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A kind of high microwave absorption spinel type ferrite and silver composite material and preparation method

A composite material and microwave absorption technology, which is applied in chemical instruments and methods, and other chemical processes, can solve the problems of reducing microwave reflection and microwave transmission, and achieve the effects of improving microwave absorption performance, convenient operation, and reducing microwave reflection

Active Publication Date: 2022-02-22
SHENYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, there are few reports on the research of reducing microwave reflection and microwave transmission by using silver and ferrite composite materials to generate composite materials. The present invention provides a novel spinel-type ferrite and silver composite material, which has higher Electrical conductivity, the polarization between silver and ferrite, thus effectively improving the microwave absorption performance of the material

Method used

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  • A kind of high microwave absorption spinel type ferrite and silver composite material and preparation method
  • A kind of high microwave absorption spinel type ferrite and silver composite material and preparation method
  • A kind of high microwave absorption spinel type ferrite and silver composite material and preparation method

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Effect test

Embodiment 1

[0034] 1. Preparation of rare earth nitrate: weigh a certain amount of Sm 2 o 3 , dissolve it in a certain amount of nitric acid, wait until it is completely dissolved, and evaporate all the remaining nitric acid to form Sm(NO 3 ) 3 ;

[0035] 2.1 Prepare 1mol / l glucose, ferric nitrate, nickel chloride, Sm(NO 3 ) 3 500ml each solution;

[0036] 2.2. Preparation of glucose, ferric nitrate, nickel chloride, Sm(NO 3 ) 3 Mixed solution: according to the molar ratio of the following substances, glucose: (Ni 2++Fe 3+ +Sm 3+ )=5:1; Sm 3+ : Fe 3+ = x: 2-x; Ni 2+ :(Fe 3+ +M 3+ )=1:2; Measure a certain amount of the above solution in a certain amount of deionized water to prepare a mixed solution, x is respectively 0, 0.02, 0.04, 0.06, 0.08, and the total substance concentration of the mixed solution is 0.8mol / l;

[0037] 3. According to the ratio of substances, glucose: Ag + = 59:1 ratio Measure a certain amount of 0.2mol / l silver nitrate and add it dropwise to the mi...

Embodiment 2

[0043] 1. Prepare 1mol / l glucose, ferric nitrate, nickel chloride, Ce(NO 3 ) 3 500ml each solution;

[0044] 2. Preparation of glucose, ferric nitrate, nickel chloride, Ce(NO 3 ) 3 Mixed solution: according to the molar ratio of the following substances, glucose: (Ni 2+ +Fe 3+ +Ce 3+ )=5:1; Ce 3+ : Fe 3+ = x: 2-x; Ni 2+ :(Fe 3+ +M 3+ )=1:2; Measure a certain amount of the above solution in a certain amount of deionized water to prepare a mixed solution. l;

[0045] 3. According to the ratio of substances, glucose: Ag + =59:1 ratio Measure a certain amount of 0.1mol / l silver nitrate and add it dropwise to the mixed solution prepared in step 2, stir magnetically for 100 minutes to make it fully mixed;

[0046] 4. Hydrothermal reaction: put the mixed solution prepared in step 3 into a polytetrafluoroethylene-lined high-pressure reactor at 200°C, conduct a hydrothermal reaction for 20 hours, then cool to room temperature and suction filter, wash, and dry. For: drying...

Embodiment 3

[0051] 1. Preparation of rare earth nitrate: weigh a certain amount of Gd 2 o 3 , dissolve it in a certain amount of nitric acid, wait until it is completely dissolved, and evaporate all the remaining nitric acid to form Gd(NO 3 ) 3 ;

[0052] 2.1. Prepare 1mol / l glucose, ferric nitrate, nickel chloride, Gd(NO 3 ) 3 500ml each solution;

[0053] 2.2. Preparation of glucose, ferric nitrate, nickel chloride, Gd(NO 3 ) 3 Mixed solution: according to the molar ratio of the following substances, glucose: (Ni 2+ +Fe 3+ +Gd 3+ )=8:1, Gd 3+ : Fe 3+ = x: 2-x; Ni 2+ :(Fe 3+ +M 3+ )=1:2; Measure a certain amount of the above solution in a certain amount of deionized water to prepare a mixed solution, x is respectively 0, 0.02, 0.04, 0.06, 0.08, and the total substance concentration of the mixed solution is 0.8mol / l;

[0054] 3. According to the ratio of substances, glucose: Ag + = 59:1 ratio Measure a certain amount of 0.2mol / l silver nitrate and add it dropwise to the ...

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Abstract

The invention provides a novel high microwave absorbing composite material and a preparation method thereof, which belong to the technical field of electromagnetic absorbing materials, and the chemical formula of the composite material is Ag / NiFe 2‑x m x o 4 , wherein M is a rare earth element, x=0~0.08, the preparation method makes elemental silver and ferrite composite to form a composite wave-absorbing material while preparing rare earth ion-doped spinel ferrite; the present invention passes +3 The substitution of valent rare earth ions and the introduction of silver can effectively adjust the coercive force of spinel ferrite, improve the magnetic absorption and greatly improve the electrical absorption of the material, reduce microwave reflection and microwave transmission, and improve the microwave absorption performance of the material. The obtained product has high purity, good crystal phase, simple process, few steps, convenient operation, energy saving, and can realize industrialized production.

Description

technical field [0001] The invention relates to the field of microwave-absorbing composite materials, in particular to a high-microwave-absorbing spinel-type ferrite-silver composite material and a preparation method. Background technique [0002] Spinel-type ferrite has ferrimagnetism, cubic crystal structure, and belongs to the Fd-3m space group. Spinel ferrite has high magnetic permeability, high resistivity and high dielectric properties at high frequencies, and is a good magnetic material. Because of its high coercive force, stable chemical properties and mild saturation magnetization field, it is recognized as one of the most promising absorbing materials. Reflection of microwave electromagnetic radiation at the surface of spinel ferrite and its doped spinel ferrite is weakened due to magnetic and dielectric absorption. Changing the electromagnetic properties can change the microwave absorption capacity of spinel ferrite. [0003] The chemical formula of spinel ferr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 刘颖张洪波赵坤金佳惠刘跃
Owner SHENYANG NORMAL UNIV