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Ceramic-based ternary composite material with weak negative dielectric properties and preparation method thereof

A composite material and ceramic-based technology, which is applied in the field of ceramic-based ternary composite materials and its preparation, can solve the problems that the performance needs to be further improved and reduced, and achieve the effect of good technology transformation prospect and simple process.

Active Publication Date: 2021-04-09
SHANGHAI MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Insulating metal materials or selecting semiconducting materials can reduce the value of negative dielectric constant to a certain extent, but its performance still needs to be further improved

Method used

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  • Ceramic-based ternary composite material with weak negative dielectric properties and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Weigh titanium nitride, multi-walled carbon nanotubes and copper calcium titanate powder according to the mass ratio of 23:4:23, put them in a ball mill jar, add absolute ethanol as a ball mill medium, and Ball milled in a ball mill for 10 hours.

[0029] (2) Drying the ball-milled slurry in a vacuum drying oven, the drying temperature is 80° C., and the drying time is 12 hours. The dried powder is ground and sieved for later use.

[0030] (3) Add an appropriate amount of binder polyvinyl alcohol to titanium nitride, multi-walled carbon nanotubes and copper calcium titanate composite powder for granulation, put it into a mold and use a hydraulic press for dry pressing to obtain a disc shaped body. The pressure is 30Mpa, and the holding time is 1 minute.

[0031] (4) Put the green body into a tubular furnace filled with nitrogen for high-temperature sintering, the sintering temperature is 950°C, and the holding time is 1 hour.

[0032] (5) The titanium nitride / mu...

Embodiment 2

[0034] (1) Weigh titanium nitride, multi-walled carbon nanotubes and copper calcium titanate powder according to the mass ratio of 9:2:9, and place them in a ball mill jar, add absolute ethanol as a ball mill medium, and Ball milled in a ball mill for 10 hours.

[0035] (2) Drying the ball-milled slurry in a vacuum drying oven, the drying temperature is 80° C., and the drying time is 12 hours. The dried powder is ground and sieved for later use.

[0036] (3) Add an appropriate amount of binder polyvinyl alcohol to titanium nitride, multi-walled carbon nanotubes and copper calcium titanate composite powder for granulation, put it into a mold and use a hydraulic press for dry pressing to obtain a disc shaped body. The pressure is 30Mpa, and the holding time is 1 minute.

[0037] (4) Put the green body into a tubular furnace filled with nitrogen for high-temperature sintering, the sintering temperature is 950°C, and the holding time is 1 hour.

[0038] (5) The titanium nitrid...

Embodiment 3

[0040] (1) Weigh titanium nitride, multi-walled carbon nanotubes and copper calcium titanate powder according to the mass ratio of 9:2:9, and place them in a ball mill jar, add absolute ethanol as a ball mill medium, and Ball milled in a ball mill for 10 hours.

[0041] (2) Drying the ball-milled slurry in a vacuum drying oven, the drying temperature is 80° C., and the drying time is 12 hours. The dried powder is ground and sieved for later use.

[0042] (3) Add an appropriate amount of binder polyvinyl alcohol to titanium nitride, multi-walled carbon nanotubes and copper calcium titanate composite powder for granulation, put it into a mold and use a hydraulic press for dry pressing to obtain a disc shaped body. The pressure is 30Mpa, and the holding time is 1 minute.

[0043] (4) Put the green body into a tubular furnace filled with argon for high-temperature sintering, the sintering temperature is 950°C, and the holding time is 1 hour.

[0044] (5) The titanium nitride / m...

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Abstract

The invention discloses a ceramic-based ternary composite material with weak negative dielectric property and a preparation method. The preparation method comprises the following steps: 1, respectively weighing titanium nitride, multi-walled carbon nanotubes and copper calcium titanate, then mixing, the mass of the multi-walled carbon nanotubes accounts for 6-12% of the total mass of the mixture, and crushing the mixture to obtain slurry; 2, drying the slurry, and grinding the solid to obtain powder; 3, adding polyvinyl alcohol into the powder, granulating the mixture, and carrying out dry pressing molding to obtain a green body; and step 4, sintering the green body to obtain the ceramic-based ternary composite material. Compared with metal materials, pure titanium nitride and the like, the negative dielectric constant of the titanium nitride / multi-walled carbon nanotube / copper calcium titanate ternary composite material prepared by the method is lower than 200 and can approach zero near a specific frequency, and the titanium nitride / multi-walled carbon nanotube / copper calcium titanate ternary composite material particularly has important application value in the aspects of high-power microwave devices, attenuation porcelain and the like in the military field. Besides, the preparation technology provided by the invention is simple and convenient in process, can realize batch production of products, and has a good technical transformation prospect.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a ceramic-based ternary composite material with weak negative dielectric properties and a preparation method. Background technique [0002] In traditional physics, it is generally believed that the dielectric constant of a material can only be positive. In fact, when the dielectric constant is less than 1 or even negative, the material has extraordinary properties. Especially with the development of metamaterials, negative permittivity has attracted more and more attention because of its unique physical properties and its important application prospects in electromagnetic shielding, energy storage, and wireless inductors. Compared with polymer materials, ceramic materials with negative dielectric properties have more advantages in structural strength, chemical stability and thermal conductivity, especially in microwave devices and attenuating ceramics. [0003] The free elect...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/622
CPCC04B35/58014C04B35/622C04B2235/3234C04B2235/5288C04B2235/6567C04B2235/602C04B2235/658
Inventor 孙凯杨鹏涛田加红屈云鹏段文欣范润华类延华
Owner SHANGHAI MARITIME UNIVERSITY
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