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Temperature-stable low-dielectric-constant microwave dielectric ceramic and preparation method thereof

A technology of microwave dielectric ceramics and low dielectric constant is applied in the field of electronic ceramics and its preparation, which can solve problems such as failure to obtain and achieve the effects of non-toxic preparation raw materials, simple preparation process and high Q value

Active Publication Date: 2021-02-09
无锡鑫圣慧龙纳米陶瓷技术有限公司
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  • Claims
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Problems solved by technology

[0004] At present, in the low dielectric constant microwave dielectric material system, there are many studies on magnesium-titanium and magnesium-silicon systems, but because magnesium-titanium and magnesium-silicon systems have a large negative temperature coefficient, they have not been studied. A product with a very good temperature coefficient and at the same time a very high Q value can be obtained

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  • Temperature-stable low-dielectric-constant microwave dielectric ceramic and preparation method thereof

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[0022] The present invention also provides a method for preparing a temperature-stable low-permittivity microwave dielectric ceramic, comprising the following steps:

[0023] (1) According to the composition expression aMgSiO 3 -bMgTiO 3 -cSrSiO 3 -dSrTiO 3 Weigh the mole percentage of each element in MgO and SiO respectively 2 , SrCO 3 、TiO 2 , the weighed material is mixed fully and then ball milled, dried and sieved after ball milling, and then put into a corundum crucible for heat preservation and pre-fired to obtain a powder base material; wherein, in the composition expression aMgSiO 3 -bMgTiO 3 -cSrSiO 3 -dSrTiO 3 where, a, b, c and d independently represent mole percentages, and satisfy the following conditions: 20mol%≤a≤30mol%, 53mol%≤b≤63mol%, 12mol%≤c≤22mol%, 5mol%≤d≤15mol% %, a+b+c+d=100mol%;

[0024] (2) fully ball-milling the powder base material obtained in step (1), then drying, granulating and sieving;

[0025] (3) Pressing the mixed powder processe...

Embodiment 1

[0033] The temperature-stable low-permittivity microwave dielectric ceramic of this embodiment 1 has a composition expression of aMgSiO 3 -bMgTiO 3 -cSrSiO 3 -dSrTiO 3 Among them, a=20mol%, b=53mol%, c=12mol%, d=15mol%.

[0034] The preparation method of the temperature-stable low dielectric constant microwave dielectric ceramic of this embodiment 1 comprises the following steps:

[0035] (1) Weigh MgO and SiO respectively according to the mole percentage of each element in the composition expression 2 , SrCO 3 、TiO2 , mixing the weighed materials fully, ball milling, drying and sieving after ball milling, and then putting them into a corundum crucible and pre-burning at 1100°C for 3 hours to obtain a powder base material;

[0036] (2) The powder base material obtained in step (1) is fully ball-milled, then dried, granulated and sieved; wherein the granulated is mixed with the dried powder and polyvinyl alcohol solution, and then prepared into micron-sized spherical part...

Embodiment 2

[0040] The temperature-stable low-permittivity microwave dielectric ceramic of this embodiment 2 has a composition expression of aMgSiO 3 -bMgTiO 3 -cSrSiO 3 -dSrTiO 3 Among them, a=20mol%, b=53mol%, c=17mol%, d=10mol%.

[0041] The preparation method of the temperature-stable low dielectric constant microwave dielectric ceramic of this embodiment 2 comprises the following steps:

[0042] (1) Weigh MgO and SiO respectively according to the mole percentage of each element in the composition expression 2 , SrCO 3 、TiO 2 , mixing the weighed materials fully, ball milling, drying and sieving after ball milling, and then putting them into a corundum crucible and pre-burning at 1100°C for 3 hours to obtain a powder base material;

[0043] (2) The powder base material obtained in step (1) is fully ball-milled, then dried, granulated and sieved; wherein the granulated is mixed with the dried powder and polyvinyl alcohol solution, and then prepared into micron-sized spherical pa...

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Abstract

The invention discloses a temperature-stable low-dielectric-constant microwave dielectric ceramic, which has a composition expression of aMgSiO3-bMgTiO3-cSrSiO3-dSrTiO3, in which a, b, c and d independently represent molar percentages, and satisfy the following conditions: a is greater than or equal to 20mol% and less than or equal to 30mol%, b is greater than or equal to 53mol% and less than or equal to 63mol%;c is greater than or equal to 12mol% and less than or equal to 22mol%;d is greater than or equal to 5mol% and less than or equal to 15mol%; and a+b+c+d=100 mol%. The invention also discloses a preparation method of the temperature-stable low-dielectric-constant microwave dielectric ceramic. The microwave dielectric ceramic has the advantages of excellent microwave dielectric properties, low sintering temperature, high quality factor, near-zero adjustable frequency temperature coefficient, good temperature stability, nontoxic preparation raw materials, low price and simple preparation process.

Description

technical field [0001] The invention belongs to the technical field of electronic ceramics and its preparation, and in particular relates to a preparation method of a temperature-stable low dielectric constant microwave dielectric ceramic. Background technique [0002] With the development in recent decades, microwave dielectric ceramics have become a new type of functional ceramic material, which can perform one or more functions as a dielectric material in microwave frequency circuits. The microwave dielectric properties are the decisive factors for the application of microwave dielectric ceramics, and the relative permittivity ε r , Quality factor Q×f and resonant frequency temperature coefficient τf are the three main parameters of microwave dielectric properties. [0003] With the rapid development of the 5G mobile communication system industry, as an important device in communication equipment, microwave components, especially filters and resonators, have attracted ex...

Claims

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Application Information

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IPC IPC(8): C04B35/465C04B35/622
CPCC04B35/465C04B35/622C04B2235/3445C04B2235/3436C04B2235/3236C04B2235/3206C04B2235/3418C04B2235/3232C04B2235/442
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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