Low-loss LiZnTiMn gyromagnetic ferrite material and preparation method thereof

A technology of gyromagnetic ferrite and low loss, which is applied in the field of low-loss sintered LiZnTiMn gyromagnetic ferrite material and its preparation, which can solve the problem of deteriorating phased array radar system performance and increasing loss of ferrite phase shifter , Increased microwave loss characteristics, etc., to achieve the effect of promoting nucleation and uniform growth, promoting nucleation and grain growth, and improving uniformity

Pending Publication Date: 2021-12-28
UNIV OF ELECTRONICS SCI & TECH OF CHINA +1
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Problems solved by technology

[0003] As one of the excellent gyromagnetic materials for making ferrite phase shifters, when LiZnTiMn ferrite is applied to LTCF (low temperature co-fired ferrite) technology and silver electrode to achieve low temperature co-firing (~960°C), the grain size is relatively small. Small, high porosity, resulting in a sharp increase in microwave loss characteristics (ferromagnetic resonance linewidth and dielectric loss), resulting in greater loss of the ferrite phase shifter, deteriorating the performance of the phased array radar system

Method used

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  • Low-loss LiZnTiMn gyromagnetic ferrite material and preparation method thereof

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Embodiment 1

[0019] A preparation method of low-loss LiZnTiMn gyromagnetic ferrite material, comprising the following steps:

[0020] Step 1, with Fe 2 o 3 , ZnO, TiO 2 , Li 2 CO 3 , Mn 3 o 4 as raw material, according to Li 0.42 Zn 0.27 Ti 0.11 mn 0.1 Fe 2.1 o 4 The ratio of the molecular formula is to weigh the raw materials and mix them to obtain the main powder;

[0021] Step 2. Perform a ball mill according to the mass ratio of main powder: water: iron ball = 1:1.5:3. The ball milling time is 6 hours. After the ball milling is completed, take it out and dry it at 100°C. Put the material into the sintering furnace, raise the temperature from room temperature to 800 °C at a heating rate of 2 °C / min and keep it for 2 hours, and then naturally cool down to room temperature with the furnace to obtain the LiZnTiMn main material;

[0022] Step 3. Put Bi 2 o 3 with Nb 2 o 5 The composite sintering aid of composition is added in the main material that step 2 obtains, and where...

Embodiment 2

[0026] Embodiment 2 is compared with embodiment 1, and difference is: the process of step 4 is: add polyvinyl alcohol (PVA) granulation molding and be pressed into blank in the secondary ball abrasive that step 3 obtains, molding pressure is 10Mpa, Then put the blank into the sintering furnace, first raise the heating rate to 450°C at a rate of 2°C / min, keep it for 2 hours, then raise the rate of heating to 920°C at a rate of 2°C / min and sinter for 2 hours. The cooling rate of °C / min is lowered to 600 °C, and then the temperature is naturally lowered to room temperature with the furnace to obtain the low-loss LiZnTiMn gyromagnetic ferrite material.

[0027] The properties of the LiZnTiMn gyromagnetic ferrite material prepared in Example 2 are: sample density: 4.70g / cm 3 ; Saturation magnetic induction: 328mT; Ferromagnetic resonance line width: 161Oe; Coercive force: 152A / m; Squareness ratio: 0.87.

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Abstract

The invention provides a low-loss LiZnTiMn gyromagnetic ferrite material and a preparation method thereof, and belongs to the technical field of magnetic materials. The gyromagnetic ferrite material comprises a main material and a composite sintering aid, the weight percentage of the main material is 99.0%-99.5%, and the weight percentage of the composite sintering aid is 0.5%-1.0%; the main material is Li < 0.42 > Zn < 0.27 > Ti < 0.11 > Mn < 0.1 > Fe < 2.1 > O < 4 >, the composite sintering aid is composed of Bi2O3 and Nb2O5, and the mass ratio of Bi2O3 to Nb2O5 is 5: (1-5). The low-temperature sintering of LiZnTiMn is realized by optimizing the sintering process and adding the composite sintering aid, the LiZnTiMn ferrite material with low loss is obtained, the coercive force of the material is reduced, and the performance of the material is optimized.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials, and in particular relates to a low-loss LiZnTiMn gyromagnetic ferrite material sintered at low temperature and a preparation method thereof. Background technique [0002] With the development of radar technology and the needs of application fields, microwave / millimeter wave devices such as phase shifters for phased array radar are developing in the direction of high power, high precision and high frequency. Li-based ferrite materials with high saturation magnetization can be well applied to ferrite microwave devices in the Ka band and above. LiZnTiMn gyromagnetic ferrite is a kind of Li-based ferrite material, which has the advantages of low coercive force, high saturation magnetization, high remanence ratio, etc., and has been widely used in the preparation of microwave devices. [0003] As one of the excellent gyromagnetic materials for making ferrite phase shifters, when LiZnTiMn f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/64H01F1/01
CPCC04B35/2616C04B35/64H01F1/01C04B2235/3263C04B2235/3272C04B2235/3284C04B2235/3232C04B2235/6562C04B2235/6567C04B2235/3298C04B2235/3251
Inventor 廖宇龙尹凯军李金彦李元勋张怀武陈文豪
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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