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High-dielectric composite material containing carbon nanotube and its prepn process

A technology of carbon nanotubes and composite materials, which is applied in the field of high dielectric materials, can solve the problems of lack of toughness, limited use, and low flexibility of materials, and achieve the effects of good material toughness, lower molding temperature, and simple preparation process

Inactive Publication Date: 2003-07-30
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

(2) Using the percolation effect to add conductive components to the ferroelectric phase can greatly increase the dielectric constant of the composite material, but high temperature co-firing is required, and the material lacks sufficient toughness
[0004] The nickel / barium titanate / polyvinylidene fluoride three-phase composite material previously studied by the inventor has a high dielectric constant, but its flexibility is not high, and its use as an excellent dielectric material for capacitors will be limited

Method used

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  • High-dielectric composite material containing carbon nanotube and its prepn process
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  • High-dielectric composite material containing carbon nanotube and its prepn process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 A1-A5

[0027] Different CNT according to the ratio of A1-A5 in Table 1 and 20vol.%, 0.5852 grams of BaTiO 3 , the three are fully mixed evenly, and hot-pressed on a hot press at 200°C (pressure 10MPa, time 20min) to form a series of samples, which are as follows: figure 1 The characteristic curves of the shown dielectric properties and dielectric loss, and the relationship curves of the dielectric constant (a) and conductivity (b) in Fig. 2 with the experimental frequency.

Embodiment 2

[0028] Example 2 A1-A5

[0029] The dielectric properties of the samples prepared in Example 1 as a function of the experimental temperature are shown in Figure 3. SEM of pristine carbon nanotubes as Figure 4 shown. The SEM morphology of the cross-section of the composite sample containing carbon nanotubes is as follows: Figure 5 shown.

[0030] Table 1 Ingredient formula

[0031] PVDF CNT

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Abstract

The high-dielectric constant composite material contains carbon nanotube 2-12 vol%, BaTiO3 20 vol% and organic polyvinylidene fluoride 68-78 vol%. The preparation process is one hot pressing process with low forming temperature and short period. The composite material has high dielectric constant over 450, simple preparation process and high toughness. Through regulating the content of additive components and different physical and chemical treatment, the dielectric constant and toughness may be altered obviously. It has wide application foreground.

Description

technical field [0001] The invention relates to a high dielectric constant composite material containing carbon nanotubes and a preparation method thereof. It belongs to the technical field of high dielectric materials. Background technique [0002] High dielectric composite materials are widely used in electronics and power engineering technology. Surface Mount Components (SMC) or overall packaging technology is the key technology to realize the miniaturization, light weight and thinning of electronic machines: the overall packaging technology requires the use of embedded capacitors, and the capacitor dielectric material must have a high dielectric constant. At present, the surface mount capacitors used are basically multilayer ceramic dielectric capacitors (MLCC). Although the inorganic ceramic capacitor material has a very high dielectric constant, the ceramic capacitor needs to be co-fired with the electrode at high temperature, and the process is complicated and consum...

Claims

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Application Information

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IPC IPC(8): C08K3/24C08L27/16
Inventor 南策文党智敏沈洋
Owner TSINGHUA UNIV
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