Microwave ferrite material with high dielectric constant as well as preparation method and application of microwave ferrite material

A high dielectric constant, ferrite material technology, applied in inductor/transformer/magnet manufacturing, magnetic materials, inorganic material magnetism, etc. Good grain size distribution, avoid excessive sintering temperature, reduce porosity

Active Publication Date: 2021-06-15
SUZHOU IND PARK KAYMAX PRECISION ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dielectric constant of the narrow-linewidth high-permittivity microwave ferrite still cannot exceed 15, which is difficult to meet the miniaturization and lightweight requirements of 5G circulators

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] This embodiment provides a preparation method of a high dielectric constant microwave ferrite material, the composition chemical formula of the high dielectric constant microwave ferrite material is Y 3 Bi a Ca b sn c al d SM e Cu f Fe 5 V g o 12, where a is 0.5, b is 0.15, c is 0.3, d is 0.55, e is 0.15, f is 0.07, g is 0.4;

[0062] Described preparation method comprises the steps:

[0063] (1) Mix and prepare raw materials according to the formula quantity, and wet ball mill to obtain a mixture with an average particle diameter of 50 μm; use absolute ethanol to immerse the raw materials during the wet ball milling; the prepared raw materials include Y 2 o 3 、 Bi 2 o 3 , CaCO 3 , SnO 2 , Al(OH) 3 、Sm 2 o 3 , CuO, Fe 2 o 3 and V 2 o 5 ;

[0064] (2) Pre-sintering the mixture obtained in step (1) under an electric field strength of 500V / cm to obtain a pre-sintering material; the pre-sintering temperature is 700°C, and the pre-sintering time is 1.5h...

Embodiment 2

[0069] This embodiment provides a preparation method of a high dielectric constant microwave ferrite material, the composition chemical formula of the high dielectric constant microwave ferrite material is Y 3 Bi a Ca b sn c al d SM e Cu f Fe 5 V g o 12 , where a is 0.5, b is 0.15, c is 0.3, d is 0.55, e is 0.15, f is 0.07, g is 0.4;

[0070] Described preparation method comprises the steps:

[0071] (1) Mix the preparation raw materials according to the formula quantity, and wet ball mill to obtain a mixture with an average particle diameter of 30 μm; use absolute ethanol to immerse the raw materials during the wet ball milling; the preparation raw materials include Y 2 o 3 、 Bi 2 o 3 , CaCO 3 , SnO 2 , Al(OH) 3 、Sm 2 o 3 , CuO, Fe 2 o 3 and V 2 o 5 ;

[0072] (2) Pre-sintering the mixture obtained in step (1) under an electric field strength of 400V / cm to obtain a pre-sintering material; the pre-sintering temperature is 800°C, and the pre-sintering time...

Embodiment 3

[0077] This embodiment provides a preparation method of a high dielectric constant microwave ferrite material, the composition chemical formula of the high dielectric constant microwave ferrite material is Y 3 Bi a Ca b sn c al d SM e Cu f Fe 5 V g o 12 , where a is 0.5, b is 0.15, c is 0.3, d is 0.55, e is 0.15, f is 0.07, g is 0.4;

[0078] Described preparation method comprises the steps:

[0079] (1) Mix and prepare raw materials according to the formula quantity, and wet ball mill to obtain a mixture with an average particle size of 80 μm; use absolute ethanol to immerse the raw materials during the wet ball milling; the prepared raw materials include Y 2 o 3 、 Bi 2 o 3 , CaCO 3 , SnO 2 , Al(OH) 3 、Sm 2 o 3 , CuO, Fe 2 o 3 and V 2 o 5 ;

[0080] (2) Pre-sintering the mixture obtained in step (1) under an electric field strength of 600V / cm to obtain a pre-sintering material; the pre-sintering temperature is 600°C, and the pre-sintering time is 2h;

...

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Abstract

The invention provides a microwave ferrite material and a preparation method with a high dielectric constant and application thereof. According to the high-dielectric-constant microwave ferrite material, the dielectric constant is increased through synergistic addition of Sn<4+>, Al<3+> and Sm<3>, the saturation magnetization of the obtained material ranges from 1800 Gs to 2000 Gs, and the dielectric constant is 18 or above; through synergistic addition of Bi<3+> and Cu<2+>, the sintering temperature of the material is reduced, so excessive growth of crystal grains caused by too high sintering temperature and too long sintering time is avoided, formation of the ferrite material with good crystal grain size distribution is facilitated, the Curie temperature of the material is 180 DEG C or above, and the resonance line width of the material does not exceed 28 Oe; the preparation method is simple to operate; and through grading, the bonding strength of the material is improved, the porosity in the ferrite material is reduced, and the ferromagnetic resonance line width of finally obtained garnet ferrite is reduced. The ferrite material provided by the invention can meet the requirements of a 5G base station circulator for miniaturization and light weight.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials, and relates to a ferrite material and its preparation method and application, in particular to a high dielectric constant microwave ferrite material and its preparation method and application. Background technique [0002] The circulator is an important part of the 5G base station. The ferrite material is the main component of the circulator. The main raw material of the ferrite material is yttrium iron garnet ferrite. As the core part of the circulator, the ferrite material directly determines the performance of the circulator. [0003] In recent years, with the rapid development of 5G communication technology, the requirements for miniaturization and light weight of devices have become more and more urgent, and the volume of ferrite components is much higher than other components, so its miniaturization and light weight tasks Particularly important. Increasing the dielectric consta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/40H01F1/03H01F41/02
CPCC04B35/2608H01F1/0315H01F41/02C04B2235/3225C04B2235/3298C04B2235/442C04B2235/3293C04B2235/3218C04B2235/3224C04B2235/3281C04B2235/3239C04B2235/96
Inventor 王春明张典鹏王昆仑谢国辉
Owner SUZHOU IND PARK KAYMAX PRECISION ENG
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