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A kind of microwave dielectric ceramic material and preparation method thereof

A technology of microwave dielectric ceramics and ceramic blanks, applied in ceramics, inorganic insulators, etc., can solve the problems of Q*f value reduction, poor ceramic sintering stability, and εr value increase, etc., to achieve high Q*f value and good sintering Effect of stability and low dielectric constant

Active Publication Date: 2021-01-29
GUANGDONG GOVA ADVANCED MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It can be seen from this that although τ in the above system f The value can be adjusted close to zero, but there is a significant decrease in the Q*f value or ε r The value of the problem rises significantly, meanwhile, the Mg 2 SiO 4 Poor sintering stability of ceramics

Method used

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preparation example Construction

[0070] The present invention also provides a method for preparing the microwave dielectric ceramic material described in the above technical solution, comprising the following steps:

[0071] a) MgO, ZnO and SiO 2 After mixing, the first grinding treatment is carried out, and the compound Mg is obtained after calcination 1.2 Zn 0.8 SiO 4 ;

[0072] b) MgO, ZnO and Al 2 o 3 After mixing, the second grinding treatment is carried out, and the compound Mg is obtained after calcination 0.65 Zn 0.35 al 2 o 4 ;

[0073] c) the above Mg 1.2 Zn 0.8 SiO 4 and Mg 0.65 Zn 0.35 al 2 o 4 Mixing according to the molar ratio of x:y, adding additives, performing the third grinding treatment, granulation treatment and pressing molding in sequence to obtain a ceramic green body; wherein, x+y=1, 0.4≤x≤0.9, 0.1≤y≤ 0.6;

[0074] d) Sintering the ceramic body obtained in step c) to obtain a microwave dielectric ceramic material;

[0075] The steps a) and b) are not limited in sequ...

Embodiment 1

[0133] (1) Weigh MgO, ZnO and SiO respectively according to weight percentage 27.87%: 37.51%: 34.62% 2 and mixed, adding pure water as the ball milling medium, ball milling for 10 hours, drying through a 100-mesh sieve, and calcining at 1200°C for 4 hours to obtain compound A: Mg 1.2 Zn 0.8 SiO 4 ;

[0134] Weigh MgO, ZnO and Al according to weight percentage 10.13%: 11.02%: 78.85% 2 o 3 and mixed, adding pure water as the ball milling medium, ball milling for 12 hours, drying through a 100-mesh sieve, and calcining at 1300°C for 3 hours to obtain compound B: Mg 0.65 Zn 0.35 Al 2 o 4 ;

[0135] According to the mass percentage of 55%: 13%: 32%, respectively weigh MgO, B 2 o 3 and SiO 2 And mix, add ethanol as the ball milling medium, after planetary ball milling for 24 hours, put it into a freeze dryer to dry for 36 hours, pass through a 300-mesh screen, put it into a quartz crucible and melt it at 1500°C for 0.5 hours, and quickly pass it through a cold rolling mil...

Embodiment 2

[0141] (1) Weigh MgO, ZnO and SiO respectively according to weight percentage 27.87%: 37.51%: 34.62% 2 and mixed, adding pure water as the ball milling medium, ball milling for 9 hours, drying through a 100-mesh sieve, and calcining at 1250°C for 3 hours to obtain compound A: Mg 1.2 Zn 0.8 SiO 4 ;

[0142] Weigh MgO, ZnO and Al according to weight percentage 10.13%: 11.02%: 78.85% 2 o 3 and mixed, adding pure water as the ball milling medium, ball milling for 12 hours, drying through a 100-mesh sieve, and calcining at 1300°C for 3 hours to obtain compound B: Mg 0.65 Zn 0.35 Al 2 o 4 ;

[0143] According to the mass percentage of 55%: 13%: 32%, respectively weigh MgO, B 2 o 3 and SiO 2 And mix, add ethanol as the ball milling medium, after planetary ball milling for 24 hours, put it into a freeze dryer to dry for 36 hours, pass through a 300-mesh screen, put it into a quartz crucible and melt it at 1500°C for 0.5 hours, and quickly pass it through a cold rolling mill...

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Abstract

The invention provides a microwave dielectric ceramic material, which is prepared from composite oxides and additives; the general formula of the composite oxides is xMg 1.2 Zn 0.8 SiO 4 -yMg 0.65 Zn 0.35 al 2 o 4 ; Wherein, x+y=1, 0.4≤x≤0.9, 0.1≤y≤0.6. Compared with the prior art, the microwave dielectric ceramic material provided by the present invention is prepared from a composite oxide of a specific general formula and additives, and realizes the microwave dielectric ceramic material Mg 2 SiO 4 Effective improvement; the microwave dielectric ceramic material also has a low dielectric constant, a very high Q*f value and good sintering stability, and can realize continuous adjustment of temperature drift to meet various needs. The experimental results show that the relative permittivity ε of the microwave dielectric ceramic material provided by the invention r It is 7~8, the quality factor Q*f value is ≥180000GHz, the temperature drift adjustment range is -10~+6ppm / ℃, and the sintering is stable, which has very excellent application value and market potential.

Description

technical field [0001] The invention relates to the technical field of functional ceramic materials, and more specifically relates to a microwave dielectric ceramic material and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics refer to ceramic materials that are used as dielectric materials in microwave frequency circuits and perform one or more functions. As the operating frequency of communication equipment further expands to the high-frequency range, especially after entering the millimeter wave band, the size of communication devices becomes smaller and smaller, reaching the millimeter level. Therefore, the key issue of electronic components is no longer miniaturization. However, as the frequency increases, the dielectric loss of the material increases significantly, the signal transmission delay time is longer, and the problem of signal attenuation is prominent. These two issues are related to dielectric constant and dielectric ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B3/12C04B35/453C04B35/622C04B35/626C04B35/64
CPCC04B35/453C04B35/622C04B35/62605C04B35/62695C04B35/64C04B2235/3206C04B2235/3217C04B2235/3418C04B2235/6567H01B3/12
Inventor 刘超周星星吴悦广
Owner GUANGDONG GOVA ADVANCED MATERIAL TECH
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