Preparation method of high-Q-value microwave dielectric ceramic powder

A technology of microwave dielectric ceramics and powders, applied in the field of ceramic materials, can solve the problems of reducing the dielectric properties of materials, grain growth, vacancies, etc., and achieve the effects of excellent dielectric properties, narrow grain size distribution, and simple process

Active Publication Date: 2021-05-07
HUBEI TIANCI ELECTRONICS MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the ordinary solid-state method is used to synthesize calcium, samarium and titanium series microwave materials, due to the uneven composition and impurities brought about by the process, defects such as vacancies, gaps, and abnormal grain growth of ceramic materials often occur after sintering, which seriously reduce the dielectric strength of the material. electrical properties

Method used

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  • Preparation method of high-Q-value microwave dielectric ceramic powder
  • Preparation method of high-Q-value microwave dielectric ceramic powder
  • Preparation method of high-Q-value microwave dielectric ceramic powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) For the pretreated raw materials, weigh CaCO according to the weight ratio of 20:35:2:13 3 28.57㎏, Sm 2 o 3 50.00kg, Al 2 o 3 2.86㎏ and TiO 2 18.57kg into the ball mill, and follow Add 150 kg of water to the weight ratio and perform ball milling for 12 hours to obtain a slurry;

[0035] 2) the slurry is filtered through a filter press to obtain a filter cake;

[0036] 3) The filter cake is dried, pulverized and sieved in sequence to obtain the precursor powder;

[0037] 4) In the precursor powder according to Add 10kg of SiC microspheres with an average particle size of Φ=5mm to the weight ratio, mix well, pour into a corundum crucible, and pre-sinter at 1200°C for 4 hours to obtain pre-sintered powder;

[0038] 5) In the calcined powder, press After adding 127.5 kg of water by weight, put it into a sand mill and carry out sand milling for 2 hours. After sand milling, the slurry is then press-filtered, dried, crushed and sieved. The obtained powder is cal...

Embodiment 2

[0041] 1) For the pretreated raw materials, weigh CaCO according to the weight ratio of 28:7:10:5 3 56.00kg, Sm 2 o 3 14.00kg, Al 2 o 3 20.00kg and TiO 2 10.00kg into the ball mill, and follow Add 100kg of water to the weight ratio and perform ball milling for 14 hours to obtain a slurry;

[0042] 2) the slurry is filtered through a filter press to obtain a filter cake;

[0043] 3) The filter cake is dried, pulverized and sieved in sequence to obtain the precursor powder;

[0044] 4) In the precursor powder according to Add 20kg of SiC microspheres with an average particle size of Φ=5mm to the weight ratio, mix well, pour into a corundum crucible, and pre-sinter at 1200°C for 4 hours to obtain pre-sintered powder;

[0045] 5) In the calcined powder, press After adding 127.5 kg of water by weight, put it into a sand mill and carry out sand milling for 2 hours. After sand milling, the slurry is then press-filtered, dried, crushed and sieved. The obtained powder is ca...

Embodiment 3

[0048] 1) For the pretreated raw materials, weigh CaCO according to the weight ratio of 36:21:6:7 3 51.43㎏, Sm 2 o 3 30.00kg, Al 2 o 3 8.57kg and TiO 2 10.00kg into the ball mill, and follow Add 130 kg of water to the weight ratio and perform ball milling for 16 hours to obtain a slurry;

[0049] 2) the slurry is filtered through a filter press to obtain a filter cake;

[0050] 3) The filter cake is sequentially dried, pulverized and sieved to obtain the precursor powder;

[0051] 4) In the precursor powder according to Add 15kg of SiC microspheres with an average particle size of Φ=5mm to the weight ratio, mix well, pour into a corundum crucible, and pre-sinter at 1200°C for 4 hours to obtain pre-sintered powder;

[0052] 5) In the calcined powder, press After adding 127.5 kg of water by weight, put it into a sand mill and carry out sand milling for 2 hours. After sand milling, the slurry is then press-filtered, dried, crushed and sieved. The obtained powder is ca...

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Abstract

The invention relates to the technical field of ceramic materials, and discloses a preparation method of high-Q-value microwave dielectric ceramic powder. The preparation method comprises the following steps: 1) pretreating and weighing raw materials; 2) ball milling; 3) filter pressing; 4) preparing precursor powder; (5) pre-sintering; (6) sanding; 7) calcining; and 8) cooling, crushing and sieving. According to the preparation method of the high-Q-value microwave dielectric ceramic powder, SiC microspheres are adopted to form a local micro-region heat source center, a uniform and rapid heating region is formed when CSAT powder is calcined, and the CSAT powder with small particle size and uniform distribution is obtained; meanwhile, the self-made CuO-B2O5-ZnO-MnO2 composite sintering aid is doped so that the sintering temperature of the CSAT powder can be effectively reduced, and the high-performance CSAT microwave dielectric ceramic powder is synthesized.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a method for preparing high-Q microwave dielectric ceramic powder. Background technique [0002] With the rapid development of 5G communication technology, microwave ceramic components (such as ceramic dielectric filters, dielectric antennas, resonators, etc.) are developing towards miniaturization and integration. As the key materials for making ceramic components, microwave ceramic dielectric materials have been obtained widely used. A class of microwave dielectric materials represented by calcium-magnesium-titanium series, because of their excellent dielectric properties such as suitable dielectric constant (21~22) and high quality factor (≥50000), are often used to make microwave Ceramic components. However, ion doping is often used to adjust its resonant frequency temperature coefficient (τ f ), it will significantly reduce the quality factor (Qf), greatly incre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/057C04B35/622C04B35/64
CPCC04B35/50C04B35/057C04B35/622C04B35/64C04B2235/3208C04B2235/3224C04B2235/3217C04B2235/3232C04B2235/6567C04B2235/785C04B2235/95
Inventor 资美勇蔡进红吴浩马鑫熊庆洋张宇
Owner HUBEI TIANCI ELECTRONICS MATERIALS CO LTD
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