Microwave dielectric ceramic and preparation method thereof

A technology of microwave dielectric ceramics and mass ratio, applied in the field of new materials and microwave communication, can solve the problems of unstable structure, high sintering temperature and performance deterioration, and achieve the effects of stable structure, low sintering temperature and high Q*f value

Inactive Publication Date: 2018-11-23
GUANGDONG GOVA ADVANCED MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the structure of this system is unstable, the sintering temperature is high, and the performance is greatly deteriorated due to titanium reduction, which limits its further application.

Method used

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  • Microwave dielectric ceramic and preparation method thereof

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preparation example Construction

[0048] The present invention also provides a method for preparing microwave dielectric ceramics described in the above technical solution, comprising the following steps:

[0049] a) BaCO 3 、Sm 2 o 3 、TiO 2 and MnO 2 After mixing, the first grinding treatment is carried out, and then pre-sintering is carried out to obtain pre-sintered material; then the obtained pre-sintered material is subjected to second grinding treatment to obtain powder;

[0050] b) The powder obtained in step a) is granulated and ground with a binder, sieved, pressed and sintered in sequence to obtain microwave dielectric ceramics.

[0051] In the present invention, BaCO 3 、Sm 2 o 3 、TiO 2 and MnO 2 After mixing, the first grinding treatment is carried out, and then pre-sintering is carried out to obtain pre-sintered material; then the obtained pre-sintered material is subjected to second grinding treatment to obtain powder. The present invention is to described BaCO 3 、Sm 2 o 3 、TiO 2 and ...

Embodiment 1

[0077] (1) Weigh 51.4861g BaCO 3 、98.7519g Sm 2 o 3 and 99.7620g TiO 2 , mix the above-mentioned raw materials, zirconium balls and deionized water in a mass ratio of 1:3:2, use the planetary mill wet method at a speed of 250r / min for 4h, then dry at 120°C, and then Pre-fired at 1000°C (heating rate: 3°C / min) in the atmosphere for 3 hours, and cooled with the furnace to obtain the pre-fired material.

[0078] (2) Mix the calcined material obtained in step (1), zirconium balls and deionized water at a mass ratio of 1:3:2, use planetary wet method to ball mill at a speed of 250r / min for 4 hours, and then bake at 120°C Dry to obtain powder.

[0079] (3) Add the binder of 20% of the powder mass in the powder obtained in step (2), granulate and grind for 1h, then pass through an 80-mesh sieve, and then press the obtained powder under a pressure of 100MPa into a thickness of 6mm and 13mm in diameter thin cylindrical green body, and finally sinter the above green body at 1350°C ...

Embodiment 2

[0085] (1) Weigh 51.5089g BaCO 3 、98.7957g Sm 2 o 3 , 99.6954g TiO 2 and 0.6135g MnO 2 , mix the above-mentioned raw materials, zirconium balls and deionized water in a mass ratio of 1:3:2, use the planetary mill wet method at a speed of 250r / min for 4h, then dry at 120°C, and then Pre-fired at 1000°C (heating rate: 3°C / min) in the atmosphere for 3 hours, and cooled with the furnace to obtain the pre-fired material.

[0086] (2) Mix the calcined material obtained in step (1), zirconium balls and deionized water at a mass ratio of 1:3:2, use planetary wet method to ball mill at a speed of 250r / min for 4 hours, and then bake at 120°C Dry to obtain powder.

[0087] (3) Add the binder of 20% of the powder mass in the powder obtained in step (2), granulate and grind for 1h, then pass through an 80-mesh sieve, and then press the obtained powder under a pressure of 100MPa into a thickness of 6mm and 13mm in diameter thin cylindrical green body, and finally sinter the above gree...

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Abstract

The invention provides microwave dielectric ceramic. The microwave dielectric ceramic comprises compound oxide; the compound oxide has a general formula shown as follows: Ba2-xSm4+2 / 3xTi9-yMnyO26, wherein x is greater than or equal to 0 and less than or equal to 0.32 and y is greater than or equal to 0 and less than or equal to 0.02. Compared with the prior art, the microwave dielectric ceramic provided by the invention takes the compound oxide shown as the specific general formula as a main body material, the dielectric constant can be adjusted in a range of 73 to 80 through adjusting the content of Sm and the frequency-temperature coefficient is continuously adjustable; on one hand, Ti is replaced with less Mn and is used as an acceptor for doping; on one hand, the radius of an Mn atom is slightly greater than the Ti; when the Mn is added, a space structure can be stabilized and the Q*f value is improved; on the other hand, the reduction of the Ti is inhibited by utilizing valence alternation of the Mn in a sintering process, so that the Q*f value is improved; the microwave dielectric ceramic is stable in structure and low in sintering temperature and has relatively high dielectric constant and Q*f value; meanwhile, the resonance frequency-temperature coefficient is continuously adjustable so that the microwave dielectric ceramic has a very wide application prospect in the field of microwave communication and large-scale commercial utilization can be realized.

Description

technical field [0001] The invention relates to the technical field of new materials and microwave communication, and more specifically relates to a microwave dielectric ceramic and a preparation method thereof. Background technique [0002] With the continuous development of modern communication technology, people have higher and higher requirements for the miniaturization, high performance and low cost of mobile communication equipment. This trend largely depends on the dielectric constant of the dielectric material used. At the same resonant frequency, the larger the dielectric constant, the smaller the wavelength, and the smaller the size of the corresponding dielectric resonator; at the same time, the larger the dielectric constant, the more electromagnetic energy is concentrated in the medium, and the less affected by the surrounding environment. Therefore, high dielectric constant materials are not only conducive to the miniaturization of equipment, but also to high p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/50
CPCC04B35/462C04B35/50C04B2235/3206C04B2235/3215C04B2235/3217C04B2235/3224C04B2235/3267C04B2235/3284C04B2235/3409C04B2235/3418
Inventor 殷旺曹顺顺余勋新马才兵
Owner GUANGDONG GOVA ADVANCED MATERIAL TECH
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