Preparation method of silicon oxide coated modified ZnO pressure-sensitive ceramic material

A technology of pressure-sensitive ceramics and silicon oxide, which is applied in the field of preparation of silicon oxide-coated modified ZnO pressure-sensitive ceramic materials. etc. to achieve the effects of lower sintering temperature, improved breakdown voltage and nonlinear electrical properties

Inactive Publication Date: 2020-05-29
CHANGZHOU CHUANGJIE LIGHTNING PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method of preparing zinc oxide varistors is mechanical ball milling. This process is simple and practical, and the cost is low. However, because it uses a variety of solid oxide powders to synthesize products through mechanical mixing, pressing and sinteri

Method used

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  • Preparation method of silicon oxide coated modified ZnO pressure-sensitive ceramic material
  • Preparation method of silicon oxide coated modified ZnO pressure-sensitive ceramic material
  • Preparation method of silicon oxide coated modified ZnO pressure-sensitive ceramic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Dissolve 2.6g of zinc nitrate, 0.36g of cobalt nitrate, 1.45g of bismuth nitrate, 0.3g of nickel acetate tetrahydrate and 0.2g of manganese chloride in ethylene glycol and distilled water, add 5g of PEG-6000 and 10mL of triethanolamine and continue to stir, ultrasonically react for 120min , and centrifuged to obtain pink precipitated powder, which was dried in an oven at 80 °C. The obtained monodisperse zinc oxide composite powder. Take 1 g, add 100 mL of ethanol, add 100 mL of water and 6 mL of ammonia for surface activation, continue to stir, take 2.5 mL of LTEOS dropwise and add it to the above mixture, stir and react for 20 h, put the powder in an 80°C oven for drying, and press and mold it. Sintered at 1100℃ for 2h to obtain SiO2-coated modified ZnO varistor ceramic material, coat silver paste on both sides of the ceramic, heat treatment at 500℃ for 15min, and test its electrical properties after cooling.

Embodiment 2

[0029] Dissolve 2.6g zinc nitrate, 0.36g cobalt nitrate, 1.45g bismuth nitrate, 0.3g nickel acetate tetrahydrate and 0.2g manganese chloride in ethylene glycol and distilled water, add 5g PEG-6000 and 10mL triethanolamine, continue stirring, ultrasonic reaction After 120 min, centrifuge to obtain pink precipitated powder, which was dried in an oven at 80 °C. The obtained monodisperse zinc oxide composite powder. Take 1 g, add 100 mL of ethanol, add 100 mL of water and 6 mL of ammonia for surface activation, continue to stir, take 5.0 mL of TEOS dropwise and add it to the above mixture, stir and react for 20 hours, and place the powder in an 80°C oven for drying. Sintered at 1100℃ for 2h to obtain SiO2-coated modified ZnO varistor ceramic material, coat silver paste on both sides of the ceramic, heat treatment at 500℃ for 15min, and test its electrical properties after cooling.

Embodiment 3

[0031] Dissolve 2.6g zinc nitrate, 0.36g cobalt nitrate, 1.45g bismuth nitrate, 0.3g nickel acetate tetrahydrate and 0.2g manganese chloride in ethylene glycol and distilled water, add 5g PEG-6000 and 10mL triethanolamine, continue stirring, ultrasonic reaction 120 min, centrifuged to obtain pink precipitated powder, which was dried in an oven at 80 °C. The obtained monodisperse zinc oxide composite powder. Take 1 g, add 100 mL of ethanol, add 100 mL of water and 6 mL of ammonia for surface activation, keep stirring, take 7.5 mL of TEOS dropwise and add it to the above mixture, stir and react for 20 hours, put the powder in an 80°C oven for drying, and then press and form. And 1100 ℃ high temperature sintering for 2 hours to obtain SiO2 coated modified ZnO varistor ceramic material, silver paste was coated on both sides of the ceramic, 500 ℃ high temperature heat treatment for 15 min, and its electrical properties were tested after cooling.

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Abstract

The invention relates to a preparation method of a silicon oxide coated modified ZnO pressure-sensitive ceramic material. Monodisperse zinc oxide pressure-sensitive composite powder is prepared by a simple liquid phase method; then, a precursor of the composite powder is used as a core template, and tetraethoxysilane (TEOS) is hydrolyzed on the surface of the powder to successfully prepare a silicon dioxide uniformly-coated modified zinc oxide composite powder material; and further, the zinc oxide pressure-sensitive ceramic material is prepared through molding and sintering. The breakdown voltage and nonlinear electrical properties are greatly improved, and the sintering temperature of the material is reduced by 100-200 DEG C.

Description

technical field [0001] The invention belongs to the technical field of preparation and application of electronic ceramics, and particularly relates to a preparation method of a silicon oxide-coated modified ZnO pressure-sensitive ceramic material. Background technique [0002] Zinc oxide has a forbidden band width of 3.37 eV and an exciton binding energy of up to 60 meV. It is a semiconductor oxide material widely used in the field of magneto-optics. Zinc oxide varistor functional material is a semiconductor device with excellent nonlinear voltammetry characteristics and high energy absorption capacity. The resistance value changes with the voltage within a certain current range. The ZnO varistor functional material that is widely used now is mainly based on ZnO. Adding several other oxides (mainly transition metal oxides), it has the advantages of excellent non-ohmic characteristics, fast response time (20-50ns), small leakage current, large current capacity, etc. It is wi...

Claims

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Application Information

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IPC IPC(8): C04B35/453C04B35/628C04B35/626C04B41/88
CPCC04B35/453C04B35/62805C04B35/626C04B41/88C04B41/009C04B41/5116C04B2235/3275C04B2235/3298C04B2235/3279C04B2235/3267C04B2235/96C04B41/4539
Inventor 王茂华束静吴昕远
Owner CHANGZHOU CHUANGJIE LIGHTNING PROTECTION
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