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High-Q-value lithium titanate-based microwave dielectric ceramic material and preparation method thereof

A technology of microwave dielectric ceramics and lithium titanate, which is applied in the field of ceramic materials, can solve problems such as not meeting production requirements, and achieve the effects of improving sintering characteristics, simple preparation process and wide application prospects.

Inactive Publication Date: 2021-08-27
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a high-Q value lithium titanate-based microwave dielectric ceramic material and a preparation method thereof, which solves the pure term Li 2 TiO 3 The Qf value does not meet the technical problem of production demand, through the Li 2 TiO 3 Add different kinds of dopants to improve the crystal phase of ceramics, promote the densification and sintering of ceramics, thereby improving the Li 2 TiO 3 Sintering characteristics to improve the quality factor of lithium titanate

Method used

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  • High-Q-value lithium titanate-based microwave dielectric ceramic material and preparation method thereof
  • High-Q-value lithium titanate-based microwave dielectric ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Will li 2 CO 3 TiO 2 Mass moon ratio is Li 2 CO 3 TiO 2 = 1: 1 For ingredients, put the powder into the polyester ball grinding tank, the mass ratio of the raw material and deionized water and zirconia balls is 1:30:15, and the ball mill is 400 in the planetary ball mill. / Twist;

[0031] (2) Put the raw material after ball milling of step (1) into a drying tank, drying at 120 ° C for 4 hours, and then 40 mesh sieve;

[0032] (3) Put the powder after the step (2) is placed in a medium temperature furnace, pre-fever at 900 ° C, heat insulation for 4 hours, synthesis Li 2 TIO 3 , Then cross 40 sieves;

[0033] (4) Sex (3) The amount of mass percentage of the powder is 8% as the binder, which is 80 mesh sieve;

[0034] (5) Powder the powder pressurizing machine of step (4) is pressed under 2 MPa pressure;

[0035] (6) Sintering the green body of step (5) at 1140 ° C, 8 hours, resulting in a lithium titanate microwave medium ceramic material of the present embodiment;

[0...

Embodiment 2

[0038] (1) Will li 2 CO 3 TiO 2 Mass moon ratio is Li 2 CO 3 TiO 2 = 1: 1 For ingredients, put the powder into the polyester ball grinding tank, the mass ratio of the raw material and deionized water and zirconia balls is 1:30:15, and the ball mill is 400 in the planetary ball mill. / Twist;

[0039] (2) Put the raw material after ball milling of step (1) into a drying tank, drying at 120 ° C for 4 hours, and then 40 mesh sieve;

[0040] (3) Put the powder after the step (2) is placed in a medium temperature furnace, pre-fever at 850 ° C, heat insulation for 4 hours, synthesis Li 2 TIO 3 , Then cross 40 sieves;

[0041] (4) MGF with a mass percentage content of 1% by weight of the powder after sieving step (3) 2 Mixing, the mixed powder is placed in a polyester ball grinding tank, and the mass ratio of the feedstock and deionized water and zirconia balls is 1:30:15, and the ball mill is 400 / 400 / Split;

[0042] (5) Put the raw material after ball milling of step (4) into the dryi...

Embodiment 3

[0048] According to the method of Example 2, a titanate-based microwave medium ceramic material was prepared and the microwave dielectric properties of the resulting article were tested, wherein the pre-stench time in step (3) was 950 ° C, which was 8 hours; step (4) added MGF with a mass percentage of 1.5 wt% 2 The sintering temperature in step (8) was 1120 ° C, and the remaining process conditions were the same as in Example 2.

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Abstract

The invention belongs to the technical field of ceramic materials, and discloses a high-Q-value lithium titanate-based microwave dielectric ceramic material and a preparation method thereof. The preparation method comprises the following steps: subjecting Li2CO3 and TiO2 to burdening, ball milling, drying and sieving according to a stoichiometric formula Li2TiO3 and then performing presintering at a temperature of 800-1000 DEG C; adding an M doping agent, carrying out ball milling, drying, sieving and granulating successively, and conducting pressing to obtain a green body; and sintering the green body at a temperature of 1100-1180 DEG C. The chemical formula of the obtained high-Q-value lithium titanate-based microwave dielectric ceramic material is Li<2>TiO<3+x>M, wherein M is Li2CO3, MgO, LiF, MgF2 or MgO + LiF, and x is equal to 0.6 wt.%-3.6 wt.%. According to the invention, different types of dopants are introduced into Li2TiO3, so the sintering characteristic of microwave dielectric ceramic is improved, and the defect that the Qf value of pure Li2TiO3is low is overcome; the produced material has a high quality factor and a moderate dielectric constant; a preparation process is simple; and microwave dielectric devices manufactured, researched and developed on the basis of the material have wide application prospects.

Description

Technical field [0001] The present invention belongs to the technical field of ceramic material, and in particular, it is to relate to a lithium titanate microwave medium ceramic material and a preparation method thereof. [0002] technical background [0003] Modern electronic technology and communication technology rapidly development, electronic components are moving towards miniaturization, high frequency, systematic, and integrated direction. With the widespread use of 5G technology, especially the introduction of large-scale antenna technology, there will be a larger energy loss problem on long-range data transmission, and some emerging technologies surrounded by 5G technology, such as automatic driving, virtual simulation simulation. , Industrial Internet, wireless medical, etc., the same is highly required for energy transmission efficiency. Therefore, how to reduce energy transmission loss will become the primary issue of 5G technology development. [0004] Microwave medi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/622C04B35/63
CPCC04B35/462C04B35/622C04B35/6303C04B2235/3203C04B2235/3232C04B2235/445C04B2235/3206C04B2235/5427C04B2235/602C04B2235/656C04B2235/6567
Inventor 李玲霞战宇杜明昆倪立争
Owner TIANJIN UNIV
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