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A kind of high temperature resistant ferromagnetic wave absorbing agent and its preparation method and its application in the preparation of high temperature resistant ferromagnetic wave absorbing material

A wave absorbing material and ferromagnetic technology, applied in the preparation of high temperature resistant ferromagnetic wave absorbing materials, high temperature resistant ferromagnetic wave absorbing agent and the field of preparation thereof, can solve the problems affecting material performance and service life, composition and structure damage It can solve the problems of high permeability and sintering temperature, and achieve the effect of good wave transmission performance, good interface bonding and low sintering temperature.

Active Publication Date: 2021-10-01
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sintering temperature of traditional ceramic materials is too high, forming is difficult, and it is difficult to obtain applications
[0006] The currently used ferromagnetic wave absorbers are oxidized to varying degrees at high temperatures. This oxidation is irreversible and destructive to the composition and structure of the material, which greatly affects the performance and service life of the material.

Method used

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  • A kind of high temperature resistant ferromagnetic wave absorbing agent and its preparation method and its application in the preparation of high temperature resistant ferromagnetic wave absorbing material
  • A kind of high temperature resistant ferromagnetic wave absorbing agent and its preparation method and its application in the preparation of high temperature resistant ferromagnetic wave absorbing material
  • A kind of high temperature resistant ferromagnetic wave absorbing agent and its preparation method and its application in the preparation of high temperature resistant ferromagnetic wave absorbing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Preparation of high temperature resistant ferromagnetic wave absorber:

[0055] 1. Configure ethanol aqueous solution;

[0056] 2. Preparation of modified ferromagnetic powder: add ferromagnetic powder to the aqueous ethanol solution prepared in step 1, add dropwise a silane coupling agent, and stir in a water bath to obtain a modified ferromagnetic powder suspension;

[0057] 3. Coating the high-temperature dielectric layer: adjusting the pH of the modified ferromagnetic powder suspension obtained in step 2 to 10, adding the dielectric sol solution dropwise, and stirring to react to obtain a high-temperature-resistant ferromagnetic wave-absorbing agent suspension;

[0058] 4. Filter and dry the high-temperature-resistant ferromagnetic wave-absorbing agent suspension obtained in step 3 to obtain high-temperature-resistant ferromagnetic wave-absorbing agent powder.

[0059] The ethanol aqueous solution is prepared by dissolving absolute ethanol in deionized water, where...

Embodiment 2

[0075] Preparation of high temperature resistant ferromagnetic wave absorber:

[0076] 1. Configure ethanol aqueous solution;

[0077] 2. Preparation of modified ferromagnetic powder: add ferromagnetic powder to the aqueous ethanol solution prepared in step 1, add dropwise a silane coupling agent, and stir in a water bath to obtain a modified ferromagnetic powder suspension;

[0078] 3. Coating the high-temperature dielectric layer: adjust the pH of the modified ferromagnetic powder suspension obtained in step 2 to be 7, add the dielectric sol solution dropwise, and stir for reaction to obtain a high-temperature-resistant ferromagnetic wave-absorbing agent suspension;

[0079] 4. Filter and dry the high-temperature-resistant ferromagnetic wave-absorbing agent suspension obtained in step 3 to obtain high-temperature-resistant ferromagnetic wave-absorbing agent powder.

[0080] The ethanol aqueous solution is prepared by dissolving absolute ethanol in deionized water, wherein t...

Embodiment 3

[0095] Using the high temperature resistant ferromagnetic wave absorbing agent prepared in Example 1 to prepare high temperature resistant ferromagnetic wave absorbing material:

[0096] 1) Take high-temperature-resistant ferromagnetic wave absorbing agent and mix evenly with glass-ceramic powder to obtain mixed powder;

[0097] 2) Put the mixed powder obtained in step 1) into a mold and pressurize;

[0098] 3) Under the protection of an inert gas, the temperature is raised for sintering, and after the temperature is lowered, a high-temperature-resistant ferromagnetic wave-absorbing material is obtained.

[0099] Step 1) The glass-ceramic powder is LAS glass-ceramic powder, the particle size of which is 10 μm in diameter and 1 μm in thickness.

[0100] The ratio of the mass of the high-temperature-resistant ferromagnetic wave-absorbing agent to the sum of the mass of the high-temperature-resistant ferromagnetic wave-absorbing agent and the glass-ceramic powder is 1:10.

[01...

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Abstract

The invention discloses a high-temperature-resistant ferromagnetic wave-absorbing agent and its preparation method and its application in the preparation of high-temperature-resistant ferromagnetic wave-absorbing materials, and relates to composite materials suitable for high-temperature-resistant electromagnetic wave absorption and protection. Prepare modified ferromagnetic powder; coat high temperature dielectric layer; filter and dry to obtain high temperature resistant ferromagnetic wave absorbing agent powder. Take the high-temperature resistant ferromagnetic wave absorbing agent and mix it evenly with glass-ceramic powder to obtain the mixed powder; put it into a mold and pressurize; under the protection of inert gas, heat up and sinter, and after cooling down, the high-temperature resistant ferromagnetic wave absorbing material is obtained. The invention adopts the ferromagnetic wave absorbing agent coated with the high-temperature dielectric layer and the wave absorbing matrix of glass ceramics to prepare the wave absorbing material, which has the characteristics of good interface bonding, low sintering temperature and no damage to the ferromagnetic powder morphology.

Description

technical field [0001] The invention relates to a composite material suitable for high temperature resistant electromagnetic wave absorption and protection, in particular to a high temperature resistant ferromagnetic wave absorbing agent and its preparation method and its application in the preparation of high temperature resistant ferromagnetic wave absorbing material. Background technique [0002] With the development of a new generation of aircraft, the requirements of aircraft for absorbing materials have also been further improved. The flight speed of modern fighter jets is getting faster and faster. At present, the flying speed of the world's advanced fifth-generation fighter jets can generally reach Mach 2. The target flying speed of the sixth-generation fighter jets under development is Mach 5. It only takes 7 hours to circle the earth. The aircraft shuttles through the atmosphere at such a high speed, and the friction between the air and the surface of the body prod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02C09K3/00C03C14/00C03B19/06C03C4/08
CPCC09K3/00C03C14/004C03B19/06C03C4/08C03C2214/20C03C2214/08C03C2214/04B22F1/16
Inventor 黄小萧闫旭王千足钟博夏龙张涛
Owner HARBIN INST OF TECH