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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AI-Extracted 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...

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.

Technology Topic

Solid phasesMicrowave dielectric properties +2

Examples

Experimental program(10)

Example Embodiment

[0020] Example 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 ball milling;

[0023] (3) Put the dried sample powder into a ball mill tank containing a certain proportion of deionized water and ethanol mixture, and then put the ball mill tank into an ultrasonic cleaning machine, and the ultrasonic cleaning machine is equipped with water , the ball mill tank is fixed in water, and the height of the water is half of the height of the ball mill tank; set the heating and heat preservation program of the ultrasonic cleaning machine, heat the water in the cleaning machine to 40 ℃ and keep warm at this temperature; then close the ball mill tank lid, turn on the ultrasonic Vibration, the sample powder was ultrasonically vibrated in a sealed environment, the ultrasonic frequency was 50kHz, and the ultrasonic vibration was 30 minutes; then the lid of the ball mill was removed, and the temperature of the water in the ultrasonic cleaning machine was heated to 95 °C and kept at this temperature, and ultrasonically vibrated for 30 minutes. Ultrasonic frequency is 30kHz;

[0024] (4) Drying after ultrasonic vibration to obtain sample powder, then granulated and sieved, the sieved particles are pressed into shape, and then sintered at 1090 ° C for 4 hours to obtain a high quality factor microwave dielectric ceramic material .

[0025] The aforementioned dispersant is a mixture liquid of sodium polyacrylate, sodium hexametaphosphate, sodium pyrophosphate and polyethylene glycol, and the amount of the dispersant added is 0.1% of the sample mass; sodium polyacrylate, sodium hexametaphosphate The mass ratio of , sodium pyrophosphate and polyethylene glycol is 3:1:1:1. The deionized water and ethanol mixed solution in the aforementioned step (3) is composed of the following proportions: weight of deionized water: weight of ethanol=1:9.

[0026] The microwave dielectric properties of this group of ceramic materials are as follows: the dielectric constant is 8.5, the quality factor is 101000 GHz, and the temperature coefficient of resonance frequency is -13.6 ppm/℃.

Example Embodiment

[0027] Example 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/℃.

Example Embodiment

[0030] Example 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/℃.

PUM

Property	Measurement	Unit
Quality factor	101000.0	GHz
Resonant frequency temperature coefficient	13.6	parts_per_million/Δ°C
Quality factor	84400.0	GHz

Description & Claims & Application Information

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

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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