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Zinc oxide piezoresistor preparation method based on chemical deposition method

A varistor and zinc oxide technology, applied in varistors, varistor cores, resistance manufacturing, etc., can solve the problems of low electrical performance of ZnO varistors and inability to apply UHV arresters, etc., and achieve easy Effects of low cost control, reduction of impurity ions, and improvement of electrical properties

Pending Publication Date: 2022-03-04
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent improves the doping and sintering temperature processes in the preparation process of ZnO varistors. Although the uniformity of the microstructure of ZnO resistors is improved to a certain extent, the electrical resistance of the ZnO varistors prepared by this patent is The performance is relatively low and cannot be applied to UHV arresters

Method used

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  • Zinc oxide piezoresistor preparation method based on chemical deposition method
  • Zinc oxide piezoresistor preparation method based on chemical deposition method
  • Zinc oxide piezoresistor preparation method based on chemical deposition method

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A method for preparing a zinc oxide varistor based on a chemical precipitation method, comprising the following steps:

[0034] (1) Weighing raw materials: use an electronic balance with an accuracy of 0.001g to weigh the various components of the raw materials, specifically: 86.36g ZnO, 11.42g Bi(NO 3 ) 3 ·5H 2 O, 0.6g Co(NO 3 ) 2 ·6H 2 O, 0.02g Cr(NO 3 ) 3 9H 2O, 0.49gMn((NO 3 )·4H 2 O, 0.36g Ni((NO 3 ) 2 ·6H 2 O and 0.75 g SbCl 3 ;

[0035] (2) chemical precipitation mixing: keep the total volume of the reaction solution at 800ml constant, dissolve the raw materials weighed in the step (1) with 533.3ml ethylene glycol, form a mixed solution, stir continuously with a magnetic stirrer, and heat simultaneously to 90°C; then dissolve 5g NaOH with 266.6ml of deionized water, and drop the NaOH solution into the mixed solution at a certain rate until the pH in the mixed solution is maintained at 10, react for 2 hours and carry out precipitation filtration, and...

Embodiment 2

[0043] A method for preparing a zinc oxide varistor based on a chemical precipitation method, comprising the following steps:

[0044] (1) Weighing raw materials: use an electronic balance with an accuracy of 0.001g to weigh the various components of the raw materials, specifically: 86.36g ZnO, 11.42g Bi(NO 3 ) 3 5H2O, 0.6g Co(NO 3 ) 2 ·6H 2 O, 0.02g Cr(NO 3 ) 3 9H 2 O, 0.49gMn((NO 3 )·4H 2 O, 0.36g Ni((NO 3 ) 2 ·6H 2 O and 0.75 g SbCl 3 ;

[0045] (2) chemical precipitation mixing: keep the total volume of the reaction solution at 800ml constant, dissolve the raw materials weighed in the step (1) with 524.1ml ethylene glycol, form a mixed solution, stir continuously with a magnetic stirrer, and heat simultaneously to 80°C; then dissolve 5g NaOH with 275.9ml of deionized water, and drop the NaOH solution into the mixed solution at a certain rate until the pH in the mixed solution is maintained at 9, react for 2 hours and carry out precipitation filtration, and the...

Embodiment 3

[0053] (1) Weighing raw materials: use an electronic balance with an accuracy of 0.001g to weigh the various components of the raw materials, specifically: 86.36g ZnO, 11.42g Bi(NO 3 ) 3 5H2O, 0.6g Co(NO 3 ) 2 ·6H 2 O, 0.02g Cr(NO 3 ) 3 9H 2 O, 0.49gMn((NO 3 )·4H 2 O, 0.36g Ni((NO 3 ) 2 ·6H 2 O and 0.75 g SbCl 3 ;

[0054] (2) chemical precipitation mixing: keep the total volume of the reaction solution at 800ml constant, dissolve the raw materials weighed in the step (1) with 541.9ml ethylene glycol, form a mixed solution, stir continuously with a magnetic stirrer, and heat simultaneously to 85°C; then dissolve 5g NaOH with 258.1ml deionized water, and drop the NaOH solution into the mixed solution at a certain rate until the pH in the mixed solution is maintained at 9.5, and carry out precipitation filtration after 2 hours of reaction, and then Wash the sediment several times with deionized water to obtain a mixed slurry for later use;

[0055] (3) Drying and s...

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Abstract

The invention discloses a zinc oxide piezoresistor preparation method based on a chemical deposition method, which comprises the following steps: S1, dissolving weighed raw materials with ethylene glycol to form a mixed solution, dropwise adding a NaOH solution into the mixed solution to obtain a precipitate, and filtering and washing the precipitate; s2, drying the precipitate in a drying machine, grinding after drying, and sieving with a 60-mesh sieve; s3, adding a polyvinyl alcohol aqueous solution into the precipitate, mixing, drying, grinding, sieving with a 60-mesh sieve, and granulating; s4, spraying deionized water into the granulated powder, uniformly shaking, standing and tabletting; s5, sintering the tablet, and cooling to room temperature to obtain a sample; s6, performing fine grinding on the sample, performing ultrasonic cleaning on the sample in an ultrasonic cleaning machine, and drying; and S7, coating the surface of the dried sample with a gold electrode to obtain the zinc oxide varistor. According to the preparation method disclosed by the invention, uniform mixing of the ZnO powder and the doped metal oxide is effectively realized, so that the ZnO varistor is more uniform in microscopic grain structure and more excellent in electrical property, and can meet the development requirements of an extra-high voltage power grid.

Description

technical field [0001] The invention belongs to the technical field of preparation of electronic ceramic devices, and in particular relates to a method for preparing a zinc oxide varistor based on a chemical deposition method. Background technique [0002] ZnO varistor is a functional ceramic material mainly composed of ZnO powder and sintered with a small amount of various metal oxides. It has the advantages of high nonlinear index, high transient energy absorption capacity, and low raw material price. ZnO varistors can maintain a small electrical conductivity or dielectric constant under the action of a low electric field, which is equivalent to an insulating material. To achieve effective modulation of the uneven distribution of the electric field in space. Surge arresters based on ZnO varistors are widely used in power system transient overvoltage protection, contact arc suppression and voltage stabilization at various voltage levels to protect electrical equipment from...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453C04B35/622C04B35/64C04B41/88H01C7/112H01C17/28H01C17/30
CPCC04B35/453C04B35/622C04B35/64C04B41/5116C04B41/88C04B41/009H01C17/288H01C17/30H01C7/112C04B2235/443C04B2235/444C04B2235/96C04B2235/3298C04B2235/3267C04B2235/3275C04B2235/3241C04B2235/3294C04B41/4543
Inventor 董曼玲程思远张科郭磊张洋姚伟郭培王超凡张小旋赵贤根何俊佳许贺军赵明鲁永郭洁刘文凤
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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