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An ultra-low loss lithium-magnesium-titanium-based microwave dielectric ceramic and its preparation method

A technology for microwave dielectric ceramics and microwave dielectric materials is applied in the field of lithium-magnesium-titanium-based microwave dielectric ceramic materials and their preparation. The effect of low manufacturing cost and simple preparation process

Active Publication Date: 2021-03-09
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these studies are not very effective in improving the quality factor, and some even significantly reduce the quality factor

Method used

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  • An ultra-low loss lithium-magnesium-titanium-based microwave dielectric ceramic and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] composed as figure 1 Shown in 1, the specific preparation method comprises the following steps:

[0026] (1) Calculate the weight percentage of raw materials according to the molar percentage (mol%) of the selected target phase, and then weigh the raw materials;

[0027] (2) Put the weighed powder in a ball mill jar, add zirconia balls and absolute ethanol, and mill for 8 hours (300 rpm);

[0028] (3) After the powder is dried, pass through a 40-mesh standard sieve, pre-fire at 1050°C in the atmosphere for 4 hours, the heating rate is 5°C / min, and then cool down with the furnace;

[0029] (4) Put the pre-fired powder in a ball mill tank, add zirconia balls and absolute ethanol, and mill for 8 hours (300 rpm);

[0030] (5) adding a paraffin wax binder in a proportion of 8wt% for granulation, passing through an 80-mesh standard sieve;

[0031] (6) Use a tablet press to press the granulated powder into a cylinder of Φ10mm×5mm, and the pressure is about 6MPa;

[0032] ...

Embodiment 2

[0036] composed as figure 1 Shown in 2, the specific preparation method comprises the following steps:

[0037] (1) Calculate the weight percentage of raw materials according to the molar percentage (mol%) of the selected target phase, and then weigh the raw materials;

[0038] (2) Put the weighed powder in a ball mill jar, add zirconia balls and absolute ethanol, and mill for 8 hours (300 rpm);

[0039] (3) After the powder is dried, pass through a 40-mesh standard sieve, pre-fire at 1050°C in the atmosphere for 4 hours, the heating rate is 5°C / min, and then cool down with the furnace;

[0040] (4) Put the pre-fired powder in a ball mill tank, add zirconia balls and absolute ethanol, and mill for 8 hours (300 rpm);

[0041] (5) adding a paraffin wax binder in a proportion of 8wt% for granulation, passing through an 80-mesh standard sieve;

[0042] (6) Use a tablet press to press the granulated powder into a cylinder of Φ10mm×5mm, and the pressure is about 6MPa;

[0043] ...

Embodiment 3

[0047] composed as figure 1 Shown in 3, the specific preparation method comprises the following steps:

[0048] (1) Calculate the weight percentage of raw materials according to the molar percentage (mol%) of the selected target phase, and then weigh the raw materials;

[0049] (2) Put the weighed powder in a ball mill jar, add zirconia balls and absolute ethanol, and mill for 8 hours (300 rpm);

[0050] (3) After the powder is dried, pass through a 40-mesh standard sieve, pre-fire at 1050°C in the atmosphere for 4 hours, the heating rate is 5°C / min, and then cool down with the furnace;

[0051] (4) Put the pre-fired powder in a ball mill tank, add zirconia balls and absolute ethanol, and mill for 8 hours (300 rpm);

[0052] (5) adding a paraffin wax binder in a proportion of 8wt% for granulation, passing through an 80-mesh standard sieve;

[0053] (6) Use a tablet press to press the granulated powder into a cylinder of Φ10mm×5mm, and the pressure is about 6MPa;

[0054] ...

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Abstract

The invention belongs to the technical field of a special ceramic preparation technology and especially relates to an ultralow loss lithium magnesium titanium-based microwave dielectric ceramic and a preparation method thereof. The composition thereof is Li2Mg3Ti1-x(Mg1 / 3A2 / 3)xO6, wherein A is equal to Nb<5+> or Ta5 and x is more than or equal to 0 but less than or equal to 0.25. The method comprises the following steps: firstly, mixing the raw materials Li2CO3, MgO, TiO2, Nb2O5 and Ta2O5 according to the chemical formula; ball-milling, drying, screening and pre-burning for 4 hours at 1000-1150 DEG C; pressing and forming into a blank after pelletizing; putting the blank into a platinum crucible filled with pre-burned powder in same filling phase and sintering at 1500-1650 DEG C, thereby acquiring the microwave dielectric ceramic. According to the invention, (Mg1 / 3A2 / 3)4+(A= Nb<5+> or Ta<5+>) is adopted for replacing Ti<4+> and the blank is put into the platinum crucible filled with pre-burned powder in same filling phase and is sintered, so that the appearance of impure phase can be effectively restrained and the microwave dielectric property is promoted; the dielectric constant thereof is 13.83-15.40; the temperature coefficient of resonance frequency reaches up to -2.16 to -14.27 ppm / DEG C; the quality factor reaches up to 152,400-208,900 GHz. The microwave dielectric ceramic provided by the invention is simple in preparation process, isenvironmentally friendly in process and is a microwave dielectric material with great promise.

Description

technical field [0001] The invention belongs to the technical field of preparation technology of special ceramics, and in particular relates to an ultra-low loss lithium-magnesium-titanium-based microwave dielectric ceramic material and a preparation method thereof. Background technique [0002] Microwave dielectric ceramic (MWDC) refers to a kind of ceramic used as a dielectric material in microwave frequency circuits to complete microwave signal processing, and is a new type of electronic functional ceramic. With the rapid development of Internet technology, the information capacity is increasing exponentially, the application frequency is developing towards higher frequency bands, and portable terminals and mobile communications are further developing towards miniaturization, high integration and high stability. At the same time, dielectric resonators, filters, capacitors and other devices need to be further improved in terms of electromagnetic wave reception and transmis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/465C04B35/622C04B35/63
CPCC04B35/465C04B35/622C04B35/6303C04B2235/3203C04B2235/3206C04B2235/3232C04B2235/3251C04B2235/602C04B2235/656C04B2235/6567C04B2235/94
Inventor 潘海龙吴海涛
Owner UNIV OF JINAN