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Mg2SiO4 dielectric constant microwave ceramic medium and its producing process

A technology of microwave dielectric ceramics and low dielectric constant is applied in the field of Mg2SiO4 low dielectric constant microwave dielectric ceramics and its preparation, which can solve the problems of large loss, difficulty in eliminating pyroxene phase, deterioration, etc., and achieves reduction of ceramic loss and good signal. Response speed and signal selectivity, the effect of improving quality factor

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

[0003] Mg currently on the market 2 SiO 4 It is mainly used as an electronic circuit substrate, and the key problem is that SiO 2 Easily react with MgO to form perovskite structure MgSiO 3 Pyroxene phase, MgSiO 3 The dielectric constant is 6-8, but the loss is very large at 10 -3 Left and right, it is difficult to eliminate the existence of pyroxene phase through traditional adjustment of sintering process and improvement of heat treatment method, and the existence of pyroxene phase deteriorates the Mg 2 SiO 4 microwave properties, 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 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, sintered at 1350°C for 3 hours, cooled at a temperature of 5°C per minute to 1050°C and cooled to room temperature with the furnace, took out the ceramics, ground and polished both ends into a cylinder with a height of 5mm, and then passed ultrasonic waves Clean and put it into a closed-cavity resonator to test the microwave performance, and the ceramic dielectric constant is 7.0 and the Qf value is 80,000GHz.

Embodiment 2

[0027] According to the present invention, take by weighing 82.6gMgO, 60.1gSiO by non-stoichiometric Mg / Si=2.05 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 to grind for 24 hours, then dry it, calcinate it at 1200°C for 3 hours, grind it for another 24 hours, dry it and sieve it, add 5Wt% After PVA granulation, press it into a cylinder with a diameter of 12 mm and a height of 7 mm. After sintering at 1400 ° C for 3 hours, cool it to 1100 ° C at a temperature control of 5 ° C per minute and cool to room temperature with the furnace, take out the ceramics, and grind and polish both ends to form a cylinder with a height of 5 mm. After ultrasonic cleaning, it was put into a closed-cavity resonator to test the microwave performance, and the dielectric constant of the ceramic was 7.1, and the Qf value was 200,000 GHz.

Embodiment 3

[0029] According to the present invention, take by weighing 86.6gMgO, 60.1gSiO by non-stoichiometric Mg / Si=2.15 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 to grind for 24 hours, then dry it, calcinate it at 1200°C for 3 hours, grind it for another 24 hours, dry it and sieve it, add 5Wt% After PVA granulation, press it into a cylinder with a diameter of 12 mm and a height of 7 mm. After sintering at 1500 ° C for 3 hours, control the temperature at 5 ° C per minute and cool it to 1200 ° C. Cool to room temperature with the furnace, take out the ceramics, and grind and polish both ends to form a cylinder with a height of 5 mm. After ultrasonic cleaning, it was put into a closed-cavity resonator to test the microwave performance, and the dielectric constant of the ceramic was 7.7, and the Qf value was 180,000 GHz.

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Abstract

The invention discloses an Mg2SiO4 microwave dielectric ceramic with low dielectric constant and a method for preparing the same. The invention obtains a single phase high purity Mg2SiO4 ceramic through controlling the nonstoichiometric ratio of Mg to Si. The method overcomes the defect that the ceramic is easy to generate a second phase after the prior sintering according to the molar ratio of a chemical formula 2MgO.SiO2. The Mg2SiO4 ceramic obtained by the method has a low dielectric constant between 6 and 8, the dielectric loss thereof is less than 10<-5>, and the Qf thereof is more than 160, 000 GHz. The high-quality microwave dielectric ceramic with low dielectric constant is used as a material for manufacturing electronic circuit substrates, dielectric resonators, filters, microwave substrates and microstrip lines, and has important application prospect and great economic value in the fields of electronic circuit, microwave mobile communication, satellite communication and radar system.

Description

technical field [0001] The invention belongs to the field of electronic information materials and devices, in particular to a Mg 2 SiO 4 Low dielectric constant microwave dielectric ceramic and its preparation method. 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 barium-calcium perovskite structure and 70-100 tungsten bronze structure microwave dielectric materials. For microwa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/20C04B35/622
Inventor 宋开新陈湘明
Owner HANGZHOU DIANZI UNIV
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