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Stannic oxide pressure sensitive resistor composite powder material and preparation method thereof

A technology of tin dioxide and composite powder, which is applied in the field of tin dioxide varistor composite powder materials and its preparation, can solve the problem that the uniformity of additive doping cannot be continuously improved, and the electrical performance of varistors cannot be greatly improved. Improvement and other issues, to achieve the effect of uniform distribution of modified oxides, accurate control of chemical composition, and refinement of grain size

Inactive Publication Date: 2014-12-17
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This particle size range is not much different from the particle size of the main base material zinc oxide, so this method cannot continue to improve the doping uniformity of additives, and the electrical properties of varistors cannot be greatly improved.

Method used

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  • Stannic oxide pressure sensitive resistor composite powder material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In a beaker, mix tin tetrachloride 99mol% powder, cobalt chloride 0.4mol% powder, bismuth chloride 0.2mol% powder, praseodymium nitrate 0.2mol% powder, yttrium nitrate 0.2mol% powder, add 300mL absolute ethanol and Add a polyethylene glycol dispersant with a mass fraction of 2% in the amount of tin tetrachloride, heat and stir in a water bath environment at a temperature of 60°C until it completely dissolves into a transparent solution to form a solution;

[0031] Place the obtained transparent solution in a constant temperature water bath environment with a temperature of 40°C, use ammonia water with a volume fraction of 25% as a precipitant, and add it dropwise to the transparent solution at a constant speed, adjust the pH of the system to 13, and continue stirring until the precipitation is complete. After aging overnight Filtrate to get filtrate;

[0032]Wash the obtained filtrate, first wash with absolute ethanol with a volume fraction of 20% until the filtrate is ...

Embodiment 2

[0036] In a beaker, mix tin tetrachloride 97mol% powder, cobalt trichloride 1mol% powder, bismuth chloride 1mol% powder, praseodymium nitrate 0.5mol% powder, yttrium nitrate 0.5mol% powder, add 300mL absolute ethanol and The amount of tin tetrachloride is added to a polyethylene glycol dispersant with a mass fraction of 2%, placed in a water bath environment with a temperature of 50°C, heated and stirred until completely dissolved into a transparent solution;

[0037] Place the obtained transparent solution in a constant temperature water bath environment at a temperature of 40°C, use ammonia water with a volume fraction of 25% as a precipitant, and add it dropwise to the transparent solution at a constant speed, adjust the pH of the system to 8, and continue stirring until the precipitation is complete. After aging overnight Filtrate to get filtrate;

[0038] Wash the obtained filtrate, first wash with absolute ethanol with a volume fraction of 20% until the filtrate is neutr...

Embodiment 3

[0042] In a beaker, mix tin tetrachloride 93mol% powder, cobalt trichloride 2mol% powder, bismuth chloride 4mol% powder, praseodymium nitrate 0.5mol% powder, yttrium nitrate 0.5mol% powder, add 300mL absolute ethanol and The amount of tin tetrachloride is added to a polyethylene glycol dispersant with a mass fraction of 2%, placed in a water bath environment with a temperature of 55°C, heated and stirred until completely dissolved into a transparent solution;

[0043] Place the obtained transparent solution in a constant temperature water bath environment with a temperature of 40°C, use ammonia water with a volume fraction of 25% as a precipitant, and add it dropwise to the transparent solution at a constant speed, adjust the pH of the system to 13, and continue stirring until the precipitation is complete. After aging overnight Filtrate to get filtrate;

[0044] Wash the obtained filtrate, first wash with absolute ethanol with a volume fraction of 20% until the filtrate is ne...

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Abstract

The invention relates to a stannic oxide pressure sensitive resistor composite powder material with excellent properties, and a preparation method thereof. The powder material is prepared from SnO2, Co2O3, Bi2O3, Pr2O3 and Y2O3. The preparation method comprises the following steps: by adopting a chemical coprecipitation method and by taking absolute ethyl alcohol as an organic solvent and polyethylene glycol as a dispersing agent, adding stannic chloride, tribismuth chloride, tricobalt chloride, praseodymium nitrate and yttrium nitrate, dissolving the components into a transparent solution in a constant temperatue water bath environment, dropwise adding an ammonia water solution used as a precipitator into the transparent solution at a uniform speed, precipitating, filtering, washing, drying, grinding and calcining, thereby obtaining the stannic oxide pressure sensitive resistor composite powder material. The stannic oxide composite powder with excellent properties is essential to manufacturing of high-performance pressure sensitive resistors. The stannic oxide composite powder prepared by using the method disclosed by the invention has the advantages of small particle size, uniform modified oxide distribution and narrow particle size distribution. The stannic oxide pressure sensitive resistor composite powder material disclosed by the invention is simple in preparation method, precise and controllable in component, relatively good in product morphology consistence and excellent in electric property.

Description

technical field [0001] The invention relates to a tin dioxide varistor composite powder material with excellent performance and a preparation method thereof, belonging to the technical field of varistor manufacturing. Background technique [0002] Varistor materials are materials used to make piezoresistors. Utilizing the nonlinear volt-ampere characteristics of the varistor material, when an overvoltage appears between the two poles of the varistor, the varistor can clamp the voltage to a relatively fixed voltage value, thereby realizing the protection of the subsequent circuit . Varistors can effectively protect electronic devices, electronic circuits, electronic equipment, and electrical equipment from abnormal voltage shocks by absorbing pulse voltage, surge voltage, induced lightning voltage, and operating overvoltage. [0003] Zinc oxide is a traditional varistor material, which is widely used in the field of electricity. Now, the electrical performance indicators o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/457C04B35/626
Inventor 徐金宝张家齐边亮王磊
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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