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Oxide composite material and preparation method and application thereof

A composite material and oxide technology, applied in the field of wave absorbing materials, can solve the problems of limited use, insufficient effective absorption frequency band, etc., and achieve the effects of increasing electrical conductivity, good wave absorbing effect, and convenient operation.

Pending Publication Date: 2022-06-17
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the effective absorption frequency band of many oxide composite materials is only 2GHz, and the effective absorption frequency band is not wide enough, which brings great limitations to the actual use.

Method used

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  • Oxide composite material and preparation method and application thereof
  • Oxide composite material and preparation method and application thereof
  • Oxide composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of oxide composites:

[0030] (1) Dissolve 0.39g of samarium nitrate, 2.95g of calcium acetate, 3.56g of iron nitrate and 3.16g of manganese nitrate in 45mL of deionized water, then add 11.13g of citric acid as an organic complexing agent, and form a brownish brown under the action of a mechanical stirrer. Yellow solution to obtain metal-citric acid solution;

[0031] (2) aging the metal-citric acid solution in a constant temperature water bath at 80°C and stirring for 3 hours under the action of a magnetic stirrer to obtain a precursor gel;

[0032] (3) putting the precursor gel into a blast drying oven and drying at 80°C for 10 hours to obtain a dry gel;

[0033] (4) pre-calcining the xerogel at 200° C. for 10 minutes to obtain a black precursor powder;

[0034](5) Put the black precursor powder into a muffle furnace for a second calcination at 750°C for 10h to obtain the oxide composite material Sm 0.05 Ca 0.95 Fe 0.5 Mn 0.5 O 3-x .

Embodiment 2

[0036] Preparation of oxide composites:

[0037] (1) Dissolve 0.76g of samarium nitrate, 3.02g of calcium acetate, 2.77g of iron nitrate and 3.07g of manganese nitrate in 45mL of deionized water, then add 10.82g of citric acid as a complexing agent, and form a brownish yellow under the action of a mechanical stirrer solution to obtain a metal-citric acid solution;

[0038] (2) aging the metal-citric acid solution in a constant temperature water bath at 80°C and stirring for 3 hours under the action of a magnetic stirrer to obtain a precursor gel;

[0039] (3) putting the precursor gel into a blast drying oven and drying at 80°C for 10 hours to obtain a dry gel;

[0040] (4) pre-calcining the xerogel at 200° C. for 10 minutes to obtain a black precursor powder;

[0041] (5) Put the black precursor powder into a muffle furnace for a second calcination at 750°C for 10h to obtain the oxide composite material Sm 0.1 Ca 0.9 Fe 0.5 Mn 0.5 O 3-x .

Embodiment 3

[0043] Preparation of oxide composites:

[0044] (1) Dissolve 1.09g of samarium nitrate, 2.45g of calcium acetate, 3.31g of iron nitrate and 2.93g of manganese nitrate in 45mL of deionized water, then add 10.32g of citric acid as a complexing agent, and form a brownish yellow under the action of a mechanical stirrer solution to obtain a metal-citric acid solution;

[0045] (2) aging the metal-citric acid solution in a constant temperature water bath at 80°C and stirring for 3 hours under the action of a magnetic stirrer to obtain a precursor gel;

[0046] (3) putting the precursor gel into a blast drying oven and drying at 80°C for 10 hours to obtain a dry gel;

[0047] (4) pre-calcining the xerogel at 200° C. for 10 minutes to obtain a black precursor powder;

[0048] (5) Put the black precursor powder into a muffle furnace for a second calcination at 750°C for 10h to obtain the oxide composite material Sm 0.15 Ca 0.85 Fe 0.5 Mn 0.5 O 3-x .

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Abstract

The invention provides an oxide composite material and a preparation method thereof, and relates to the technical field of wave-absorbing materials. The oxide composite material is a SmCaFeMnO wave-absorbing material, and the molecular formula of the oxide composite material is SmyCa1-yFe0. 5Mn0. 5O3-x. The preparation method mainly comprises the steps of mixing, aging, calcining and the like, the defects in the prior art are overcome, the obtained wave-absorbing material can absorb electromagnetic waves within the microwave band of 2-14 GHz, the absorption frequency band is wide, the absorption efficiency is high (larger than 90%), and the wave-absorbing material can be applied to the field of electromagnetic wave absorption. And the wave-absorbing material has good thermal stability and oxidation resistance, and the material is simple in preparation process and suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of wave absorbing materials, in particular to an oxide composite material and a preparation method and application thereof. Background technique [0002] At present, electromagnetic radiation pollution has attracted more and more attention. Radio frequency components in electronic equipment can be seen everywhere, which not only affects the signal quality and stability between various electronic equipment, but also causes accidents caused by disturbance of electromagnetic signals. More serious long-term harm to human health. [0003] Absorbing materials have important applications in electromagnetic radiation protection, electromagnetic shielding, and stealth materials, and are generally made of substances with electrical or magnetic losses. These absorbing substances are often added to coatings or matrix materials to make absorbing coatings or absorbing composite materials, and the design of absorbing mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00C09K3/00
CPCC01G49/0054C09K3/00C01P2002/72
Inventor 成丽春向日陈宇成姚青荣卢照邓健秋周怀营
Owner GUILIN UNIV OF ELECTRONIC TECH