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A kind of composite microwave dielectric ceramic and preparation method thereof

A technology of microwave dielectric ceramics and adhesives, which is applied in the direction of ceramics and inorganic insulators, can solve the problems of low reliability and achieve the effects of meeting environmental protection requirements, simple preparation methods, and low dielectric loss

Active Publication Date: 2022-03-22
GUANGDONG GOVA ADVANCED MATERIAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this stage, there are many schemes with a dielectric constant above 20, but there are few studies on a dielectric constant between 10-20. The general scheme is MgAl 2 o 4 or ZnAl 2 o 4 with TiO 2 Composite, but due to the problem of titanium reduction under high temperature sintering, the reliability of this scheme is not high

Method used

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  • A kind of composite microwave dielectric ceramic and preparation method thereof
  • A kind of composite microwave dielectric ceramic and preparation method thereof

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preparation example Construction

[0045] The present invention also provides a method for preparing the composite microwave dielectric ceramic described in the above technical solution, comprising the following steps:

[0046] a) According to the chemical formula Mg x Zn y Al 2 o 4 MgO, Al 2 o 3 After mixing with ZnO, the first grinding treatment is carried out to obtain the MZA raw material; then the MZA raw material is calcined for the first time to obtain the MZA calcined material;

[0047] b) According to the chemical formula Sr 2 TiO 4 SrCO 3 and TiO 2 After mixing, carry out the second grinding treatment to obtain the ST raw material; then carry out the second calcining of the ST raw material to obtain the ST calcined material;

[0048] c) After mixing the above-mentioned MZA calcined material and ST calcined material, perform the third grinding treatment to obtain MZA-ST powder;

[0049] d) adding a binder to the MZA-ST powder obtained in step c) for granulation and molding to obtain the MZA-S...

Embodiment 1～11

[0088] (1) According to the chemical formula Mg x Zn y Al 2 o 4 MgO, Al 2 o 3 After mixing with ZnO, mix the mixed raw materials, water, and zirconium balls at a mass ratio of 1:2:2, ball mill at a speed of 250r / min for 8 hours, and then dry at 120°C to obtain MZA raw materials; The MZA raw material is heated up to the pre-burning temperature at a heating rate of 3°C / min for the first pre-burning for a certain pre-burning time to obtain the MZA pre-fired material;

[0089] At the same time, according to the chemical formula Sr 2 TiO 4 SrCO 3 and TiO 2 After mixing, mix the mixed raw materials, water, and zirconium balls at a mass ratio of 1:2:2, ball mill for 8 hours at a speed of 250r / min, and then dry at 120°C to obtain ST raw materials; The ST raw material is heated up to the pre-burning temperature at a heating rate of 3°C / min for the second pre-burning for a certain pre-burning time to obtain the ST pre-fired material;

[0090] (2) After mixing the above-mention...

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Abstract

The invention provides a composite microwave dielectric ceramic, which has the general formula shown in the following formula: Mg x Zn y al 2 o 4 —zSr 2 TiO 4 ; Wherein, x+y+z=1, z≤0.35. Compared with the prior art, the present invention will have Mg with negative resonant frequency temperature coefficient x Zn y al 2 o 4 Ceramic and Sr with positive resonant frequency temperature coefficient 2 TiO 4 The ceramics are composited, so that the dielectric constant of the composite microwave dielectric ceramics can be adjusted between 8.5 and 18.63, and Q×f>59200GHz can be as high as 97534GHz. Compared with other microwave dielectric ceramics with the same dielectric constant, the Q of this system is The value of ×f is large, and the dielectric loss is low; at the same time, the temperature coefficient of the resonant frequency is continuously adjustable between ‑77~+39PPM / ℃, the formula can be adjusted flexibly, there is no risk of titanium reduction, high reliability, and suitable for large-scale commercial use.

Description

technical field [0001] The invention relates to the technical field of microwave dielectric ceramics, and more specifically relates to a composite microwave dielectric ceramic and a preparation method thereof. Background technique [0002] With the advent of the 5G era, in order to meet people's needs for ultra-high traffic density, ultra-high connection density, and ultra-high mobility, it is necessary to use Massive MIMO technology to achieve large-scale integration, miniaturization, and light weight of antennas and filters. Under the premise of satisfying performance, ceramic dielectric waveguide filter has become one of the main options for main equipment manufacturers due to its advantages of light weight, good frequency and temperature performance, and miniaturization. [0003] However, different operators in various countries around the world use different frequency bands to build 5G, and microwave dielectric ceramic solutions with different dielectric constants are r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B3/12C04B35/44
CPCC04B35/44C04B2235/3236C04B2235/3206C04B2235/3251C04B2235/3284C04B2235/3224C04B2235/6562C04B2235/6567C04B2235/96
Inventor 殷旺凌海强赵勇强马才兵
Owner GUANGDONG GOVA ADVANCED MATERIAL TECH
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