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A kind of low coercive force liznti gyromagnetic ferrite material and preparation method thereof

A technology of gyromagnetic ferrite and low coercivity is applied in the field of low-temperature sintering of LiZnTi gyromagnetic ferrite material with low coercivity and its preparation, which can solve the problem of composition segregation, impure crystal phase, and influence on LiZnTi ferrite. Grain growth, magnetic domain inversion microwave modulation, etc., to achieve the effect of reducing coercivity, reducing reaction energy, promoting nucleation and grain growth

Inactive Publication Date: 2016-08-17
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the research on the low-temperature sintering method of ferrite is mainly reflected in the improvement of the preparation process and the doping of the ferrite material. The improvement of these two aspects needs to be considered at the same time, otherwise it will affect the grain growth of LiZnTi ferrite. , magnetic domain inversion, microwave modulation and other properties, there are problems such as composition segregation and crystal phase impurity

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  • A kind of low coercive force liznti gyromagnetic ferrite material and preparation method thereof

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Effect test

Embodiment 1

[0020] A preparation method of low coercive force LiZnTi gyromagnetic ferrite material, comprising the following steps:

[0021] Step 1: Fe 2 o 3 , ZnO, TiO 2 , Li 2 CO 3 as raw material, according to Li 0.42 Zn 0.28 Ti 0.13 Fe 2.17 o 4 The ratio of the molecular formula is weighed, and the main powder is prepared;

[0022] Step 2: Perform a ball mill according to the mass ratio of main powder: water: iron ball = 1:1.2:3. The ball milling time is 4 hours. After taking it out, dry it at 100°C. Put the powder obtained after drying into sintering In the furnace, the temperature was raised from room temperature to 800 °C at a heating rate of 2 °C / min and kept for 3 hours, and then naturally cooled to room temperature with the furnace to obtain the main LiZnTi material;

[0023] Step 3: with ZnO, Bi 2 o 3 , SiO 2 , Li 2 CO 3 As the raw material, the raw material is according to the mass ratio ZnO: Bi 2 o 3 : SiO 2 ,: Li 2 CO 3 = 5:3:1:1 ratio of ingredients, wet...

Embodiment 2

[0027] A preparation method of low coercive force LiZnTi gyromagnetic ferrite material, comprising the following steps:

[0028] Step 1: Fe 2 o 3 , ZnO, TiO 2 , Li 2 CO3 as raw material, according to Li 0.42 Zn 0.28 Ti 0.13 Fe 2.17 o 4 The ratio of the molecular formula is weighed, and the main powder is prepared;

[0029] Step 2: Perform a ball mill according to the mass ratio of main powder: water: iron ball = 1:1.3:3. The ball milling time is 6 hours. After taking it out, dry it at 100°C. Put the powder obtained after drying into sintering In the furnace, the temperature was raised from room temperature to 820 °C at a heating rate of 2 °C / min and kept for 1 hour, and then the temperature was naturally lowered to room temperature with the furnace to obtain the main LiZnTi material;

[0030] Step 3: with ZnO, Bi 2 o 3 , SiO 2 , Li 2 CO 3 As the raw material, the raw material is according to the mass ratio ZnO: Bi 2 o 3 : SiO 2 ,: Li 2 CO 3 = 5:3:1:1 ratio o...

Embodiment 3

[0034] A preparation method of low coercive force LiZnTi gyromagnetic ferrite material, comprising the following steps:

[0035] Step 1: Fe 2 o 3 , ZnO, TiO 2 , Li 2 CO 3 as raw material, according to Li 0.42 Zn 0.28 Ti 0.13 Fe 2.17 o 4 The ratio of the molecular formula is weighed, and the main powder is prepared;

[0036] Step 2: Perform a ball mill according to the mass ratio of main powder: water: iron ball = 1:1.4:3. The ball milling time is 8 hours. After taking it out, dry it at 100°C. Put the powder obtained after drying into sintering In the furnace, the temperature was raised from room temperature to 820 °C at a heating rate of 2 °C / min and kept for 1 hour, and then the temperature was naturally lowered to room temperature with the furnace to obtain the main LiZnTi material;

[0037] Step 3: with ZnO, Bi 2 o 3 , SiO 2 , Li 2 CO 3 As the raw material, the raw material is according to the mass ratio ZnO: Bi 2 o 3 : SiO 2 ,: Li 2 CO 3 = 5:3:1:1 ratio...

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Abstract

The invention provides a low-coercivity LiZnTi gyromagnetic ferrite material and a preparation method thereof, belonging to the technical field of magnetic materials. The low coercive force LiZnTi gyromagnetic ferrite material is composed of main material, glass phase sintering aid and flux, wherein the weight percentage of main material is 99.5% to 99.8%, and the weight percentage of glass phase sintering aid is 0.1% to 0.4% %, the flux weight percentage is 0.1%, and the main material is Li0.42Zn0.28Ti0.13Fe2.17O4, and the glass phase sintering aid is made of raw materials according to the mass ratio ZnO: Bi2O3: SiO2: Li2CO3=5:3:1: 1 preparation, the flux is Al2O3 nano powder with particle size less than 100nm. The invention realizes sintering and preparation of LiZnTi ferrite at low temperature (900-940 DEG C), and obtains ferrite material with low coercive force.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials, in particular to a LiZnTi gyromagnetic ferrite material with low coercivity 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. LiZnTi gyromagnetic ferrite is a kind of Li-based ferrite material, which has the advantages of low coercivity, high saturation magnetization, high residual magnetic induction, etc., and has been widely valued in the preparation of microwave devices. [0003] The LiZnTi ferrite material prepared by traditional high-temperature sintering (~1200°C) met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/622C04B35/63C04B35/64
Inventor 廖宇龙张怀武周廷川王晓艺贾利军杨青慧
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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