Nano-ZnO varistor composite powder material and preparation method thereof

A nano-zinc oxide and composite powder technology is applied in the field of varistor manufacturing, which can solve the problems that the electrical properties of varistors cannot be greatly improved, and the uniformity of additive doping cannot be continuously improved, and the chemical composition can be achieved. Accurate control, uniform distribution of modified oxides, and the effect of increasing the density of grains and grain boundaries

Inactive Publication Date: 2014-12-10
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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  • Nano-ZnO varistor composite powder material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In a beaker, mix zinc chloride 99mol%, dicobalt trichloride 0.4mol% powder, bismuth trichloride 0.2mol% powder, antimony trichloride 0.2mol% powder, yttrium chloride hexahydrate 0.2mol% powder , add 300mL of dilute hydrochloric acid, place in a constant temperature water bath environment at a temperature of 40°C, and stir until completely dissolved into a transparent solution;

[0023] 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 8, continue stirring until the precipitation is complete, and age Filter after overnight to obtain the filtrate;

[0024] Wash the obtained filtrate, first wash with absolute ethanol with a volume fraction of 20% until the filtrate is neutral, and then wash with absolute ethanol until no chloride ions are detec...

Embodiment 2

[0028] In a beaker, put zinc chloride 89.6mol%, dicobalt trichloride 2.8mol% powder, bismuth trichloride 5.7mol% powder, antimony trichloride 0.95mol% powder, yttrium chloride hexahydrate 0.95mol% powder Mix, add 300mL dilute hydrochloric acid, place in a constant temperature water bath environment at a temperature of 50°C, and stir until completely dissolved into a transparent solution;

[0029] 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 system pH to 8, continue stirring until the precipitation is complete, and age overnight Post-filtering to obtain the filtrate;

[0030] Wash the filtrate, first wash with 20% absolute ethanol by volume fraction until the filtrate is neutral, and then wash with absolute ethanol until no chloride ions are detected in the filtra...

Embodiment 3

[0034] In a beaker, mix zinc chloride 98mol%, dicobalt trichloride 1mol% powder, bismuth trichloride 0.5mol% powder, antimony trichloride 0.25mol% powder, yttrium chloride hexahydrate 0.25mol% powder, Add 300mL of dilute hydrochloric acid, place in a constant temperature water bath environment at a temperature of 60°C, and stir until completely dissolved into a transparent solution;

[0035] 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 system pH to 8, continue stirring until the precipitation is complete, and age overnight Post-filtering to obtain the filtrate;

[0036] Wash the filtrate, first wash with 20% absolute ethanol by volume fraction until the filtrate is neutral, and then wash with absolute ethanol until no chloride ions are detected in the filtrate to...

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Abstract

The invention relates to a nano-ZnO varistor composite powder material and a preparation method thereof. The material is composed of ZnO, Co2O3, Bi2O3, Sb2O3 and Y2O3. The preparation method adopts a chemical coprecipitation method and particularly comprises the following steps: adding ZnO, Bi2O3, Co2O3, Sb2O3 and Y2O3 in dilute hydrochloric acid serving as a solvent, dissolving to form a transparent solution in a constant-temperature water bath environment; dropwise adding an ammonia solution serving as a precipitant into the transparent solution at a constant speed; and precipitating, filtrating, washing, drying, grinding and calcinating, thus obtaining the nano-ZnO varistor composite powder material. The preparation of nano-ZnO composite powder with excellent performances is a key of manufacture of a high-performance varistor. The ZnO 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; and the preparation method disclosed by the invention is simple, and precisely controllable in component, and products have the characteristics of good morphology consistency, excellent electrical properties and the like.

Description

technical field [0001] The invention relates to a nano zinc oxide varistor composite powder material with excellent performance and a preparation method thereof, belonging to the technical field of varistor manufacture. 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453C04B35/626C04B35/63
Inventor 徐金宝张家齐田二讲陈敬春
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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