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Co-based temperature-stable type microwave dielectric ceramic and preparing method thereof

A microwave dielectric ceramic and temperature-stable technology, which is applied in the field of Co-based temperature-stable microwave dielectric ceramics and its preparation, can solve problems affecting equipment performance, carrier signal drift, etc., and achieve simple chemical composition and preparation process, dielectric Adjustable constant, easy to adjust the temperature coefficient of resonant frequency

Inactive Publication Date: 2016-01-20
XIAN TECHNOLOGICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the resonant frequency of the microwave dielectric material changes greatly with temperature, the carrier signal of components such as filters will drift at different temperatures, thus affecting the performance of the equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The raw material Co will be analyzed for purity 2 o 3 , Nb 2 o 5 and TiO 2 By formula (1-0.5x) TiO 2 -(1-0.5x)CoO-0.5xNb 2 o 5 (wherein x = 0.5) after the molar ratio preparation, fully mixed ball mill (200 rpm) for 4 hours, then dried at 120 ° C, passed through a 120 mesh sieve, briquetting, and kept at 1150 ° C for 4.5 hours in an air atmosphere. Hour, obtain sample briquette;

[0031] Then pulverize the sample sintered block and then carry out secondary ball milling, the ball milling time is 5 hours, after drying at 120°C, granulate (mix the powder with the aqueous solution of polyvinyl alcohol, and then make micron-sized spherical particles), After double-layer sieving with 60 mesh and 120 mesh screens, the required ceramic material can be obtained; the ceramic material can be pressed and molded as required, and then sintered at 1250°C for 2 hours to form porcelain, and the Co-based temperature-stable microwave dielectric can be obtained. Ceramics and materi...

Embodiment 2

[0035] The raw material Co will be analyzed for purity 2 o 3 , Nb 2 o 5 and TiO 2 By formula (1-0.5x) TiO 2 -(1-0.5x)CoO-0.5xNb 2 o 5 (wherein x = 0.6) after the molar ratio preparation, fully mixed ball mill (200 rpm) for 4 hours, then dried at 120 ° C, passed through a 120 mesh sieve, briquetted, and kept at 1150 ° C for 4.5 hours in an air atmosphere. Hour, obtain sample briquette;

[0036]Then pulverize the sample sintered block and then carry out secondary ball milling, the ball milling time is 5 hours, dry and granulate after drying at 120°C (mix the powder with an aqueous solution of polyvinyl alcohol, and then make micron-sized spherical particles), Through double-layer sieving of 60 mesh and 120 mesh sieves, the required ceramic material can be obtained; the ceramic material can be pressed and molded as required, and then sintered at 1280°C for 2 hours to form porcelain, and the Co-based temperature-stable microwave dielectric can be obtained. Ceramics and mat...

Embodiment 3

[0040] The raw material Co will be analyzed for purity 2 o 3 , Nb 2 o 5 and TiO 2 By formula (1-0.5x) TiO 2 -(1-0.5x)CoO-0.5xNb 2 o 5 (wherein x = 0.65) after the molar ratio is prepared, fully mix ball mill (200 rpm) for 4 hours, then dry at 120 ° C, pass through a 120 mesh sieve, briquette, and keep warm at 1150 ° C for 4.5 hours in an air atmosphere. Hour, obtain sample briquette;

[0041] Then pulverize the sample sintered block and then carry out secondary ball milling, the ball milling time is 5 hours, dry and granulate after drying at 120°C (mix the powder with an aqueous solution of polyvinyl alcohol, and then make micron-sized spherical particles), After double-layer sieving with 60 mesh and 120 mesh sieves, the desired ceramic material can be obtained; the ceramic material can be pressed into shape as required, and then sintered at 1300°C for 2 hours to form porcelain, and the Co-based temperature-stable microwave dielectric can be obtained. Ceramics and mate...

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PUM

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Abstract

The invention discloses a Co-based temperature-stable type microwave dielectric ceramic and a preparing method thereof, and belongs to the field of electronic ceramic and preparing thereof. The ceramic is expressed as (1-0.5x)TiO2-(1-0.5x)CoO-0.5xNb2O5, wherein x is larger than or equal to 0.5 and smaller than or equal to 0.75. The Co-based temperature-stable type microwave dielectric ceramic is prepared with the simplest and most effective solid-phase reaction sintering method. The preparing method includes the steps that a formula in the proper proportion is selected, proper initial oxide is selected, the various kinds of oxide are mixed to be even through primary ball milling and primarily reacted through the pre-sintering process, the size of particles of the reactants is refined through secondary ball milling, and finally the required ceramic sample is obtained through the sintering process. By means of the simple, practicable and effective preparing method, the dielectric constant of the obtained ceramic sample is changed from 31.3 to 42 along with changes of ingredients, Qf is distributed from 40,900 GHz to 42,300 GHz, the temperature coefficient of resonance frequency is close to zero and easy to control (-16 ppm / DEG C to +18 ppm / DEG C), and sintering temperature ranges from 1,250 DEG C to 1,340 DEG C.

Description

technical field [0001] The invention belongs to the field of electronic ceramics and its preparation, in particular to a Co-based temperature-stable microwave dielectric ceramic and its preparation method. Background technique [0002] Microwave dielectric ceramics are a new type of functional ceramic materials developed in the past thirty years. It refers to a ceramic material used as a dielectric material in circuits in the microwave frequency band (mainly 300MHz to 300GHz frequency band) and fulfills one or more functions. This material is a new type of functional ceramic material developed with the rapid development of the mobile communication industry in recent decades. It is mainly used to make microwave components such as resonators, filters, dielectric antennas, and dielectric waveguide circuits. It can be used in mobile communications, satellite communications and military radar. Its outstanding features are high dielectric constant, low loss, and small temperatur...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622
Inventor 庞利霞刘卫国周迪纪红芬王欣
Owner XIAN TECHNOLOGICAL UNIV
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