Method for preparing direct-current zinc oxide resistance card

A technology of zinc oxide resistors and zinc oxide, which is applied in the field of overvoltage protection resistors or lightning arresters, can solve the problems of grain boundary coarsening, increased leakage current, and affecting the aging resistance of zinc oxide resistors, so as to achieve the purpose of suppressing volatilization, Low cost and suitable for large-scale production

Active Publication Date: 2011-11-23
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved in the present invention is to provide a method for preparing a direct current zinc oxide resistor, which is low in cost and simple in process, and solves the problem of secondary sintering of bismuth oxide caused by the direct current diffusion process, resulting in coarsening of grain boundaries. , the leakage current increases, which affects the aging resistance of zinc oxide resistors

Method used

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  • Method for preparing direct-current zinc oxide resistance card
  • Method for preparing direct-current zinc oxide resistance card
  • Method for preparing direct-current zinc oxide resistance card

Examples

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Embodiment 1

[0027] In this embodiment, the main material is zinc oxide, and the content of each added element is calculated according to the mass percentage of its oxide, respectively Bi 2 o 3 : 5.1%; Sb 2 o 3 : 3.8%; CoO: 1.15%; MnO: 0.7%; Ni 2 o 3 : 0.75%; Al 2 o 3 : 0.03%; B 2 o 3 : 0.008%; Ag 2 O: 0.015%; the balance is ZnO.

[0028] Among them, aluminum nitrate is used for aluminum oxide, silver oxide and boron oxide are added in the form of glass powder, and oxides are used for the rest of the components.

[0029] The specific preparation method is as follows:

[0030] (1) Calcination of additives: Weigh other additives except zinc oxide and aluminum nitrate in proportion, add a certain amount of deionized water, use high-energy sand mill to finely grind, mix for 5 hours and then dry, the dried powder The material is calcined at 800°C for 1 hour, and then finely ground by a high-energy ball mill, and the particle size is controlled below 2 μm;

[0031] (2) Ceramic powder...

Embodiment 2

[0055] In this embodiment, the main material is zinc oxide, and the content of each added element is calculated according to the mass percentage of its oxide, respectively Bi 2 o 3 : 4.4%; Sb 2 o 3 : 3.6%; CoO: 0.96%; MnO: 0.55%; Ni 2 o 3 : 0.35%; SnO 2 : 0.8%; Al 2 o 3 : 0.005%; B 2 o 3 : 0.01%; Ag 2 O: 0.006%,; the balance is zinc oxide.

[0056] Among them, aluminum nitrate is used for aluminum oxide, silver oxide and boron oxide are added in the form of glass powder, and oxides are used for the rest of the components.

[0057] The specific preparation method is as follows:

[0058] (1) Calcination of additives: Weigh other additives except zinc oxide and aluminum nitrate in proportion, add a certain amount of deionized water, use high-energy sand mill to finely grind, mix for 3 hours and then dry, the dried powder The material is calcined at 950°C for 2 hours, and then finely ground by a high-energy ball mill, and the particle size is controlled below 2 μm;

...

Embodiment 3

[0076] In this embodiment, the main material is zinc oxide, and the content of each added element is calculated according to the mass percentage of its oxide, respectively Bi 2 o 3 : 3.5%; Sb 2 o 3 : 2.8%; CoO: 1.0%; MnO: 0.5%; Ni 2 o 3 : 0.45%; Y 2 o 3 : 0.65%; Al 2 o 3 : 0.01%; B 2 o 3 : 0.015%; Ag 2 O: 0.004%; the balance is 4.4% of zinc oxide.

[0077] Among them, aluminum nitrate is used for aluminum oxide, silver oxide and boron oxide are added in the form of glass powder, and oxides are used for the rest of the components.

[0078] The specific preparation method is as follows:

[0079] (1) Calcination of additives: Weigh other additives except zinc oxide and aluminum nitrate in proportion, add a certain amount of deionized water, use high-energy sand mill to finely grind, mix for 4 hours and then dry, the dried powder The material is calcined at 850°C for 3 hours, and then finely ground with a high-energy ball mill, and the particle size is controlled belo...

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Abstract

The invention discloses a method for preparing a direct-current zinc oxide resistance card. The method comprises the following steps of: arranging resistance card green pressing which is subjected to binder removal on a high-temperature ceramic plate with double-layer padding, and covering a high-temperature ceramic crucible on the ceramic plate, so that the green pressing is sealed in space enclosed by the ceramic plate and the ceramic crucible to be sintered in one piece. In the method, the resistance card is in the atmosphere with high bismuth content at high temperature by the design of apadding composition, so that the volatilization of bismuth oxide is inhibited effectively. Compared with the prior art, due to the adoption of a one-time sintering process, a direct-current coating process and a direct-current diffusion process are saved, the problems of the coarsening of crystal boundaries, the increase of leakage current and the influence on the aging resistance of the zinc oxide resistance card due to two-time sintering of the bismuth oxide in the direct-current diffusion process are solved, and the method is low in cost and high in efficiency, and is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of overvoltage protection resistors or lightning arresters, in particular to a preparation method capable of improving the aging resistance of zinc oxide resistance sheets. Background technique [0002] With the development of the economy, the requirements for transport capacitance and voltage are constantly increasing, and the requirements for the safety and reliability of power transmission and transformation equipment are also getting higher and higher. Zinc oxide (ZnO) resistors are characterized by their superior nonlinear characteristics. It is widely used in electronics and power systems to protect power transmission and transformation equipment from overvoltage damage such as lightning. [0003] The successful research of high-power converters (rectification and inverter) has enabled high-voltage direct current transmission to break through technical barriers, and direct current transmission has gain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453C04B35/622
Inventor 段雷许高杰崔平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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