Zinc oxide resistance sheet and preparation method thereof
A technology of zinc oxide resistors and zinc oxide, applied in the direction of varistors, varistor cores, etc., can solve the problem of difficulty in ensuring high gradient and high flow characteristics of zinc oxide resistors, insufficient growth of zinc oxide grains, Problems affecting the performance of zinc oxide resistors, etc., to achieve the effect of optimizing the sintering temperature curve, inhibiting the excessive growth of grains, and weakening the volatilization of dopants
Active Publication Date: 2016-09-28
STATE GRID CORP OF CHINA +2
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Problems solved by technology
When the sintering temperature is too low or the sintering time is too short, it will lead to insufficient growth of zinc oxide grains; A large number of impurities volatilize, which also affects the performance of zinc oxide resistors
The current sintering method is difficult to control, and it is difficult to ensure that the produced zinc oxide resistors have high gradient and high flow characteristics
Method used
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Embodiment 1
[0034] A zinc oxide resistance sheet of the present invention is formed by sintering the following mole fractions of raw materials: zinc oxide: 90%, cobalt oxide: 1.1%, chromium oxide: 1.3%, silicon oxide: 1.2%, bismuth oxide: 1.4%, Nickel oxide: 0.8 mol, manganese oxide: 0.8%, antimony oxide: 1.4%, yttrium oxide 0.8% and zirconium oxide 1.2%.
[0035] A preparation method of the above-mentioned zinc oxide resistance sheet of the present embodiment, comprising the following steps:
[0036] (1) Ingredients: Weigh the following raw materials according to mole percentage: zinc oxide: 90%, cobalt oxide: 1.1%, chromium oxide: 1.3%, silicon oxide: 1.2%, bismuth oxide: 1.4%, nickel oxide: 0.8mol, oxide Manganese: 0.8%, Antimony Oxide: 1.4%, Yttrium Oxide 0.8%, and Zirconia 1.2%. A large scale balance and a precision balance are used for weighing to accurately control the proportion of each mixed material.
[0037] (2) Wet milling and granulation: Add the additives described in step...
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Abstract
The invention discloses a zinc oxide resistor and a preparation method thereof. The zinc oxide resistor is sintered from the following mole fraction raw materials: zinc oxide base material 95.5%-99%, yttrium oxide 0.5%-1.9%, oxide Zirconium 0.5% to 2.6%. The preparation method comprises the following steps: (1) batching; (2) wet grinding and granulation; (3) hydraulic pressure forming; (4) segmental sintering. The zinc oxide resistance sheet of the present invention has the advantages of high potential gradient and large flow capacity. Compared with the zinc oxide resistance sheet prepared by the conventional method, the potential gradient of the zinc oxide resistance sheet prepared by the preparation method of the present invention is increased by nearly 1 / 4, and the flow rate is improved. Ability increased by 1 / 3.
Description
technical field [0001] The invention belongs to the technical field of high-voltage electrical sensitive ceramic materials, and in particular relates to a zinc oxide resistance sheet with high potential gradient and large flow capacity and a preparation method thereof. Background technique [0002] The rapid development of UHV has put forward higher and higher requirements for the miniaturization and large capacity of power equipment. Zinc oxide varistors are the core components of zinc oxide arresters, but the current potential gradient and flow capacity of zinc oxide resistors are relatively low. Using zinc oxide varistors with high potential gradient and large flow capacity to assemble metal oxide arresters in UHV transmission systems can reduce their weight, height, and volume, and further improve the safety and reliability of arresters and even the entire power system. sex. [0003] The potential gradient and flow capacity of zinc oxide resistors are determined by the...
Claims
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IPC IPC(8): C04B35/453C04B35/622H01C7/112
Inventor 方针吴伟陆佳政赵纯李波张红先
Owner STATE GRID CORP OF CHINA