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Double-phase soft magnetic ferrite low-frequency wave-absorbing device and preparation method thereof

A soft ferrite and device technology, used in electrical components, antennas, etc., can solve the problems of thick absorber and poor absorber performance, and achieve the effects of high density, low cost, and good corrosion resistance.

Pending Publication Date: 2022-04-26
LANZHOU UNIVERSITY
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Problems solved by technology

This requires the absorbing device to have a high value and good impedance matching characteristics For most absorbing materials, usually because of their magnetic permeability (μ r ) is low and the absorber is too thick, or because the dielectric constant is much greater than the magnetic permeability, the impedance mismatch causes the absorbing performance to deteriorate
Therefore, traditional soft magnetic absorbing materials cannot achieve efficient absorption of electromagnetic waves in the 100 MHz band.

Method used

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  • Double-phase soft magnetic ferrite low-frequency wave-absorbing device and preparation method thereof
  • Double-phase soft magnetic ferrite low-frequency wave-absorbing device and preparation method thereof
  • Double-phase soft magnetic ferrite low-frequency wave-absorbing device and preparation method thereof

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Embodiment 1

[0037] Embodiment 1. Two-phase soft ferrite low-frequency wave absorbing device Ba(CoTi) X Fe 12-X o 19 -BiFeO 3 The preparation and characterization of

[0038] (1) prepare soft magnetic ferrite powder with solid state reaction method, described soft ferrite is Ba(CoTi) X Fe 12- X o 19 , in this embodiment X is 1.2;

[0039] (2) the soft magnetic ferrite Ba(CoTi) that step (1) obtains is obtained in the mode of adopting planetary ball mill 1.2 Fe 9.6 o 19 The powder is ground and passed through a 300-mesh sieve to obtain Ba(CoTi) with a particle size of 0.1 μm to 2 μm 1.2 Fe 9.6 o 19 Powder; preferably 0.5 μm to 0.8 μm. It should be understood that when preparing Ba(CoTi) in the method of the present invention 1.2 Fe9 .6 o 19 During micropowder, not all of the prepared micropowders fall within the particle size range described here, but most of them, such as more than 80%, preferably more than 90%, fall within the particle size parameter range described here ...

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Abstract

The invention relates to the technical field of microwave absorber preparation, in particular to a double-phase soft magnetic ferrite low-frequency wave-absorbing device and a preparation method thereof. The wave absorbing device is made of soft magnetic ferrite and oxide; the soft magnetic ferrite is Ba (CoTi) XFe12-XO19, X ranges from 0.9 to 1.8, soft magnetic ferrite powder with a certain particle size is prepared, and the particle size distribution ranges from 0.1 micrometer to 2 micrometers. The mass fraction of the oxide powder is 0.5%-10%; the soft magnetic ferrite powder and the oxide powder are uniformly mixed, prepared into blocks and sintered, so that the blocks are highly densified, and a dielectric phase capable of adjusting electromagnetic parameters is formed. The low-frequency wave absorbing device is suitable for the frequency band of 100 MHz to 1 GHz. The wave-absorbing ceramic prepared by the method has the advantages of high density, high magnetic conductivity, excellent wave-absorbing performance, high mechanical strength, good corrosion resistance, high temperature resistance and chemical stability.

Description

technical field [0001] The invention relates to the technical field of preparation of microwave absorbers, and more particularly relates to a dual-phase soft ferrite low-frequency microwave absorbing device and a preparation method thereof. Background technique [0002] In recent years, with the widespread popularization of microwave technology, the operating frequency of a large number of microwave equipment falls in the 100 MHz band. Therefore, it is very important to develop microwave absorbing devices with excellent absorbing properties in this frequency band. As we all know, most of the current research mainly focuses on microwave absorbing materials and microwave absorption properties in the gigahertz band, while there are relatively few studies on the hundreds of megahertz band. The fundamental reason is that the microwave wavelengths in this frequency band are longer, making absorption more difficult. According to the transmission line theory and interface interfer...

Claims

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Application Information

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IPC IPC(8): H01Q17/00C04B35/32C04B35/622
CPCH01Q17/004C04B35/2633C04B35/622C04B2235/3272C04B2235/3298C04B2235/77C04B2235/95
Inventor 王涛徐志彪刘畅王国武
Owner LANZHOU UNIVERSITY
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