Low temperature sintered microwave dielectric ceramic with medium dielectric constant and its prepn process

A microwave dielectric ceramic and low-temperature sintering technology, applied in the field of material science, can solve the problems of reacting with silver electrodes, the inability of materials to have low temperature and dielectric properties, and high sintering temperature, achieving good reproducibility and excellent microwave dielectric properties. , the effect of process stability

Inactive Publication Date: 2005-04-27
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, due to the characteristics of the material itself, the researched material system has problems such as high sintering temperature, inability to achieve low-temperature material and d

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] According to x=0.2 in the expression of the main crystal phase, the molar ratio of CaCO 3 : Li 2 CO 3 : Nb 2 o 5 :TiO 2 = 1.000: 0.1333: 0.2667: 0.2000 Weighing, according to the weight ratio of mixture and ethanol is 1: 1.2, adding ethanol, rolling ball milling at 300r / min for 24h, drying at 80°C, putting into alumina crucible, Calcined at 905°C for 4 hours to synthesize the main crystal phase; add 5wt% Bi to the primary calcined material 2 o 3 , according to the weight ratio of the mixture to ethanol is 1:1.2, add ethanol, roll and mix the mixture at a speed of 300r / min for 24h, dry at 80°C, put it into an alumina crucible, and calcinate at 750°C for 2h; second calcination Add 8wt% ZBS to the material, and the weight ratio of the mixture to ethanol is 1:1.2, add ethanol, roll and mix the material at a speed of 300r / min for 24h, press it into a round block with a diameter of 25mm and a thickness of 12mm at 80Mpa, and heat it at 906°C. Next, sinter and keep warm ...

Embodiment 2

[0024] According to x=0.22 in the expression of the main crystal phase, the molar ratio of CaCO 3 : Li 2 CO 3 : Nb 2 o 5 :TiO 2 =1.000: 0.1300: 0.2600: 0.2200 Weighing, according to the weight ratio of mixture and ethanol is 1: 1.2, adding ethanol, rolling ball milling at 300r / min for 24h, drying at 80°C, putting into alumina crucible, Calcined at 905°C for 4 hours to synthesize the main crystal phase; add 5wt% Bi to the primary calcined material 2 o 3 , according to the weight ratio of the mixture to ethanol is 1:1.2, add ethanol, roll the mixture at a speed of 300r / min for 24h, dry at 80°C, put it into an alumina crucible, and calcinate at 750°C for 2h; second calcination 8wt% ZBS was added to the material, and the weight ratio of the mixture to ethanol was 1:1.2, ethanol was added, the mixture was rolled and mixed at a speed of 300r / min for 24h, and pressed at 80Mpa to form a round block with a diameter of 25mm and a thickness of 12.4mm. It is fired at 906°C and kept...

Embodiment 3

[0026] According to x=0.25 in the expression of the main crystal phase, the molar ratio of CaCO 3 : Li 2 CO 3 : Nb 2 o 5 :TiO 2 = 1.000: 0.125: 0.25: 0.25 Weighing the ingredients, according to the weight ratio of the mixture and ethanol is 1: 1.2, adding ethanol, rolling ball milling at 300r / min for 24h, drying at 80°C, and putting it into an alumina crucible. Calcined at 870°C for 4h to synthesize the main crystal phase; adding 5.5wt% ZnO and 3.75wt% Bi to the primary calcined material 2 o 3 , according to the weight ratio of the mixture to ethanol is 1:1.2, add ethanol, roll and mix the mixture at a speed of 300r / min for 24h, dry at 80°C, put it into an alumina crucible, and calcinate at 750°C for 2h; second calcination 8wt% ZBS was added to the material, and the weight ratio of the mixture to ethanol was 1:1.2, ethanol was added, and the mixture was rolled and mixed for 24 hours at a rotating speed of 300r / min, and pressed into a small round piece with a diameter of ...

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Abstract

The present invention relates to low temperature sintered microwave dielectric ceramic with medium dielectric constant and its preparation process. The microwave dielectric ceramic has Ca(Li1/3Nb2/3)O3 and CaTiO3 as main crystal phase, B2O3, ZnO and ZnO-B2O3-SiO2 glass powder prepared through sol-gel process as sintering assistant. The present invention features the sintering temperature lowered through the synergistic effect of B2O3, ZnO and ZnO-B2O3-SiO2 glass powder, and regulated microwave dielectric performances; the technological process including twice calcining and twice ball milling for full synthesis of the main phase and improvement of powder characteristic; good microwave dielectric performance obtained through sintering at about 900 deg.c and stable technological process. The low temperature sintered microwave dielectric ceramic material may be used in various kinds of microwave devices.

Description

technical field [0001] The invention relates to a medium dielectric constant low-temperature sintered microwave dielectric ceramic and a preparation method thereof, belonging to the technical field of material science. Background technique [0002] Modern mobile communication and wireless local area network are rapidly popularized around the world, and are developing towards miniaturization, light weight, high frequency, integration, high reliability and low cost. This also puts forward higher requirements for microwave circuit components based on microwave dielectric ceramics. The miniaturization and high frequency of microwave circuit components have become the mainstream of technological development. [0003] There are two main ways to realize the miniaturization of microwave devices: exploring high dielectric constant microwave dielectric materials and multilayer structure design of microwave devices. The preparation of multilayer microwave chip microwave components req...

Claims

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Application Information

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IPC IPC(8): C04B35/462C04B35/465C04B35/622C04B35/64H01B3/12
Inventor 杨辉张启龙童建喜王家邦陆德龙尤源
Owner ZHEJIANG UNIV
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