A high-gradient zno varistor ceramic material without bi, pr, v and its preparation method

A pressure-sensitive ceramic and high-gradient technology, which is applied in the field of pressure-sensitive ceramic materials, can solve problems such as performance deterioration, low storage capacity, and impact on stable performance, and achieve the goal of increasing nonlinear coefficients, increasing varistor voltage, and excellent comprehensive performance. Effect

Active Publication Date: 2021-11-02
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the potential gradient of most ZnO varistors developed in my country is around 300 V / mm, which cannot meet the application requirements of miniaturization.
[0004] In addition, the current ZnO varistor ceramics mainly contain ZnO / Bi 2 o 3 system, ZnO / Pr 6 o 11 system, ZnO / V 2 o 5 system, ZnO / BaO system, but these types of materials have the following problems: (1) At high temperature, Bi 2 o 3 It will volatilize a lot. During the cooling process, the rich Bi with low eutectic melting point 2 o 3 Due to the poor wettability of the liquid phase with the ZnO crystal grains, the crystallization at the intersection of polycrystals has a certain impact on the stability; (2) Pr 6 o 11 The price is expensive, and there is less storage on the earth, which is not conducive to industrial production; (3) V 2 o 5 It has high toxicity and is not conducive to industrial production. In addition, ZnO / V 2 o 5 (4) ZnO / BaO series varistor ceramics, although its modified additives are non-toxic and cheap, but the performance of the varistor ceramics in this system is unstable, Its performance will deteriorate over time, mainly because BaO will react with moisture and gas in the air, making its performance decline
[0005] Although Patent Document 1 (Chinese Publication No. CN106747404A) discloses a novel ZnO varistor ceramic material without Bi, Pr, V, the varistor voltage of the resulting zinc oxide varistor is not high, ranging from 360 to 700 V / mm, cannot meet the application requirements of the development of the transmission and transformation voltage in the direction of ultra-high voltage and ultra-high voltage, and the development of electronics and circuits in the direction of ultra-integration and miniaturization. Therefore, it is necessary to develop high-gradient ZnO varistor ceramic materials

Method used

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  • A high-gradient zno varistor ceramic material without bi, pr, v and its preparation method
  • A high-gradient zno varistor ceramic material without bi, pr, v and its preparation method
  • A high-gradient zno varistor ceramic material without bi, pr, v and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The formula for this example is as follows: ZnO (97.56 mol%), CaCO 3 (2mol%), Co 2 O 3 (0.33mol%), Cr 2 O 3 (0.1mol%), Sb 2 O 3 (0.01mol%);

[0044] Put the above materials together into a nylon tank, use zirconia balls or stainless steel balls, and perform wet grinding in a planetary ball mill with water as a medium, the speed is 500rpm, the material-to-ball ratio is 10:1, and the ball is milled for 8h; the slurry is dried at 120 ℃. After drying, calcined at 450 °C for 2 hours to obtain composite powder; then added 10% PVA binder, artificially granulated, and then pressed a green body with a diameter of 12 mm; / min was raised to 1200°C, kept for 3 hours and then cooled in the furnace to obtain dense ZnO ceramic materials. A zinc oxide varistor ceramic material with a varistor voltage of 650 V / mm, a nonlinear coefficient of 52 and a leakage current of 0.1 μA can be obtained.

Embodiment 2

[0046] The formula for this example is as follows: ZnO (97.47 mol%), CaCO 3 (2mol%), Co 2 O 3 (0.33mol%), Cr 2 O 3 (0.1mol%), Sb 2 O 3 (0.1 mol%);

[0047] The experimental conditions were operated as described in Example 1, and a zinc oxide varistor ceramic material with a varistor voltage of 880 V / mm, a nonlinear coefficient of 67 and a leakage current of 0.1 μA could be obtained.

Embodiment 3

[0049] The formula for this example is as follows: ZnO (97.42 mol%), CaCO 3 (2mol%), Co 2 O 3 (0.33mol%), Cr 2 O 3 (0.1mol%), Sb 2 O 3 (0.15mol%);

[0050] The experimental conditions are operated as described in Example 1, and a zinc oxide varistor ceramic material with a varistor voltage of 1230 V / mm, a nonlinear coefficient of 165 and a leakage current of 0.1 μA can be obtained.

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Abstract

The invention relates to a high-gradient ZnO varistor ceramic material free of Bi, Pr and V and a preparation method thereof. The high-gradient zinc oxide varistor ceramic material is composed of zinc oxide and modified additives, wherein the content of zinc oxide is 87.5 ~99.69mol%, the content of the modified additive is 0.31~12.5mol%, and the sum of the molar content is 100mol%; the composition of the modified additive except CaCO 3 、Co 2 o 3 、Cr 2 o 3 and La 2 o 3 In addition, it also contains Sb 2 o 3 ; the Sb 2 o 3 The molar content of 0.01 ~ 1 mol%.

Description

technical field [0001] The invention relates to a high-gradient zinc oxide (ZnO) pressure-sensitive ceramic material without Bi, Pr, V, Ba, etc. and a preparation method thereof, belonging to the technical field of pressure-sensitive ceramic materials. Background technique [0002] Compared with traditional surge arresters, ZnO varistors have excellent electrical properties such as large nonlinear coefficient, fast response time, and strong flow capacity, and the process is simple. Therefore, ZnO varistors quickly become the leading material for making varistors, and are widely used in communications, electric power, transportation, industrial control, automotive electronics, medical equipment and household appliances. [0003] In recent years, with the development of transmission and transformation voltage towards ultra-high voltage and ultra-high voltage and the development of electronics and circuits towards ultra-integration and miniaturization, it is particularly urgent...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C04B35/453
CPCC04B35/453C04B2235/3227C04B2235/3241C04B2235/3275C04B2235/3294C04B2235/442C04B2235/96
Inventor田甜李国荣郑嘹赢曾江涛阮学政
OwnerSHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI