ZnO varistor ceramic additive as well as preparation method and application thereof

A technology of varistor ceramics and additives, which is applied in the field of varistor ceramic additives and its preparation, and can solve problems such as reducing the nonlinear coefficient of varistors and increasing the sintering temperature

Active Publication Date: 2018-11-23
LIAOCHENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in general, oxide additives that promote grain growth will reduce the nonlinear coefficient of varistors or increase their sintering temperature to varying degrees.

Method used

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  • ZnO varistor ceramic additive as well as preparation method and application thereof
  • ZnO varistor ceramic additive as well as preparation method and application thereof
  • ZnO varistor ceramic additive as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 ZnO and Sb 2 o 3 The molar ratio is 14:1

[0030] 1) Combine ZnO and Sb 2 o 3 Using absolute ethanol as the medium ball mill for 4h to obtain the slurry, in which ZnO and Sb 2 o 3 The molar ratio is 14:1;

[0031] 2) After drying the slurry obtained in step 1), grind it into a crucible for calcination, wherein the drying temperature is 80°C, the drying time is 8h, the calcination temperature is 750°C, and the calcination time is 10h;

[0032] 3) Grinding the calcined powder and sieving through a 60-mesh sieve to obtain the ZnO pressure-sensitive ceramic additive.

[0033] To (97at%-x)ZnO-(1at%)Bi 2 o 3 -(0.5at%)Sb 2 o 3 -(0.5at%)MnO 2 -(0.5at%) Co 2 o 3 -(0.5at%)Cr 2 o 3 X (x=0at%, 0.1at%, 0.3at%, 0.5at%) amount of ZnO varistor ceramic additives are respectively added to the initial powder of the system varistor ceramics. Weigh raw materials according to the stoichiometric ratio in the above general formula of ingredients: ZnO, Bi 2 o 3 , Sb ...

Embodiment 2

[0038] Example 2 ZnO and Sb 2 o 3 The molar ratio is 14:1

[0039] 1) Combine ZnO and Sb 2 o 3 Using absolute ethanol as the medium ball mill for 4h to obtain the slurry, in which ZnO and Sb 2 o 3 The molar ratio is 14:1;

[0040] 2) Dry the slurry obtained in step 1) and grind it, then press the powder into a large piece and put it into a crucible for calcination, wherein the drying temperature is 120°C, the drying time is 8h, and the calcination temperature is 850°C. Calcination time is 12h;

[0041] 3) Grinding the calcined powder and sieving through a 60-mesh sieve to obtain the ZnO pressure-sensitive ceramic additive.

[0042] To (97.5at%-x)ZnO-(1at%)Bi 2 o 3 -(0.5at%)Sb 2 o 3 -(0.5at%)MnO 2 -(0.5at%) Co 2 o 3 X (x=0at%, 0.2at%, 0.4at%, 0.6at%) amount of ZnO varistor ceramic additives are respectively added to the initial powder of the system varistor ceramics. Weigh raw materials according to the stoichiometric ratio in the above general formula of ingredi...

Embodiment 3

[0047] Example 3 ZnO and Sb 2 o 3 The molar ratio is 6:1

[0048] 1) Combine ZnO and Sb 2 o 3 Using absolute ethanol as the medium ball mill for 4h to obtain the slurry, in which ZnO and Sb 2 o 3 The molar ratio is 6:1;

[0049] 2) After drying the slurry obtained in step 1), grind it into a crucible for calcination, wherein the drying temperature is 80°C, the drying time is 8h, the calcination temperature is 700°C, and the calcination time is 10h;

[0050] 3) Grind the calcined powder and sieve through a 60-mesh sieve to obtain the ZnO pressure-sensitive ceramic additive, which is mainly composed of ZnO, Sb 2 o 3 , Sb 2 o 4 , ZnSb 2+5 o 6 , Zn 2.33 Sb 0.67 o 4 Phase composition, in which ZnO is the main crystal phase.

[0051] To (97.5at%-x)ZnO-(1at%)Bi 2 o 3 -(0.5at%)Sb 2 o 3 -(0.5at%)MnO 2 -(0.5at%) Co 2 o 3 X (x=0at%, 0.2at%, 0.4at%, 0.6at%) amount of ZnO varistor ceramic additives are respectively added to the initial powder of the system varistor ce...

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Abstract

The invention belongs to the field of varistor materials, and provides a ZnO varistor ceramic additive as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) carrying out ball milling on ZnO and Sb2O3 by taking a solvent as a medium to obtain slurry, wherein a molar ratio of the ZnO to the Sb2O3 is equal to 1-(14 to 1); (2) drying and calcining the slurry obtained in the step (1) to obtain the ZnO varistor ceramic additive. The invention also provides the ZnO varistor ceramic additive and application thereof. After the ZnO varistor ceramic additive is added into raw materials for preparing ZnO varistor ceramics, ZnO grain growth is promoted, the varistor voltage is reduced, the low temperature sintering of a varistor is maintained, and the nonlinear coefficient of the varistor ceramics can be increased; the sintering temperature of the ZnO varistor ceramics is reduced to 850-900DEG C, the nonlinear coefficient alpha value of the material can reach 91, and the varistor field strength is as low as 500-760V / mm.

Description

technical field [0001] The invention belongs to the field of pressure-sensitive materials, and relates to a ZnO pressure-sensitive ceramic additive and its preparation method and application, in particular to a pressure-sensitive ceramic additive capable of reducing the ZnO varistor voltage and sintering temperature of a varistor and its preparation method and application. Background technique [0002] The varistor is an electronic ceramic device with non-linear volt-ampere characteristics whose resistance value changes sensitively with the increase of the applied voltage. It is widely used in the overvoltage protection of power systems, electrostatic protection and surge current absorption in electronic circuits. etc., widely used. There are many varistor material systems, such as SiC, TiO 2 , SnO 2 And ZnO varistor ceramics, etc. Compared with other varistor materials, ZnO semiconductor ceramics have better pressure-sensitive characteristics: it has a high nonlinear co...

Claims

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Application Information

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IPC IPC(8): C04B35/626C04B35/453
CPCC04B35/453C04B35/62605C04B2235/3241C04B2235/3267C04B2235/3275C04B2235/3294C04B2235/3298C04B2235/96
Inventor 陈冲李伟刘琦董守峰耿梦如成建凤
Owner LIAOCHENG UNIV
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