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Process for microwave sintering gyromagnet ferrite material

A gyromagnetic ferrite and microwave sintering technology, which is applied in the field of magnetic material manufacturing equipment, can solve problems such as difficult high-temperature sintering in an oxygen-enriched atmosphere, abnormal growth of material grains, and long sintering cycle, etc. The production efficiency and economic benefits are considerable, and the production cycle is short

Inactive Publication Date: 2006-06-28
长沙隆泰科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the sintering method of gyromagnetic materials at home and abroad is mainly the conventional heating sintering method. Due to the influence of heating equipment, it is difficult to achieve sintering in a high-temperature oxygen-enriched atmosphere, and the sintering cycle is long, and the internal grains of the material tend to grow abnormally.

Method used

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  • Process for microwave sintering gyromagnet ferrite material
  • Process for microwave sintering gyromagnet ferrite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0006] Embodiment 1, take formula as {Y 3-x Gd x}[Fe 1.8 In 0.2 ](Fe 3-z al z )O 12 500g of the garnet-type gyromagnetic ferrite material is placed in a bell-type microwave oven. The microwave frequency is 2.45GHz, and the furnace is filled with 95% oxygen atmosphere. The heating rate of the material sintering is 8°C per minute, the holding temperature is 1500°C, holding the heat for 40 minutes, and then cooling with the furnace. The entire sintering cycle does not exceed 7 hours, and the energy consumption does not exceed 15kW.h. The test results show that the average grain size of the material is lower than 4 μm, and other performance parameters are shown in Table 1.

[0007] Table 1 Dielectric loss characteristic table

[0008]

Embodiment 2

[0009] Embodiment 2, get formula and be LiFe 1 / 2(1-x+y) Mg x TiAl z Fe (2-2y-z) o 4 800g of the gyromagnetic ferrite material is placed in a bell-type microwave oven, the microwave frequency is 2.45GHz, the oxygen atmosphere is 99.5%, the heating rate is 10°C / min, the temperature is 950°C, and the temperature is kept for 40 minutes. The cooling is controlled and the cooling rate is 5°C. / min, sintering cycle ≤ 6 hours, energy consumption ≤ 11kW.h. The test results show that the average grain size of the material is less than 3 μm, and other performance parameters are shown in Table 2.

[0010] Table 2 Dielectric loss characteristic table

[0011]

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Abstract

The invention relates to a method of microwave sintering rotating magnetic ferrites material. It includes the following steps: putting the rotating magnetic ferrites blank into microwave furnace to take sintering by microwave energy, under the condition of 300MHz-300GHz microwave frequency, plenty oxygen, temperature rising to 2000 degree centigrade from room temperature keeping for 0-200 minutes, and cooling. The invention has simple technology, short producing cycle. It has great economic benefits.

Description

technical field [0001] The invention relates to a manufacturing device and method of magnetic materials, in particular to a device and a sintering method for sintering gyromagnetic ferrite materials using microwave energy. Background technique [0002] Spun ferrite is also called microwave ferrite. Microwave ferrite devices are an indispensable part of electronic equipment such as modern communication, radar, electronic countermeasures and measuring instruments, and play an irreplaceable role for other components. Gyromagnetic ferrite materials mainly include garnet type, spinel type and hexagonal (magnetite type) polycrystalline and single crystal ferrite materials. The main requirements for materials of microwave ferrite devices are: small ferromagnetic resonance line width ΔH, required saturation magnetization Ms, microwave dielectric loss tgδ e Small, high Curie temperature, low temperature coefficient of Ms, high power critical field hc, that is, high spin linewidth ΔH...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/64C04B35/26
Inventor 彭虎李俊
Owner 长沙隆泰科技有限公司
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