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Zinc oxide pressure-sensitive ceramic material and preparation method thereof

A varistor ceramic and zinc oxide technology, applied in the field of zinc oxide varistor ceramic materials and their preparation, can solve the problem of high residual voltage ratio and leakage current, adverse effects on the electrical properties of varistor ceramics, weak bonding between alumina and zinc oxide and other problems, to achieve the effect of eliminating the influence of pressure-sensitive performance, uniform distribution, high uniformity and dense structure

Active Publication Date: 2020-06-16
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, the combination of alumina and zinc oxide is weak, and it is difficult to dissolve in the crystal phase of zinc oxide during the sintering process and accumulate at the grain boundary, which will adversely affect the electrical properties of the varistor ceramics, making the residual voltage ratio and leakage higher current

Method used

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  • Zinc oxide pressure-sensitive ceramic material and preparation method thereof
  • Zinc oxide pressure-sensitive ceramic material and preparation method thereof
  • Zinc oxide pressure-sensitive ceramic material and preparation method thereof

Examples

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Embodiment 1

[0035] This example is used to illustrate the synthesis method of the zinc oxide and aluminum oxide composite material provided by the present invention. Zinc acetate and aluminum sulfate are used as raw materials for hydrothermal reaction, the molar ratio of zinc acetate and aluminum sulfate to acetic acid is 2:1, the molar concentration of zinc acetate is 0.1mol / L, and the molar concentration of aluminum sulfate is 0.05mol / L. Stir with a stirrer and ultrasonic to mix the solution evenly, add sodium hydroxide according to the molar ratio of sodium hydroxide to zinc acetate is 2:1, transfer the solution to the reaction kettle, and react at 150°C for 24 hours. After cooling, take out the reactor, filter out the precipitate, and wash 5 times with deionized water, then dry at 60°C, and roast at 500°C for 6 hours to obtain ZnO / Al 2 o 3 composite material. figure 1 For the prepared ZnO / Al 2 o 3 The microscopic topography of the composite material, the lamellar structure is zinc...

Embodiment 2

[0037] This example is used to illustrate the synthesis method of the zinc oxide and aluminum oxide composite material provided by the present invention. Using zinc acetate and aluminum sulfate as raw materials for hydrothermal reaction, the molar ratio of zinc acetate and aluminum sulfate to acetic acid is 4:1, the molar concentration of zinc acetate is 0.2mol / L, and the molar concentration of aluminum sulfate is 0.05mol / L. Stir with a stirrer and ultrasonic to mix the solution evenly, add sodium hydroxide according to the molar ratio of sodium hydroxide to zinc acetate is 4:1, transfer the solution to the reaction kettle, and react at 150°C for 24 hours. After cooling, take out the reactor, filter out the precipitate, and wash 5 times with deionized water, then dry at 60°C, and roast at 500°C for 6 hours to obtain ZnO / Al 2 o 3 composite material. Prepared ZnO / Al 2 o 3 The morphology of the composite material is zinc oxide with a lamellar structure, and alumina balls with...

Embodiment 3

[0039] This example is used to illustrate the synthesis method of the zinc oxide and aluminum oxide composite material provided by the present invention. Zinc acetate and aluminum sulfate are used as raw materials for hydrothermal reaction. The molar ratio of zinc acetate and aluminum sulfate to acetic acid is 6:1, the molar concentration of zinc acetate is 0.3mol / L, and the molar concentration of aluminum sulfate is 0.05mol / L. Magnetic stirring Stir and ultrasonically mix the solution evenly, add sodium hydroxide according to the molar ratio of sodium hydroxide to zinc acetate is 6:1, transfer the solution to the reaction kettle, and react at 150°C for 24 hours. After cooling, take out the reactor, filter out the precipitate, and wash 5 times with deionized water, then dry at 60°C, and roast at 500°C for 6 hours to obtain ZnO / Al 2 o 3 composite material. Prepared ZnO / Al 2 o 3 The morphology of the composite material is zinc oxide with a lamellar structure, and alumina bal...

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Abstract

The invention provides a zinc oxide pressure-sensitive ceramic material and a preparation method thereof. The method comprises the following steps: 1) preparing a ZnO / Al2O3 composite material by usinga hydrothermal method; 2) selecting raw materials of ZnO, the ZnO / Al2O3 composite material, Co2O3, MnO2, Cr2O3, Bi2O3, Sb2O3, SiO2, Y2O3 and Sc2O3, uniformly mixing the raw materials, and then carrying out ball milling on the mixture; and 3) carrying out spark plasma sintering on the ball-milled mixture to obtain the zinc oxide pressure-sensitive ceramic material. Zinc oxide prepared by the method is good in binding property with aluminum oxide, the uniform distribution uniformity of aluminum oxide is high, the sintering temperature of the pressure-sensitive ceramic is low, and a sintered body has a grain structure with high uniformity, so that the zinc oxide pressure-sensitive ceramic material has excellent nonlinear electrical properties.

Description

technical field [0001] The invention relates to a novel functional material, in particular to a zinc oxide pressure-sensitive ceramic material used in a power system and a preparation method thereof. Background technique [0002] Zinc oxide varistor is a polycrystalline ceramic doped with different ratios of Bi, Co, Mn, Cr, Sb and other oxides on the basis of zinc oxide. Due to the large nonlinear coefficient of zinc oxide varistor ceramics, high varistor voltage, small leakage current, strong ability to resist instantaneous pulses, simple manufacturing process, low cost, it can absorb high voltage surges and protect overvoltages. Widely used in high-voltage power transmission, electronic devices, industry, transportation, lightning arresters and other fields. [0003] The composition of ceramic raw materials has a direct impact on the comprehensive electrical properties of the resistor. In addition to rare earth oxides, alumina is an important component. Adding alumina wil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453C04B35/64C04B35/626
CPCC04B35/453C04B35/62605C04B35/64C04B2235/3217C04B2235/3224C04B2235/3225C04B2235/3241C04B2235/3267C04B2235/3275C04B2235/3294C04B2235/3298C04B2235/3418C04B2235/666C04B2235/96
Inventor 周卫兵肖宏科李康朱教群
Owner WUHAN UNIV OF TECH
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