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A kind of ZNO pressure-sensitive ceramic additive and its preparation method and application

A technology of pressure-sensitive ceramics and additives, applied in the field of pressure-sensitive ceramic additives and their preparation, can solve the problems of increasing the sintering temperature and reducing the nonlinear coefficient of the varistor.

Active Publication Date: 2021-04-20
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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  • A kind of ZNO pressure-sensitive ceramic additive and its preparation method and application
  • A kind of ZNO pressure-sensitive ceramic additive and its preparation method and application
  • A kind of ZNO pressure-sensitive ceramic additive and its preparation method and application

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 pressure-sensitive materials, and provides a ZnO pressure-sensitive ceramic additive and its preparation method and application. The preparation method includes the following steps: 1) combining ZnO and Sb 2 o 3 Ball milling with solvent as medium to obtain slurry, in which ZnO and Sb 2 o 3 The molar ratio is 1-14:1; 2) drying and calcining the slurry obtained in step 1) to obtain the ZnO pressure-sensitive ceramic additive. The invention further provides the ZnO pressure-sensitive ceramic additive and its application. The ZnO varistor ceramic additive is added to the raw materials for preparing ZnO varistor ceramics to promote the growth of ZnO crystal grains, reduce the varistor voltage, keep the varistor sintered at low temperature, and increase the nonlinear coefficient of the varistor ceramics, ZnO The sintering temperature of the varistor ceramics is reduced to 850-900°C, the nonlinear coefficient α 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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Patent Type & Authority Patents(China)
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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