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Rutile-like-structured microwave dielectric ceramics for resonator

A technology of microwave dielectric ceramics and rutile, which is applied in the field of ceramic compositions, can solve the problems of high sintering temperature and large loss of Qf value, etc., and achieve the effects of simple preparation process, saving energy cost and wide application prospect

Inactive Publication Date: 2020-02-18
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to use microwave dielectric materials such as BaO-TiO for traditional resonators 2 and (Zr,Sn)TiO 4 series materials, there are problems such as high sintering temperature, large loss of dielectric constant Qf value, and most of them contain noble metal Ta. To provide a ZnO, TiO 2 、GeO 2 , Nb 2 o 5 As raw materials, a new type of manganese-tantalite-rutile composite structure ZnO-(0.97+x)TiO with good microwave dielectric properties was prepared by using the traditional solid-state method 2 -0.03GeO 2 -Nb 2 o 5 (x=0.6~0.9)Microwave dielectric ceramics

Method used

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  • Rutile-like-structured microwave dielectric ceramics for resonator

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Combine ZnO, TiO 2 、GeO 2 , Nb 2 o 5 According to the stoichiometric formula ZnO-0.97TiO 2 -0.03GeO 2 -Nb 2 o 5 For batching, the powder ratio is: 1.9348g ZnO, 1.8412g TiO 2 , 0.0739g GeO 2 and 6.2550g Nb 2 o 5 . Put about 10g of powder into a polyester tank, add 250ml of deionized water and 150g of zirconium balls, and mill on a planetary ball mill for 6 hours at a speed of 400 rpm;

[0022] 2. Put the ball-milled powder in a drying oven, dry it at 100°C and pass it through a 40-mesh sieve;

[0023] 3. Put the sieved powder into a medium-temperature furnace, pre-fire it at 950°C, keep it warm for 5 hours, and initially synthesize ZnO-0.97TiO 2

[0024] -0.03GeO 2 -Nb 2 o 5 matrix powder;

[0025] 4. Add TiO with a molar ratio of 0.6 to the matrix powder in step 3. 2 , while adding 0.8wt% polyvinyl alcohol as a binder for mixing, put it into a ball mill tank, add zirconia balls and deionized water, ball mill for 12 hours, pass through an 80-mesh sie...

Embodiment 2

[0029] 1. Combine ZnO, TiO 2 、GeO 2 , Nb 2 o 5 According to the stoichiometric formula ZnO-0.97TiO 2 -0.03GeO 2 -Nb 2 o 5 For batching, the powder ratio is: 1.9348g ZnO, 1.8412g TiO 2 , 0.0739g GeO 2 and 6.2550g Nb 2 o 5 . Put about 10g of powder into a polyester tank, add 250ml of deionized water and 150g of zirconium balls, and mill on a planetary ball mill for 8 hours at a speed of 400 rpm;

[0030] 2. Put the ball-milled powder in a drying oven, dry it at 100°C and pass it through a 40-mesh sieve;

[0031] 3. Put the sieved powder into a medium-temperature furnace, pre-fire it at 950°C, keep it warm for 8 hours, and initially synthesize ZnO-0.97TiO 2 -0.03GeO 2 -Nb 2 o 5 matrix powder;

[0032] 4. Add TiO with a molar ratio of 0.65 to the matrix powder into the matrix powder after pre-burning in step 3 2 , while adding 0.8wt% polyvinyl alcohol as a binder for mixing, put it into a ball mill tank, add zirconia balls and deionized water, ball mill for 12 hou...

Embodiment 3～8

[0036] Embodiments 3-8 are completely the same as Embodiment 1 except for x value and sintering temperature. The main process parameters and microwave dielectric properties of specific embodiments of the present invention are shown in Table 1.

[0037] Table 1

[0038]

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Abstract

The invention discloses rutile-like-structured microwave dielectric ceramics for a resonator. A synthetic has an expression of ZnO-(0.97+x)TiO2-0.03GeO2-Nb2O5, wherein x is equal to 0.6 to 0.9. The rutile-like-structured microwave dielectric ceramics are obtained through firstly, proportioning raw materials according to a stoichiometric equation, carrying out ball milling, baking, screening and preburning, then, preliminarily synthesizing an ixiolite matrix powder material ZnO-0.97TiO2-0.03GeO2-Nb2O5, then, adding TiO2 into the matrix powder material, carrying out granulating and forming, then, sintering a blank at a temperature of 1,090 DEG C to 1,160 DEG C, wherein a mole ratio of TiO2 to the matrix is x, and x is equal to 0.6 to 0.9. According to the rutile-like-structured microwave dielectric ceramics, the dielectric constant [epsilon]r is 39.2 to 46.3, the factor of quality Qf value is 31,030GHz to 50,800GHz, and the temperature coefficient of resonance frequency [tau]f is -36.5ppm / DEG C to +17.0ppm / DEG C. The preparation process is simple, the raw materials are cheap, medium-temperature sintering is employed, and the application prospect is broad.

Description

technical field [0001] The invention belongs to a ceramic composition characterized by components, in particular to a ZnO-(0.97+x)TiO 2 -0.03GeO 2 -Nb 2 o 5 A composite microwave dielectric ceramic material with a chemical formula of medium temperature sintering and good microwave dielectric properties and a preparation method thereof. Background technique [0002] As mobile communication technology enters the 5G era, miniaturization, high frequency, and high performance have become the development trend of mobile communication equipment and portable terminals. The corresponding microwave circuits should have the characteristics of high integration, low power consumption, and high stability. . As an important part of microwave circuits, the size, power consumption and stability of microwave dielectric devices directly affect the integration and performance of the circuit. How to realize the requirements of small size, low power consumption and high stability of devices h...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622
CPCC04B35/495C04B35/622C04B2235/3232C04B2235/3284C04B2235/3287C04B2235/5427C04B2235/602C04B2235/656C04B2235/6567
Inventor 李玲霞王顺罗伟嘉
Owner TIANJIN UNIV
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