Low-dielectric microwave dielectric ceramic material and temperature-frequency characteristic regulation and control method thereof

A technology of microwave dielectric ceramics and low dielectric, applied in the field of microwave dielectric ceramics, can solve the problems of variable price of Ti-based materials, increase of dielectric constant, decrease of quality factor, etc., achieve stable low dielectric constant, improve quality factor, phase The effect of a single ingredient

A technology of microwave dielectric ceramics and low dielectric, applied in the field of microwave dielectric ceramics, can solve the problems of variable price of Ti-based materials, increase of dielectric constant, decrease of quality factor, etc., achieve stable low dielectric constant, improve quality factor, phase The effect of a single ingredient

CN112299837AInactive Publication Date: 2021-02-02HUAZHONG UNIV OF SCI & TECH
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  • Low-dielectric microwave dielectric ceramic material and temperature-frequency characteristic regulation and control method thereof
  • Low-dielectric microwave dielectric ceramic material and temperature-frequency characteristic regulation and control method thereof
  • Low-dielectric microwave dielectric ceramic material and temperature-frequency characteristic regulation and control method thereof

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preparation example Construction

[0029] The preparation method of the above-mentioned microwave dielectric ceramic may comprise the following steps:

[0030] (1) According to the chemical expression, it is CaO-SnO 2 -xSiO 2 -yGeO 2 The stoichiometric ratio of CaCO 3 , SnO 2 、GeO 2 and SiO 2 , weighed, wet ball milled, dried after ball milled, and then pre-fired to obtain pre-fired ceramic powder;

[0031] (2) The pre-fired ceramic powder obtained in the step (1) is subjected to secondary wet ball milling, after drying, adding a binder to granulate, and then sintering after tableting to obtain the microwave dielectric ceramic.

[0032] Preferably, the pre-burning temperature in step (1) may be 1100-1150° C., and the pre-burning time is 5-10 hours (eg, 10 hours at 1150° C., etc.).

[0033] Preferably, the binder in step (2) is PVA or paraffin, and the mass fraction of the binder can be 5%-10%.

[0034] Preferably, the sintering temperature in step (2) is 1450°C to 1500°C, and the sintering time is 5 hou...

Embodiment 1～11

[0038] A microwave dielectric ceramic, its preparation method is carried out according to the following steps:

[0039] (1) Analytical pure CaCO 3 , SiO 2 and SnO with a purity not lower than 99.9% 2 and GeO 2 After mixing according to the stoichiometric ratio, use zirconium balls as the ball milling medium and deionized water as the dispersant, and use a ball mill to mix and stir the powder for 5 hours at a speed of 360r / min; dry the obtained slurry at 1150°C Pre-fired for 5 hours to obtain a pre-fired ceramic powder;

[0040] (2) The pre-fired ceramic powder obtained in step (1) is subjected to wet ball milling again, the dispersant is deionized water, and after drying, 8 wt% polyvinyl alcohol (PVA) binder is added to the dried powder Granulate, and press it into a cylindrical green sample with a thickness to diameter ratio of 0.4 to 0.6 under a pressure of 150 MPa; Dielectric ceramic.

[0041] Table 1 Examples 1-11, sintering temperature and microwave dielectric prope...

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Abstract

The invention belongs to the technical field of microwave dielectric ceramics, and discloses a low-dielectric microwave dielectric ceramic material and a temperature-frequency characteristic regulation and control method thereof. The chemical general formula of a main crystalline phase of the low-dielectric microwave dielectric ceramic material is CaO-SnO2-xSiO2-yGeO2, x is larger than or equal to0 and smaller than or equal to 1.0, y is larger than or equal to 0 and smaller than or equal to 1.0, and the main crystalline phase is a maleite phase; the microwave dielectric ceramic material is alow-dielectric microwave dielectric ceramic material, and the relative dielectric constant epsilon r is 10.37-11.7. By regulating the molar ratio 1:1:x:y of Ca:Sn:Si:Ge, the microwave dielectric ceramic material can be obtained correspondingly, l with a relative dielectric constant as low as 10.37-11.7 and the self-adjustable resonant frequency temperature coefficient tau f is acquired under the condition of avoiding the use of Ti element, thereby effectively widening the selection range of the low-dielectric-constant microwave dielectric ceramic material. Moreover, the resonance frequency temperature coefficient tau f of the microwave dielectric ceramic material can be regulated and controlled by regulating and controlling the ratio of SiO2 to GeO2 and utilizing ion substitution.

Description

technical field [0001] The invention belongs to the technical field of microwave dielectric ceramics, and more specifically relates to a low-dielectric microwave dielectric ceramic material and a method for regulating its temperature-frequency characteristics. Background technique [0002] Microwave dielectric ceramics refer to ceramic materials used as dielectrics in microwave frequency band (300MHz-300GHz) circuits. With the advent of the 5G era and the continuous increase in the operating frequency of communication equipment, the signal delay phenomenon will become more obvious, the system loss and heat generation will also increase, and the system stability will gradually deteriorate. The low dielectric constant can reduce the interaction coupling loss between the material and the electrode, and can increase the transmission rate of the electrical signal. The high quality factor can effectively improve the frequency selection characteristics and reduce the loss. The near...

Claims

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Application Information

Patent Timeline
02 Feb 2021
Publication
CN112299837A
IPC
C04B35/457; C04B35/622
CPC
C04B35/457; C04B35/622; C04B2235/3208; C04B2235/3287; C04B2235/3418; C04B2235/442; C04B2235/6565; C04B2235/6567
Inventors
雷文; 杜康