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Microwave dielectric ceramic with low loss and low dielectric constant and preparation method of microwave dielectric ceramic

A technology of microwave dielectric ceramics and low dielectric constant, applied in the field of electronic ceramics and its preparation, can solve the problems of high sintering temperature and small dielectric loss value, and achieve low sintering temperature, low dielectric constant and simple preparation process Effect

Active Publication Date: 2015-03-25
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dielectric constant of these lanthanide ceramic materials is generally less than 30, and the Qf 0 Both are greater than 10000GHz, and the dielectric loss value is small. The disadvantage is that the temperature coefficient of the resonant frequency of these ceramic materials is not zero, and it needs to be doped or modified to adjust its temperature coefficient. The sintering temperature of the lanthanide microwave dielectric ceramic material Also relatively high, such as LaAlO 3 The sintering temperature reaches 1600°C

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A kind of microwave dielectric ceramic with low loss and low dielectric constant of the present invention, the chemical formula of this microwave dielectric ceramic is LaBO 3 , the dielectric constant is 11.3, the quality factor Qf 0 It is 70150GHz, and the resonant frequency temperature coefficient is -57ppm / ℃.

[0021] A method for preparing a microwave dielectric ceramic with low loss and low dielectric constant according to the above embodiment, comprising the following steps:

[0022] (1) First, 20g La with a purity greater than 99.9% 2 o 3 with 4.27g B 2 o 3 Mix and place in a ball mill jar, then add zirconia balls and isopropanol into the ball mill jar, carry out solid-liquid separation and drying after planetary ball milling for 4 hours, and obtain a uniformly mixed composite powder; heat the composite powder to 850°C for pre- Burn for 2 hours with a heating rate of 5°C / min (5°C / min to 10°C / min is generally preferred, the same below), to obtain ceramic powd...

Embodiment 2

[0030] A kind of microwave dielectric ceramic with low loss and low dielectric constant of the present invention, the chemical formula of this microwave dielectric ceramic is LaBO 3 , the dielectric constant is 11.5, the quality factor Qf 0 It is 72210GHz, and the resonant frequency temperature coefficient is -54ppm / ℃.

[0031] A method for preparing a microwave dielectric ceramic with low loss and low dielectric constant according to the above embodiment, comprising the following steps:

[0032] (1) First, 20g La with a purity greater than 99.9% 2 o 3 with 4.27g B 2 o 3 Mix and place in a ball mill jar, then add zirconia balls and isopropanol into the ball mill jar, carry out solid-liquid separation and drying after planetary ball milling for 4 hours, and obtain a uniformly mixed composite powder, heat the composite powder to 900°C for pre- Burn for 4 hours with a heating rate of 5°C / min to obtain ceramic powder, place the ceramic powder in a ball mill jar, and add zirco...

Embodiment 3

[0036] A kind of microwave dielectric ceramic with low loss and low dielectric constant of the present invention, the chemical formula of this microwave dielectric ceramic is LaBO 3 , the dielectric constant is 11.3, the quality factor Qf 0 It is 70940GHz, and the resonant frequency temperature coefficient is -55ppm / ℃.

[0037] A method for preparing a microwave dielectric ceramic with low loss and low dielectric constant according to the above embodiment, comprising the following steps:

[0038] (1) First, 20g La with a purity greater than 99.9% 2 o 3 with 4.27g B 2 o 3 Mix and place in a ball mill jar, then add zirconia balls and isopropanol into the ball mill jar, perform solid-liquid separation and drying after ball milling for 6 hours, to obtain a uniformly mixed composite powder, heat the composite powder to 850°C for pre-calcination 2h, the heating rate was 5°C / min, and the ceramic powder was obtained. The ceramic powder was placed in a ball mill jar, and zirconia ...

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Abstract

The invention discloses microwave dielectric ceramic with low loss and a low dielectric constant and a preparation method of the microwave dielectric ceramic. The chemical formula of the microwave dielectric ceramic is LaBO3, the dielectric constant of the microwave dielectric ceramic is 10-13, the quality factor of the microwave dielectric ceramic is 70000-78000 GHz, and the temperature coefficient of resonance frequency of the microwave dielectric ceramic ranges from -48 ppm / DEG C to -57 ppm / DEG C. The preparation method comprises the following steps of (1) performing ball milling, solid-liquid separation and drying on La2O3 and B2O3, or La2O3 and H3BO3 after mixing to form composite powder, presintering, ball-milling, drying and sieving the composite powder to form LaBO3 powder, and (2) pelleting the LaBO3 powder to form a ceramic powder aggregate, pressing into a green body, performing glue removal and sintering, and obtaining the microwave dielectric ceramic with the low loss and the low dielectric constant. The microwave dielectric ceramic has the low dielectric constant and the low dielectric loss, and can be sintered at a moderate temperature. The preparation method is simple in technology, low in cost and environment-friendly.

Description

technical field [0001] The invention belongs to the field of electronic ceramics and its preparation, and in particular relates to a microwave dielectric ceramic with low loss and low dielectric constant and a preparation method thereof. Background technique [0002] At present, microwave dielectric ceramic materials are making important contributions to the miniaturization, integration and high-quality of microwave circuits. Microwave dielectric ceramic materials have a fundamental position in modern communication technology, especially in the field of mobile communication technology, and the continuous research and development of it has become an important driving force for the development of mobile communication technology. However, most of the common microwave dielectric ceramic materials have inherent disadvantages of high sintering temperature, which greatly limits their application in microwave circuits and devices. Low temperature sintering is mostly at the expense ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/622C04B35/50
Inventor 张为军刘卓峰陈兴宇白书欣堵永国
Owner NAT UNIV OF DEFENSE TECH