Microwave dielectric ceramic material and preparation method thereof

A technology of microwave dielectric ceramics and ceramics, applied in the field of functional ceramic materials, can solve problems such as low Q*f value, high sintering temperature, and non-adjustable temperature drift, and achieve high Q*f value, broad development prospects, and convenient sintering Effect

Active Publication Date: 2018-11-16
GUANGDONG GOVA ADVANCED MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the Q*f values ​​of the above systems are all low, and the sintering temperatures are all higher than 1300, which cannot meet the requirements
In order to achieve low loss, Jawahar et al. and Okawa et al. respectively modified the complex hexagonal perovskite structure ceramics, and obtained SrLa with Q*f values ​​of 46000GHz and 50215GHz, respectively. 4 Ti 4 o 15 and BaLa 4 Ti 4 o 15 Microwave dielectric ceramics, but there are problems that the dielectric constant is too large from 45° and the temperature drift cannot be adjusted.

Method used

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Examples

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preparation example Construction

[0052] The present invention also provides a preparation method of the microwave dielectric ceramic material described in the above technical solution, comprising the following steps:

[0053] a) Set the MCO 3 , La 2 o 3 、TiO 2 and M' 2 o 3 After mixing, the first grinding treatment is carried out, and the ceramic main material MLa is obtained after calcination. 4 Ti 3 M'O 15 ; among them, MCO 3 for CaCO 3 、BaCO 3 or MgCO 3 ;M' 2 o 3 for Al 2 o 3 , Sb 2 o 3 or Bi 2 o 3 ;

[0054] b) After mixing the main ceramic material and additives obtained in step a), perform a second grinding treatment, granulation treatment and compression molding to obtain a ceramic green body;

[0055] c) Sintering the ceramic green body obtained in step b) to obtain a microwave dielectric ceramic material.

[0056] The present invention first MCO 3 , La 2 o 3 、TiO 2 and M' 2 o 3 After mixing, the first grinding treatment is carried out, and the ceramic main material MLa is o...

Embodiment 1

[0083] (1) Preparation of ZBS sintering aid: weigh ZnO and B respectively according to mass percentage 55:13:32 2 o 3 and SiO 2 And mix, add ethanol as the ball milling medium, after 24 hours of planetary ball milling, put it into a freeze dryer to dry for 36 hours and then pass through a 300-mesh screen; then put it into a quartz crucible and melt it at 1500°C for 0.5 hours, then quickly pass through a cold rolling mill to obtain flakes , Grinding and crushing flakes through a 200-mesh sieve to obtain ZBS sintering aid.

[0084] (2) Weigh BaCO according to the molar ratio of 2:4:6:1 3 , La 2 o 3 、TiO 2 、Al 2 o 3 , then mixed ball milling in pure water medium for 12 hours, dried and passed through a 100-mesh sieve, and calcined at 1050 ° C for 3 hours to obtain the main ceramic material BaLa 4 Ti 3 AlO 15 .

[0085] (3) adding additives to the ceramic main material obtained in step (2), ball milling in pure water medium for 24 hours, then drying and sieving to obtai...

Embodiment 2

[0091] (1) Preparation of ZBS sintering aid: weigh ZnO and B respectively according to mass percentage 55:13:32 2 o 3 and SiO 2 And mix, add ethanol as the ball milling medium, after 24 hours of planetary ball milling, put it into a freeze dryer to dry for 36 hours and then pass through a 300-mesh screen; then put it into a quartz crucible and melt it at 1500°C for 0.5 hours, then quickly pass through a cold rolling mill to obtain flakes , Grinding and crushing flakes through a 200-mesh sieve to obtain ZBS sintering aid.

[0092] (2) Weigh BaCO according to the molar ratio of 2:4:6:1 3 , La 2 o 3 、TiO 2 、 Bi 2 o 3 , and then mixed ball milling in pure water medium for 12 hours, dried and passed through a 100-mesh sieve, and calcined at 1000 ° C for 3 hours to obtain the main ceramic material BaLa 4 Ti 3 BiO 15 .

[0093] (3) adding additives to the ceramic main material obtained in step (2), ball milling in pure water medium for 24 hours, then drying and sieving to ...

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Abstract

The invention provides a microwave dielectric ceramic material prepared by a composite oxide and an additive. The composite oxide is represented by the following general formula: MLa4Ti3M'O15, whereinM is Ca, Ba or Mg, and M' is Al, Sb or Bi. Compared with the prior art, the microwave dielectric ceramic material provided by the invention is prepared by the compound oxide represented by a specificgeneral formula and the additive and is a medium-dielectric-constant microwave dielectric ceramic; the microwave dielectric ceramic material satisfies the dielectric constant near 45 and is continuously adjustable, has an extremely high Q*f value and good sintering stability, and also can achieve continuous adjustment of temperature drift to meet various needs. Experimental results show that therelative dielectric constant [epsilon]r of the microwave dielectric ceramic material provided by the invention is 43.2-46.8, the quality factor Q*f value is more than or equal to 46200 GHz, and the sintering is stable; at the same time, the temperature drift adjusting range is from -8 to +13 ppm/DEG C and can be continuously adjustable to meet various needs, and the microwave dielectric ceramic material has excellent application value and market potential.

Description

technical field [0001] The invention relates to the technical field of functional ceramic materials, and more specifically relates to a microwave dielectric ceramic material and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics refer to ceramic materials that are used as dielectric materials in microwave frequency circuits and perform one or more functions. In recent years, microwave dielectric ceramics have become key materials for realizing microwave waveguides, dielectric isolation and dielectric resonance, and are used in key components in microwave communication systems such as resonators, filters, microwave dielectric antennas, frequency stabilized oscillators and phase shifters. has been commercially applied. With the application of microwave technology in wireless communication and satellite communication systems, attention has been paid to high-frequency microwave, which gradually releases civilian restrictions, and new techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/64
CPCC04B35/50C04B35/64C04B2235/3217C04B2235/3232C04B2235/3294C04B2235/3298C04B2235/442C04B2235/96
Inventor 刘超吴悦广周星星
Owner GUANGDONG GOVA ADVANCED MATERIAL TECH
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