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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  • Abstract
  • Description
  • Claims
  • Application Information

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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 comp

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
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Example Embodiment

[0034] Example 1: Preparation f Al =0.05 Al-BaTiO 3 / PVDF dielectric composite material.

[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, and convert the volume fraction to mass, and then weigh 0.0450g, 0.3900g, 0.4500g.

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

[0038] (3) Put BaTiO 3 Add Al powder and Al powder to the above solution, ultrasonically shake for 20min, make Al powder, BaTiO 3 Evenly dispersed in the solution to form a stable suspension.

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

[0040] (5) Hot-press the above-mentioned dielectric film into a sheet, and test its dielectric properties. Hot pressing conditions: 210℃, 10MPa, 25min.

[0041] Figure 1a It is ...

Example Embodiment

[0042] Example 2: Preparation f Al = 0.25 Al-BaTiO 3 / PVDF dielectric composite material. 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, and convert the volume fraction into mass, and then weigh 0.2250g, 0.3900g, 0.3300g.

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

[0045] (3) Put BaTiO 3 Add Al powder and Al powder to the above solution, ultrasonically shake for 20min, make Al powder, BaTiO 3 Evenly dispersed in the solution to form a stable suspension.

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

[0047] (5) Hot-press the above-mentioned dielectric film into a sheet, and test its dielectric properties. Hot pressing conditions: 210℃, 10MPa, 25min.

[0048] Figure 2a It is a diagram of the...

Example Embodiment

[0049] Example 3: Preparation f Al =0.18 Al-BaTiO 3 / PVDF dielectric composite material. 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 sequence.

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

[0052] (3) Put BaTiO 3 Add Al and Al to the above transparent solution, ultrasonically shake for 20min, make Al powder, BaTiO 3 Evenly dispersed in the solution to form a stable suspension.

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

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

[0055] Figure 3a It is a diagram of the relations...

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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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