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High-quality-factor microwave dielectric ceramic material and preparation method thereof

A microwave dielectric ceramic, high quality factor technology, applied in the field of dielectric ceramic materials, can solve the problems of no microstructure, easy particle agglomeration, high energy consumption, etc., to achieve the effect of superior performance, avoiding molecular agglomeration, and not easy to agglomerate

Inactive Publication Date: 2018-01-16
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the research on microwave dielectric ceramics is a summary of experience obtained through a large number of experiments, but there is no complete theory to explain the relationship between microstructure and dielectric properties, and it is impossible to predict theoretically from the composition and structure of compounds. Its microwave dielectric properties such as resonant frequency temperature coefficient and quality factor
More importantly, the preparation process of microwave dielectric ceramic materials is also one of the main factors affecting the microwave dielectric properties of materials. From commercialized microwave dielectric ceramics to recent microwave dielectric ceramic materials with better comprehensive microwave dielectric properties, the main The preparation method is through the high-temperature solid-phase synthesis method. This is because the method is mature in technology, simple in process and high in production efficiency. Compared with sol-gel method, hydrothermal method, etc., it is more feasible in industrial production Operability and economic value, but the inherent shortcomings of high-temperature solid-phase synthesis, such as high energy consumption and easy agglomeration of particles after ball milling, should still attract sufficient attention in this field

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) According to 0.93Ca 2 Na 6 Al 6 Si 6 O 24 (SO 4 ) 2 -0.07TiO 2 In the molar ratio of Ca:Na:Al:Si:S:Ti, the raw materials containing each element (respectively CaCO 3 , Na 2 CO 3 , Al 2 O 3 , SiO 2 , (NH 4 ) 2 SO 4 , TiO 2 ), then carry out wet ball milling with the weighed raw materials for 2 hours; dry after the ball milling to obtain the raw material mixture powder; compress the powder into a block, and keep it at 980 ° C for 4 hours to obtain a sample sinter;

[0022] (2) Grind the sample sinter into pieces, put it into a ball mill tank, and the ball mill tank is pre-filled with zirconia balls and deionized water; put the ball mill tank into the ball mill, set the revolution speed of the ball mill to be 280rpm per minute, and the wet ball mill 2 Stop after 1 hour; add a small amount of dispersant into the ball mill, and then perform ball milling for 1 hour in the rotation mode of the ball mill at 300 rpm per minute, and dry the sample powder after...

Embodiment 2

[0028] In step (1) of embodiment 1, according to 0.88Ca 2 Na 6 Al 6 Si 6 O 24 (SO 4 ) 2 -0.12TiO 2 In the molar ratio of Ca:Na:Al:Si:S:Ti, the raw materials containing each element were weighed; in step (4) of Example 1, the sieved particles were pressed into shape, and then sintered at 1110 ° C for 4 The other steps (including raw materials) are the same as in Example 1, and the composition and addition amount of the dispersant, deionized water and ethanol mixture are the same as those in Example 1, and a high quality factor microwave dielectric ceramic material is obtained.

[0029] The microwave dielectric properties of this group of ceramic materials are as follows: the dielectric constant is 9.3, the quality factor is 84400GHz, and the temperature coefficient of resonance frequency is -5.7ppm / ℃.

Embodiment 3

[0031] In step (1) of embodiment 1, according to 0.84Ca 2 Na 6 Al 6 Si 6 O 24 (SO 4 ) 2 -0.16TiO 2 In the molar ratio of Ca:Na:Al:Si:S:Ti, the raw materials containing each element were weighed; in step (4) of Example 1, the sieved particles were pressed into shape, and then sintered at 1125 ° C for 4 The other steps (including raw materials) are the same as in Example 1, and the composition and addition amount of the dispersant, deionized water and ethanol mixture are the same as those in Example 1, and a high quality factor microwave dielectric ceramic material is obtained.

[0032] The microwave dielectric properties of this group of ceramic materials are: the dielectric constant is 9.9, the quality factor is 78600GHz, and the temperature coefficient of resonance frequency is 4.1ppm / ℃.

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Abstract

The invention discloses a high-quality-factor microwave dielectric ceramic material and a preparation method thereof. A structural expression formula of the ceramic material is (1-y)Ca2Na6Al6Si6O24(XO4)2-yTiO2, wherein y is greater than or equal to 0.07 and less than or equal to 0.16, and X is one of S, Mo and W. The material is prepared through a traditional high-temperature solid-phase synthesismethod; a small amount of dispersant is added in a secondary ball milling process, and then the material is subjected to ultrasonic vibration under a hot environment, so that powder particles of a sample are not easy to agglomerate. The material prepared by the preparation method is sintered well at 1075 DEG C to 1125 DEG C and has the characteristics that the dielectric constant is 8.5 to 10.6,the quality factor Qf value reaches 78600GHz to 117000GHz and the resonant frequency temperature coefficient is small. Meanwhile, the invention discloses Ca2Na6Al6Si6O24(XO4)2 (X is one of S, Mo and W) ceramic with a hauynite structure for the first time, and the ceramic has good microwave dielectric performance.

Description

technical field [0001] The invention relates to a dielectric ceramic material, in particular to a dielectric ceramic material used for manufacturing microwave components such as ceramic substrates, resonators and filters used in microwave frequencies and a preparation method thereof. Background technique [0002] In recent years, with the continuous development of microwave mobile communication technology towards high frequency and digitization, the requirement for modularization of components is becoming more and more urgent. Low Temperature Co-fired Ceramics (LTCC) requires microwave dielectric materials with excellent performance, low sintering temperature (≤900°C), and compatibility with Ag electrode co-firing, which makes it an electronic device module one of the main technologies of The sintering temperature of the current commercial microwave dielectric ceramic material systems is generally higher than 1300 °C, and cannot be directly co-fired with low melting point m...

Claims

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Application Information

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IPC IPC(8): C04B35/19C04B35/495C04B35/622C04B35/626C04B35/634
Inventor 苏聪学覃杏柳郑彬宁方亮刘来君
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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