Preparation method of zinc oxide varistor sheet

A varistor, zinc oxide technology, applied in varistor, varistor core, resistor manufacturing and other directions, can solve the problems of high power consumption, high energy consumption, long time consumption, etc., to reduce energy consumption, The effect of increasing the voltage gradient and contributing to grain boundary diffusion

Active Publication Date: 2022-07-19
STATE GRID HUNAN ELECTRIC POWER +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, high-temperature sintering is a key process that determines the electrical properties of zinc oxide varistors, but it is also the process that consumes the longest time and consumes the most energy in the entire process preparation process. At present, various manufacturers carry out high-temperature sintering of zinc oxide varistors It usually takes 2 to 3 days from heating up, keeping warm to cooling down to room temperature, and the box furnace or tunnel furnace used as the heat source in the whole process has to work with high power consumption

Method used

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  • Preparation method of zinc oxide varistor sheet
  • Preparation method of zinc oxide varistor sheet
  • Preparation method of zinc oxide varistor sheet

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preparation example Construction

[0026] This specific embodiment proposes a preparation method of a zinc oxide varistor sheet, comprising the following steps:

[0027] 1) Preparation of mixed slurry: take zinc oxide as the main material and auxiliary materials including bismuth oxide as raw materials, weigh the raw materials in proportion, pour in deionized water 1.0-1.5 times the weight of the powder, and add polyacrylic acid ammonia dispersant , in the sand mill, set the rotating speed to 1500-2500r / min, grind at high speed for 1-2h, and obtain the mixed slurry. The raw materials in molar percentage include zinc oxide: 93.5-95.5%, bismuth oxide: 1.0-2.5%, antimony oxide: 1-1.5%, cobalt oxide: 0.5-1.0%, manganese oxide: 0.45-1.0%, dioxide Silicon: 0.5-1.5%, boron trioxide: 0.15-0.4%, aluminum nitrate: 0.05-0.15%.

[0028] 2) Preparation of green body: add polyvinyl alcohol binder to the mixed slurry, spray dry, pass the dried powder through an 80-100 mesh sieve, and press it to an initial density of 3.10-3....

Embodiment 1

[0038] The present embodiment proposes a method for preparing a zinc oxide varistor sheet, comprising the following steps:

[0039] (1) Preparation of raw materials: prepare according to the molar percentage of raw materials, including zinc oxide main material and various dopants, as follows: zinc oxide: 94.61%, bismuth oxide: 1.5%, antimony oxide: 1.0%, cobalt oxide: 0.8%, manganese oxide: 0.75%, nickel oxide: 1.0%, boron trioxide 0.24%, aluminum nitrate: 0.10%;

[0040] (2) Green body preparation: weigh the raw materials in proportion, pour in deionized water 1.5 times the weight of the powder, add polyacrylic acid ammonia dispersant, set the rotational speed to 2000r / min in the sand mill, and grind at high speed. 1.5h, the mixed slurry was obtained, polyvinyl alcohol binder was added, spray-dried, the dried powder was passed through an 80-mesh sieve, and pressed to an initial density of 3.20g / cm 3 The green zinc oxide varistor sheet;

[0041] (3) Debinding of the green bo...

Embodiment 2

[0047] The present embodiment proposes a method for preparing a zinc oxide varistor sheet, comprising the following steps:

[0048] (1) Preparation of raw materials: prepare according to the molar percentage of raw materials, including zinc oxide main material and various dopants, as follows: zinc oxide: 94.86%, bismuth oxide: 1.5%, antimony oxide: 0.8%, cobalt oxide: 1.0%, manganese oxide: 0.5%, nickel oxide: 1.0%, boron trioxide 0.24%, aluminum nitrate: 0.10%;

[0049] (2) Green body preparation: weigh the raw materials in proportion, pour in deionized water 1.5 times the weight of the powder, add polyacrylic acid ammonia dispersant, set the rotational speed to 2000r / min in the sand mill, and grind at high speed. 1.5h, the mixed slurry was obtained, polyvinyl alcohol binder was added, spray-dried, the dried powder was passed through an 80-mesh sieve, and pressed to an initial density of 3.20g / cm 3 The green zinc oxide varistor sheet;

[0050] (3) Debinding of the green bod...

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Abstract

The invention relates to a preparation method of a zinc oxide varistor sheet. The method includes the steps of: preparing a green body by using zinc oxide as the main material and auxiliary materials including bismuth oxide as raw materials, sealing the green body and then performing microwave sintering, and the microwave sintering process is as follows: heating to 1000-1100° C., Heat preservation for 1-10min; then cool down to 850-900°C, heat-retain for 1-3h, and finally cool to room temperature to obtain a zinc oxide varistor sheet. The method proposed by the invention greatly shortens the sintering time, reduces the energy consumption in the sintering process, and improves the electrical properties such as the voltage gradient and energy tolerance of the zinc oxide varistor sheet.

Description

technical field [0001] The invention relates to the field of electrical materials, in particular to a preparation method of a zinc oxide varistor sheet. Background technique [0002] Due to its excellent nonlinearity and energy tolerance under impact, zinc oxide varistor, as the core component of the arrester, can act instantaneously when lightning strikes power transmission and distribution lines, causing lightning to enter the ground and avoid damage to power equipment. Ensure the safe and stable operation of power lines. [0003] At present, the zinc oxide varistors used in power line arresters are mostly ZnO-Bi 2 O 3 system, mixed with a small amount of various metal oxides, such as Bi 2 O 3 , Co 2 O 3 , MnO 2 , Sb 2 O 3 , NiO, etc., are prepared by traditional ceramic material processes such as mixed grinding, tablet molding, sintering, spray electrodes, and coating insulating layers. Among them, high temperature sintering is the key process that determines th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/453C04B35/622H01C7/112H01C17/00H01C17/28H01C17/30
CPCC04B35/453C04B35/622H01C17/006H01C17/30H01C17/28H01C7/112C04B2235/3298C04B2235/3294C04B2235/3275C04B2235/3262C04B2235/3418C04B2235/3409C04B2235/443
Inventor 陆佳政付志瑶王博闻方针蒋正龙胡建平
Owner STATE GRID HUNAN ELECTRIC POWER
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