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Copper-electrode zinc-oxide voltage-sensitive resistor and preparation method thereof

A technology of varistors and copper electrodes, which is applied in the manufacture of varistors, resistors, and resistors, can solve problems such as the deterioration of the electrical properties of varistors and the destruction of the grain boundary barrier of varistor semiconductor components, and achieve product The effect of low cost and saving production cost

Active Publication Date: 2012-01-18
GUANGDONG FENGHUA ADVANCED TECH HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, copper paste is used to make the electrodes of varistors, and the atmosphere environment of the infiltration cannot adopt the normal atmospheric environment. On the other hand, the control of infiltration temperature is also critical. If it is too high, the grain boundary potential of the varistor will be destroyed. barrier, resulting in severe deterioration of the electrical performance of the varistor

Method used

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  • Copper-electrode zinc-oxide voltage-sensitive resistor and preparation method thereof
  • Copper-electrode zinc-oxide voltage-sensitive resistor and preparation method thereof
  • Copper-electrode zinc-oxide voltage-sensitive resistor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] This example is the production process of 20K821 copper electrode zinc oxide varistor with a diameter of φ20mm. The steps are as follows:

[0020] First make the pressure-sensitive ceramic body according to the traditional varistor sintering process, and then use a 200 mesh screen to print on the pressure-sensitive ceramic body with a copper content of 70%-75% and a firing temperature of 520-600°C on the pressure-sensitive ceramic body with a thickness of 8-10 μm. Low-temperature copper paste for zinc oxide varistors (can be purchased from the market), and then use a general chain-belt drying furnace. Minute process for drying. Then, after installing it with a screen, put it into a chain-type nitrogen atmosphere protection tunnel electric furnace dedicated to zinc oxide varistors, such as a tunnel furnace with a model BHTDL-100 designed by Xinbaohua Electronic Equipment Company. Copper electrodes. The process parameters of the infiltration process are shown in Table 1...

Embodiment 2

[0026] This example is the production process of 10K471 copper electrode zinc oxide varistor with a diameter of φ10mm, including the following steps:

[0027] First make the pressure-sensitive ceramic body according to the traditional varistor sintering process, and then use a 200 mesh screen to print on the pressure-sensitive ceramic body with a copper content of 70%-75% and a firing temperature of 520-600°C on the pressure-sensitive ceramic body with a thickness of 8-10 μm. Low-temperature copper paste for zinc oxide varistors (can be purchased from the market), and then use a general chain-belt drying furnace. Minute process for drying. Then, after installing it with a screen, put it into a chain belt type nitrogen atmosphere protection tunnel electric furnace dedicated to zinc oxide varistors and burn infiltrated copper electrodes. The process parameters of the infiltration process are as follows:

[0028]

[0029] The entire infiltration process is carried out in an ...

Embodiment 3

[0032] This example is the production process of 7K271 copper electrode zinc oxide varistor with a diameter of φ7mm, including the following steps:

[0033] First make the pressure-sensitive ceramic body according to the traditional varistor sintering process, and then use a 200 mesh screen to print on the pressure-sensitive ceramic body with a copper content of 70%-75% and a firing temperature of 520-600°C on the pressure-sensitive ceramic body with a thickness of 8-10 μm. Low-temperature copper paste for zinc oxide varistors (can be purchased from the market), and then use a general chain-belt drying furnace. Minute process for drying. Then, after installing it with a screen, put it into a chain belt type nitrogen atmosphere protection tunnel electric furnace dedicated to zinc oxide varistors and burn infiltrated copper electrodes. The process parameters of the infiltration process are as follows:

[0034]

[0035] The entire infiltration process is carried out in an al...

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Abstract

The invention discloses a preparation method of a copper-electrode zinc-oxide voltage-sensitive resistor, which comprises the following steps of: voltage-sensitive ceramic-body manufacture, copper-electrode slurry printing, copper-electrode drying and copper-electrode sintering and permeation, wherein the copper-electrode sintering and permeation are carried out under an oxygen-free atmosphere environment by adopting a chain-belt type tunnel electric furnace as production equipment. In the invention, the copper-electrode zinc-oxide voltage-sensitive resistor with qualified performances is manufactured by replacing noble-metal silver with base-metal copper as an electrode material and using special electrode sintering and permeating processes, so that the production cost is greatly saved. The preparation method has the following advantages that: 1. the process technology is suitable for the mass production of the copper-electrode zinc-oxide voltage-sensitive resistors; 2. all the electrical performances (comprising voltage nonlinear coefficient, leakage current, through-current capacity, energy tolerance and the like) of a product produced through the process technology can reach the level equivalent to a silver-electrode product, and the requirements of clients are met; and 3. the cost of the product is much lower than that of the silver-electrode product in the same specification.

Description

technical field [0001] The invention relates to the technical field of zinc oxide varistors with copper electrodes. Background technique [0002] Zinc oxide varistor is a semiconductor ceramic element made of zinc oxide as the main material, which is sintered at high temperature under normal atmospheric environment after semiconducting doping. Zinc oxide varistors widely used in the industry are still silver electrode components. The component has excellent voltage non-linear characteristics and the ability to withstand high-energy shocks. It is mainly used in household appliances, communications, industrial power supplies, lighting, automobiles and other fields, and plays the role of lightning protection and overvoltage protection. Since silver is a precious metal material, using it as an electrode material will inevitably increase the cost of the product, so consider other metal materials to replace silver as an electrode, such as copper. The electrode of the varistor is...

Claims

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Application Information

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IPC IPC(8): H01C7/10H01C1/142H01C17/00H01C17/28
Inventor 梁戈仁邓佩佳袁冬梅
Owner GUANGDONG FENGHUA ADVANCED TECH HLDG
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