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A medium dielectric constant high q microwave dielectric ceramic material and preparation method thereof

A microwave dielectric ceramic and dielectric constant technology, applied in the field of electronic functional materials and devices, can solve problems such as inability to meet, and achieve the effects of increasing the Q×f value, reducing dielectric loss, and reducing the concentration of defects such as oxygen vacancies

Active Publication Date: 2022-05-10
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the demand for miniaturization and high frequency selectivity of high-performance filters and capacitors in mobile communication base station equipment, base station filters and capacitors require microwave dielectric ceramic materials with higher dielectric constant and extremely low dielectric loss. At present, the medium dielectric constant (about 40) of dielectric filters and microwave capacitors that can be used in base stations, and the Q×f value of microwave dielectric ceramics with near-zero resonance frequency temperature coefficient are generally below 50,000 GHz, which cannot meet the requirements of the new generation of mobile communication base stations. To meet the requirements of filters and microwave capacitors, it is of great practical significance to develop a microwave dielectric ceramic material with a medium dielectric constant and a higher Q

Method used

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  • A medium dielectric constant high q microwave dielectric ceramic material and preparation method thereof
  • A medium dielectric constant high q microwave dielectric ceramic material and preparation method thereof
  • A medium dielectric constant high q microwave dielectric ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) According to the mass fraction of 2.1% BaO, 5.7% SrO, 63.5% La 2 o 3 , 27.5%TiO 2 , 1.2% Al 2 o 3 Proportioning, weigh barium carbonate, strontium carbonate, lanthanum oxide, titanium dioxide (rutile phase), aluminum oxide, add the alcohol of suitable content, carry out planetary ball mill 8 hours;

[0028] 2) Dry the slurry, pre-fire it at 1450°C for 4 hours after sieving;

[0029] 3) Ball mill the obtained powder for another 4 hours, dry and sieve, add an appropriate amount of polyvinyl alcohol aqueous solution (PVA), grind and granulate, and shape by dry pressing.

[0030] 4) Finally, debinding the green body at 600°C for 4 hours, and then sintering at 1600°C for 4 hours to obtain the ceramic material with the desired chemical composition ratio.

[0031] SEM surface morphology of ceramics as figure 1 As shown, it can be seen that the density of ceramics is higher, the pores are less, and its bulk density is 6.1g / cm 3 , with an average grain size of 3 μm. T...

Embodiment 2

[0033] 1) According to the mass fraction of 2.9% BaO, 7.7% SrO, 60.8% La 2 o 3 , 22.3%TiO 2 , 6.3% Al 2 o 3 Proportioning, weigh barium carbonate, strontium carbonate, lanthanum oxide, titanium dioxide (rutile phase), aluminum oxide, add the alcohol of suitable content, carry out planetary ball mill 8 hours;

[0034] 2) Dry the slurry, pre-fire it at 1450°C for 4 hours after sieving;

[0035] 3) Ball mill the obtained powder for another 4 hours, dry and sieve, add an appropriate amount of polyvinyl alcohol aqueous solution (PVA), grind and granulate, and shape by dry pressing.

[0036] 4) Finally, debinding the green body at 600°C for 4 hours, and then sintering at 1650°C for 4 hours to obtain the ceramic material with the desired chemical composition ratio.

[0037] SEM surface morphology of ceramics as image 3 As shown, it can be seen that the density of ceramics is higher, the pores are less, and its bulk density is 6.1g / cm 3 . The dielectric constant measured by a...

Embodiment 3

[0039] 1) According to the mass fraction of 2.8% BaO, 7.6% SrO, 59.6% La 2 o 3 , 30.0%TiO 2 Proportioning, weigh barium carbonate, strontium carbonate, lanthanum oxide, titanium dioxide (rutile phase), add the alcohol of suitable content, carry out planetary ball mill 8 hours;

[0040] 2) Dry the slurry, pre-fire it at 1450°C for 4 hours after sieving;

[0041] 3) Ball mill the obtained powder for another 4 hours, dry and sieve, add an appropriate amount of polyvinyl alcohol aqueous solution (PVA), grind and granulate, and shape by dry pressing.

[0042] 4) Finally, debinding the green body at 600°C for 4 hours, and then sintering at 1600°C for 4 hours to obtain the ceramic material with the desired chemical composition ratio.

[0043] The bulk density of ceramics is 6.0g / cm 3 . The dielectric constant measured by a network analyzer is 48.1, the Q×f value is 51600GHz, and the temperature coefficient of the resonant frequency is -0.8ppm / ℃.

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Abstract

The invention discloses a medium dielectric constant high-Q microwave dielectric ceramic material and a preparation method thereof, which belong to the technical field of electronic functional materials and devices. Described ceramic material is made of BaO, SrO, La 2 o 3 、TiO 2 and Al 2 o 3 Composition, its weight percentage is: 0.1% ~ 3.0% BaO, 0.1% ~ 8.0% SrO, 59% ~ 74% La 2 o 3 , 21% ~ 30% TiO 2 ,0.1%~7.0%Al 2 o 3 ; The dielectric constant of the ceramic material is 39.2-48.6, the Q×f value is 51600-89900 GHz, and the temperature coefficient of resonance frequency is -0.8-30.3 ppm / °C. Compared with microwave dielectric ceramic materials with similar dielectric constants, the microwave dielectric ceramic materials of the present invention have a higher Q×f value and a near-zero resonant frequency temperature coefficient, and are expected to be used for making dielectric resonators, dielectric filters and High-performance microwave devices such as microwave capacitors.

Description

technical field [0001] The invention belongs to the technical field of electronic functional materials and devices, in particular to a medium dielectric constant high-Q microwave dielectric ceramic material and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics are ceramic materials used in microwave frequency circuits as dielectric materials to perform one or more functions. Because of their low loss and good temperature stability, they are used as resonators, filters, and dielectrics in modern communications. Microwave devices such as antennas. With the development of high-frequency mobile communication technology, the performance requirements of microwave devices are getting higher and higher, and microwave dielectric ceramics are required to have extremely low loss, good temperature stability and high dielectric constant. With the demand for miniaturization and high frequency selectivity of high-performance filters and capacitors i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/50C04B35/622
CPCC04B35/50C04B35/622C04B2235/3215C04B2235/3213C04B2235/3232C04B2235/3217C04B2235/602C04B2235/6567C04B2235/768C04B2235/77C04B2235/786
Inventor 岳振星骆宇郭蔚嘉陈雨谷卞帅帅
Owner TSINGHUA UNIV
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