Hexagonal ferrite material with high anisotropy and low ferromagnetic resonance line width and preparation method

A ferromagnetic resonance line and hexagonal ferrite technology, which is applied in the field of ferrite material preparation, can solve the problems of unpublished ferromagnetic resonance line width and anisotropy parameters, and achieve the effect of increasing the working frequency band and reducing the insertion loss

Active Publication Date: 2018-08-21
四川诺威胜电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

None of the published patents disclose the ferromagnetic r...

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  • Hexagonal ferrite material with high anisotropy and low ferromagnetic resonance line width and preparation method
  • Hexagonal ferrite material with high anisotropy and low ferromagnetic resonance line width and preparation method
  • Hexagonal ferrite material with high anisotropy and low ferromagnetic resonance line width and preparation method

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preparation example Construction

[0048] The main component of the hexagonal ferrite material with high anisotropy and low ferromagnetic resonance line width of the present invention is calculated as an oxide by mole percentage, and the dopant component is calculated by weight percentage as an oxide. M type hexagonal ferrite material of the present invention and preparation method thereof, comprises the following steps:

[0049] 1. Main ingredient formula

[0050] Using 67.0~75.0mol% Fe 2 o 3 , 0.5~7.5mol%SrCO 3 , 0.5~7.5mol% BaCO 3 , 3.5~6.5mol%Co 2 o 3 , 3.5~11.5mol%La 2 o 3 , 8.5~13.5mol% CuO;

[0051] 2. One ball milling

[0052] Mix the above powders evenly in a ball mill for 20-26 hours;

[0053] 3. Pre-burning

[0054] Dry the ball mill material obtained in step 2, and pre-fire it in a furnace at 1000-1150°C for 3-6 hours;

[0055] 4. Doping

[0056] Add the following dopant to the powder obtained in step 3 by weight ratio: 0.5-2.0wt% Bi 2 o 3 , 0.15~1.0wt%B 2 o 3 , 0.02~0.32wt% CaCO 3...

Embodiment 1～4

[0070] Embodiments 1-4: A method for preparing a hexagonal ferrite material with high anisotropy and low ferromagnetic resonance linewidth, comprising the following steps:

[0071] Embodiment 1~4:

[0072] 1. Formula

[0073] Embodiment 1~4 master formula sees the following table:

[0074]

[0075] 2. One ball milling

[0076] Mix the above-mentioned powders evenly in a ball mill for 25 hours;

[0077] 3. Pre-burning

[0078] Dry the ball mill material obtained in step 2, and pre-fire it in a furnace at 1020°C for 5.5 hours;

[0079] 4. Doping

[0080] Add the following dopant by weight ratio to the powder obtained in step 3: 1.25wt% Bi 2 o 3 , 0.75wt% B 2 o 3 , 0.08wt% CaCO 3 , 0.04wt% SiO 2 , embodiment 1~4 adds ISOBAM (isobutylene-maleic anhydride copolymer) according to the table;

[0081]

[0082] 5. Secondary ball milling

[0083] Mill the ingredient powder in step 4 in a ball mill for 10 hours, and the particle size of the powder is controlled between...

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Abstract

The invention discloses a hexagonal ferrite material with high anisotropy and low ferromagnetic resonance line width and a preparation method and belongs to the technical field of preparation of ferrite materials. The material is prepared from a main component and a dopant and is characterized in that the main component comprises 67.0mol%-75.0mol% of Fe2O3, 0.5mol%-7.5mol% of SrCO3, 0.5mol%-7.5mol% of BaCO3, 3.5mol%-6.5mol% of Co2O3, 3.5mol%-11.5mol% of La2O3 and 8.5mol%-13.5mol% of CuO; the dopant comprises, in percentage by weight of the main component in terms of oxide, 0.5wt%-2.0wt% of Bi2O3, 0.15wt%-1.0wt% of B2O3, 0.02wt%-0.32wt% of CaCO3, 0.02wt%-0.32wt% of SiO2 and 0.05wt%-0.50wt% of ISOBAM. The ferrite material has the characteristics of high density d larger than 5.20 g/cm<3>, high remanence 4 phi Mr larger than 4.3 kGs, high anisotropic field Ha larger than 15.0 kOe and low ferromagnetic resonance line width delta H smaller than 3,700 e (@44 GHz and Zero field).

Description

technical field [0001] The invention belongs to the technical field of ferrite material preparation. Background technique [0002] Since the beginning of the 21st century, with the rapid development of space radar technology, higher and higher requirements have been put forward for the microwave / millimeter wave ferrite devices used in it, such as high frequency, miniaturization, low loss and high stability Wait. Spinel-type and garnet-type ferrite devices usually require a constant external magnetic field to work, and the external magnetic field will increase as the operating frequency of the device increases, which contradicts the current development direction of microwave / millimeter wave devices. The magnetoplumbite type hexagonal ferrite, as a permanent magnet material, has high saturation magnetization, high Curie temperature, and high anisotropy, and can use the self-built "inner field" to replace the external stable The magnetic field realizes the self-biasing charac...

Claims

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Application Information

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IPC IPC(8): C04B35/40
CPCC04B35/2633C04B35/2641C04B2235/3227C04B2235/3275C04B2235/3281C04B2235/3298C04B2235/3409C04B2235/3418C04B2235/442C04B2235/77C04B2235/96
Inventor 余忠邬传健孙科郭荣迪蒋晓娜
Owner 四川诺威胜电子科技有限公司
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