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Microwave dielectric material with near-zero temperature coefficient of resonance frequency

A microwave dielectric material and temperature coefficient technology, applied in the field of ceramic compositions, can solve the problems of limited development and low Qf value, and achieve the effects of reducing residual stress, high Qf value, and high dielectric constant

Inactive Publication Date: 2020-01-10
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] (Zr 1-x Ti x ) 1-y (Zn 1 / 3 Nb 2 / 3 ) y o 2 The microwave dielectric ceramics are manganese-tantalite-rutile two-phase composite structure. This system has a high dielectric constant (40-50), a near-zero temperature coefficient and a moderate sintering temperature (1200 ° C). However, the material system is due to The existence of residual stress between the two phases leads to a low Qf value, which limits the further development of the system

Method used

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  • Microwave dielectric material with near-zero temperature coefficient of resonance frequency

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Embodiment 1

[0019] The present invention uses TiO with a purity greater than 99% 2 (analytical pure), ZnO (analytical pure), Nb 2 o 5 (analytical pure), ZrO 2 (analytical pure) as the initial raw material, the microwave dielectric material was prepared by the solid phase method. The specific implementation steps are as follows:

[0020] (1) TiO 2 , ZnO, Nb 2 o 5 , ZrO 2 According to the stoichiometric formula (Zr 0.4 Ti 0.6 ) 0.8 (Zn 1 / 3 Nb 2 / 3 ) 0.2 o 2 For batching, the powder ratio is: 7.8862gZrO 2 , 3.5086gNb 2 o 5 , 7.6672gTiO 2 , 1.1072gZnO 2 . Put the powder into a polyester tank, add 200ml of deionized water and 150g of zirconium balls, and mill for 6 hours at a speed of 400 rpm;

[0021] (2) putting the raw material after ball milling in step (1) into a drying oven and drying at 100° C., and then passing through a 40-mesh sieve;

[0022] (3) Put the dried and sieved powder in step (2) into a medium-temperature furnace, pre-fire at 1050°C, keep it warm for 4 h...

Embodiment 2

[0028] The present invention uses TiO with a purity greater than 99% 2 (analytical pure), ZnO (analytical pure), Nb 2 o 5 (analytical pure), ZrO2 (analytical pure) as the initial raw materials, microwave dielectric materials were prepared by solid-phase method. The specific implementation steps are as follows:

[0029] (1) TiO 2 , ZnO, Nb 2 o 5 , ZrO 2 According to the stoichiometric formula (Zr 0.4 Ti 0.6 ) 0.8 (Zn 1 / 3 Nb 2 / 3 ) 0.2 o 2 For batching, the powder ratio is: 6.9004gZrO 2 , 3.5086gNb 2 o 5 , 8.3060gTiO 2 , 1.1072gZnO 2 . Put the powder into a polyester tank, add 200ml of deionized water and 150g of zirconium balls, and mill for 6 hours at a speed of 400 rpm;

[0030] (2) putting the raw material after ball milling in step (1) into a drying oven and drying at 100° C., and then passing through a 40-mesh sieve;

[0031] (3) Put the dried and sieved powder in step (2) into a medium-temperature furnace, pre-fire at 1050°C, keep it warm for 4 hours, a...

Embodiment 3～9

[0037] Examples 3-9 except for the value ranges of x and y, other process parameters are completely the same as the above-mentioned examples, and the main parameters and microwave dielectric properties of specific examples are shown in Table 1.

[0038] Table 1

[0039]

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Abstract

The invention discloses a microwave dielectric material with a near-zero temperature coefficient of resonance frequency. TiO2, ZnO, Nb2O5 and ZrO2 are adopted as the raw materials, the expression of atarget synthetic compound is (Zr1-xTix)1-y(Zn1 / 3Nb2 / 3)yO2, wherein x=0.6-0.7, and y=0.1-0.3. The preparation method includes: firstly proportioning the raw materials according to a stoichiometric equation, carrying out ball milling, drying and sieving, performing presintering at 1050DEG C, then carrying out ball milling and drying, conducting granulation, and then performing pressing into a greenbody; and heating the green body to 1250DEG C at a rate of 5DEG C / min, carrying out heat preservation for 30min, then performing cooling to 1150DEG C at a rate of 10DEG C / min, conducting heat preservation for 12h, and then performing cooling to obtain the microwave dielectric material with a near-zero temperature coefficient of resonance frequency. The invention adopts two-stage sintering, firstly the green body is heated to a high temperature and is subjected to heat preservation for a short period of time, and then heat preservation is carried out at a low temperature for a long time, so that the ceramic reaches high density, meanwhile, the residual stress between two phases is reduced, and the defect of low Qf value of a two-phase composite microwave dielectric ceramic material is effectively improved.

Description

technical field [0001] The invention belongs to a ceramic composition characterized by composition, in particular to a kind of ceramic composition (Zr 1-x Ti x ) 1-y (Zn 1 / 3 Nb 2 / 3 ) y o 2 , wherein x=0.6-0.7, y=0.1-0.3 are microwave dielectric ceramics and a preparation method thereof. Background technique [0002] Microwave technology is one of the major achievements of modern scientific development. Because microwave has the advantages of short wavelength and high frequency, it has good frequency selection characteristics and is widely used in mobile communication, satellite communication, military radar, global satellite positioning system (GPS), Bluetooth technology, wireless local area network and other fields. The development of microwave communication technology puts forward new requirements for the performance (sensitivity, signal-to-noise ratio, coverage, communication capacity, etc.) and size of microwave devices. Driven by this technical background, there...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/49C04B35/46C04B35/622C04B35/64
CPCC04B35/46C04B35/49C04B35/622C04B35/64C04B2235/3232C04B2235/3244C04B2235/3251C04B2235/3284C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/661
Inventor 李玲霞乔坚栗杜明昆罗伟嘉彭伟
Owner TIANJIN UNIV
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