High-performance direct-current zinc oxide varistor and preparation process thereof

A technology of zinc oxide resistance chip and preparation process, which is applied in the direction of resistance manufacturing, resistors, varistors, etc., which can solve problems such as thermal collapse, overvoltage and overcurrent load, etc., to suppress volatilization, improve aging life, and improve stability Effect

Active Publication Date: 2016-03-23
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since there is no zero-crossing point in the DC transmission waveform, the serious heating of the resistor sheet during operation may easily lead to thermal collapse and severe overvoltage and overcurrent loads during the commutation process. The requirements for stability and impact resistance are relatively high, and the development of high-performance DC zinc oxide resistors is the most direct and effective solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The invention provides a high-performance DC zinc oxide resistor and a preparation process thereof, comprising the following steps:

[0021] (1) Weigh ZnO93.49mol and Bi respectively 2 o 3 0.9mol, Sb 2 o 3 1mol, Co 2 o 3 0.5mol, SiO 2 0.6mol, MnO 2 0.6mol, Cr 2 o 3 1.5mol, NiO0.2mol, B 2 o 3 0.4mol, Al(NO 3 ) 3 9HO0.06mol, V 2 o 5 0.5mol, CeO 2 0.05mol, silver glass powder 0.2mol, mix well;

[0022] (2) Ball milling in a high-energy ball mill for 5 hours, drying at 90° C. in a blast dryer for 12 hours, and granulating the dry powder with an aqueous solution of polyvinyl alcohol to obtain a resistor powder;

[0023] (3) Under the action of a tablet press, the powder is dry-pressed to make a resistor blank;

[0024] (4) Cover the bismuth-containing oxide on the surface of the resistor sheet blank and carry out high-temperature firing at 1100 ° C for 2.5 hours;

[0025] (5) By spraying Bi 2 o 3 The slurry is evenly coated on the end face of the resistan...

Embodiment 2

[0029] The invention provides a high-performance DC zinc oxide resistor and a preparation process thereof, comprising the following steps:

[0030] (1) Weigh ZnO94.77mol and Bi respectively 2 o 3 0.7mol, Sb 2 o 3 1mol, Co 2 o 3 0.7mol, SiO 2 0.5mol, MnO 2 0.5mol, Cr 2 o 3 0.5mol, NiO0.4mol, B 2 o 3 0.2mol, Al(NO 3 ) 3 9HO0.06mol, V 2 o 5 0.3mol, CeO 2 0.07mol, silver glass powder 0.3mol, mix well;

[0031] (2) Ball milling in a high-energy ball mill for 5 hours, drying at 90° C. in a blast dryer for 12 hours, and granulating the dry powder with an aqueous solution of polyvinyl alcohol to obtain a resistor powder;

[0032] (3) Under the action of a tablet press, the powder is dry-pressed to make a resistor blank;

[0033] (4) Cover the bismuth-containing oxide on the surface of the resistor sheet blank and carry out high-temperature firing at 1050 ° C for 3 hours;

[0034] (5) By spraying Bi 2 o 3 The slurry is evenly coated on the end face of the resistance...

Embodiment 3

[0038] The invention provides a high-performance DC zinc oxide resistor and a preparation process thereof, comprising the following steps:

[0039] (1) Weigh ZnO93.94mol and Bi respectively 2 o 3 0.5mol, Sb 2 o 3 1mol, Co 2 o 3 0.8mol, SiO 2 0.4mol, MnO 20.5mol, Cr 2 o 3 1mol, NiO0.6mol, B 2 o 3 0.3mol, Al(NO 3 ) 3 9HO0.06mol, V 2 o 5 0.4mol, CeO 2 0.1mol, silver glass powder 0.4mol, mix well;

[0040] (2) Ball milling in a high-energy ball mill for 5 hours, drying at 90° C. in a blast dryer for 12 hours, and granulating the dry powder with an aqueous solution of polyvinyl alcohol to obtain a resistor powder;

[0041] (3) Under the action of a tablet press, the powder is dry-pressed to make a resistor blank;

[0042] (4) Cover the bismuth-containing oxide on the surface of the resistor sheet blank and carry out high-temperature firing for 4 hours at 1150 ° C;

[0043] (5) By spraying Bi 2 o 3 The slurry is evenly coated on the end surface of the resistance ...

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Abstract

The invention provides a high-performance direct-current zinc oxide varistor and a preparation process thereof. The varistor is prepared from the following components in parts by mol: 90 to 98 parts of ZnO, 0.5 to 7 parts of Bi2O3, 0.1 to 10 parts of Sb2O3, 0.1 to 2 parts of Co2O3, 0.1 to 5 parts of SiO2, 0.1 to 5 parts of MnO2, 0.1 to 5 parts of Cr2O3, 0.1 to 4 parts of NiO, 0.1 to 1 part of B2O3, 0.01 to 0.6 part of Al(NO3) 3.9HO, 0.01 to 0.5 part of V2O5, 0.01 to 0.5 part of CeO2 and 0.05 to 0.5 part of silver glass powder. According to the varistor and the preparation method thereof, by adding B2O3, V2O5, CeO2 and silver glass powder in a traditional varistor, and by coating a varistor blank surface with bismuth-containing oxide during high-temperature firing and by carrying out direct-current coating and diffusion treatment on the varistor obtained by high-temperature firing according to the preparation process, various performances, such as aging resistance, rectangular wave current impact tolerance stability and large current impact tolerance stability of the varistor can be greatly improved, and the preparation process has the advantages of low cost, high efficiency and the like.

Description

technical field [0001] The invention relates to the technical field of lightning arrester manufacture, in particular to a high-performance DC zinc oxide resistance sheet and a preparation process thereof. Background technique [0002] With the breakthrough of DC transmission technical obstacles, DC transmission project has been widely used in my country's transmission system due to its advantages of large transmission capacity, long transmission distance, and can be used for asynchronous networking of power systems. It can greatly improve the power transmission capacity in Northwest, Southwest, and North China, promote the transformation of local resource advantages into economic advantages, and at the same time meet the power demand and economic development needs of the eastern coastal areas. The DC transmission line arrester is an urgently needed protection component for the DC transmission system, and the DC zinc oxide resistor as a pressure-sensitive ceramic material is ...

Claims

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Application Information

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IPC IPC(8): H01C7/112H01C17/00
CPCH01C7/112H01C17/00
Inventor 万帅陈家宏谷山强王剑吕军冯万兴刘熙曹伟刘新张伟杜雪松
Owner STATE GRID CORP OF CHINA
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