Composite ferrite material as well as preparation method and application thereof

Abstract

The invention provides a composite ferrite material as well as a preparation method and application thereof, and the preparation method comprises the following steps: (1) mixing a barium source and an iron source raw material to obtain a first mixture; mixing a barium source, an iron source and a substituted metal source raw material to obtain a second mixture; independently and sequentially carrying out pre-sintering, compression molding and primary sintering on the obtained first mixture and the second mixture to respectively obtain an M-type ferrite precursor and a Y-type ferrite precursor; and (2) mixing the M-type ferrite precursor and the Y-type ferrite precursor obtained in the step (1), carrying out secondary sintering treatment, crushing, annealing, and carrying out ultrasonic treatment to obtain the composite ferrite material, wherein the molar weight of the Y-type ferrite precursor is greater than that of the M-type ferrite precursor. The composite ferrite material disclosed by the invention is a composite ferrite material in which Z-type ferrite and Y-type ferrite coexist, and can give consideration to both low dielectric constant and high magnetic conductivity.

Description

technical field [0001] The invention belongs to the technical field of magnetic material preparation, and relates to a composite ferrite material and its preparation method and application. Background technique [0002] With the advent of the 5G era, radio frequency communication technology is more and more widely used. Low dielectric soft magnetic composite material is a functional material with high magnetic permeability and low dielectric constant at ultra-high frequency. It is used in various Antennas, high-frequency small inductors. [0003] Reducing the electromagnetic wavelength can effectively reduce the effective length of the antenna. The electromagnetic wavelength is inversely proportional to the square root of the product of the dielectric constant and magnetic permeability of the antenna, so the dielectric constant and magnetic permeability must be increased, but if the dielectric constant is too large, it will be greatly reduced. The small bandwidth of the ant...

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Problems solved by technology

[0003] Reducing the electromagnetic wavelength can effectively reduce the effective length of the antenna. The electromagnetic wavelength is inversely proportional to the square root of the product of the dielectric constant and magnetic permeability of the antenna, so the dielectric constant and magnetic permeability must be increased, but if the dielectric constant is too large, it will be greatly reduced. The small bandwidth of the antenna is not conducive to the use of the antenna. The traditional ferrite and metal alloy materials have a low cut-off frequency, and the magnetic permeability attenuates seriously at high frequencies, making it difficult to obtain high magnetic permeability; the magnetic permeability and dielectric properties of materials The electrical constant is positively correlated, usually increasing the magnetic permeability, and at the same time the dielectric constant will also increase. Obtaining high magnetic permeability and low dielectric constant is a contradictory problem

[0004] CN106587972A discloses a preparation method of Z-type ferrite flake powder, which adopts molten salt method to prepare raw material flake BaFe 12 o 19 Powder, uniform shape and good dispersion, and then use the template grain growth reaction method to utilize BaFe 12 o 19 The powder was used as a small template to prepare Co 2 Z(Ba 3 co 2 Fe 24 o 41 ) flaky powder, this method needs to add additional barium salt when preparing the M-type precursor, and the barium salt cannot be completely removed in the finished product, and there are many impurities

[0006] The above scheme has the problem of low magnetic permeability or more impurities. Therefore, it is very necessary to develop an ultra-high frequency, high magnetic permeability and low dielectric ferrite material with less impurities.

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