High potential gradient zinc oxide pressure-sensitive resistor material and preparation process thereof

A varistor, zinc oxide technology, applied in the direction of varistor, varistor core, etc., can solve the problems of increasing production cost, reducing grain growth time, polluting the environment, etc.

Inactive Publication Date: 2012-06-27
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, although the rare earth oxide obtained by decomposing yttrium nitrate and praseodymium nitrate reduces the production cost, a large amount of atmospheric pollutants such as nitrogen oxides will be released when the nitrate is decomposed, which will cause serious pollution to the environment. At the same time, the invention The sintering temperature is as high as 1200°C, which will increase energy consumption, which is not conducive to the promotion and application of industrialization
[0007] Due to the following problems in the preparation process of the existing high-potential gradient zinc oxide varistor materials: on the one hand, the sintering temperature is high, the energy consumption is large, and the production cost is greatly increased, which is not conducive to industrialization. How

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] An appropriate amount of yttrium oxalate and cerium oxalate were calcined at 650°C and 400°C for 3 hours and 4 hours respectively, and the heating rate was 1°C / min to obtain the rare earth oxide Y 2 o 3 and CeO 2 . Calculated by mole percentage, weigh the commercially available micron-sized ZnO 93.5%, Bi 2 o 3 1.0%, MnO 2 1.0%, Co. 2 o 3 1.0%, Sb 2 o 3 2.0%, SiO 2 0.09%, Cr 2 o 3 1.0%, NiO 0.01%, at the same time weigh the product Y which is fully decomposed by yttrium oxalate and cerium oxalate 2 o 3 0.3%, CeO 2 0.1%, put the above materials into a frequency conversion planetary high-energy ball mill, add an appropriate amount of ethanol for high-energy wet grinding, wherein the mass of the total amount of zirconia grinding balls and powder is 18:1, and the total amount of balls, powder and ethanol does not exceed 2 / 3 of the volume of the ball mill tank, the rotating speed is 400 rpm, and the ball milling time is 16 hours. During the ball milling ...

Embodiment 2

[0076] Calcinate an appropriate amount of lanthanum oxalate, praseodymium oxalate, neodymium oxalate, and samarium oxalate at 1000°C for 1 hour, and the heating rate is 2°C / min to obtain the corresponding rare earth oxide La 2 o 3 、Pr 6 o 11 、Nd 2 o3 and Sm 2 o 3 . Calculated by mole percentage, weigh the commercially available micron-sized ZnO 98.5%, Bi 2 o 3 0.42%, MnO 2 0.02%, Co 2 o 3 0.03%, Sb 2 o 3 0.49%, SiO 2 0.01%, Cr 2 o 3 0.02%, NiO 0.01%, and at the same time weigh the La 2 o 3 0.1%, Pr 6 o 11 0.3%, Nd 2 o 3 0.05%, Sm 2 o 3 0.05% Put the above materials into a frequency conversion planetary high-energy ball mill, add an appropriate amount of ethanol for high-energy wet grinding, wherein the mass of the total amount of zirconia balls and powder is 18:1, and the total amount of balls, powder and ethanol does not exceed the ball mill 2 / 3 of the tank volume, the rotating speed is 550 rpm, the ball milling time is 3 hours, 0.3wt% ammonium...

Embodiment 3

[0080] Calcinate appropriate amount of lanthanum carbonate, europium carbonate, and scandium carbonate at 900°C, 1000°C, and 950°C for 2 hours respectively, and the heating rate is 2°C / min to obtain the corresponding rare earth oxide La 2 o 3 、Eu 2 o 3 and Sc 2 o 3 . Calculated by mole percentage, weigh the commercially available micron-sized ZnO 95.0%, Bi 2 o 3 0.9%, MnO 2 0.8%, Co 2 o 3 0.7%, Sb 2 o 3 1.0%, SiO 2 0.03%, Cr 2 o 3 0.5%, NiO 0.02%, and at the same time weigh the product La which is fully decomposed by the rare earth element carbonate 2 o 3 0.05%, Eu 2 o 3 0.4%, Sc 2 o 3 0.6% Put the above materials into a variable frequency planetary high-energy ball mill, add an appropriate amount of ethanol for high-energy wet grinding, wherein the mass of the total amount of zirconia balls and powder is 18:1, and the total amount of balls, powder and ethanol does not exceed the ball mill 2 / 3 of the tank volume, the rotating speed is 500 rpm, the ...

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Abstract

The invention relates to a high potential gradient zinc oxide pressure-sensitive resistor material and a preparation process thereof. The high potential gradient zinc oxide pressure-sensitive resistor material with uniform particle sizes is obtained by weighing a main material ZnO, a doping oxide, and a product rare earth oxide obtained by carrying out thermal decomposition on a rare earth oxalate or/and carbonate or/and hydroxide according to proportions, carrying out high energy wet grinding, drying, presintering at 200-800DEG C, carrying out high energy dry grinding, and sintering at 800-1100DEG C. The preparation process of the invention has the advantages of simplicity, low cost, environmental protection and low energy consumption, and the prepared zinc oxide pressure-sensitive resistor material can be used for preparing high quality lightning arrester products for ultrahigh electric power systems.

Description

technical field [0001] The invention relates to the technical field of varistor material preparation, in particular, the invention relates to a high potential gradient zinc oxide varistor material and a preparation method thereof. Background technique [0002] A varistor is a resistor whose resistance value changes with voltage within a certain current and voltage range, or "resistance value is sensitive to voltage". The English name is "Voltage Dependent Resistor" abbreviated as "VDR", or "Varistor". The resistor material of the varistor is a semiconductor, so it is a variety of semiconductor resistors. "Zinc oxide" (ZnO) varistors, which are widely used now, are composed of divalent element (Zn) and hexavalent element oxygen (O) as the main material. So from the material point of view, the zinc oxide varistor is a "II-VI oxide semiconductor". [0003] ZnO has a hexagonal wurtzite structure and is a metal-excess non-stoichiometric n-type semiconductor. ZnO varistors have...

Claims

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Application Information

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IPC IPC(8): C04B35/453C04B35/622H01C7/112
Inventor 谭强强徐宇兴
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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