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Large-grain-size LiZnTi ferrite and preparation method thereof

A ferrite and large-grain technology, applied in the field of functional ceramics, can solve problems such as deterioration of magnetic properties, high sintering temperature, and difficulty in miniaturization of microwave devices, and achieve low coercive force, high saturation magnetic induction, and high The effect of magnetic permeability

Inactive Publication Date: 2021-08-31
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing technology for preparing high-performance LiZnTi ferrite requires a very high sintering temperature (>1100°C). On the other hand, the melting point of the silver electrode used in the LTCC process is only 961°C. Therefore, LiZnTi prepared by the existing high-temperature sintering technology Ferrite cannot meet the requirements of LTCC technology, making it difficult to miniaturize microwave devices
In order to meet the technical requirements of LTCC, when the sintering temperature of ferrite decreases from above 1100°C to 900°C, the growth of ferrite grains is obviously inhibited, and the magnetic properties are seriously deteriorated.

Method used

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  • Large-grain-size LiZnTi ferrite and preparation method thereof
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  • Large-grain-size LiZnTi ferrite and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0034] A preparation method of a LiZnTi ferrite material with a large grain size, comprising the following steps:

[0035] 75.3wt% Fe by mass percentage 2 o 3 , 6.5wt% Li 2 CO 3 , 10.3wt% ZnO, 4.9wt% TiO 2 , 3.0wt% nano-CuO was weighed and mixed, and the main powder was configured, and the main powder was wet ball milled for 6 hours, and the period was fully mixed evenly to obtain a mixture after ball milling;

[0036] Put the primary ball mill mixture obtained above into an oven for drying at a temperature of 100°C, then put it into a sintering furnace for pre-sintering treatment, the pre-sintering temperature is 800°C, the holding time is 2.5 hours, and then cool naturally with the furnace;

[0037] The powder obtained by pre-calcination is mixed with 0.5wt% LBSCA glass additive by ball milling for a second time, the ball milling time is 8 hours, and the mixture is obtained after drying;

[0038] After the above-mentioned ball mill is dried, add an appropriate amount of p...

Embodiment 2

[0042] A preparation method of a LiZnTi ferrite material with a large grain size, comprising the following steps:

[0043] By mass percentage will 74.3wt% Fe 2 o 3 , 6.1wt% Li 2 CO 3 , 10.3wt% ZnO, 4.9wt% TiO 2 , 4.4wt% nano-CuO is weighed and mixed, the main powder is configured, and the main powder is wet ball milled for 6 hours, fully mixed evenly during the period, and the mixture after ball milling is obtained once;

[0044] Put the primary ball mill mixture obtained above into an oven for drying at a temperature of 100°C, then put it into a sintering furnace for pre-sintering treatment, the pre-sintering temperature is 800°C, the holding time is 2.5 hours, and then cool naturally with the furnace;

[0045] The powder obtained by pre-calcination is mixed with 0.5wt% LBSCA glass additive by ball milling for a second time, the ball milling time is 8 hours, and the mixture is obtained after drying;

[0046] After the above-mentioned ball mill is dried, add an appropriat...

Embodiment 3

[0050] A preparation method of a LiZnTi ferrite material with a large grain size, comprising the following steps:

[0051] By mass percentage will 73.3wt% Fe 2 o 3 , 5.7wt% Li 2 CO 3 , 10.3wt% ZnO, 4.9wt% TiO 2 , 5.9wt% nano-CuO was weighed and mixed, and the main powder was configured, and the main powder was wet ball milled for 6 hours, and the period was fully mixed evenly to obtain a mixture after ball milling;

[0052] Put the primary ball mill mixture obtained above into an oven for drying at a temperature of 100°C, then put it into a sintering furnace for pre-sintering treatment, the pre-sintering temperature is 800°C, the holding time is 2.5 hours, and then cool naturally with the furnace;

[0053] The powder obtained by pre-calcination is mixed with 0.5wt% LBSCA glass additive by ball milling for a second time, the ball milling time is 8 hours, and the mixture is obtained after drying;

[0054] After the above-mentioned ball mill is dried, add an appropriate amou...

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Abstract

The invention discloses LiZnTi ferrite with a large grain size and a preparation method thereof. The LiZnTi ferrite comprises the following raw material components in percentage by mass: 99.25 to 99.75 wt% of a main component and 0.25 to 0.75 wt% of an additive. The main component comprises the following components in percentage by mass: 72.3 to 75.3 wt% of Fe2O3, 5.3 to 6.5 wt% of Li2CO3, 10.2 to 10.4 wt% of ZnO, 4.7 to 4.9 wt% of TiO2 and 3.0 to 7.4 wt% of nano-CuO. The component of the additive is LBSCA glass. The preparation method has the beneficial effects that proper nano-CuO particles and the low-melting-point glass additive are added in the presintering stage of the LiZnTi ferrite, so the sintering temperature is effectively reduced to 900 DEG C; and meanwhile, the ferrite can keep good magnetic performance of the LiZnTi ferrite like a large-grain microstructure obtained by high-temperature sintering.

Description

technical field [0001] The invention relates to a LiZnTi ferrite and a preparation method thereof, in particular to a LiZnTi ferrite with a large grain size and a preparation method thereof, and belongs to the technical field of functional ceramic applications. Background technique [0002] With the development and application of radar technology, mobile communication technology, especially 5G technology, higher requirements are put forward for the miniaturization, chip and high frequency of electronic products. Microwave modules based on low-temperature co-fired ceramics (LTCC) technology have the characteristics of high integration, high operating frequency, and the ability to mix and integrate with active devices, which can well meet this development demand. LiZnTi microwave ferrite has the characteristics of low coercive force, high saturation magnetization and low ferromagnetic resonance linewidth, and has important applications in microwave and even millimeter wave dev...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622C04B35/64C03C3/064
CPCC03C3/064C04B35/2616C04B35/622C04B35/64C04B2235/3232C04B2235/36C04B2235/6565C04B2235/6567C04B2235/96
Inventor 许方杨泓玮刘永刚韩亚东胡建波
Owner SOUTHWEAT UNIV OF SCI & TECH