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High-energy and high-potential gradient tin dioxide varistor composite powder and preparation method

A technology of composite powder and tin dioxide, applied in the high-energy field, can solve the problems that the uniformity of additive doping cannot be improved continuously, the electrical performance of varistor cannot be greatly improved, etc. control, improve electrical properties, and refine the effect of grain size

Inactive Publication Date: 2016-01-06
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This particle size range is not much different from the particle size of the main base material zinc oxide, so this method cannot continue to improve the doping uniformity of additives, and the electrical properties of varistors cannot be greatly improved.

Method used

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  • High-energy and high-potential gradient tin dioxide varistor composite powder and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In a ball mill, 0.1 mol% of nano-titanium dioxide particles, 0.9 mol% of cobalt trioxide powder, 0.1 mol% of niobium pentoxide powder, 0.5 mol% of hexapraseodymium oxide powder, and 0.5 mol% of diyttrium trioxide powder were mixed, Ball milling for 4 hours to make a mixture, wherein the titanium dioxide particles are monodisperse nano-scale particles, which are mixed into the composite powder in the form of a hydrosol, and the content of titanium dioxide in the hydrosol is 10w%;

[0025] Add 97.85 mol% of submicron tin dioxide powder and 0.05 mol% of nano antimony pentoxide particles to the obtained mixture, and then ball mill for 2 hours to make a mixture, wherein the nano antimony pentoxide particles are monodisperse nano Grade particles, mixed into the composite powder in the form of hydrosol, the content of antimony pentoxide in the hydrosol is 10w%;

[0026] The obtained mixture is dried and sieved to obtain a powder of the mixture;

[0027] Then place the powder ...

Embodiment 2

[0030]In a ball mill, mix 1 mol% of nano-titanium dioxide particles, 1.5 mol% of cobalt trioxide powder, 0.4 mol% of niobium pentoxide powder, 0.5 mol% of hexapraseodymium oxide powder and 0.5 mol% of diyttrium trioxide powder, and ball mill 3 hours,

[0031] A mixture is made, wherein the titanium dioxide particles are monodisperse nanoscale particles, which are mixed into the composite powder in the form of a hydrosol, and the content of titanium dioxide in the hydrosol is 30w%;

[0032] Add 95.6 mol% of submicron tin dioxide powder and 0.5 mol% of nano antimony pentoxide particles to the obtained mixture, and then ball mill for 1 hour to make a mixture, wherein the antimony pentoxide particles are monodisperse nano-scale Particles are mixed into the composite powder in the form of hydrosol, and the content of antimony pentoxide in the hydrosol is 30w%;

[0033] The obtained mixture is dried and sieved to obtain the powder of the mixture;

[0034] Then place the powder of ...

Embodiment 3

[0037] In a ball mill, 0.1 mol% of nano titanium dioxide particles, 1.5 mol% of cobalt trioxide powder, 0.4 mol% of niobium pentoxide powder, 0.5 mol% of hexapraseodymium oxide powder and 0.5 mol% of diyttrium trioxide powder are mixed, Ball milling for 6 hours to make a mixture, wherein the titanium dioxide particles are monodisperse nano-scale particles, which are mixed into the composite powder in the form of a hydrosol, and the content of titanium dioxide in the hydrosol is 15w%;

[0038] Add 96.5 mol% of submicron tin dioxide powder and 0.5 mol% of nano antimony pentoxide particles to the obtained mixture, and then ball mill for 3 hours to make a mixture, wherein the antimony pentoxide particles are monodisperse nano-scale The particles are mixed into the composite powder in the form of hydrosol, and the content of antimony pentoxide in the hydrosol is 20w%;

[0039] The obtained mixture is dried and sieved to obtain the powder of the mixture;

[0040] Then place the pow...

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Abstract

The invention relates to high-energy high-potential-gradient type tin dioxide piezoresistor composite powder and a preparation method. The composite powder is prepared from the following components: SnO2, Co2O3, TiO2, Sb2O5, Nb2O5, Pr6O11 and Y2O3 and titanium dioxide, antimony pentoxide, cobaltic oxide, niobium pentoxide, praseodymium oxide and yttria are doped in submicron-class tin dioxide powder, wherein praseodymium oxide and yttria are used as potential gradient reinforcing agents; both titanium dioxide and antimony pentoxide are monodispersed nano particles; nano antimony pentoxide can react with tin dioxide in the sintering process to be converted into a spinel phase and is uniformly distributed in a crystal boundary; by a crystal boundary pinning effect, abnormal grain growth of tin dioxide crystal grains is inhibited. Addition of antimony pentoxide also can be used for controlling the average particle size of the crystal grains, so that crystal grain and crystal boundary densities in unit volume are reinforced and the final product has the characteristics of high energy density, high potential gradient, small leakage current, good batch production consistency and the like. The preparation method is simple and controllable and can be used for mass industrial production.

Description

technical field [0001] The invention relates to a high-energy, high-potential gradient tin dioxide varistor composite powder and a preparation method thereof, belonging to the technical field of preparation and application of electronic ceramics. Background technique [0002] Varistor powder is the raw material used to make varistors. The varistor is a voltage-limiting protective device resistance device with nonlinear volt-ampere characteristics. It is mainly used for voltage clamping when the circuit is subjected to overvoltage, and absorbs excess current to protect sensitive devices. Utilizing the nonlinear volt-ampere characteristics of the varistor material, when an overvoltage appears between the two poles of the varistor, the varistor can clamp the voltage to a relatively fixed voltage value, thereby realizing the protection of the subsequent circuit . In a certain temperature and a specific voltage range, the current of the varistor increases sharply with the incre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/457C04B35/622
Inventor 徐金宝张家齐边亮王磊
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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