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A kind of ultra-high gradient zinc oxide varistor and its preparation method

A varistor and zinc oxide technology, applied in varistors, varistor cores, etc., to achieve the effects of strong combined wave resistance, good aging performance, and high energy tolerance

Active Publication Date: 2019-05-21
GUANGXI NEW FUTURE INFORMATION IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the above-mentioned defects in the prior art, and to ensure the uniform growth of zinc oxide crystal grains in the sintering process of the green body through the high-density powder particle manufacturing technology and the high-uniformity green body forming technology, and to The technology realizes the uniformity of the sintering temperature and the control of the internal atmosphere of the sagger, ensures the consistency of the surface and internal growth of the green body, effectively overcomes the intrinsic defects caused by the abnormal grain growth of the product, and achieves high flux and high energy tolerance. Jiahua, developed an ultra-high gradient zinc oxide varistor and its preparation method

Method used

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  • A kind of ultra-high gradient zinc oxide varistor and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0024] An ultra-high gradient zinc oxide varistor and a preparation method thereof are carried out according to the following steps:

[0025] 1. First weigh the analytically pure raw material Co with a purity ≥99% 3 o 4 461.2727 grams, Sb 2 o 3 951.6044 g, MnCO 3 186.3170 grams, Bi 2 o 3 472.0446 grams, Ni 2 o 3 193.6075 grams, ZrO 2 17.7816 grams, SiO 2 20.2882 grams, Y 2 o 3 162.6731 g, SnO 2 33.9285 grams into the ball mill jar, then add 8 kilograms of zirconium balls, 2.5 kilograms of deionized water and 49 grams of dispersant, wet ball mill and mix for 4 hours, and configure it as an ultra-high gradient varistor additive;

[0026] 2. Weigh 22.9996 grams of Ba(CH 3 COO) 2 , 4.2225 grams of Al (NO 3 ) 3 9H 2 O, 5.7363 g AgNO 3 and 2.7839 g H 3 BO 3 , add 200 grams of deionized water to dissolve it completely, and configure it as an additive solution; weigh 17464.7399 grams of analytically pure raw material ZnO with a purity ≥ 99%, put it into a st...

Embodiment 2

[0035] An ultra-high gradient zinc oxide varistor and a preparation method thereof are carried out according to the following steps:

[0036] 1. First weigh the analytically pure raw material Co with a purity ≥99% 3 o 4 499.5488 grams, Sb 2 o 3 1138.0000 g, MnCO 3 217.9489 grams, Bi 2 o 3 467.7338 grams, Ni 2 o 3 184.4610 g, ZrO 2 13.7436 g, SiO 2 20.1029 grams, Y 2 o 3 176.2989 grams, SnO 2 Put 26.8949 grams into the ball mill jar, then add 9 kilograms of zirconium balls, 3 kilograms of deionized water and 50 grams of dispersant, wet ball mill and mix for 6 hours, and configure it as an ultra-high gradient varistor additive;

[0037] 2. Weigh 28.4870 grams of Ba(CH 3 COO) 2 , 4.1840 g Al(NO 3 ) 3 9H 2 O, 3.7893 g AgNO 3 and 3.4481 g H 3 BO 3 , add 200 grams of deionized water to dissolve it completely, and configure it as an additive solution; weigh 17215.3588 grams of analytically pure raw material ZnO with a purity ≥ 99%, put it into a stirring ...

Embodiment 3

[0046] An ultra-high gradient zinc oxide varistor and a preparation method thereof are carried out according to the following steps:

[0047] 1. First weigh the analytically pure raw material Co with a purity ≥99%3 o 4 509.3723 grams, Sb 2 o 3 1116.4758 g, MnCO 3 217.5562 grams, Bi 2 o 3 539.5184 grams, Ni 2 o 3 158.3506 g, ZrO 2 27.4376 g, SiO 2 16.0534 grams, Y 2 o 3 150.8410 g, SnO 2 Put 33.5581 grams into the ball mill jar, then add 9 kilograms of zirconium balls, 3 kilograms of deionized water and 49 grams of dispersant, wet ball mill and mix for 8 hours, and configure it as an ultra-high gradient varistor additive;

[0048] 2. Weigh 8.5307 grams of Ba(CH 3 COO) 2 , 16.7058 grams of Al (NO 3 ) 3 9H 2 O, 18.9122 g AgNO 3 and 6.8837 g H 3 BO 3 , add 200 grams of deionized water to dissolve it completely, and configure it as an additive solution; weigh 17179.8043 grams of analytically pure raw material ZnO with a purity ≥ 99% and put it into a sti...

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Abstract

The invention discloses an ultra-high gradient zinc oxide varistor and a preparation method thereof. The varistor is manufactured from the following analytically pure raw materials: ZnO, Co 3 o 4 , Sb 2 o 3 , MnCO 3 、 Bi 2 o 3 、Ni 2 o 3 , ZrO 2 , SiO 2 , Y 2 o 3 , SnO 2 , Ba(CH 3 COO) 2 , Al(NO 3 ) 3 9H 2 O, AgNO 3 、H 3 BO 3 After mixing by ball milling and spray granulation, select 20%~30% to be directly used for debinding and sintering to form roasted granules, and the rest is pre-dried and pressed to form, mechanically pulverized and re-granulated, sieved by a vibrating sieve, and selected according to the proportion of particle size The powder particles are fully mixed, dry-pressed, glue-removed, stacked in sequence, and a small amount of roasted particles are sprinkled between the green body and the green body. Finally, the roasted particles are buried and fired to obtain a sintered ceramic piece, and then ground, Drying, silver screen printing, reduction, welding, and encapsulation to obtain an ultra-high gradient zinc oxide varistor. The manufacturing method of the invention has simple process, and the prepared piezoresistor has strong flow resistance, long standby life and high energy density.

Description

technical field [0001] The invention relates to an ultra-high gradient zinc oxide varistor and a preparation method thereof, belonging to the technical field of varistor manufacturing. Background technique [0002] In today's era of rapid development of electronic information technology, ZnO varistors have been widely used as overvoltage protectors in electrical appliances, electronics, construction, communications and military fields. The market prospect is very broad. After more than 50 years of development and research, commercial zinc oxide varistor gradients can be achieved in dozens of series from 5 to 400V / mm, which can be applied from low-voltage integrated circuits to high-voltage / ultra-high-voltage power transmission and transformation systems. The diameter of the components can also range from 5 to 136mm, and the maximum flow capacity can reach 7.5kA / cm 2 , the average pulse energy tolerance can reach 300J / cm 3 , up to 750J / cm 3 . In recent years, miniaturizat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/453C04B35/64H01C7/112
CPCC04B35/453C04B35/64C04B2235/3217C04B2235/3225C04B2235/3244C04B2235/3262C04B2235/3275C04B2235/3279C04B2235/3291C04B2235/3293C04B2235/3294C04B2235/3298C04B2235/3409C04B2235/3418H01C7/112
Inventor 覃远东廖莘孟凡志黄绍芬
Owner GUANGXI NEW FUTURE INFORMATION IND
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