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High-nonlinearity and low-leakage-current varistor and preparation method thereof

A high nonlinearity and low leakage technology, applied in the direction of varistors, varistor cores, etc., can solve problems such as the reduction of nonlinear coefficient and the increase of leakage current of resistors, and achieve high nonlinearity and low leakage current , the effect of good electrical properties

Inactive Publication Date: 2019-04-05
上海大学浙江嘉兴新兴产业研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present invention provides a high nonlinear, low leakage current varistor and its preparation method, which can effectively solve the problems of increased leakage current and reduced nonlinear coefficient caused by adding Al ions

Method used

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  • High-nonlinearity and low-leakage-current varistor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment provides a highly non-linear, low leakage current varistor sheet, the formula components include zinc oxide ZnO191.25mol, bismuth oxide Bi 2 o 3 1mol, cobalt trioxide Co 2 o 3 2mol, manganese dioxide MnO 2 1.13mol, antimony trioxide Sb 2 o 3 1.75mol, chromium trioxide Cr 2 o 3 0.625, nickel oxide NiO1mol, silicon dioxide SiO 2 3mol, aluminum oxide Al2 o 3 0.18mol.

[0029] The preparation method of the above-mentioned highly non-linear, low leakage current varistor sheet comprises the following steps:

[0030] (a) the oxide additive Bi 2 o 3 (1mol), Co 2 o 3 (2mol), MnO 2 (1.13mol), Sb 2 o 3 (1.75mol), Cr 2 o 3 (0.625mol), NiO(1mol), SiO 2 (3mol), Al 2 o 3 (0.18mol) was added into a ball mill jar, and deionized water was added to carry out a ball mill, and the ball mill time was 2400min.

[0031] (b) Add ZnO (191.25mol), dispersant, polyvinyl alcohol PVA, and deionized water to the slurry of the first ball mill, and perform a second...

Embodiment 2

[0036] This embodiment provides a highly non-linear, low leakage current varistor sheet, the formula components include zinc oxide ZnO191.25mol, bismuth oxide Bi 2 o 3 1mol, cobalt trioxide Co 2 o 3 2mol, manganese dioxide MnO 2 1.13mol, antimony trioxide Sb 2 o 3 1.75mol, chromium trioxide Cr 2 o 3 0.625mol, nickel oxide NiO1mol, silicon dioxide SiO 2 2.875mol, aluminum oxide Al 2 o 3 0.1mol.

[0037] The preparation method of the above-mentioned highly non-linear, low leakage current varistor sheet comprises the following steps:

[0038] (a) the oxide additive Bi 2 o 3 (1mol), Co 2 o 3 (2mol), MnO 2 (1.13mol), Sb 2 o 3 (1.75mol), Cr 2 o 3 (0.625mol), NiO(1mol), SiO 2 (2.875mol), Al 2 o 3 (0.1mol) was added into a ball mill jar, and deionized water was added to carry out a ball mill, and the ball mill time was 2400min.

[0039] (b) Add ZnO (191.25mol), dispersant, polyvinyl alcohol PVA, and deionized water to the slurry of the first ball mill, and perfo...

Embodiment 3

[0047] This embodiment provides a highly non-linear, low leakage current varistor sheet, the formula components include zinc oxide ZnO153.0mol, bismuth oxide Bi 2 o 3 1.1mol, cobalt trioxide Co 2 o 3 1.6mol, manganese dioxide MnO 2 0.9mol, antimony trioxide Sb 2 o 3 1.5mol, chromium trioxide Cr 2 o 3 0.5mol, nickel oxide NiO0.8mol, silicon dioxide SiO 2 2.4mol, aluminum oxide Al 2 o 3 0.1mol.

[0048] The preparation method of the above-mentioned highly non-linear, low leakage current varistor sheet comprises the following steps:

[0049] (a) the oxide additive Bi 2 o 3 (1.1mol), Co 2 o 3 (1.6mol), MnO 2 (0.9mol), Sb 2 o 3 (1.5mol), Cr 2 o 3 (0.5mol), NiO (0.8mol), SiO 2 (2.4mol), Al 2 o 3 (0.1mol) was added into a ball mill jar, and deionized water was added to carry out a ball mill, and the ball mill time was 2800min.

[0050] (b) add ZnO (153.0mol) in the slurry of primary ball milling, the polyvinyl alcohol PVA solution of dispersant fatty alcohol po...

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Abstract

The invention provides a high-nonlinearity and low-leakage-current varistor and a preparation method thereof. The high-nonlinearity and low-leakage-current varistor comprises the following components:ZnO, Bi2O3, Co2O3, MnO2, Sb2O3, Cr2O3, NiO, SiO2 and Al2O3, and the molar ratio of the components is as follows: ZnO: Bi2O3: Co2O3: MnO2: Sb2O3: Cr2O3: NiO: SiO2: Al2O3= 1520-1540: 7-12: 15-17: 8-10:13-16: 4-6: 7-9: 23-25: 0.8-1.5. Further, the invention further provides a preparation method of the high-nonlinearity and low-leakage-current varistor. The sintering mechanism and the potential barrier height are affected through specific ratio of oxide raw materials, the firing temperature is reduced, the nonlinearity of the ZnO varistor is improved, the leakage current of the ZnO varistor is reduced, the performance is high, a preparation course is simple in process, the production cost is low, and large-scale production is facilitated.

Description

technical field [0001] The invention belongs to the technical field of electrical material preparation, and in particular relates to a highly nonlinear and low leakage current varistor sheet and a preparation method thereof. Background technique [0002] Zinc oxide (ZnO) varistor ceramics is a polycrystalline electronic ceramic sintered body, which is made by adding a small amount of bismuth oxide (Bi) to zinc oxide (ZnO) powder. 2 o 3 ), cobalt oxide (Co 2 o 3 ), manganese dioxide (MnO 2 ), antimony oxide (Sb 2 o 3 ), chromium oxide (Cr 2 o 3 ) and other additives are mixed and molded and then sintered at high temperature. It can be used as a surge absorber, voltage protector, varistor and lightning arrester, etc., and has become an important material in the field of electronic ceramics. With the continuous improvement of integrated circuits and transmission voltage levels, the insulation problem of equipment is becoming more and more serious. The use of high-gradi...

Claims

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Application Information

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IPC IPC(8): C04B35/453C04B35/622H01C7/112
CPCC04B35/453C04B35/622C04B2235/3217C04B2235/3241C04B2235/3267C04B2235/3275C04B2235/3279C04B2235/3294C04B2235/3298C04B2235/3418H01C7/112
Inventor 姚政施利毅任鑫袁帅余文琪
Owner 上海大学浙江嘉兴新兴产业研究院
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