Microwave dielectric ceramic material with low intrinsic sintering temperature and preparation method thereof

A technology for microwave dielectric ceramics and ceramic materials, which is applied in the field of low inherent sintering temperature microwave dielectric ceramic materials and their preparation, can solve the problems of limited sintering temperature, limited degree of sintering temperature reduction, and difficulty in obtaining, and achieves Q× The effect of high f value, low sintering temperature and excellent microwave performance

Inactive Publication Date: 2012-04-25
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the extent to which this method can reduce the sintering temperature is limited (it is not easy to obtain dielectric ceramics with a sintering temperature lower than 900 ° C), and high doping sintering aids will deteriorate the microwave dielectric properties of the material to varying degrees
Another method is to use ultrafine powder as the initial raw material, but the preparation process of ultrafine powder is complicated. For most materials, the degree of sintering temperature reduction is limited, and it is difficult to meet actual needs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] 1) Li with a purity ≥ 99% 2 CO 3 , MgO, TiO 2 As the main raw material, according to the molecular formula Mg(Li 2 / 3 Ti 4 / 3 )O 4 Calcination to synthesize the main powder;

[0013] 2) Then add alcohol and zirconium balls to the weighed main powder according to the weight ratio of main powder: alcohol: zirconium balls is 1: 1: 2, mix for 4 hours by wet grinding method, and grind it at 140°C Drying, briquetting, and then raising the compressed block-shaped raw material from room temperature to 950°C at a heating rate of 5°C / min and keeping it at this temperature for 6 hours to make a sintered block, and crushing to obtain the main crystal phase powder;

[0014] 3) Mole ratio Mg(Li 2 / 3 Ti 4 / 3 )O 4 :TiO 2 =0.985:0.015 Add TiO to the main crystal phase powder obtained in step (2) 2 Get the powder, then add alcohol and zirconium balls according to the weight ratio of powder: alcohol: zirconium balls is 1: 1: 2, put them into a nylon jar and ball mill for 4 hours, ta...

Embodiment 2

[0016] 1) Li with a purity ≥ 99% 2 CO 3 , MgO, TiO 2 As the main raw material, according to the molecular formula Mg(Li 2 / 3 Ti 4 / 3 )O 4 Calcination to synthesize the main powder;

[0017] 2) Then add alcohol and zirconium balls to the weighed main powder according to the weight ratio of main powder: alcohol: zirconium balls is 1: 1: 2, mix for 4 hours by wet grinding method, and grind it at 140°C Drying, briquetting, and then pressing into a block, and then raising the pressed block raw material from room temperature to 950°C at a heating rate of 5°C / min and keeping it at this temperature for 6 hours to make a sintered block, and crushing to obtain the main crystal Phase powder;

[0018] 3) Mole ratio Mg(Li 2 / 3 Ti 4 / 3 )O 4 :TiO 2 =0.975:0.025 Add TiO to the main crystal phase powder obtained in step (2) 2 Get the powder, then add alcohol and zirconium balls according to the weight ratio of powder: alcohol: zirconium balls is 1: 1: 2, put them into a nylon jar and ba...

Embodiment 3

[0020] 1) Li with a purity ≥ 99% 2 CO 3 , MgO, TiO 2 As the main raw material, according to the molecular formula Mg(Li 2 / 3 Ti 4 / 3 )O 4 Calcination to synthesize the main powder;

[0021] 2) Then add alcohol and zirconium balls to the prepared main powder according to the weight ratio of main powder: alcohol: zirconium balls is 1:1:2, mix for 4 hours by wet grinding method, grind and bake at 140°C Drying, briquetting, and then raising the pressed block raw material from room temperature to 950°C at a heating rate of 5°C / min and keeping it at this temperature for 6 hours to make a sintered block, and crushing to obtain the main crystal phase powder;

[0022] 3) Mole ratio Mg(Li 2 / 3 Ti 4 / 3 )O 4 :TiO 2 =0.95:0.05 Add TiO to the main crystal phase powder obtained in step (2) 2 Get the powder, then add alcohol and zirconium balls according to the weight ratio of powder: alcohol: zirconium balls is 1: 1: 2, put them into a nylon jar and ball mill for 4 hours, take them out...

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Abstract

The invention discloses a microwave dielectric ceramic material with a low intrinsic sintering temperature and a preparation method thereof. Main raw materials of Li2O3 and MgO or Co2O3 and TiO2, that have a purity no less than 99%, are calcined and synthesized into a main powder, according to a molecular formula of M (Li2 / 3Ti4 / 3)O4, wherein M represents Mg or Co; then TiO2 or CaTiO3 is added into the main powder to adjust a temperature coefficient of resonance frequency of the main powder, so as to obtain a microwave dielectric material with a high dielectric constant and Q*f and a temperature coefficient of resonance frequency near zero. The microwave dielectric ceramic prepared by the invention has a low sintering temperature no more than 1100 DEG C and excellent microwave performances of high dielectric constant (epsilon r), high Q*f value and low tau f, and can be used in manufacture of microwave devices, such as resonator, microwave antenna and filter, etc.

Description

technical field [0001] The invention belongs to the field of electronic ceramics and its manufacture, and relates to a low intrinsic sintering temperature microwave dielectric ceramic material and a preparation method thereof. Background technique [0002] With the rapid development of information technology, the demand for miniaturization, portability, multi-function, digitalization, high reliability and high performance of electronic complete machines has further promoted the direction of miniaturization, integration and high frequency of electronic components. develop. Low-temperature cofired ceramics (LTCC) technology is one of the main ways to achieve this requirement. The application of LTCC technology requires microwave dielectric ceramic materials to be co-fired with high-conductivity metal electrodes Cu and Ag. Therefore, reducing the sintering temperature of the material so that it can be co-fired with Ag or Cu is the main direction of microwave dielectric cerami...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/622
Inventor 刘晓斌周焕福陈秀丽王一良方亮
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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