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Microwave tuning composite ceramic material and preparation method thereof

A composite ceramic and microwave technology, which is applied in the field of microwave tuning composite ceramic materials and its preparation, can solve problems such as the reduction of tuning rate, and achieve the effects of low dielectric loss, light weight, and no toxic side effects

Inactive Publication Date: 2014-08-06
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in order to reduce the dielectric loss of composite ceramics, it is usually necessary to increase the content of linear media such as MgO, resulting in a decrease in tuning rate, and for microwave tuning applications, it is desirable that the tuning rate is as high as possible

Method used

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  • Microwave tuning composite ceramic material and preparation method thereof
  • Microwave tuning composite ceramic material and preparation method thereof
  • Microwave tuning composite ceramic material and preparation method thereof

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preparation example Construction

[0026] The preparation method of the microwave tuning composite ceramic material includes the following steps:

[0027] (1) Prepare Ba 1-x Sr x TiO 3 and Mg 3 B 2 o 6 Powder:

[0028] powdered BaCO 3 , SrCO 3 and TiO 2 Mix in proportion as a set of raw materials, with powdered H 3 BO 3Mix with MgO in proportion as another group of raw materials. Wet ball mill the two groups of raw materials for 6 to 24 hours, then discharge, dry, and pre-calcine at 1000°C to 1300°C for 2 to 6 hours to obtain Ba 1-x Sr x TiO 3 and Mg 3 B 2 o 6 Powder;

[0029] (2) According to the ratio in Ba 1-x Sr x TiO 3 Powder mixed with powdered Mg 3 B 2 o 6 and MgO, dry after wet ball milling for 6-24 hours;

[0030] (3) Add 3-8wt% polyvinyl alcohol (PVA) to the dried material to granulate, and then press to form a green body;

[0031] (4) Heating the green body to 400°C-800°C, the heating rate is less than or equal to 30°C / min, and then keeping it warm for 2-4 hours to remove the ...

Embodiment 1～5

[0035] Prepare Ba separately according to stoichiometric ratio 0.5 Sr 0.5 TiO 3 (x=0.5) and Mg 3 B 2 o 6 . Specifically, the powdered BaCO 3 , SrCO 3 and TiO 2 Mixed in proportion as a set of raw materials, the powdered H 3 BO 3 Mix with MgO in proportion as another group of raw materials, add absolute ethanol or deionized water to the raw materials respectively, use agate balls or zirconium dioxide as ball milling media, and after wet ball milling for 6 hours, discharge and dry the powder. Ba 0.5 Sr 0.5 TiO 3 and Mg 3 B 2 o 6 Powder. Fixed Ba 0.5 Sr 0.5 TiO 3 The mass percentage is 50%, and the remaining 50% is Mg 3 B 2 o 6 and MgO mixture, the mass percentages of MgO in the mixture are 10%, 20%, 40%, 50% and 60% respectively, and the remaining ingredients are Mg 3 B 2 o 6 , respectively corresponding to Examples 1-5, as shown in Table 1. Ba 0.5 Sr 0.5 TiO 3 , Mg 3 B 2 o 6 Mix with MgO, wet ball mill for 6 hours, discharge and dry, use 5wt% pol...

Embodiment 6

[0041] Embodiment 6: x=0.6, Ba 0.4 Sr 0.6 TiO 3 The mass percentage is 30%, Mg 3 B 2 o 6 The mass percentage in the mixture is 70%.

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Abstract

The invention discloses a microwave tuning composite ceramic material and a preparation method thereof. The material is composed of Ba1-xSrxTiO3 and a mixture, the Ba1-xSrxTiO3 accounts for 30%-95% of the material in percentage by mass, x is equal to 0.4-0.6, and the mixture comprises Mg3B2O6 and MgO; the Mg3B2O6 accounts for 30%- 90%o of the mixture in percentage by mass; the material has the advantages that the dielectric loss is low, and the tuning rate is high; the preparation method for the composite ceramic material comprises the following steps: preparing the Ba1-xSrxTiO3 and the Mg3B2O6 powder, blending the powdery Mg3B2O6 and MgO into the Ba1-xSrxTiO3, and conducting wet process ball milling and drying; adding PVA (Polyvinyl Alcohol) to conduct granulation, and preparing green-pressing by press forming; conducting heat preservation on the green-pressing for 2-4 h at the temperature of 400-800 DEG C to eliminate organic matters in the green-pressing, and sintering, so that the microwave tuning composite ceramic material is obtained. According to the microwave tuning composite ceramic material and the preparation method thereof, the preparation technology is simple, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of microwave ceramic materials, and more specifically relates to a microwave tuning composite ceramic material and a preparation method thereof. Background technique [0002] Microwave devices such as tunable filters, delay lines, phase shifters, oscillators, resonators, and phased array antennas are important devices in the field of microwave communications, but their high cost limits their wide commercial application. Low-cost tuning technology will revolutionize the microwave components and antenna industry. [0003] The dielectric constant of microwave tuning materials can change with the applied voltage. Applied in the field of microwave communication, the operating frequency of the component can be changed by applying an external voltage, such as a filter that can produce frequency hopping, which is very important for future broadband communication, because it can enable several users to transmit and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/622
Inventor 徐业彬何艳艳李长年何卓
Owner HUAZHONG UNIV OF SCI & TECH
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