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Nanotin dioxide piezoresistor composite powder material and preparation method thereof

A technology of nano-tin dioxide and composite powder, which is applied in the field of varistor manufacturing, can solve the problem that the electrical properties of varistors cannot be greatly improved, the particle size and uniform dispersion of synthetic materials are affected, and additives cannot be continuously improved. Doping uniformity and other issues to achieve the effect of uniform distribution of modified oxides, lower dielectric constant, and reduced leakage current

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.
However, the preparation of element-doped varistor powder by conventional co-precipitation method is to directly mix the compound ionic salt solution and alkali solution and stir it. Due to insufficient mixing, the reaction interface is small, there is a concentration gradient, reaction speed and diffusion The speed is slow, new precipitated particles are formed on the first precipitated particles, and the old and new particles exist at the same time, resulting in extremely uneven particle size distribution
The particle size and homogeneous dispersion of synthetic materials are greatly affected, and the crystal size is difficult to reach the nanometer level, which greatly limits the application of such materials

Method used

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  • Nanotin dioxide piezoresistor composite powder material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In a beaker, mix tin tetrachloride 98mol% powder, bismuth trichloride 1.0mol% powder, antimony trichloride 0.6mol% powder, yttrium trichloride 0.4mol% powder in molar ratio, add 100ml dilute hydrochloric acid, place Heat and stir in a water bath environment at a temperature of 60°C until completely dissolved into a transparent solution;

[0026] The obtained solution and ammonia water with a volume fraction of 35% were passed through a metering pump at the same time, and injected into a colloid mill at the same rate of 5mL / min to rapidly mix and nucleate to form a white precipitate, which was aged overnight and then filtered to obtain a filtrate;

[0027] 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 detected in the filtrate to obtain element-modified bismuth Tin oxide wet gel;

[0028] Dry the obtained tin dioxide wet gel at a temp...

Embodiment 2

[0031] In a beaker, mix tin tetrachloride 92.31mol% powder, bismuth trichloride 5.77mol% powder, antimony trichloride 0.96mol% powder, yttrium trichloride 0.96mol% powder by molar ratio, add 150ml dilute hydrochloric acid, Place in a water bath environment at a temperature of 40°C, heat and stir until completely dissolved into a transparent solution;

[0032] The obtained solution and ammonia water with a volume fraction of 35% were passed through a metering pump at the same time, and injected into a colloid mill at the same rate of 6mL / min to quickly mix and nucleate to form a white precipitate, which was aged overnight and then filtered to obtain a filtrate;

[0033] 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 detected in the filtrate to obtain element-modified bismuth Tin oxide wet gel;

[0034] Dry the obtained tin dioxide wet gel at...

Embodiment 3

[0037] In a beaker, mix tin tetrachloride pentahydrate 99.4mol% powder, bismuth trichloride 0.19mol% powder, antimony trichloride 0.19mol% powder, yttrium trichloride hexahydrate 0.22mol% powder in molar ratio, add 200ml of dilute hydrochloric acid, placed in a water bath environment at a temperature of 50°C, heated and stirred until completely dissolved into a transparent solution;

[0038] The obtained solution and ammonia water with a volume fraction of 35% were passed through the metering pump at the same time, and injected into the colloid mill at the same rate of 8mL / min to quickly mix and nucleate to form a white precipitate, which was aged overnight and then filtered to obtain the filtrate;

[0039] 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 detected in the filtrate to obtain element-modified bismuth Tin oxide wet gel;

[0040] ...

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Abstract

The invention relates to a nanotin dioxide piezoresistor composite powder material. The material is prepared from tin dioxide, bismuth trioxide, antimony trioxide and yttrium trioxide. The preparation method is characterized by preparing the high-performance nanotin dioxide composite powder by adopting a forced micromixing method and a colloid mill as a reaction container through a nucleating / growth isolation method. The preparation of the nanotin dioxide piezoresistor composite powder with excellent performance is a crucial to obtaining of a high-performance piezoresistor. The forced micromixing technology is adopted during nucleating / growth isolation preparation, a salt solution and an alkaline solution are fast and fully mixed at a gap between a rotor and a stator of the reactor, so that the material has the characteristics of being small in particle size and uniform in distribution; zinc element and other modification elements can be coprecipitated during the growth of crystal grains, so that the microscopic uniformity of the composite powder can be improved. Therefore, the nanotin dioxide piezoresistor composite powder which is small in grain size, uniform in the distribution of modification oxides, and narrow in the distribution of grain sizes can be obtained.

Description

technical field [0001] The invention relates to a nano tin dioxide varistor composite powder material 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 of traditional zinc oxi...

Claims

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Application Information

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IPC IPC(8): C04B35/453C04B35/626C04B35/63
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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