Zinc oxide resistor disc and preparation method thereof

A zinc oxide resistor sheet, zinc oxide technology, applied in the direction of varistor, varistor core, etc., can solve the problems of development lag, technology blockade, etc., achieve low equipment requirements, high energy density, easy mass production Effect

Active Publication Date: 2021-07-13
STATE GRID HUNAN ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Our country lags behind in the research and development of this aspect, and developed countries such as the United States and Japan have carried out in-depth research on this type of material, but they have formed a technical blockade for our country.

Method used

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  • Zinc oxide resistor disc and preparation method thereof
  • Zinc oxide resistor disc and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1. The raw material formula is as follows: 96.30mol% ZnO, 1.00mol% Bi 2 o 3 , 1.00mol% Sb 2 o 3 , 0.50mol% Cr 2 o 3 , 0.50mol% Co 2 o 3 , 0.50mol% MnO 2 , 0.10mol% Y 2 o 3 and 0.10mol% Al 2 o 3 .

[0045] Wherein, 96.30mol% of ZnO includes: 20mol% of 500nm particles; 55mol% of 90nm particles; 21.30mol% of 30nm particles.

[0046] 2. Preparation method

[0047] 1. Dry the above oxides at 80°C for 24 hours, then weigh them in proportion, add them to a planetary ball mill, use ethanol as the medium, and ZrO 2 The ball is abrasive, 400 rpm -1 , ball milling for 6h;

[0048] 2. Dry the slurry after ball milling at 80°C for 36 hours to remove ethanol;

[0049] 3. Add a 4wt% PVA binder aqueous solution of 10% of the total powder mass to the dried mixed oxide, and seal and stale for 24 hours;

[0050] 4. The stale mixed oxide is molded into a disc-shaped green body with a diameter of 30mm and a thickness of 3.0mm under 100MPa;

[0051] 5. These blanks were dri...

Embodiment 2

[0056] 1. The raw material formula is as follows: 94.6mol% ZnO, 1.0mol% Bi 2 o 3 ,1.0mol%Sb 2 o 3 ,1.0mol% Co 2 o 3 ,1.0mol% SiO 2 ,0.5mol%MnO 2 ,0.5mol%Cr 2 o 3 , 0.40mol% Ga 2 o 3 .

[0057] Wherein, 94.6mol% of ZnO includes: 30mol% of 500 micron particles; 40mol% of 90nm particles; 24.60mol% of 30nm particles.

[0058] 2. Preparation method

[0059] 1. Dry the above oxides at 80°C for 24 hours to constant weight, then weigh them in proportion, add them to a planetary ball mill, use ethanol as the medium, ZrO 2 The ball is abrasive, 400 rpm -1 , ball milling for 6h;

[0060] 2. After ball milling, dry the slurry at 80°C for 36 hours to constant weight to remove ethanol;

[0061] 3. Add a 4wt% PVA binder aqueous solution of 20% of the total powder mass to the dried mixed oxide, and seal and stale for 24 hours;

[0062] 4. The stale mixed oxide is molded into a disc-shaped green body with a diameter of 40mm and a thickness of 3.0mm under 100MPa;

[0063] 5. Dr...

Embodiment 3

[0068] 1. The raw material formula is as follows: ZnO 95.41mol%; Bi 2 o 3 1.30mol%; Sb 2 o 3 1.50mol%; MnO 2 0.75mol%; Co 3 o 4 0.60mol%; Ni 2 o 3 0.40mol%; Al 2 o 3 0.04 mol%.

[0069] Among them, 95.41mol% of ZnO includes: 40mol% of 500 micron particles, 35mol% of 90nm particles, and 20.41mol% of 30nm particles.

[0070] 2. Preparation method

[0071] 1. Dry the above-mentioned substances at 80°C for 24 hours to constant weight, then weigh them in proportion, add them to a planetary ball mill, use ethanol as the medium, ZrO 2 The ball is abrasive, 400 rpm -1 , ball milling for 6h;

[0072] 2. Dry the slurry after ball milling at 70°C to constant weight for 48 hours to remove ethanol;

[0073] 3. Add a 4wt% PVA binder aqueous solution of 15% of the total powder mass to the dried mixed oxide, and seal and stale for 24 hours;

[0074] 4. The stale mixed oxide is molded into a disc-shaped green body with a diameter of 60mm and a thickness of 3.0mm under 100MP...

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Abstract

The invention relates to the technical field of inorganic non-metallic materials, and particularly discloses a zinc oxide resistor disc with excellent comprehensive performance and a preparation method thereof. According to the method, on the basis of an existing solid phase method, the density of a green body is improved through raw material particle size grading, the influence of factors such as high porosity, low sintering density, poor particle size uniformity after sintering and uncontrollable grain boundary thickness which are likely to happen to a single raw material particle size on the performance of the zinc oxide resistor disc is overcome, and then the sintering compactness of the resistor disc is improved. According to the invention, crystallization of the resistor disc after sintering is further controlled, the uniformity of the particle size after sintering is improved, and the thickness of the grain boundary layer is regulated, so that the electrical performance of the zinc oxide resistor disc is improved; and the zinc oxide resistor disc prepared by the method has the advantages of high potential gradient, nonlinear coefficient and energy density, low leakage current and residual voltage ratio and the like, the preparation process is simple, the requirement on equipment is low, and batch production is easy.

Description

technical field [0001] The invention relates to the technical field of inorganic non-metallic materials, in particular to a zinc oxide resistance sheet. Background technique [0002] With the development of ultra-high voltage (500-750kV) and ultra-high voltage (higher than 750kV) power transmission and transformation technology, the safety, reliability and miniaturization of the ZnO varistor sheet as the core component of the arrester are increasingly high. The research on ZnO varistors with high potential gradient and large overcurrent capacity has become one of the keys to develop a new generation of ZnO arresters at home and abroad. In my country, the development of ultra-high voltage and high-power transmission and transformation projects such as west-to-east power transmission and north-south mutual supply has continuously increased the transmission voltage and transmission capacity of the power grid. The urgent need for the construction of high-voltage and ultra-high-v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453C04B35/622C04B41/88H01C7/112
CPCC04B35/453C04B35/622C04B41/009C04B41/5116C04B41/88H01C7/112C04B2235/3241C04B2235/3298C04B2235/3294C04B2235/3275C04B2235/3267C04B2235/3225C04B2235/3217C04B2235/5445C04B2235/5454C04B2235/602C04B2235/606C04B2235/656C04B2235/6562C04B2235/6565C04B2235/6567C04B41/4535C04B41/0072
Inventor 王博闻高朋召陈宝辉陈会会张佩
Owner STATE GRID HUNAN ELECTRIC POWER
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