CN-117512454-B - FeSiAlGd wave-absorbing material and preparation method thereof

Abstract

The invention provides FeSiAlGd wave-absorbing material and a preparation method thereof, and relates to the technical field of microwave absorbing materials. The molecular formula of the FeSiAlGd wave-absorbing material is Fe x Si 29.6 Al 5.4 Gd y , wherein x is 57< x is not less than 65,0 and y is not less than 8, the wave-absorbing material of the component can absorb electromagnetic waves in a microwave band of 2-18 GHz, the effective absorption frequency band is wide, the absorption efficiency is high (> 90%), the heat stability of the wave-absorbing material is excellent, meanwhile, the FeSiAlGd wave-absorbing material can be obtained through arc melting, heat treatment and ball milling, the synthesis process is simple, and the wave-absorbing material is suitable for large-scale industrial production.

Inventors

• Long Qianxin
• XU XIAOXI
• Pan Baiyang
• ZHANG ZHAOYU
• CHENG LICHUN
• YAO QINGRONG
• DENG JIANQIU

Assignees

• 桂林电子科技大学

Dates

Publication Date

20260512

Application Date

20231027

Claims (8)

1. 1. The FeSiAlGd wave-absorbing material is characterized in that the molecular formula of the FeSiAlGd wave-absorbing material is Fe x Si 29.6 Al 5.4 Gd y , wherein x is 57< x less than or equal to 65, y is 0< y less than or equal to 8, and the FeSiAlGd wave-absorbing material is prepared by a preparation method comprising the following steps: (1) Weighing metal iron, silicon, aluminum and gadolinium in proportion, and carrying out arc melting in a non-consumable vacuum arc furnace to obtain a metal ingot for standby; (2) Carrying out heat treatment on the metal ingot, wherein the heat treatment temperature is 800 ℃, the heat treatment time is 4 days, and then carrying out coarse crushing and grinding in a sample smashing tank to obtain metal powder; (3) And ball-milling the metal powder to obtain FeSiAlGd wave-absorbing material.
2. 2. A method for preparing FeSiAlGd wave-absorbing material as defined in claim 1, comprising the steps of: (1) Weighing metal iron, silicon, aluminum and gadolinium in proportion, and carrying out arc melting in a non-consumable vacuum arc furnace to obtain a metal ingot for standby; (2) Carrying out heat treatment on the metal ingot, wherein the heat treatment temperature is 800 ℃, the heat treatment time is 4 days, and then carrying out coarse crushing and grinding in a sample smashing tank to obtain metal powder; (3) And ball-milling the metal powder to obtain FeSiAlGd wave-absorbing material.
3. 3. The method for producing a FeSiAlGd wave-absorbing material according to claim 2, wherein the purity of the metallic iron, silicon, aluminum and gadolinium is 99.9% or more.
4. 4. The method for producing a FeSiAlGd wave-absorbing material according to claim 2, wherein the melting loss rate of the melted ingot is less than 1wt.%.
5. 5. The method of claim 2, wherein the vacuum level of arc melting in the step (1) is less than 3x10 -3 Pa.
6. 6. The method of claim 2, wherein the metal ingot in the step (2) is subjected to tube sealing before heat treatment.
7. 7. The method of claim 2, wherein the metal powder after coarse crushing and grinding in the step (2) is poured into an agate mortar for grinding and sieving with a 100-mesh sieve.
8. 8. The method for preparing FeSiAlGd. The wave-absorbing material according to claim 2, wherein the rotational speed of ball milling in the step (3) is 260-360 r/min, and the ball milling time is 20h.

Description

FeSiAlGd wave-absorbing material and preparation method thereof Technical Field The invention relates to the technical field of microwave absorbing materials, in particular to FeSiAlGd wave absorbing materials and a preparation method thereof. Background With the development of modern science and technology, various electronic and electric equipment bring high efficiency for social production and great convenience for daily life of people. On the other hand, electromagnetic radiation generated by the wide application of electromagnetic waves in science and technology also brings new social problems, and the electromagnetic radiation has become a new pollution source which has great harm to water sources, atmosphere and noise and is not easy to prevent. Electromagnetic radiation not only affects normal communication, but also directly jeopardizes human health, and becomes a hot spot of concern in the current society and scientific community. In addition, electromagnetic radiation can also adversely affect electronic devices. If the high-frequency equipment, especially the high-power high-frequency equipment, outputs high power during the working period, the formed high-frequency radiation is very strong, and serious interference and even abnormal working can be caused to other electronic equipment, instruments, communication signals and the like around the high-frequency equipment, so that serious consequences are caused. In order to solve the above problems, the development of a wave absorbing material having a good absorbing effect on electromagnetic waves has been a hot spot of current research. At present, the novel wave-absorbing material needs to meet the characteristics of thinness, lightness, width, strength and the like, and the future wave-absorbing material needs to meet the higher requirements of multispectral stealth, environmental adaptation, high temperature resistance, marine climate resistance, nuclear radiation resistance, impact resistance and the like. Current research on wave-absorbing materials is mainly focused on ferrite and magnetic metals. Ferrite is a ferromagnetic material, but its low saturation magnetization and low curie temperature limit its application in high temperature environments. The magnetic metal wave absorbing material has strong conductivity, and the magnetic loss and the dielectric loss are both larger than those of ferrite. Compared with ferrite, the magnetic metal absorber has the advantages of high saturation magnetization, high magnetic permeability, strong electromagnetic wave attenuation capability, simple preparation process and the like. Therefore, the magnetic metal is expected to become a wave-absorbing material with stronger wave-absorbing capacity. The microwave electromagnetic parameters of the composite material can be adjusted by adjusting the morphology and the crystal structure of the flaky metal powder so as to achieve better absorption effect and meet the requirements of effective absorption bandwidth, thin thickness, strong wave absorption performance and light weight. Unlike Fe, co, ni and other transition elements, RE has excellent cis-magnetic susceptibility, saturation magnetization, magnetocrystalline anisotropy, magnetostriction and other performance. Therefore, the electromagnetic parameters of the wave-absorbing material are adjusted and optimized by utilizing the characteristics of the rare earth elements, and the wave-absorbing performance of the wave-absorbing material can be obviously improved. The development of the high-performance low-frequency rare earth magnetic wave-absorbing material widens the application field and value of the rare earth, and has important significance for the communication field and the national security of China. However, the absorption band of the existing rare earth magnetic wave-absorbing material is narrower, and the absorption efficiency needs to be improved. Disclosure of Invention The invention provides a FeSiAlGd wave-absorbing material and a preparation method thereof, and the wave-absorbing material has the advantages of wide absorption frequency band, high absorption efficiency, good thermal stability and good oxidation resistance. In order to achieve the above purpose, the invention is realized by the following technical scheme: FeSiAlGd wave-absorbing material has a molecular formula of Fe xSi29.6Al5.4Gdy, wherein x is 57< x is less than or equal to 65,0 and y is less than or equal to 8. The molecular formula of FeSiAlGd wave-absorbing material is preferably Fe (57～63)Si29.6Al5.4Gd(2～8), more preferably Fe (57～61)Si29.6Al5.4Gd(4～8), and most preferably Fe 57 Si29.6Al5.4Gd6. A preparation method of FeSiAlGd wave-absorbing material comprises the following steps: (1) Weighing metal iron, silicon, aluminum and gadolinium in proportion, and carrying out arc melting in a non-consumable vacuum arc furnace to obtain a metal ingot for standby; (2) Carrying out heat treatment on the metal ingot, and the