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A kind of preparation method of pressure sensitive composite material

A pressure-sensitive composite material and composite material technology, applied in the field of preparation of high-performance pressure-sensitive composite materials, can solve problems such as high dielectric constant, large dielectric loss, and large leakage current, and achieve improved grain boundary resistance and low residual voltage ratio, the effect of low leakage current

Active Publication Date: 2022-07-12
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the widely used ZnO varistor has good pressure-sensitive characteristics, it has the disadvantages of high dielectric constant, large dielectric loss, large leakage current and high residual voltage ratio, which greatly restricts its application.

Method used

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  • A kind of preparation method of pressure sensitive composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method of a pressure-sensitive composite material, the specific steps are:

[0026] (1) Preparation of ZnO-based pressure-sensitive ceramics: First, the granulated commercial ZnO-based pressure-sensitive ceramic powder was pressed into a circular blank under a pressure of 200 MPa; then the blank was kept at 1300 °C for 10 minutes, and then cooled Heat preservation at 800°C for 1 hour to obtain ZnO-based porous ceramics;

[0027] (2) Preparation of high-performance ZnO-based pressure-sensitive composite materials: The obtained ZnO-based porous ceramics were dried in a vacuum oven for 24 hours; at the same time, the cyanate ester was heated and melted into a liquid state. Then, the ZnO-based ceramics were soaked in cyanate ester liquid in vacuum for 1 hour, taken out, and then cured at 200 °C for 2 hours to obtain a high-performance ZnO-based pressure-sensitive composite material.

[0028] Properties of the pressure-sensitive composite material prepared in ...

Embodiment 2

[0030] A preparation method of a pressure-sensitive composite material, the specific steps are:

[0031] (1) Preparation of ZnO-based pressure-sensitive ceramics: First, the granulated commercial ZnO-based pressure-sensitive ceramic powder was pressed into a circular body under a pressure of 100 MPa; then the body was kept at 1250 °C for 30 minutes, and then cooled Heat preservation at 850°C for 2 hours to obtain ZnO-based porous ceramics;

[0032](2) Preparation of high-performance ZnO-based pressure-sensitive composite materials: The obtained ZnO-based porous ceramics were dried in a vacuum oven for 16 hours; at the same time, the cyanate ester was heated and melted into a liquid state. Then, the ZnO-based ceramic was soaked in cyanate ester liquid for 2 hours in vacuum, taken out, and the sample was cured at 220°C for 2 hours to obtain a high-performance ZnO-based pressure-sensitive composite material.

[0033] The properties of the pressure-sensitive composite material pr...

Embodiment 3

[0035] A preparation method of a pressure-sensitive composite material, the specific steps are:

[0036] (1) Preparation of ZnO-based pressure-sensitive ceramics: First, the granulated commercial ZnO-based pressure-sensitive ceramic powder was pressed into a circular body under a pressure of 50MPa; then the body was kept at 1300 °C for 30 minutes, and then cooled Heat preservation at 850°C for 2 hours to obtain ZnO-based porous ceramics;

[0037] (2) Preparation of high-performance ZnO-based pressure-sensitive composite materials: The obtained ZnO-based porous ceramics were dried in a vacuum oven for 24 hours; at the same time, the cyanate ester was heated and melted into a liquid state. Then, the ZnO-based ceramics were soaked in a cyanate ester liquid for 0.5 hours in vacuum, taken out, and then cured at 240 °C for 1 hour to obtain a high-performance ZnO-based pressure-sensitive composite material.

[0038] Properties of the pressure-sensitive composite material prepared in...

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Abstract

The invention discloses a preparation method of a pressure-sensitive composite material. The pressure-sensitive composite material is composed of a commercial ZnO-based pressure-sensitive ceramic and a thermosetting polymer. The preparation method is as follows: (1) ZnO-based pressure-sensitive The ceramic powder is pressed into a round or square blank; (2) the blank is sintered at a suitable temperature to form a ZnO-based ceramic; (3) the ZnO-based ceramic is compounded and cured with a thermosetting polymer to obtain a high-performance pressure-sensitive composite material. Compared with the prior art, the present invention has the advantages of simple preparation process, low cost, energy saving and emission reduction, and the prepared composite material has a high-pressure sensitivity coefficient α (>60) and a low leakage current (<0.10 μA / cm). 2 ), low residual voltage ratio (<1.3), low dielectric constant (<300) and low dielectric loss (<0.015), which have broad application prospects and industrial value.

Description

technical field [0001] The invention belongs to the field of material and device preparation, in particular to a preparation method of a high-performance pressure-sensitive composite material. Background technique [0002] ZnO varistor ceramics means that when current flows through ZnO varistor ceramics, its current will show non-linear characteristics with the increase of voltage I-V, and this characteristic can quickly change from high resistance to high resistance when instantaneous surge current occurs in the circuit. The state changes to a low-resistance state, and it conducts a large current while protecting the circuit. It is an important class of functional ceramics. Its basic features are appropriate varistor voltage value, high nonlinear coefficient and low leakage current. And it can be well adapted to a variety of pulse currents with different waveforms. These specific properties make ZnO varistor ceramic materials widely used in lightning arresters in the powe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L79/04C08K3/22
CPCY02P20/10
Inventor 郑兴华赵丁仪蔡冬青刘用涛
Owner FUZHOU UNIV