Microwave dielectric ceramic material with low dielectric constant and preparation method thereof

A technology of microwave dielectric ceramics and low dielectric constant, applied in the field of electronic information materials, can solve the problems of high dielectric constant and high sintering temperature, and achieve the effect of low cost of raw materials and processes

Active Publication Date: 2021-03-09
无锡鑫圣慧龙纳米陶瓷技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of high sintering temperature and large dielectric constant in the prior art, so as to provide a microwave dielectric ceramic material with low dielectric constant and its preparation method

Method used

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  • Microwave dielectric ceramic material with low dielectric constant and preparation method thereof

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preparation example Construction

[0026] The present application also provides a method for preparing a microwave dielectric ceramic material with a low dielectric constant, which is used to prepare the above-mentioned microwave dielectric ceramic material with a low dielectric constant. It is characterized in that it includes the following steps:

[0027] S1: Weigh the aMgSiO by molar ratio 3 -bcordierite-cCaSiO 3 Each starting material in the indicated composition is prepared into a slurry;

[0028] S2: Calcining the slurry after drying to synthesize matrix powder;

[0029] S3: The matrix powder uses deionized water as the dispersion medium, and the mixed powder formed by the matrix powder and deionized water is dispersed, pulverized and dried by a pulverization process;

[0030] S4: Add PVA aqueous solution to the mixed powder, mix and then granulate, and press to form a cylindrical green body;

[0031] S5: Firing the microwave dielectric ceramics at an environment of 1250-1350°C for 2-10 hours.

Embodiment 1

[0034] Weigh out 50% MgSiO 3 , 20% cordierite and 30% CaSiO 3 Mix with deionized water as the dispersion medium, and use the crushing process to disperse and pulverize the ingredients to make a slurry; after drying the slurry, calcinate it at 1100°C for 2 hours to synthesize the matrix powder.

[0035] The matrix powder uses deionized water as the dispersion medium, and the mixed powder of the matrix powder and deionized water is dispersed, pulverized and dried by the pulverization process; then, PVA aqueous solution is added to the mixed powder and mixed for granulation. Press the cylindrical green body under the pressure of 4MPa; finally, in the atmosphere, heat the microwave dielectric ceramics at 1250°C for 2 hours.

Embodiment 2

[0037] Weigh out 50% MgSiO 3 , 20% cordierite and 30% CaSiO 3 Mix with deionized water as the dispersion medium, and disperse and pulverize the sub-materials by pulverization process to make slurry; after drying the slurry, it is calcined at 1150°C for 5 hours to synthesize matrix powder.

[0038] The matrix powder uses deionized water as the dispersion medium, and the mixed powder of the matrix powder and deionized water is dispersed, pulverized and dried by the pulverization process; then, PVA aqueous solution is added to the mixed powder and mixed for granulation. Under the pressure of 4MPa, it is pressed into a cylindrical green body; finally, in the atmosphere, it is kept at 1350°C for 5 hours and fired into microwave dielectric ceramics.

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Abstract

The invention relates to the technical field of electronic information materials, in particular to a microwave dielectric ceramic material with a low dielectric constant and a preparation method thereof, and aims to solve the problems of over-high sintering temperature and large dielectric constant in the prior art. The microwave dielectric ceramic material with the low dielectric constant is characterized in that the microwave dielectric ceramic material with the low dielectric constant is a composition represented by a chemical formula aMgSiO3-b cordierite-cCaSiO3, a, b and c independently represent molar ratios and meet the following conditions that a+b+c is equal to 100%, a is larger than or equal to 50% mol and smaller than or equal to 60% mol, b is larger than or equal to 20% mol andsmaller than or equal to 30% mol and smaller than 10% mol. The microwave dielectric ceramic material with the low dielectric constant, provided by the invention, can keep Er=4.0-6.0, Qf>15000 and anadjustable temperature coefficient tau f<+/-30ppm/DEG C under the condition of medium-temperature sintering, and the powder does not contain toxic elements such as lead, cadmium and arsenic. Raw materials and process cost are low, and the technical requirements in the fields of microwave mobile communication, satellite communication, radar systems and the like can be met.

Description

technical field [0001] The invention relates to the technical field of electronic information materials, in particular to a low dielectric constant microwave dielectric ceramic material and a preparation method thereof. Background technique [0002] The development of modern communication, positioning and navigation technologies, especially the promotion of the Beidou global positioning system independently completed by China, has greatly promoted the development of military-civilian dual-use positioning and navigation industries. The process of electronic components developing in the direction of miniaturization, chip type and high frequency. Microwave ceramic devices are also developing in the direction of chip, miniaturization and even integration. Typical application fields include: military and civilian space technology, radar, mobile communication, satellite communication and gps, etc. Usually low and medium dielectric constant microwave dielectric ceramic materials ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/20C04B35/622C04B35/626
CPCC04B35/20C04B35/622C04B35/6261C04B2235/3454C04B2235/3481
Inventor 吉岸王晓慧金镇龙
Owner 无锡鑫圣慧龙纳米陶瓷技术有限公司
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