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Adjustable negative dielectric constant metamaterial and preparation method thereof

A technology of metamaterials and raw materials, applied in the field of metamaterials, can solve the problems of difficult control, non-adjustable single-negative dielectric constant metamaterials, etc., and achieve the effect of stable performance

Inactive Publication Date: 2019-05-07
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that single negative permittivity metamaterials cannot be adjusted and are difficult to control, the present invention provides an adjustable negative permittivity metamaterial and its preparation method, which has the advantages of simple preparation method and stable performance, and can be used in design Research fields such as absorbing materials and electromagnetic shielding

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  • Adjustable negative dielectric constant metamaterial and preparation method thereof
  • Adjustable negative dielectric constant metamaterial and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0021] (1) According to the chemical formula x Mo / (1-x) Al 2 o 3 Weighing and batching according to the ratio, take 6gAl 2 o 3 , 0.18gTiO 2 As a sintering aid;

[0022] (2) Put the powder obtained in step (1) into a ball milling tank, add agate balls, use absolute ethanol as the ball milling medium, and mill for 6 hours, wherein raw materials: ball stone: ethanol = 1:2:1.5, discharge and bake After drying in the oven for 80 o C drying;

[0023] (3) Add an appropriate amount of 5% polyvinyl alcohol to the powder in step (2) as a binder to grind the obtained powder, pass through a 100-mesh sieve after granulation, hold the pressure for 60s under a pressure of 10MPa, pass Compressed into a ceramic sheet with φ=19mm and t=2mm;

[0024] (4) After embedding the ceramic sheet in step (3) with materials of the same composition, place it at 1550 o C, under the protection of Ar atmosphere, when sintering 2 in a vacuum tube furnace, the sintering temperature curve is: room temper...

Embodiment 2

[0027] (1) According to the chemical formula x Mo / (1-x) Al 2 o 3 Weighing and batching, take 5.4gAl 2 o 3 , 0.6gMo,

[0028] 0.18gTiO 2 As a sintering aid;

[0029] (2) Put the powder obtained in step (1) into a ball milling tank, add agate balls, use absolute ethanol as the ball milling medium, and mill for 6 hours, wherein raw materials: ball stone: ethanol = 1:2:1.5, discharge and bake After drying in the oven for 80 o C drying;

[0030] (3) Add an appropriate amount of 5% polyvinyl alcohol to the powder in step (2) as a binder to grind the obtained powder, pass through a 100-mesh sieve after granulation, hold the pressure for 60s under a pressure of 10MPa, pass Compressed into a ceramic sheet with φ=19mm and t=2mm;

[0031] (4) After embedding the ceramic sheet in step (3) with materials of the same composition, place it at 1550 o C, under the protection of Ar atmosphere, when sintering 2 in a vacuum tube furnace, the sintering temperature curve is: room temperatu...

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Abstract

The invention relates to a preparation method of an adjustable negative dielectric constant Mo / Al2O3 metamaterial, wherein the composition of the material can be represented by a chemical formula x Mo / (1-x)Al2O3, and x is more than or equal to 0 and is less than or equal to 0.8. The preparation method comprises: (1) material preparing, ball milling, and drying screening; (2) molding; and (3) sintering. According to the present invention, by filling the matrix of the alumina ceramic with the Mo metal as the electric-conduction phase, the composite material has the excellent performances of highstrength and the like of ceramic materials, further has electrical conductivity, and can achieve the negative dielectric constant within a certain magnetic field range.

Description

technical field [0001] The invention relates to the technical field of metamaterials, in particular to a preparation method of metamaterials. Background technique [0002] Traditionally speaking, the parameters of the dielectric properties of our commonly used materials are all positive, but with the continuous improvement and requirements of material design and preparation, we have begun to explore materials with negative parameters that do not exist in nature, such as materials with negative dielectric constants. , Negative magnetic permeability, negative refractive index and other parameters, we also call them metamaterials. [0003] In 2000, based on Pendry's previous research, Smith et al. prepared metamaterials (Metamaterials) with periodic metal structure arrays, and first realized negative permittivity and magnetic permeability in them, which triggered the research on metamaterials. upsurge. Composite materials composed of conductive fillers and insulator dielectri...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622C04B41/88
Inventor 沈建兴孙晓程传兵
Owner QILU UNIV OF TECH