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Large-scale preparation method of low-cost ceramic substrate for filter

A ceramic substrate and filter technology, applied in ceramic molding machines, waveguide devices, manufacturing tools, etc., can solve the problems of being unsuitable for large-scale production, low production efficiency, and many technological processes, and achieve no risk of toxicity and low cost , evenly distributed effect

Inactive Publication Date: 2020-12-01
CHENGDU SCI & TECH DEV CENT CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main components of the filter are microwave dielectric ceramic resonators and / or microwave dielectric ceramic substrates. At present, the main preparation methods of microwave dielectric ceramics for 5G base station filters are dry pressing molding and box furnace sintering, which can achieve low temperature drift, high Q value and other excellent performance The preparation of microwave dielectric ceramic substrates has good application value; however, these methods generally have many processes, low production efficiency, and high cost, which are not suitable for large-scale production, and it is even more difficult to meet the huge demand for current filter ceramics
The dielectric ceramics currently used in mainstream 5G base station filters (frequency bands 2.6G and 3.5G) are medium and low dielectric constant materials, including MgTiO 3 System, BaO-TiO 2 system, perovskite system and composite system, etc.; most of the ceramic materials are prepared by traditional solid-state method. In order to ensure the electrical properties of the material system, the sintering temperature is usually above 1400 ° C, which is not only difficult to sinter, but also the preparation cost is high.

Method used

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  • Large-scale preparation method of low-cost ceramic substrate for filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Prepare 1 kg of slurry at a time, add 600g of barium niobate ceramic powder raw materials with a particle size of 4um, 5g of polymethacrylic acid, and 298g of deionized water into a nylon grinding tank for the first grinding and mixing, and the ball milling speed is 200r / min, the grinding time is 36 hours, the obtained dispersion slurry has good dispersibility, and the median particle size of the slurry powder is reduced to 1.2um;

[0031] Add 60g of poly(ethyl alcohol butyral) as a binder, 3.6g of polyethylene glycol 400 as a plasticizer, and 1g of an emulsion-type silicone defoamer to the dispersion slurry obtained above, and perform ball milling for the second time. The ball milling speed is 180r / min, and the milling time is 6 hours. The obtained casting slurry has good viscosity and stability, and the viscosity value is 3.5Pa.S;

[0032] The cast slurry was subjected to vacuum defoaming treatment for 0.5 hours, the stirring speed was 80 rpm, and the vacuum degree w...

Embodiment 2

[0037]Prepare 1 kg of slurry at a time, add 550g of barium niobate ceramic powder raw materials with a particle size of 2um, 4g of polymethacrylic acid, and 360g of deionized water into a nylon grinding tank for the first grinding and mixing, and the ball milling speed is 200r / min, the grinding time is 32 hours, the obtained dispersion slurry has good dispersibility, and the median particle size of the slurry powder is reduced to 0.7um;

[0038] Add 50g of PVA+PVC as a binder, 35.5g of polyethylene glycol 400 as a plasticizer, and 0.5g of an emulsion-type silicone defoamer to the dispersion slurry obtained above, and perform ball milling for the second time. The speed is 180r / min, and the grinding time is 8 hours. The obtained casting slurry has good viscosity and stability, and the viscosity value is 2.7Pa.S;

[0039] The casting slurry is subjected to vacuum degassing treatment for 0.5 hours, the stirring speed is 60 rpm, and the vacuum degree is -0.075MPa;

[0040] Pour t...

Embodiment 3

[0044] Prepare 1 kg of slurry at a time, add 620g of barium niobate ceramic powder raw materials with a particle size of 5um, 6.5g of polyacrylic acid, and 250g of deionized water into a nylon grinding tank for the first grinding and mixing, and the ball milling speed is 200r / min , the grinding time is 48 hours, the obtained dispersion slurry has good dispersibility, and the median particle size of the slurry powder is reduced to 1.4um;

[0045] Add 75g of ethyl cellulose as a binder, 43g of dibutyl phthalate as a plasticizer, and 1.5g of an emulsion-type silicone defoamer to the dispersion slurry obtained above, and perform ball milling for the second time , the ball milling speed is 180r / min, and the milling time is 8 hours. The cast slurry obtained has good viscosity and stability, and the viscosity value is 3.8Pa.S;

[0046] The cast slurry was subjected to vacuum degassing treatment for 0.8 hours, the stirring speed was 120 rpm, and the vacuum degree was -0.095MPa;

[00...

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Abstract

The invention provides a large-scale preparation method of a low-cost ceramic substrate for a filter of a 5G base station. The ceramic substrate comprises the following components in parts by mass: 55to 65 parts of Ba5Nb4O15 microwave dielectric ceramic powder, 0.3 to 0.8 part of a dispersing agent, 25 to 36 parts of a water base, 5 to 10 parts of an adhesive, 3 to 8 parts of a plasticizer and 0.05 to 0.2 part of a defoaming agent. The large-scale preparation method comprises the following steps: conducting step-by-step ball milling and uniform mixing to obtain casting slurry with a viscosityof 2.5-4 Pa.S; and carrying out continuous casting forming, drying and tunnel kiln sintering successively to obtain the ceramic substrate for the filter. The method is based on a water-based tape casting and continuous forming sintering process, so high pollution, high risk and high cost caused by tape casting of an organic solvent method are avoided, and continuous large-scale preparation is achieved to a great extent; the obtained ceramic substrate is free of warping, smooth and uniform in appearance structure and high in density; mass production of the ceramic substrate enables the requirement for considerable dielectric ceramic substrates for filters at present to be met; and the method is suitable for industrial production.

Description

technical field [0001] The invention relates to a large-scale preparation method of ceramic substrates for low-cost filters, which belongs to the application field of microwave dielectric ceramics, in particular to Ba 5 Nb 4 o 15 It is a mass production method of microwave dielectric ceramic tape casting and sintering; Background technique [0002] Filters for base stations are extremely important RF front-end components in network communications, which can ensure information integrity and eliminate interference factors in transmission. Microwave dielectric ceramics for 5G base station filters are new functional electronic ceramic materials used in microwave frequency band (UHF, SHF) circuits, and are widely used in modern communications such as communications, radar, and positioning. In the current 5G era, the global 5G users have exceeded 100 million, and more than 700,000 5G base stations have been built; within 5 years, the number of 5G base stations will exceed 5 mil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622C04B35/626C04B35/638C04B35/64B28B1/29B28B11/24H01P1/20
CPCC04B35/495C04B35/622C04B35/6261C04B35/638C04B35/64B28B1/29B28B11/243H01P1/2002C04B2235/3215C04B2235/5436C04B2235/656C04B2235/6567C04B2235/96C04B2235/77
Inventor 李春宏谭雄康晓丽崔旭东
Owner CHENGDU SCI & TECH DEV CENT CHINA ACAD OF ENG PHYSICS