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Two-phase composite microwave dielectric ceramic material, and preparation method and application thereof

A technology of microwave dielectric ceramics and mixtures, applied in waveguide devices, resonators, circuits, etc., to achieve the effects of easy mass and stable industrial production, controllable synthesis process, and simple synthesis method

Inactive Publication Date: 2020-05-19
SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

while MgTiO 3 The dielectric constant is 17, which has a high quality factor, but the resonant frequency temperature coefficient τf is about -55ppm / ℃. These two materials have the disadvantage of τf biased or positive biased respectively, and it is difficult to be widely used. The composite material can combine the advantages of the two to obtain a composite material with a high quality factor and a suitable resonant frequency temperature coefficient τf with a dielectric constant between 17 and 40.

Method used

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  • Two-phase composite microwave dielectric ceramic material, and preparation method and application thereof
  • Two-phase composite microwave dielectric ceramic material, and preparation method and application thereof
  • Two-phase composite microwave dielectric ceramic material, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Take BaCO according to the molar ratio 1:(1 / 3):(1 / 3) 3 , ZnO, Nb 2 o 5 Mix the raw materials to obtain a mixture, then add water to the ball mill according to the amount of mixture: water = 1:0.8, and add ammonium acrylate dispersant accounting for 0.4wt% of the mixture, then add the mixture and mix evenly, ball mill 3h; the ball-milled slurry is sand-milled and dispersed by a sand mill; the dispersed material is microwave-dried by a microwave dryer until the water content of the material is 1 / 3 Nb 2 / 3 )O 3 ,spare. The Ba(Zn 1 / 3 Nb 2 / 3 )O 3 See attached XRD chart figure 1 As shown, it can be seen that the product is Ba(Zn 1 / 3 Nb 2 / 3 )O 3 Pure phase and well synthesized.

[0048] Take Mg(OH) according to the stoichiometric ratio of 1:1 2 and TiO 2 Mix the raw materials to obtain a mixture, then add water to the ball mill according to the amount of mixture: water = 1:1, and add ammonium acrylate dispersant accounting for 0.8wt% of the mixture, then add the mi...

Embodiment 2

[0053] Take BaCO according to the stoichiometric ratio 3 , ZnO, Nb 2 o 5 Mix the raw materials to obtain a mixture, then add water to the ball mill according to the amount of mixture: water = 1:0.4, and add ammonium acrylate dispersant accounting for 1.0 wt% of the mixture, then add the mixture and mix evenly, ball mill 3h; the ball-milled slurry is dispersed by sand milling with a sand mill; the dispersed material is microwave-dried using a microwave dryer until the water content of the material is 1 / 3 Nb 2 / 3 )O 3 ,spare.

[0054] Take Mg(OH) according to the stoichiometric ratio 2 and TiO 2 Mix the raw materials to obtain a mixture, then add water to the ball mill according to the amount of mixture: water = 1:0.8, and add ammonium acrylate dispersant accounting for 1.0 wt% of the mixture, then add the mixture and mix evenly, ball mill 3h; the ball-milled slurry is dispersed by sand milling with a sand mill; the dispersed material is microwave-dried using a microwave dr...

Embodiment 3

[0059] Take BaCO according to the stoichiometric ratio 3 , ZnO, Nb 2 o 5 Mix the raw materials to obtain a mixture, then add water to the ball mill according to the amount of mixture: water = 1:0.6, and add ammonium acrylate dispersant accounting for 0.8wt% of the mixture, then add the mixture and mix evenly, ball mill 3h; the ball-milled slurry was dispersed by sand milling with a sand mill; the dispersed material was microwave-dried using a microwave dryer; the dried material was heat-preserved and calcined at 1180°C for 2.5h, and Ba(Zn 1 / 3 Nb 2 / 3 )O 3 ,spare.

[0060] Take Mg(OH) according to the stoichiometric ratio 2 and TiO 2 Mix the raw materials to obtain a mixture, then add water to the ball mill according to the amount of mixture: water = 1:1.2, and add ammonium acrylate dispersant accounting for 0.5 wt% of the mixture, then add the mixture and mix evenly, ball mill 3h; the ball-milled slurry was dispersed by sand milling with a sand mill; the dispersed mate...

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Abstract

The invention belongs to the technical field of microwave dielectric ceramic materials, and particularly relates to a two-phase composite microwave dielectric ceramic material. The two-phase compositemicrowave dielectric ceramic material is prepared from Ba(Zn<1 / 3>Nb<2 / 3>)O<3>, MgTiO<3> and a selectively-added oxide additive through solid-phase synthesis; the obtained microwave dielectric ceramicmaterial can be sintered into ceramic at a sintering temperature of 1320 to 1370 DEG C; the dielectric constant of a test wafer reaches 30-35, the value of f*Q at 25 DEG C is larger than 60000, a frequency temperature coefficient calculated by testing resonant frequencies f at -40 DEG C, 25 DEG C and 110 DEG C is low and ranges from -5 ppm / DEG C to 5 ppm / DEG C, and the performance of the test wafer meets the requirements on microwave dielectric ceramic devices; meanwhile, the material also has relatively good dielectric properties in a millimeter wave frequency band; and the material can be used for producing ceramic devices such as filters and resonators.

Description

technical field [0001] The invention belongs to the technical field of microwave dielectric ceramic materials, specifically relates to a two-phase composite microwave dielectric ceramic material, and further discloses its preparation method and application. Background technique [0002] Microwave dielectric ceramics refer to ceramics that are used as dielectric materials in microwave frequency band (mainly UHF, SHF frequency band, 300MHz-300GHz) circuits and perform one or more functions. They have high dielectric constant, low dielectric loss, low Resonant frequency temperature coefficient and other excellent properties are important components of resonators, filters, duplexers, antennas, frequency stabilized oscillators, waveguide transmission lines and other devices, and can be widely used in personal portable mobile phones, microwave base stations, car phones, Satellite communication, military radar and many other fields. Especially in recent years, with the rapid devel...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622C04B35/626H01P1/20H01P7/10
CPCC04B35/495C04B35/622C04B35/62605C04B2235/3206C04B2235/3215C04B2235/3217C04B2235/3236C04B2235/3256C04B2235/3284C04B2235/3418C04B2235/656C04B2235/6567H01P1/2002H01P7/10
Inventor 应红杨月霞杨彬刘光明付清波宋锡滨
Owner SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD
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