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Dielectric composite material and preparation method thereof

A composite material and dielectric technology, which is applied to the parts of fixed capacitors and the dielectric of fixed capacitors, can solve the problems of poor machining performance, and achieve the effects of good machining performance, low cost and simple preparation method.

Inactive Publication Date: 2009-05-06
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the same simple mixed hot pressing process is used to composite metal Ni particles with barium titanate, and the dielectric constant of the composite material can reach more than 1000, but it needs to be calcined at a high temperature of 1300 ° C and its mechanical processing performance is not good.

Method used

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  • Dielectric composite material and preparation method thereof
  • Dielectric composite material and preparation method thereof
  • Dielectric composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: preparation f Al Al-BaTiO = 0.05 3 / PVDF dielectric composites.

[0035] The preparation steps are as follows:

[0036] (1) According to the volume fraction percentage f Al =0.05,f BaTiO3 =0.20,f PVDF =0.75 Weigh the raw materials, convert the volume fraction into mass and weigh 0.0450g, 0.3900g, 0.4500g in turn.

[0037] (2) Add 0.4500g of PVDF weighed into 40ml of N,N-dimethylformamide (DMF), fully dissolve to form a transparent solution.

[0038] (3) BaTiO 3 and Al powder were added to the above solution, and ultrasonically oscillated for 20 minutes to make Al powder, BaTiO 3 Disperses evenly in solution to form a stable suspension.

[0039] (4) Pour the above suspension into a watch glass, and dry in an oven at 100° C. to obtain a dielectric film.

[0040] (5) The above-mentioned dielectric film is hot-pressed into a sheet, and its dielectric properties are tested. Hot pressing conditions: 210°C, 10MPa, 25min.

[0041] Figure 1a It is Al-BaT...

Embodiment 2

[0042] Example 2: preparation f Al Al-BaTiO = 0.25 3 / PVDF dielectric composites. The preparation steps are as follows:

[0043] (1) According to the volume fraction percentage f Al =0.25,f BaTiO3 =0.20,f PVDF =0.55 Weigh the raw materials, convert the volume fraction into mass and weigh 0.2250g, 0.3900g, 0.3300g in turn.

[0044](2) Add the weighed PVDF into 30ml of N,N-dimethylformamide (DMF), fully dissolve to form a transparent solution.

[0045] (3) BaTiO 3 and Al powder were added to the above solution, and ultrasonically oscillated for 20 minutes to make Al powder, BaTiO 3 Disperses evenly in solution to form a stable suspension.

[0046] (4) Pour the above suspension into a watch glass, and dry in an oven at 100° C. to obtain a dielectric film.

[0047] (5) The above-mentioned dielectric film is hot-pressed into a sheet, and its dielectric properties are tested. Hot pressing conditions: 210°C, 10MPa, 25min.

[0048] Figure 2a It is a graph of the relatio...

Embodiment 3

[0049] Example 3: preparation f Al Al-BaTiO = 0.18 3 / PVDF dielectric composites. The preparation steps are as follows:

[0050] (1) According to the volume fraction percentage f Al =0.18,f BaTiO3 =0.20,f PVDF =0.62, convert the volume fraction into mass and weigh 0.1620g, 0.3900g, 0.3720g in turn.

[0051] (2) Add the weighed PVDF into 35ml of N,N-dimethylformamide (DMF), fully dissolve to form a transparent solution.

[0052] (3) BaTiO 3 and Al were added to the above transparent solution, and ultrasonically oscillated for 20 minutes to make Al powder, BaTiO 3 Disperses evenly in solution to form a stable suspension.

[0053] (4) Pour the above suspension into a watch glass, and dry in an oven at 100° C. to obtain a dielectric film.

[0054] (5) The above-mentioned dielectric film is hot-pressed into a sheet, and the dielectric properties are tested. Hot pressing conditions: 210°C, 10MPa, 25min.

[0055] Figure 3a It is a graph of the relationship between diel...

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Abstract

The invention provides a dielectric composite material and a preparation method thereof. The dielectric composite material consists of BaTiO3, aluminum powder and PVDF, wherein the volume fraction of the BaTiO3 is 20 percent, the volume fraction of the metallic aluminum powder is between 5 and 25 percent, and the balance is the PVDF substrate. The preparation method for the material comprises the following steps: the raw materials, namely the aluminum, the BaTiO3 and the PVDF are selected; the PVDF is added into N, N- dimethyl formamide, and fully dissolved to prepare a transparent solution; the BaTiO3 and the aluminum powder are added into the solution and uniformly dispersed in the solution through supersonic vibration, so as to prepare stable suspension; the suspension is poured into a surface vessel which is then placed into an oven for drying the suspension, and a dielectric film is obtained; and the dielectric film is subjected to hot pressing to form a plate, and the dielectric performance of the plate is tested. The preparation method has the characteristics of simple operation, low cost, suitability for industrial production, etc.

Description

technical field [0001] The invention belongs to the technical field of dielectric composite materials, and specifically relates to a high-dielectric, low-loss three-phase dielectric composite material and a preparation method thereof. The material is mainly used for preparing capacitors. Background technique [0002] In the electronics industry, polymer matrix composites with high dielectric constant have very broad application prospects. For capacitors that use polymer materials as dielectrics, most of the polymer dielectrics currently used are polymer single-phase materials. Since the relative dielectric constant of polymer materials is relatively low, generally only about 1 to 3, the It produces capacitors with low capacitance density. If a polymer-based composite material with a higher dielectric constant is used, the capacitance density can be increased by dozens or even hundreds of times while keeping the capacitor size unchanged, or the capacitance density can be mad...

Claims

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Application Information

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IPC IPC(8): C08L27/16C08K3/24C08K3/08C08J5/18H01G4/06
Inventor 邓元张艳景王广胜宋袁曾杨萌
Owner BEIHANG UNIV
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