Low-loss LiZn ferrite material for phase shifter and preparation method thereof

A ferrite material, low loss technology, applied in the preparation of high saturation magnetization LiZn ferrite material, the field of ferrite material preparation, can solve the problem of not given parameters, to reduce dielectric loss, low distortion Coercive force, the effect of improving the resistivity of the material

Inactive Publication Date: 2009-10-07
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0003] The saturation magnetization of XL45A LiZn ferrite published by the Southwest Institute of Technology in 2000 is 4πM s =450±5%mT, ferromagnetic resonance linewidth ΔH=25.4±25%kA·m -1 , dielectric loss tanδ ε′ -4 , dielectric constant τ=15, Curie temperature T c >500℃, density ρ app =4.75g·m -3 , but the coercive force H of the material is not given c and remanence B r parameter

Method used

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  • Low-loss LiZn ferrite material for phase shifter and preparation method thereof
  • Low-loss LiZn ferrite material for phase shifter and preparation method thereof

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preparation example Construction

[0035] As an embodiment of the preparation method, the phase shifter of the present invention uses a low-loss high saturation magnetization LiZn ferrite material preparation method comprising the following steps:

[0036] (1) Formula

[0037] Using 64~71mol% Fe 2 o 3 , 15-22mol% ZnO, 0.8-1.5mol% Mn 3 o 4 , 9.9~12mol% Li 2 CO 3 ;

[0038] (2) Ball milling once

[0039] Grind the above powder in a planetary ball mill with a steel ball for 1 to 3 hours to mix the powder evenly;

[0040] (3) pre-burning

[0041] Pre-burn the ball abrasive obtained in step 2 in a furnace at 760-850°C for 1-3 hours;

[0042] (4) Doping

[0043] Add the following additives to the powder obtained in step 3 by weight: 0.5-3.0wt% Bi 2 o 3 , 0.1~0.5wt% BST, 0.05~0.4wt% Nb 2 o 5 ;

[0044] (5) Secondary ball milling

[0045] The powder obtained in step 4 is milled with steel balls for 2 to 6 hours in a planetary ball mill;

[0046] (6) Molding

[0047] Add 8-15wt% organic binder to the p...

Embodiment 5

[0108] 1. Formula

[0109] Using 68.5mol% Fe 2 o 3 , 19.1mol% ZnO, 11.1mol% Li 2 CO 3 , 1.3 mol% Mn 3 o 4 ;

[0110] 2. One ball milling

[0111] Grind the above powder in a planetary ball mill with a steel ball for 1.5 hours to mix the powder evenly;

[0112] 3. Pre-burning

[0113] Pre-fire the ball abrasive obtained in step 2 in a furnace at 800°C for 1.5 hours;

[0114] 4. Doping

[0115] Add the following additives to the powder obtained in step 3 by weight: 3.0wt% Bi 2 o 3 , 0.2wt% BST, 0.1wt% Nb 2 o 5 ;

[0116] 5. Secondary ball milling

[0117] The powder obtained in step 4 was milled with steel balls for 2 hours in a planetary ball mill;

[0118] 6. Forming

[0119] Add 15wt% organic binder to the powder obtained in step 5 by weight, mix evenly, and after granulation, press the granular powder into a blank on a press;

[0120] 7. Atmosphere sintering

[0121] The blank obtained in step 6 was sintered in an atmosphere sintering furnace at a temperat...

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Abstract

A low-loss LiZn ferrite material for a phase shifter relates to the technical field of preparation of ferrite materials. The low-loss LiZn ferrite material consists of main materials, additives and binding agents, calculated by Fe2O3, ZnO, Mn3O4 and Li2CO3, the main materials comprise 64-71 mol percent of Fe2O3, 15-22 mol percent of ZnO, 0.8-1.5 mol percent of Mn3O4 and 9.9-12 mol percent of Li2CO3; relative to the main materials, the additives are calculated by Bi2O3, BST and Nb2O5, and the proportion is 0.5-3.0 wt percent of Bi2O3, 0.1-0.5 wt percent of BST and 0.05-0.4 wt percent of Nb2O5. The invention reduces the coercivity and the dielectric loss, and improves the saturation magnetization, thus realizing the low temperature preparation of the LiZn ferrite material with low coercivity, low dielectric loss and high saturation magnetization.

Description

technical field [0001] The technology relates to the technical field of preparation of ferrite materials, in particular to the technical field of preparation of LiZn ferrite materials with low coercive force, low dielectric loss and high saturation magnetization. Background technique [0002] 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. Compared with semiconductor phase shifters, ferrite phase shifters can withstand higher peak power from S-band to Ku-band. In order to improve the amplitude-phase balance consistency of the phase shifter and reduce the driving current of the phase shifter, the LiZn ferrite used in it must have a low coercive force (H c ), low loss (tanδ ε′ ) and good temperature ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/34H01F1/37C04B35/26C04B35/64
Inventor 蒋晓娜兰中文余忠孙科姬海宁刘培元庄亚明
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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