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Microwave dielectric ceramic material, preparation method thereof and electronic device

A technology of microwave dielectric ceramics and ceramics, applied in the field of ceramic materials, can solve the problems of unsatisfactory, sintering time as long as 48h, etc.

Pending Publication Date: 2021-04-27
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 2007, Chi-Yuen et al. reported the effect of firing powder under different firing conditions on the microwave dielectric properties of ceramics. The results showed that the ceramics obtained after two-step firing powder and then sintering at 1350°C for 48 hours had a relative relative strength of 95%. Density and optimal microwave performance: Qf=236753GHz (~6GHz), ε r =39.7,τ f =15ppm / °C, but the sintering time is as long as 48h, and there is Ba in the sample 5 Nb 4 o 15 second phase
However, the sintering temperature of the above research work is greater than 1300°C, which cannot meet the requirements of the current low temperature co-fired ceramic (LTCC, Low Temperature Co-fired Ceramic) passive integration technology

Method used

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  • Microwave dielectric ceramic material, preparation method thereof and electronic device
  • Microwave dielectric ceramic material, preparation method thereof and electronic device
  • Microwave dielectric ceramic material, preparation method thereof and electronic device

Examples

Experimental program
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Effect test

Embodiment 1

[0037] This embodiment adopts 0.8LiF-0.2CaF 2 (abbreviated as L 8 C 2 ) is a composite fluoride sintering aid, which is prepared according to the following steps: according to the required L 8 C 2 LiNO required for mass calculation 3 , Ca(NO 3 ) 2 and accurately weigh it, dissolve it in deionized water to prepare a 0.5mol / L salt solution, and take NH 4 F is dissolved in deionized water to obtain 1.0mol / L NH 4 F solution, drop salt solution into NH 4 The mixed reaction is carried out in the F solution, the mixed suspension is dried at 100°C to obtain a solid mixture, and then the solid mixture is calcined at 300°C in a nitrogen atmosphere to obtain a composite fluoride sintering aid.

[0038] image 3 The SEM image of the composite fluoride sintering aid prepared in this embodiment is shown, and it can be seen from the figure that the particles of the sintering aid are in nanoscale size.

[0039] With the composite fluoride L prepared above 8 C 2 As a sintering aid,...

Embodiment 2

[0045] This embodiment provides a microwave dielectric ceramic material, and the sintering aid used in the preparation process is the L prepared in Example 1. 8 C 2 The composite fluoride sintering aid is specifically prepared according to the following steps:

[0046] S1, BZN main material and compound fluoride sintering aid L 8 C 2 Accurately weighed according to the formula, wherein the mass percentage of BZN main material is 95wt.%, L 8 C 2 The mass percentage is 5wt.%.

[0047] S2. Put the raw material weighed in step S1 into a ball mill tank for ball milling, wherein the mass ratio of raw material powder: dispersant: ball milling medium = 1:2:7, the dispersant is absolute ethanol, and the ball milling medium is zirconia Balls were ball milled for 8 hours at 300-500 rpm on a planetary ball mill.

[0048] S3. Dry the slurry obtained by ball milling in step S2 at 75° C., grind and pass through a 200-mesh sieve to obtain the required powder.

[0049] S4. Dry press the...

Embodiment 3

[0051] This embodiment uses 0.8LiF-0.2BaF 2 (abbreviated as L 8 B 2 ) is a composite fluoride sintering aid, which is prepared according to the following steps: similar to Example 1, weigh LiNO 3 and BaCl 2 Dissolve in deionized water to form a salt solution with a cation concentration of 0.5mol / L, and take NH 4 F is dissolved in deionized water to obtain 1.0mol / L NH 4 F solution, drop salt solution into NH 4 The mixed reaction is carried out in the F solution, the mixed suspension is dried at 100°C to obtain a solid mixture, and then the solid mixture is calcined at 250°C in a nitrogen atmosphere to obtain a composite fluoride sintering aid.

[0052] With the composite fluoride L prepared above 8 B 2 As a sintering aid, the microwave dielectric ceramic material is prepared according to the following steps:

[0053] S1, BZN main material and compound fluoride sintering aid L 8 B 2 Accurately weighed according to the formula, wherein the mass percentage of BZN main ma...

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Abstract

The invention discloses a microwave dielectric ceramic material and a preparation method thereof, and an electronic device, the microwave dielectric ceramic material is prepared by sintering a raw material comprising a ceramic main crystal phase and a sintering aid, the sintering aid is a composite fluoride, the composite fluoride is selected from at least two of LF, MF2, ReF3 and NF4, L is an alkali metal element, M is a divalent metal element, Re is a rare earth metal element, Al, Ga or Bi, and N are valence metal elements. According to the invention, the composite fluoride with a low melting point is used as a sintering aid, and the microwave dielectric ceramic material with excellent microwave properties such as continuously adjustable medium dielectric constant, low dielectric loss and the like can be prepared by sintering at a lower temperature.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a microwave dielectric ceramic material, a preparation method thereof and an electronic device. Background technique [0002] With the development of electronic information technology, the requirements of high frequency, integration, high reliability and low delay have been put forward for microwave communication technology, so the indispensable microwave devices used in it include resonators, filters Materials such as substrates and antennas pose higher challenges. In particular, the continuous upgrading of mobile communication technology in the 5G and 6G era has put forward a strong demand for low loss, low delay and miniaturization of mobile communication equipment. As an indispensable microwave dielectric ceramic in mobile communication equipment, it plays an irreplaceable function in the 5G and 6G communication era. New microwave dielectric ceramic materials with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622C04B35/64
CPCC04B35/495C04B35/622C04B35/64C04B2235/3215C04B2235/3284C04B2235/60C04B2235/6567C04B2235/6583
Inventor 汪宏陈先强
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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