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LiZn ferrite material for Ka-band phase shifter and preparation method thereof

A technology for ferrite materials and phase shifters, which is applied in the field of LiZn ferrite materials and preparations for Ka-band phase shifters, can solve the problems of increased dielectric loss, composition segregation, low coercive force, etc., and achieve low ferromagnetism Effects of Resonant Linewidth, High Saturation Magnetization, and Low Dielectric Loss

Active Publication Date: 2013-06-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation of Li-based ferrite has the following problems: 1) When sintering at a higher temperature, high saturation magnetization and low coercive force can be obtained, but the rectangular shape is relatively poor. In particular, Li volatilization is accompanied by high-temperature sintering. Cause material composition segregation, produce Fe 2+ ions, the resistivity of the material is greatly reduced, and the dielectric loss is significantly increased; 2) If sintering at a lower temperature, Li volatilization can be avoided, but the density is low, which is not conducive to obtaining high saturation magnetization and low coercive force

Method used

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  • LiZn ferrite material for Ka-band phase shifter and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Main formula: with Li 0.35+x Zn 0.3 Fe 2.28 mn 0.07 o 4+δ Molecular formula calculation, x=0.05, x=2δ; main material is Fe 2 o 3 , ZnO, Li 2 CO 3 , Mn 3 o 4 ;

[0034] 2) Primary ball milling: mill the raw materials used in step 1) in a ball mill for 2 hours to make the powder mix evenly;

[0035] 3) Pre-burning: Pre-burning the ball abrasive obtained in step 2) in a furnace at 810°C for 2 hours;

[0036] 4) Doping: Add additive 1.2wt% Bi to the powder obtained in step 3) by weight 2 o 3 , 0.4wt% NiO, 0.2wt% V 2 o 5 , milling the powder in a planetary ball mill for 3 hours;

[0037] 5) molding: adding 15wt% organic binder to the powder obtained in step 4) according to the weight ratio, mixing evenly, and after granulating, pressing the granular powder into a blank on a press;

[0038] 6) Atmosphere sintering: the blank obtained in step 5) was sintered in an atmosphere sintering furnace at a temperature of 1000° C. for 3 hours in an oxygen atmosphere. ...

Embodiment 2

[0049] 1) with Li 0.35+x Zn 0.3 Fe 2.28 mn 0.07 o 4+δ Molecular formula calculation, x=0.10, x=2δ; main material is Fe 2 o 3 , ZnO, Li 2 CO 3 , Mn 3 o 4 ;

[0050] 2) Primary ball milling: mill the raw materials used in step 1) in a ball mill for 2 hours to make the powder mix evenly;

[0051] 3) Pre-burning: Pre-burning the ball abrasive obtained in step 2) in a furnace at 810°C for 2 hours;

[0052] 4) Doping: Add additive 1.0wt% Bi to the powder obtained in step 3) by weight 2 o 3 , 0.3wt% NiO, 0.3wt% V 2 o 5 , milling the powder in a planetary ball mill for 3 hours;

[0053] 5) molding: adding 15wt% organic binder to the powder obtained in step 4) according to the weight ratio, mixing evenly, and after granulating, pressing the granular powder into a blank on a press;

[0054] 6) Atmosphere sintering: the blank obtained in step 5) was sintered at 1030° C. for 2.5 hours in an atmosphere sintering furnace in an oxygen atmosphere.

[0055] The LiZn ferrite ma...

Embodiment 3

[0065] 1) with Li 0.35+x Zn 0.3 Fe 2.28 mn 0.07 o 4+δ Molecular formula calculation, x=0.15, x=2δ; main material is Fe 2 o 3 , ZnO, Li 2 CO 3 , Mn 3 o 4 ;

[0066] 2) Primary ball milling: mill the raw materials used in step 1) in a ball mill for 2 hours to make the powder mix evenly;

[0067] 3) Pre-burning: Pre-burning the ball abrasive obtained in step 2) in a furnace at 810°C for 2 hours;

[0068] 4) Doping: Add additive 1.2wt% Bi to the powder obtained in step 3) by weight 2 o 3 , 0.3wt% NiO, 0.25wt% V 2 o 5 , milling the powder in a planetary ball mill for 3 hours;

[0069]5) molding: adding 15wt% organic binder to the powder obtained in step 4) according to the weight ratio, mixing evenly, and after granulating, pressing the granular powder into a blank on a press;

[0070] 6) Atmosphere sintering: the blank obtained in step 5) is sintered in an atmosphere sintering furnace at a temperature of 1000° C. for 2 hours in an oxygen atmosphere.

[0071] The L...

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Abstract

The invention discloses a LiZn ferrite material for a phase shifter, and belongs to the technical field of electronic materials. The LiZn ferrite material consists of main materials, additives and an adhesive, and is characterized in that: based on Fe2O3, ZnO, Mn3O4 and Li2CO3, the main materials are calculated according to a molecular formula of Li0.35+xZn0.3Fe2.28Mn0.0704+delta, wherein x=0.01-0.2 and x=2 delta; and relative to the main materials, the additives comprise the following components: 0.5 to 2.0 weight percent of Bi2O3, 0.1 to 0.4 weight percent of NiO and 0.2 to 0.5 weight percent of V2O5. The LiZn ferrite material has excellent characteristics of low coercivity, low dielectric loss, low ferromagnetic resonance line width, high saturation magnetization and the like.

Description

technical field [0001] The invention belongs to the technical field of electronic materials, and in particular relates to a LiZn ferrite material for a Ka-band phase shifter and a preparation method thereof. Background technique [0002] The demand for satellite communication and radar technology has promoted the development of microwave technology and the research of microwave gyromagnetic materials and devices. Therefore, the development and design of new materials and new devices has become one of the topics that people pay close attention to. LiZn ferrite is widely used in microwave latching due to its characteristics of wide adjustable range of saturation magnetization at room temperature, high Curie temperature, high squareness ratio, low sensitivity of residual magnetism to stress, good temperature stability and low cost. Phase shifters and high-power devices (see literature 1, M Pardavi-Horvath. Microwave applications of ferrites [J]. J MagnMagn Mater, 2000, 215 (6):...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 蒋晓娜孙科余忠兰中文王智锟罗明郭荣迪
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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