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Low-dielectric constant high-quality microwave ceramic medium and production process thereof

A technology of microwave dielectric ceramics and low dielectric constant is applied in the field of novel low dielectric constant and high quality microwave dielectric ceramics and its preparation, which can solve the problems of difficulty in eliminating pyroxene phase, large loss, deterioration of microwave performance, etc., and achieves good mechanical properties. The effect of carrying capacity, anti-moisture mechanical carrying capacity, good signal response speed and signal selectivity

Inactive Publication Date: 2009-05-13
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently Mg 2 SiO 4 It is mainly used as a high-quality dielectric resonator. The key problem lies in the SiO 2 Easily react with MgO to form perovskite structure MgSiO 3 Pyroxene phase, MgSiO 3 The dielectric constant is 6~7, but the loss is very large at 10 -3 It is difficult to eliminate the existence of pyroxene phase through conventional adjustment of sintering process and improvement of heat treatment method, and the existence of pyroxene phase deteriorates the Mg 2 SiO 4 microwave properties, thus eliminating the second phase MgSiO 3 The presence of pyroxene phase becomes necessary

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] According to the present invention, take by weighing 80.6gMgO, 60.1gSiO 2 Pour it into a PTFE tank, add alcohol to 2 / 3 of the tank height to seal the tank, put it into a planetary ball mill for grinding for 12 hours, dry it and then calcinate it at 1000°C for 3 hours, grind it for another 12 hours, dry it and sieve it, add 5wt% PVA After granulation, press into a cylinder with a diameter of 12 mm and a height of 7 mm. After sintering at 1350 ° C for 3 hours, it is cooled to 1050 ° C at a temperature of 5 ° C per minute and then cooled to room temperature in the furnace. The two ends of the ceramics are ground and polished to a height of 5 mm. The microwave performance was tested in the cavity resonator, and the dielectric constant was 7.0, and the Qf value was 80,000 GHz.

Embodiment 2

[0027] Take by weighing 80.6gMgO, 57.1gSiO according to the present invention 2 , 2.6gAl 2 o 3 Pour it into a PTFE tank, add alcohol to 2 / 3 of the tank height to seal the tank, put it into a planetary ball mill for grinding for 24 hours, dry at 1200°C for 3 hours, grind for another 24 hours, dry and sieve, add 5Wt% PVA to granulate , pressed into a cylinder with a diameter of 12mm and a height of 7mm. After sintering at 1400°C for 3 hours, it was cooled at 5°C per minute to 1150°C and cooled to room temperature with the furnace. The two ends of the ceramics were ground and polished to a height of 5mm. The microwave performance was tested in the resonant cavity, and the dielectric constant was 7.1, and the Qf value was 180,000 GHz.

Embodiment 3

[0029] Take by weighing 80.6gMgO, 54.1gSiO according to the present invention 2 , 5.1gAl 2 o 3 Pour it into a PTFE tank, add alcohol to 2 / 3 of the tank height to seal the tank, put it into a planetary ball mill for grinding for 24 hours, dry at 1200°C for 3 hours, grind for another 24 hours, dry and sieve, add 5Wt% PVA to granulate , Pressed into a cylinder with a diameter of 12mm and a height of 7mm. After sintering at 1400°C for 3 hours, it was cooled to 1100°C at a temperature of 5°C per minute and then cooled to room temperature with the furnace. The two ends of the ceramic were ground and polished to a height of 5mm, and placed in a closed-cavity resonant cavity. In the microwave performance test, the dielectric constant is 7.8, and the Qf value is 200,000GHz.

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Abstract

The invention discloses a microwave dielectric ceramic with low dielectric constant and high quality and a method for preparing the same. The chemical composition constitution formula of the microwave dielectric ceramic with low dielectric constant and high quality is Mg2(Si, Al )O4, which consists of MgO, SiO2 and Al2O3, wherein the mol percentage of the MgO to the SiO2 to the Al2O3 is equal to 60-70 to 15-35 to 0-15. The microwave dielectric ceramic with low dielectric constant and high quality is used as a core material for electronic circuit substrates, syntonizers, filters, microwave substrates and microstrip lines, and has important application prospect and economic benefit on electronic circuit, microwave communication, satellite communication and radar system.

Description

technical field [0001] The invention belongs to the field of electronic information materials and devices, and in particular relates to a novel low-permittivity high-quality microwave dielectric ceramic and a preparation method thereof. Background technique [0002] With the rapid development of microwave communication and radar technology, the research of microwave dielectric materials is also developing towards the high-end direction of microwave. The development of microwave dielectric resonators, filters and microwave substrate materials with a dielectric constant less than 10, low loss, high Q value and near-zero resonant frequency temperature coefficient has become a key issue in the development of electronic information technology. At present, the dielectric constants of microwave dielectric materials sold on the market are mainly 16-25 magnesium titanate series, 30-50 medium dielectric constant barium-based and calcium-based perovskite structures, and 70-00 tungsten ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/04C04B35/622
Inventor 宋开新郑梁秦会斌
Owner HANGZHOU DIANZI UNIV
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