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A kind of direct current zinc oxide varistor sheet and preparation method thereof

A varistor, zinc oxide technology, applied in varistor, resistor manufacturing, overvoltage protection resistors and other directions, can solve the problems of easy splashing, low melting point, heating furnace body pollution, etc., to avoid environmental pollution, chemical performance Excellent, fine-grained effect

Inactive Publication Date: 2011-12-21
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the traditional preparation process, the melting point of bismuth oxide in the components is low, and the reaction is violent during the high-temperature sintering process, which is easy to splash and volatilize, resulting in uneven composition of the prepared resistor sheet, changing the design ratio, and seriously affecting the resistance. The service life and comprehensive electrical properties of the chip, at the same time, it is easy to cause pollution to the heating furnace and the surrounding environment during the preparation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The process and steps of this embodiment are as follows:

[0025] (1) According to molar percentage, the formula is composed of the following raw materials:

[0026] Main material ZnO: 91.4%, nano-Bi 2 o 3 : 2.6%, nickel nitrate: 0.9%,

[0027] SiO 2 : 0.4%, Co 2 o 3 : 1.3%, Al 2 o 3 : 1.7%, Cr 2 o 3 : 1.2%, MnO 2 : 0.5%.

[0028] (2) Weigh nano-Bi according to the molar ratio of the formula (1) 2 o 3 Powder and nickel nitrate; weighing and formulation of nano-Bi 2 o 3 Silver nitrate of the same quality is dissolved in distilled water, then a certain amount of 5% ammonia water is added to prepare silver ammonia solution, and the silver ammonia solution is fixed to a silver nitrate concentration of 0.1mol / L, and finally the nanometer Bi 2 o 3 Add silver ammonia solution to the powder, stir for 2 hours, filter and dry for later use; according to nickel nitrate: trisodium citrate: hydrazine hydrate: ammonium sulfate molar ratio is 1:0.3:0.5:4, take trisodi...

Embodiment 2

[0036]The process and steps of this embodiment are as follows:

[0037] (1) According to molar percentage, the formula is composed of the following raw materials:

[0038] Main material ZnO: 91.1%, nano-Bi 2 o 3 : 2.9%, nickel nitrate: 1.2%,

[0039] SiO 2 : 0.4%, Co 2 o 3 : 1.3%, Al 2 o 3 : 1.7%, Cr 2 o 3 : 0.9%, MnO 2 : 0.5%.

[0040] (2) Weigh nano-Bi according to the molar ratio of the formula (1) 2 o 3 Powder and nickel nitrate; weighing and formulation of nano-Bi 2 o 3 Silver nitrate of the same quality is dissolved in distilled water, then a certain amount of 5% ammonia water is added to prepare silver ammonia solution, and the silver ammonia solution is fixed to a silver nitrate concentration of 0.1mol / L, and finally the nanometer Bi 2 o 3 Add silver ammonia solution to the powder, stir for 2 hours, filter and dry for later use; according to nickel nitrate: trisodium citrate: hydrazine hydrate: ammonium sulfate molar ratio is 1:0.3:0.5:4, take trisodium...

Embodiment 3

[0048] The process and steps of this embodiment are as follows:

[0049] (1) According to molar percentage, the formula is composed of the following raw materials:

[0050] Main material ZnO: 90.5%, nano Bi 2 o 3 : 3.2%, nickel nitrate: 1.4%,

[0051] SiO 2 : 0.4%, Co 2 o 3 : 1.3%, Al 2 o 3 : 1.5%, Cr 2 o 3 : 1.2%, MnO 2 : 0.5%.

[0052] (2) Weigh nano-Bi according to the molar ratio of the formula (1) 2 o 3 Powder and nickel nitrate; weighing and formulation of nano-Bi 2 o 3 Silver nitrate of the same quality is dissolved in distilled water, then a certain amount of 5% ammonia water is added to prepare silver ammonia solution, and the silver ammonia solution is fixed to a silver nitrate concentration of 0.1mol / L, and finally the nanometer Bi 2 o 3 Add silver ammonia solution to the powder, stir for 2 hours, filter and dry for later use; according to nickel nitrate: trisodium citrate: hydrazine hydrate: ammonium sulfate molar ratio is 1:0.3:0.5:4, take trisodiu...

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Abstract

The invention relates to a direct-current zinc oxide varistor sheet and a preparation method thereof, and belongs to the technical field of varistor ceramic material manufacturing for lightning arresters. Its characteristic is that ZnO is used as the main material, supplemented with additives such as nano-Bi2O3, nickel nitrate, Co2O3, etc., and the nano-Bi2O3 and nickel nitrate are firstly prepared into a coated nano-powder in the solution. The main ingredient ZnO in the formula and other trace raw materials except nano-Bi2O3 and nickel nitrate are mixed evenly and then sintered, and the upper and lower surfaces of the resistance sheet prepared by sintering are coated with the coated Bi2O3 powder slurry prepared in advance, heated and sintered, and the electrode is coated , coating a high-resistance layer to produce a DC zinc oxide resistor. During the preparation process of the method, the ratio change and environmental pollution caused by the volatilization and splashing of Bi2O3 are avoided, and the prepared resistive sheet has uniform composition and excellent comprehensive electrical properties.

Description

technical field [0001] The invention relates to a direct-current zinc oxide varistor sheet and a preparation method thereof, and belongs to the technical field of varistor ceramic material manufacturing for lightning arresters. Background technique [0002] Zinc oxide varistor is a functional composite ceramic material, which is widely used in lightning arresters for protection equipment in power transmission systems due to its good resistance nonlinearity, large flow capacity, and small leakage current. It is used to absorb the overvoltage energy of the power transmission line and limit the overvoltage amplitude. [0003] Zinc oxide varistors are mainly made of zinc oxide as the main raw material, adding bismuth oxide, cobalt oxide, nickel oxide, chromium oxide and other additives, and then prepared through mixed pressing, high-temperature sintering and other processes. The process is relatively simple. However, in the traditional preparation process, the melting point of ...

Claims

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Application Information

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IPC IPC(8): H01C7/12H01C17/00
Inventor 钟庆东张磊蒋继波朱振宇罗检
Owner SHANGHAI UNIV
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