Chromium-free and lead-free mesohigh-voltage zinc oxide piezoresistive material and preparation method thereof

A varistor, medium and high voltage technology, applied in the field of chromium-free, lead-free, medium and high voltage zinc oxide varistor materials and their preparation fields, can solve the problems of large leakage current and low nonlinear coefficient, and achieve stable varistor voltage, high resistance to The effect of strong pulse current capability and simple process

Active Publication Date: 2012-03-28
GUANGXI NEW FUTURE INFORMATION IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A chromium-free and lead-free varistor patent published in 2009, the publication number is CN101613199, has a large leakage current and a low nonlinear coefficient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method of a chrome-free lead-free medium-high voltage zinc oxide varistor material is carried out according to the following steps:

[0026] 1. First, 25kg Zn(CH 3 COO) 2 2H 2 O was dissolved in 20kg of deionized water, 19.38L of tetra-n-butyl titanate, 0.6L of ethanol and 1.1L of acetic acid were added in sequence, and stirred continuously to form a sol.

[0027] 2. Add ammonia water drop by drop until the pH value reaches 7.5-8.5 to form a gel, dry it in vacuum, then put the dry gel into a resistance furnace, raise it to 750°C at a rate of 10°C / min, and calcinate it for 6 hours, that is Nanoscale spinel Zn available 2 TiO 4 Powder.

[0028] 3. The analytically pure raw material Bi with a purity of more than 99% 2 o 3 、Co 3 o 4 , Sb 2 o 3 , MnCO 3 、Ni 2 o 3 、H 3 BO 3 , SiO 2 and the nano-spinel Zn in step 2 2 TiO 4The powder is weighed and formulated into 20 kg of varistor additives according to the molar ratio of 1.32:1.25:2.65:1.14:0....

Embodiment 2

[0037] A preparation method of a chrome-free lead-free medium-high voltage zinc oxide varistor material is carried out according to the following steps:

[0038] 1. First, 25kg Zn(CH 3 COO) 2 2H 2 O was dissolved in 20kg of deionized water, 19.38L of tetra-n-butyl titanate was added in turn, and then 0.61L of ethanol and 1.1L of acetic acid were added, stirring continuously to form a sol.

[0039] 2. Add ammonia water drop by drop until the pH value reaches 7.5-8.5 to form a gel, dry it in vacuum, then put the dry gel into a resistance furnace, raise it to 750°C at a rate of 10°C / min, and calcinate it for 6 hours, that is Nanoscale spinel Zn available 2 TiO 4 Powder.

[0040] 3. The analytically pure raw material Bi with a purity of more than 99% 2 o 3 、Co 3 o 4 , Sb 2 o 3 , MnCO 3 、Ni 2 o 3 、H 3 BO 3 , SiO 2 and the nano-spinel Zn in step 2 2 TiO 4 The powder is weighed and formulated into 20 kg of varistor additives according to the molar ratio of 1.87: 1....

Embodiment 3

[0049] A preparation method of a chrome-free lead-free medium-high voltage zinc oxide varistor material is carried out according to the following steps:

[0050] 1. First, 25kg Zn(CH 3 COO) 2 2H 2 O was dissolved in 20kg of deionized water, and 19.38L of tetra-n-butyl titanate was added according to the molar percentage, then 0.6L of ethanol and 1L of acetic acid were added, and stirred continuously to form a sol.

[0051] 2. Add ammonia water drop by drop until the pH value reaches 7.5-8.5 to form a gel, dry it in vacuum, then put the dry gel into a resistance furnace, raise it to 750°C at a rate of 10°C / min, and calcinate it for 6 hours, that is Nanoscale spinel Zn available 2 TiO 4 Powder.

[0052] 3. Will analyze the pure raw material Bi 2 o 3 、Co 3 o 4 , Sb 2 o 3 , MnCO 3 、Ni 2 o 3 、H 3 BO 3 , SiO 2 and the nano-spinel Zn in step 2 2 TiO 4 The powder is weighed and prepared into 20kg varistor additive according to the molar ratio of 2.01: 1.35: 2: 1.45:...

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Abstract

The invention discloses a chromium-free and lead-free mesohigh-voltage zinc oxide piezoresistive material and a preparation method thereof. The chromium-free and lead-free mesohigh-voltage zinc oxide piezoresistive material is prepared by taking ZnO as a matrix and properly adding additives, such as Bi2O3, Co3O4, Sb2O3, MnCO3, Ni2O3, H3BO3, Al(NO3)3, AgNO3, SiO2, and nanoscale spinel Zn2TiO4. Thepreparation method comprises the steps of: independently preparing powder of the nanoscale spinel Zn2TiO4 by adopting a sol-gel method, then performing ball-milling mixing, spraying granulating, dry-pressing molding, glue removing, sintering and other working procedures on the powder of the nanoscale spinel Zn2TiO4 and other additives as well as ZnO to obtain a well sintered ceramic chip, and performing silver printing, reducing, welding and packaging on the well sintered ceramic chip to obtain a chromium-free and lead-free mesohigh-voltage zinc oxide piezoresistor. The chromium-free and lead-free mesohigh-voltage zinc oxide piezoresistive material disclosed by the invention has the advantages of simple processes in the preparation method, environment friendliness, strong pulse current resistance, excellent energy tolerance and excellent thermal stability, and can be produced in large scale.

Description

technical field [0001] The invention relates to the field of varistor materials, in particular to a chromium-free lead-free medium-high voltage zinc oxide varistor material and a preparation method thereof. Background technique [0002] Zinc oxide varistors are mainly ZnO-based, adding a small amount of metal oxides, forming and sintering voltage nonlinear electronic components. It has a symmetrical and steep breakdown characteristic. When a high instantaneous overvoltage is applied to the circuit, the impedance of the varistor changes sharply from a state close to an open circuit to a high conduction state, suppressing the instantaneous overvoltage to a safe voltage. level, thus the fragile components in the circuit are protected. [0003] In recent years, with the rapid development of electronic information, people's requirements for the performance of ZnO varistor ceramics have been continuously improved. In order to improve the varistor performance of zinc oxide, Cr, P...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C04B35/453C04B35/622
Inventor常宝成褚冬进覃远东梁自伟周军伟
OwnerGUANGXI NEW FUTURE INFORMATION IND