wave-absorbing material and its preparation method
  • A kind of sheet-like ceramic wave-absorbing material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The present embodiment sheet ceramic absorbing material BA 12-x R x FE 28 Ti 15 O 84 ( x = 3, R is LA) is a class of monocluted crystal structure laminated oxides, and the spatial group is C 2 / m The single-oblique crystal structure is a randomly arranged sheet-like crystal grain, a diameter of 2 to 7 µ m, thickness 1 ~ 2 µ M.

[0039] Tablet ceramic absorbing material BA 12-x R x FE 28 Ti 15 O 84 ( x = 3, R is LA) preparation method, including the following steps:

[0040] (1) Preparation of Sol: Press BA: LA: Fe: Ti. The chemometrics ratio of Ti is called 11.76 g of nitrate (98.5% purity), 6.50 g of hexahydrate (purity is 99%) 48.48 g of nine hydrogen nitrate (purity was 98.5%), 25.53 g of titanate niutate (98% purity) was added to 700 ml of deionized water, 17.68 g of ethylenediamine tetracetic acid (98% purity) and 46.49g. Citric acid (purity was 98%), stirring, a uniform mixture; an ammonia water was added to the mixture, adjusted pH to 7, and then heated in a water ba...

Embodiment 2

[0050] The chemical formula of the sheet-shaped ceramic absorbing material is Ba 12-x R x FE 28 Ti 15 O 84 ( x = 4, R is LA), its preparation method includes the following steps:

[0051] (1) Preparation of Sol: Press BA: LA: Fe: Ti. The chemometrics ratio is 8: 4: 28: 15 (98.5% purity), 8.66 g of hexahydrate (purity is 99%) 48.48 g of nine hydrogen nitrate (98.5% purity), 25.53 g of titanate niutate (98% purity) was added to 700 mL of deionized water, 66.05 g of citric acid (98% purity), stirred, resulting in uniform mixing Liquid; then adding ammonia water to the mixture, adjusting pH to 7, a water bath placed at a constant temperature 90 ° C, heating for 5 h, 400 rpm / min, stirring for 5 h, stable and uniform precursor sol;

[0052] (2) Preparation of primary powder: The solution obtained by step (1) at 120 ° C drying tank, dried for 5 h, fluffy black dry gel; then use alcohol to sufficiently burn the dry gel, to coral shape Gray compound; collecting the ashing and ground, pla...

Embodiment 3

[0058] The present embodiment sheet ceramic absorbing material BA 12-x R x FE 28 Ti 15 O 84 ( x = 2, R is Nd) is a class of single-crosstal crystal structure laminated oxide, and the spatial group is C 2 / m The single-oblique crystal structure is a randomly arranged plate-like grain, a diameter of 3 to 7 µ m, thickness 1 ~ 2 µ M.

[0059] Tablet ceramic absorbing material BA 12-x R x FE 28 Ti 15 O 84 ( x = 2, R is ND) preparation method, including the following steps:

[0060](1) Preparation of sol: Press BA: ND: Fe: Ti chemometrics ratio 10: 2: 28: 15, 13.07 g of nitrate (purity is 98.5%), 4.38 g of six hydrogen nitrate (purity is 99%) 48.48 g of nine hydrogen nitrate (purity was 98.5%), 25.53 g of titanate niutate (purity 98%) was added to 700 ml of deionized water, 17.93 g of ethylenediamine tetracetic acid (98%) and 58.88g lemon The acid (purity was 98%), stirred, the uniform mixture was obtained; then an ammonia water was added to the mixture, and the pH value of 7 was adjust...

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Abstract

A kind of sheet ceramic wave-absorbing material and preparation method thereof, the chemical formula of this wave-absorbing material is Ba 12‑x R x Fe 28 Ti 15 o 84 ,in x is 2≤ x ≤4; R in the chemical formula is a rare earth element La or Nd; the absorbing material is a type of layered oxide with a monoclinic crystal structure, and the space group is C 2 / m ; The monoclinic crystal structure is randomly arranged flaky or plate-like grains, with a diameter of 2 to 7 µ m, thickness 1~2 µ m; the present invention also includes the preparation method of the wave-absorbing material, including the following steps: (1) preparation of sol; (2) preparation of primary powder; (3) preparation of wave-absorbing material; The sheet / plate microstructure features and is modified by magnetic element doping, showing excellent electromagnetic loss characteristics and good microwave impedance matching characteristics; the material shows good microwave absorption characteristics in the microwave range of 2~18GHz, the best The frequency bandwidth with return loss values ​​below ‑17dB and return loss below ‑10dB is greater than 4.0GHz.

Description

Technical field [0001] The present invention belongs to the technical field of electromagnetic functional materials, and more particularly to a sheet-like ceramic absorbing material and a preparation method thereof. Background technique [0002] The absorbing material refers to a class of functional materials that can absorb, attenuate the incident electromagnetic wave and disappear with electromagnetic wave energy into thermal energy, and disappear to disappear with electromagnetic pathine, has been widely used in military, aerospace, communication, electromagnetic protection, electromagnetic Shielding and other fields. Excellent absorbing materials should meet the requirements of light, thickness, absorption capacity and attenuation frequency bandwidth, and its performance is stable and adapt to the needs of different environments. Therefore, exploration of various new absorbing materials, absorbing materials excellent in development of comprehensive performance are research ho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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