Zinc oxide resistance sheet and preparation method thereof

A technology of zinc oxide resistors and zinc oxide, applied in the direction of varistors, varistor cores, etc., can solve the problem that zinc oxide resistors cannot meet the requirements of reducing sintering energy consumption, and achieve grain size reduction and particle distribution Uniformity, the effect of improving the ability to absorb energy

Active Publication Date: 2022-04-26
STATE GRID HUNAN ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the existing zinc oxide resistance sheet cannot satisfy the technical problem of reducing sintering energy consumption while controlling the uniform growth of crystal grains

Method used

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Examples

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preparation example Construction

[0033] This specific embodiment also proposes the preparation method of the above-mentioned zinc oxide resistor, comprising the following steps:

[0034] 1) Granulation: Weigh the raw materials and mix them with water according to the molar percentage, and add polyacrylamine dispersant for grinding according to the mass ratio of raw materials and dispersant of 6-7:1, and grind until the particle size of the particles in the slurry reaches Below 0.5 μm, add polyvinyl alcohol binder to the slurry according to the mass ratio of raw material to binder 5-6:1, and then spray-dry the slurry into pellets; choose a grain diameter of 0.5 Materials below μm (nanoscale) are mixed and pressed into tablets to improve the uniformity of dopant mixing and distribution, improve the overall performance of the resistor, and improve the stability of the zinc oxide resistor.

[0035] 2) tableting: pressing the pellets obtained in step 1) into a tablet to obtain a pre-finished zinc oxide resistance ...

Embodiment 1

[0041] The raw materials of the present embodiment are prepared according to the following molar percentages, and the specific formula is as follows:

[0042] Zinc oxide base material 98.2%, tungsten oxide 0.6%, calcium oxide 1.2%.

[0043] In the zinc oxide resistance sheet above, the zinc oxide base material includes raw materials in the following molar ratio: zinc oxide: 93.8%, cobalt oxide: 1.2%, bismuth oxide: 2.3%, manganese oxide: 0.9%.

[0044] The preparation method of the zinc oxide resistance plate of the present embodiment may further comprise the steps:

[0045] (1) Ingredients: Weigh the raw materials according to the above mole percentage formula: zinc oxide: 93.8%, cobalt oxide: 1.2%, bismuth oxide: 2.3%, manganese oxide: 0.9%, tungsten oxide 0.6%, calcium oxide 1.2%. The proportion of each component is precisely controlled by using a large-range balance and a precision balance in conjunction with weighing.

[0046] (2) Wet milling and granulation: Add the ra...

Embodiment 2

[0052] The raw materials of the present embodiment are prepared according to the following molar percentages, and the specific formula is as follows:

[0053] Zinc oxide base material 97.8%, tungsten oxide 1.0%, calcium oxide 1.2%.

[0054] In the zinc oxide resistance sheet above, the zinc oxide base material includes raw materials in the following molar proportions: zinc oxide: 93.4%, cobalt oxide: 1.2%, bismuth oxide: 2.3%, manganese oxide: 0.9%.

[0055] The preparation method of the zinc oxide resistance plate of the present embodiment may further comprise the steps:

[0056] (1) Ingredients: The following raw materials are weighed according to the above mole percentage formula: zinc oxide: 93.4%, cobalt oxide: 1.2%, bismuth oxide: 2.3%, manganese oxide: 0.9%, tungsten oxide 1.0%, calcium oxide 1.2%. A large scale balance and a precision balance are used for weighing to accurately control the proportion of each component.

[0057] (2) Wet milling and granulation: Add th...

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Abstract

The invention relates to a zinc oxide resistance sheet and a preparation method thereof. The zinc oxide resistance sheet is sintered from the following molar percentages of raw materials: 94.5% to 99% of zinc oxide base material, 0.2% to 1.6% of tungsten oxide, 0.7% to 3.6% of calcium oxide; 94.5% to 99% of the The zinc oxide base material includes raw materials with the following molar percentages: 91%-94% of zinc oxide, 1%-1.5% of cobalt oxide, 1.5%-2.5% of bismuth oxide and 0.6%-1% of manganese oxide. The zinc oxide resistance sheet proposed by the present invention can improve its electrical properties such as voltage gradient on the basis of reducing sintering energy consumption, wherein the voltage gradient can be as high as 547V / mm, and the flow capacity can reach 350J / cm 3 . The invention also proposes a preparation method of the zinc oxide resistor, including granulation, tablet pressing, pre-sintering and sintering. The method improves the performance of the zinc oxide resistor and is also beneficial to reduce energy consumption.

Description

technical field [0001] The invention relates to the technical field of preparation and application of electronic ceramic materials, in particular to a zinc oxide resistance sheet and a preparation method thereof. Background technique [0002] At this stage, zinc oxide resistors are widely used in lightning protection components such as lightning arresters due to their excellent nonlinear characteristics and breakdown characteristics. With the construction of UHV, the volume and quality of zinc oxide valves used in surge arresters have increased significantly. In order to reduce the volume and mass of the zinc oxide valve plate and make it miniaturized, it is necessary to improve the voltage gradient and flow stability of the zinc oxide varistor. [0003] Si, Sb, Cr and other elements are added to the traditional resistance sheet formula to improve its potential gradient and compactness, Si0 2 Form Zn with Zn0 2 Si0 4 Amorphous phase, with spinel Zn 7 Sb 2 o 12 It also...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/453C04B35/622C04B35/64H01C7/112
CPCC04B35/453C04B35/622C04B35/64H01C7/112C04B2235/3258C04B2235/3208C04B2235/3275C04B2235/3298C04B2235/3262C04B2235/85C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/667
Inventor 陆佳政王博闻方针蒋正龙胡建平
Owner STATE GRID HUNAN ELECTRIC POWER
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