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High-dielectric-constant microwave ferrite material, preparation method and microwave communication device

A ferrite material, high dielectric constant technology, applied in the direction of magnetic materials, electrical components, inorganic material magnetism, etc., can solve the problems of high pre-burning temperature, unfavorable production and environmental protection, etc., to improve the dielectric constant and reduce production. Cost, effect of reducing burn-in temperature and sintering temperature

Pending Publication Date: 2020-06-16
SHENZHEN SUNLORD ELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The microwave ferrite materials with a dielectric constant of 25 or more mentioned in the above patent documents either have 4πMs not in the range of 1850-1950Gs, or contain toxic V 2 o 5 , The pre-burning temperature is high, which is not conducive to production and environmental protection

Method used

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  • High-dielectric-constant microwave ferrite material, preparation method and microwave communication device
  • High-dielectric-constant microwave ferrite material, preparation method and microwave communication device
  • High-dielectric-constant microwave ferrite material, preparation method and microwave communication device

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preparation example Construction

[0048] The preparation method of the high dielectric constant microwave ferrite material of a specific embodiment comprises the following steps:

[0049] 1) According to the molecular formula Bi 1.25 Ca 0.25+2x Y 1.5-2x Zr 0.25 Al x mn y f e4.75-x-y , 0.05≤x≤0.3, 0.05≤y≤0.15. The stoichiometric ratio, calculate the ratio of the required raw materials, weigh the raw materials, the corresponding raw materials are respectively Bi 2 o 3 , CaCO 3 , Y 2 o 3 , ZrO 2 、Al 2 o 3 , Mn 3 o 4 , Fe 2 o 3 . Preferably, the raw materials are all analytically pure, and the Al 2 o 3 and ZrO 2 All are in the nanoscale, and the D50 is 100nm to 200nm.

[0050] 2) Wet ball mill mixing: Put the raw materials weighed in step 1) into the ball mill, add the corresponding zirconium balls and pure water according to the ratio of raw materials: zirconium balls: pure water = 1:2:1.5, and mix evenly at a speed of 200rpm for 4 hours Finally, the discharge is sieved to obtain mixed oxid...

Embodiment 1

[0058] According to molecular formula Bi 1.25 Ca 0.35 Y 1.4 Zr 0.25 Al 0.05 mn 0.05 f e4.65 The stoichiometric ratio, calculate the ratio of the required raw materials, weigh the raw materials, wherein the corresponding raw materials are respectively Bi 2 o 3 , CaCO 3 , Y 2 o 3 , ZrO 2 、Al 2 o 3 , Mn 3 o 4 , Fe 2 o 3 , followed by wet ball milling, drying and sieving, 900°C heat preservation for 5 hours, pre-calcination, wet ball milling, spray granulation, compression molding, and finally sintering at 1080°C and heat preservation for 5 hours to obtain microwave ferrite materials. After testing, the characteristics of the microwave ferrite material: the sintered density is 5.97g / cm 3 , ε=27.8, 4πMs=1950Gs, ΔH=45Oe, Tc=202°C.

Embodiment 2

[0060] According to molecular formula Bi 1.25 Ca 0.45 Y 1.3 Zr 0.25 Al 0.1 mn 0.05 f e4.6The stoichiometric ratio is calculated, the ratio of the required raw materials is calculated, the raw materials are weighed, and then mixed by wet ball milling, dried and sieved, pre-fired at 800°C for 5 hours, finely ground by wet ball milling, spray granulation, compression molding, and finally in The microwave ferrite material was obtained by sintering at 1030° C. and holding for 5 hours. After testing, the characteristics of the microwave ferrite material: the sintered density is 5.96g / cm 3 , ε=28.1, 4πMs=1912Gs, ΔH=47Oe, Tc=225°C.

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Abstract

The invention discloses a high-dielectric-constant microwave ferrite material, a preparation method and a microwave communication device. The chemical formula of the microwave ferrite material is Bi<1.25>Ca<0.25+2x>Y<1.5-2x>Zr<0.25>Al<x>Mn<y>Fe<4.75-x-y>, x is greater than or equal to 0.05 and less than or equal to 0.3, and y is greater than or equal to 0.05 and less than or equal to 0.15. The preparation method comprises the following steps: preparing raw materials according to the molecular formula Bi<1.25>Ca<0.25+2x>Y<1.5-2x>Zr<0.25>Al<x>Mn<y>Fe<4.75-x-y> (0.05<=x<=0.3, and 0.05<=y<=0.15),and preparing the microwave ferrite material by using the raw materials. The dielectric constant of the high-dielectric-constant microwave ferrite material is about 28, 4piMs is 1850-1950 Gs, delta His 45-50 Oe, Tc is 200 DEG C or above, and the miniaturization and integration application of a microwave circulator and an isolator can be well met.

Description

technical field [0001] The invention relates to the field of microwave communication magnetic materials, in particular to a high dielectric constant microwave ferrite material, a preparation method and a microwave communication device. Background technique [0002] 5G communication is an important part of the future information infrastructure. This technology requires microwaves as the means of transmission. Therefore, microwave ferrite circulators and isolators are indispensable basic devices. The key to the miniaturization and integration of circulator isolators is to use a microwave ferrite material with high dielectric constant, suitable 4πMs and Tc, △H. [0003] The dielectric constant of the existing microwave ferrite is between 12 and 16, and the device size is too large when designing low-frequency circulator isolators, which cannot meet the needs of miniaturization and integration. If the dielectric constant of the ferrite is increased to more than 25, the size of ...

Claims

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Application Information

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IPC IPC(8): C04B35/40H01F1/03
CPCC04B35/2633C04B35/2641C04B2235/3217C04B2235/3225C04B2235/3244C04B2235/3263C04B2235/3298C04B2235/442C04B2235/483C04B2235/608C04B2235/6562C04B2235/6567C04B2235/96H01F1/0315
Inventor 刘剑聂敏王颖欣
Owner SHENZHEN SUNLORD ELECTRONICS
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