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A temperature-stable low dielectric constant microwave dielectric ceramic and its preparation method

A technology of microwave dielectric ceramics and low dielectric constant is applied in the field of electronic ceramics and its preparation, which can solve the problems such as failure to obtain and achieve the effects of preparing raw materials that are non-toxic, low in price, and good in temperature stability.

Active Publication Date: 2022-08-02
无锡鑫圣慧龙纳米陶瓷技术有限公司
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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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  • A temperature-stable low dielectric constant microwave dielectric ceramic and its preparation method

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[0022] The invention also provides a preparation method of a temperature-stable low dielectric constant microwave dielectric ceramic, comprising the following steps:

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

[0024] (2) the powder base material obtained in step (1) is fully ball-milled, and then dried, granulated and sieved;

[0025] (3) Pressing and...

Embodiment 1

[0033] The temperature-stable low-dielectric-constant microwave dielectric ceramic of Example 1 has the composition expression 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 the embodiment 1 comprises the following steps:

[0035] (1) Weigh MgO and SiO respectively according to the molar percentage of each element in the composition expression 2 , SrCO 3 , TiO2 , the weighed materials are fully mixed and then ball-milled, dried and sieved after ball-milling, and then placed in a corundum crucible and pre-fired at 1100 ° C for 3 hours to obtain a powder base material;

[0036] (2) fully ball-milling the powder base material obtained in step (1), then drying, granulating and sieving; wherein the granulation is to mix the dried powder with polyvinyl alcohol solution, and then make into micron-sized spherical particles;...

Embodiment 2

[0040] The temperature-stable low-dielectric-constant microwave dielectric ceramic of Example 2 has the composition expression 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 molar percentage of each element in the composition expression 2 , SrCO 3 , TiO 2 , the weighed materials are fully mixed and then ball-milled, dried and sieved after ball-milling, and then placed in a corundum crucible and pre-fired at 1100 ° C for 3 hours to obtain a powder base material;

[0043] (2) fully ball-milling the powder base material obtained in step (1), then drying, granulating and sieving; wherein the granulation is to mix the dried powder with polyvinyl alcohol solution, and then make into micron-sized spherical particl...

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Abstract

The invention discloses a temperature-stable low dielectric constant microwave dielectric ceramic whose composition expression is 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%. The invention also discloses a preparation method of a temperature-stable low dielectric constant microwave dielectric ceramic. The microwave dielectric ceramic has excellent microwave dielectric properties, low sintering temperature, high quality factor and near-zero adjustable frequency temperature coefficient, good temperature stability, non-toxic preparation materials, low price, and preparation technology. Simple.

Description

technical field [0001] The invention belongs to the technical field of electronic ceramics and preparation thereof, 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 materials, which can perform one or more functions as dielectric materials in microwave frequency circuits. Microwave dielectric properties are the decisive factor for the application of microwave dielectric ceramics, while 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 important components in communication equipment, microwave components, especially filters and resonators, have received e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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