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A kind of ultra-low dielectric constant microwave dielectric ceramic material and preparation method thereof

A technology of microwave dielectric ceramics and ultra-low dielectric constant, applied in ceramics, inorganic insulators, etc., can solve problems such as poor sintering characteristics and high temperature coefficient of resonance frequency, and achieve improved sintering density, near-zero temperature coefficient of resonance frequency, and improved compactness effect

Active Publication Date: 2020-06-30
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the defects of the above-mentioned prior art, the present invention provides an ultra-low dielectric constant microwave dielectric ceramic material, which has an ultra-low dielectric constant and a resonant frequency temperature coefficient close to zero, which solves the problem of the dielectric constant and resonant frequency of existing materials. High temperature coefficient, poor sintering characteristics, etc.

Method used

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  • A kind of ultra-low dielectric constant microwave dielectric ceramic material and preparation method thereof
  • A kind of ultra-low dielectric constant microwave dielectric ceramic material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0020] Weigh the sintering aid analytically pure CaF 2 0.5g, analytically pure MnO 2 2.5g, put it in an agate mortar and grind it by hand for 20min, and then use it for later use. Weigh out 95g of fused silica powder with a purity greater than 99%, a crystallinity of 0-5%, a particle size of 1-1.5μm and a purity greater than 99.9%, and a particle size of 500nm Put 2g of quartz powder in a rolling mill tank for 9 hours, take out the mixed powder and put it in a ball mill tank, mix it with ethanol for 1 hour and take it out, add manually ground CaF to the slurry 2 +MnO 2 Continue ball milling for 5 hours after the auxiliary agent is powdered, add 0.6wt% methylcellulose to the dried powder and mix, then slowly add 0.9wt% methylcellulose dropwise during the granulation process for granulation , the granulated material is sieved to obtain a coarse powder between 150 mesh and 400 mesh, and then put it into a metal mold for cold pressing to form, and place the formed block in a hig...

Embodiment 2

[0022] Weigh the sintering aid analytically pure CaF 2 1g, analytically pure MnO 2 2g, put it in an agate mortar and grind it by hand for 25min, then take it for later use, weigh 94.5g of fused silicon micropowder with a purity greater than 99%, a crystallinity of 0-5%, a particle size of 1-1.5μm and a purity greater than 99.9%, and a particle size of 500nm Put 2.5g of quartz powder in a tumbling tank and grind it for 10 hours. The mixed powder is taken out and placed in a ball milling tank, mixed with ethanol for 1 hour, taken out, and manually ground CaF 2 +MnO 2 Continue ball milling for 6 hours after the auxiliary agent is powdered, first add 1.5wt% methylcellulose to the dried powder and mix, then slowly add 1.5wt% methylcellulose dropwise during the granulation process for granulation , the granulated material is sieved to obtain a coarse powder between 150 mesh and 400 mesh, and then put it into a metal mold for cold pressing to form, and place the formed block in a h...

Embodiment 3

[0024] Weigh the sintering aid analytically pure CaF 2 1.5g, analytically pure MnO 2 1.5g, put it in an agate mortar and grind it by hand for 30min, and then use it for later use. Weigh 94g of fused silicon micropowder with a purity greater than 99%, a crystallinity of 0-5%, a particle size of 1-1.5μm and a purity greater than 99.9%, and a particle size of 500nm Put 3g of quartz powder in a tumbling tank and grind for 11 hours. The mixed powder is taken out and placed in a ball milling tank, mixed with ethanol for 1.5 hours and taken out. Add manually ground CaF to the slurry. 2 +MnO 2 After the auxiliary powder is powdered, continue ball milling for 7 hours, add stearic acid accounting for 0.6wt% of the powder to the dried powder and mix, and then slowly add stearic acid accounting for 0.9wt% of the powder dropwise during the granulation process for granulation. The pellets are sieved to obtain a coarse powder between 150 mesh and 400 mesh, and then put into a metal mold fo...

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Abstract

The invention discloses an ultralow dielectric constant microwave dielectric ceramic material. The material is prepared by sintering, by mass, 93-95% of fused silica powder, 2-4% of nanometer silica powder, 0.5-2.5% of CaF2 and 0.5-2.5% of MnO2, and the principal phase of the ultralow dielectric constant microwave dielectric ceramic material is crystalline state SiO2. The invention further discloses a preparation method of the ultralow dielectric constant microwave dielectric ceramic material. The method comprises the steps that S1, CaF2 and MnO2 powder are ground and mixed; S2, the fused silica powder and the nanometer silica powder are mixed, the CaF2 and MnO2 mixed powder obtained in step 1 is added, and wet process ball milling is performed to obtain a mixture; S3, the mixture obtainedin step 2 is dried, granulation and pressing are performed to obtain a perform body, and the perform body is sintered to obtain the ceramic material. The ultralow dielectric constant microwave dielectric ceramic material is wide in raw material source, the preparation method is simple and convenient to implement, practical application and production are facilitated, the obtained ceramic materialis low in dielectric constant, the temperature coefficient of resonance frequency approaches to zero, and the ultralow dielectric constant microwave dielectric ceramic material can be widely applied to manufacturing microwave devices such as a microwave substrate and a missile radome.

Description

technical field [0001] The invention relates to a ceramic material and a preparation method thereof, in particular to an ultra-low dielectric constant microwave dielectric ceramic material and a preparation method thereof. Background technique [0002] In microwave communication systems, microwave dielectric materials are the main materials for various microwave components, and their performance plays a key role in the stability and communication quality of the entire communication system. In recent years, with the rapid development of technologies such as wireless communication, wireless network, satellite TV live broadcast, Bluetooth, global positioning system and military guidance, the high frequency, integration, high stability and low cost of microwave equipment have become an inevitable trend. Today's communication frequency continues to increase, making a series of problems such as signal delay, increased heat generation of equipment, and poor system stability increas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B3/12C04B35/14
CPCC04B35/14C04B2235/3267C04B2235/445C04B2235/96
Inventor 王哲飞余磊孙跃罗嵘潇王旭红殷仕龙胡秀丽
Owner CHANGSHU INSTITUTE OF TECHNOLOGY
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