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High-potential-gradient zinc oxide piezo-resistive ceramic for lightning arrester

A technology for varistors and lightning arresters, which is applied in the field of zinc oxide varistor ceramics for high-potential gradient arresters. The effect of growth

Inactive Publication Date: 2017-08-08
HUBEI UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current report, SnO 2 Varistors have gradually approached the practical level in terms of low-current performance and high-current performance, but compared with ZnO varistors, the mainstream material of varistors, they have a certain degree of performance, especially in the ability to withstand pulse current shocks. gap

Method used

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  • High-potential-gradient zinc oxide piezo-resistive ceramic for lightning arrester
  • High-potential-gradient zinc oxide piezo-resistive ceramic for lightning arrester
  • High-potential-gradient zinc oxide piezo-resistive ceramic for lightning arrester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The formula of the present embodiment is as follows: nanoscale ZnO 95.8%, Bi 2 o 3 0.7%, MnO 2 0.5%, Sb 2 o 3 1%, Co. 2 o 3 1%, Ni 2 o 3 0.5%, Cr 2 o 3 0.5%.

[0052] Preparation:

[0053] (1) Initial ball milling

[0054] The above molar ratio of Bi 2 o 3 , MnO 2 , Sb 2 o 3 、Co 2 o 3 、Cr 2 o 3 、Ni 2 o 3 Put it in an agate grinding jar, add absolute ethanol as a lubricant, mix well and pour it into a planetary ball mill for wet ball milling for 5 hours.

[0055] (2) Secondary ball milling

[0056] Add nano-sized ZnO into the slurry after grinding in step (1) according to the above molar ratio, perform ball milling for 10 hours twice, and then dry the ground wet slurry at 60° C. to obtain a mixed slurry.

[0057] (3) Pre-sintering

[0058] The above mixed slurry is pre-sintered in a muffle furnace, and the temperature control and time control are as follows:

[0059] From room temperature to 450°C, the heating time is 45min;

[0060] Keep ...

Embodiment 2

[0078] The formula of the present embodiment is as follows: nanoscale ZnO 95.55%, Bi 2 o 3 0.7%, MnO 2 0.5%, Sb 2 o 3 1%, Co. 2 o 3 1%, Cr 2 o 3 0.5%, Ni 2 o 3 0.5%, Lu 2 o 3 0.25%.

[0079] Preparation:

[0080] (1) Initial ball milling

[0081] The above molar ratio of Bi 2 o 3 , MnO 2 , Sb 2 o 3 、Co 2 o 3 、Cr 2 o 3 、Ni 2 o 3 and Lu 2 o 3 Put it in an agate grinding jar, add absolute ethanol as a lubricant, mix well and pour it into a planetary ball mill for wet ball milling for 5 hours.

[0082] (2) Secondary ball milling

[0083] Add nano-sized ZnO into the slurry after grinding in step (1) according to the above molar ratio, perform ball milling for 10 hours twice, and then dry the ground wet slurry at 60° C. to obtain a mixed slurry.

[0084] (3) Pre-sintering

[0085] The above mixed slurry is pre-sintered in a muffle furnace, and the temperature control and time control are as follows:

[0086] From room temperature to 450°C, the hea...

Embodiment 3

[0105] The formula of the present embodiment is as follows: nanoscale ZnO 95.45%, Bi 2 o 3 0.7%, MnO 2 0.5%, Sb 2 o 3 1%, Co. 2 o 3 1%, Cr 2 o 3 0.5%, Ni 2 o 3 0.5%, Lu 2 o 3 0.25%, Tm 2 o 3 0.1%.

[0106] Preparation:

[0107] (1) Initial ball milling

[0108] The above molar ratio of Bi 2 o 3 , MnO 2 , Sb 2 o 3 、Co 2 o 3 、Cr 2 o 3 、Ni 2 o 3 、Tm 2 o 3 and Lu 2 o 3 Put it in an agate grinding jar, add absolute ethanol as a lubricant, mix well and pour it into a planetary ball mill for wet ball milling for 5 hours.

[0109] (2) Secondary ball milling

[0110] Add nano-sized ZnO into the slurry after grinding in step (1) according to the above molar ratio, perform ball milling for 10 hours twice, and then dry the ground wet slurry at 60° C. to obtain a mixed slurry.

[0111] (3) Pre-sintering

[0112] The above mixed slurry is pre-sintered in a muffle furnace, and the temperature control and time control are as follows:

[0113] From room...

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Abstract

The invention provides a high-potential-gradient zinc oxide piezo-resistive ceramic for a lightning arrester. The zinc oxide piezo-resistive ceramic is prepared from the following components in molar percentage: 95.05 to 95.8 percent of nanoscale ZnO, 0.7 percent of Bi2O3, 0.5 percent of MnO2, 1 percent of Sb2O3, 1 percent of Co2O3, 0.5 percent of Cr2O3, 0.5 percent of Ni2O3, 0 to 0.5 percent of Tm2O3 and 0 to 0.25 percent of Lu2O3. A preparation method of the zinc oxide piezo-resistive ceramic comprises the following steps: initial ball milling, second ball milling, pre-sintering, third ball milling, granulating and molding, second sintering and silver-layer coating. The zinc oxide piezo-resistive ceramic for the high-potential-gradient lightning arrester provided by the invention has the advantages of high voltage gradient, low leakage current, large non-linear coefficient and small grain size; zinc oxide piezo-resistive ceramics with different voltage gradients for the lightning arrester can be obtained by adjusting burdening ingredients, proportions and sintering temperature of the ingredients and the like.

Description

technical field [0001] The invention relates to the field of electrical materials, in particular to a zinc oxide varistor ceramic for a high potential gradient arrester. Background technique [0002] Varistors are a class of resistive elements with nonlinear volt-ampere (U-I) characteristics. They have been widely used as overvoltage protectors and voltage limiters in electrical appliances, electronics, construction, communications, military and other fields. [0003] Since 1908, humans have studied the varistor characteristics of silicon carbide (SiC). First, they used the unidirectional conductivity of SiC materials to make current rectifiers. Then in 1930, they prepared SiC arresters. Before the emergence of varistors, it has been an important material for making varistors. [0004] Matsushita Electric Corporation of Japan successfully developed ZnO varistors in 1968, and developed lightning arrester components and high-energy current sinks in 1976 and 1979. ZnO varistor...

Claims

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Application Information

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IPC IPC(8): C04B35/453
CPCC04B35/453C04B2235/3224C04B2235/3241C04B2235/3267C04B2235/3275C04B2235/3279C04B2235/3294C04B2235/3298
Inventor 袁能刘凌云张政军王建王强
Owner HUBEI UNIV OF TECH