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Medium temperature sintered microwave dielectric material with medium dielectric constant and high Q value

A technology of microwave dielectric materials and microwave dielectric ceramics, which is applied in the field of microwave dielectric materials and preparation, can solve the problems of difficulty in meeting the development requirements of high-performance microwave device integration, low quality factor, high sintering temperature, etc., and achieves high Q value, The effect of high density of porcelain and environmental protection in the process

Inactive Publication Date: 2018-01-12
TIANJIN UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages and deficiencies of the existing intermediary system, such as the low quality factor and excessively high sintering temperature, which are difficult to meet the needs of the integrated development of high-performance microwave devices, and provide a medium-temperature sintered medium dielectric constant, high Q value microwave dielectric material

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  • Medium temperature sintered microwave dielectric material with medium dielectric constant and high Q value

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Embodiment Construction

[0016] The present invention will be further described below through specific examples.

[0017] The preparation method of a medium-temperature sintered medium-permittivity high-Q microwave dielectric material of the present invention, the steps are as follows:

[0018] (1) the present invention adopts analytically pure raw material, ZnO, Nb 2 o 5 According to the mass molar percentage of 3:1, mixed with absolute ethanol, ball milled for 8 hours, dried and pre-fired at 1075°C for 4 hours to obtain Zn 3 Nb 2 o 8 Solid particles;

[0019] (2) Step (1) pre-burns the gained Zn 3 Nb 2 o 8 The solid particles are subjected to secondary ball milling in absolute ethanol for 8 hours, and after drying, pass through a 80-mesh sieve to obtain Zn 3 Nb 2 o 8 powder;

[0020] (3) Gained Zn in step (2) 3 Nb 2 o 8 In powder, according to (1-x)Zn 3 Nb 2 o 8 -xAl 2 o 3 -yGeO 2 , where the stoichiometric formula of 02 o 3 with GeO 2 , ball milled in absolute ethanol for 8 ho...

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Abstract

The invention discloses a medium temperature sintered microwave dielectric material with a medium dielectric constant and a high Q value. The composition of the microwave dielectric material is as follows: (1-x) Zn3Nb2O8-xAl2O3-yGeO2, wherein x is more than 0 and less than or equal to 0.09, and y is more than 0 and less than or equal to 0.3. A preparation method of the microwave dielectric material comprises the following steps: firstly, blending ZnO and Nb2O5 according to a molar ratio of 3 to 1, carrying out ball-milling on the obtained mixture at the temperature of 1075 DEG C, and then presintering to obtain Zn3Nb2O8 solid particles; carrying out secondary ball-milling on the Zn3Nb2O8 solid particles, drying, and sieving to obtain Zn3Nb2O8 powder; adding oxide-Al2O3 and GeO2 into the Zn3Nb2O8 powder according to a stoichiometric ratio, carrying out ball-milling, drying, sieving, granulating, pressing to obtain a green body, and sintering the green body at the temperature of 1160-1190 DEG C so as to obtain the microwave dielectric ceramics. The epsilon r value of the microwave dielectric material is 19.5-21, the Qf value of the microwave dielectric material is 90000-100000GHz, the temperature coefficient of resonance frequency is -60 to -70ppm / DEG C, and the sintering temperature is lower than 1200 DEG C. The microwave dielectric material is simple in technique, environment-friendly in process and excellent in performance, thus having very good application prospect.

Description

technical field [0001] The invention belongs to a ceramic composition characterized by components, in particular to a Zn 3 Nb 2 o 8 A microwave dielectric material with medium dielectric constant and high Q value and its preparation method. Background technique [0002] In recent years, the rapid development of microwave communication technology has put forward higher requirements for the microwave dielectric material system. Microwave dielectric ceramics have the characteristics of light weight, low cost, high dielectric constant, low loss, and small temperature coefficient of resonance frequency. It has been widely used in microwave electronic components. Intermediate microwave dielectric ceramics refer to microwave dielectric ceramics with a dielectric constant of 20 to 50, which are often used to make various communication filter devices, and are widely used in mobile phone base stations and satellite communications. Due to the large range of dielectric constants, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622
Inventor 李玲霞张博文
Owner TIANJIN UNIV
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