Strontium titanate piezoresistor and preparation method thereof

A technology of varistors and strontium titanate, which is applied in the field of strontium titanate varistors and its preparation, can solve the problems of low voltage sensitive voltage, high nonlinear coefficient, application prospects that cannot be replaced, etc., and achieve simple product quality, Good process performance

Active Publication Date: 2021-01-05
新昌中国计量大学企业创新研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since strontium titanate (SrTiO 3 ) Ceramics not only have a large dielectric constant, but also have a relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0010]Example 1

[0011]According to the composition of strontium titanate varistor:

[0012]Sr0.98TiO3+0.5mol%(CeO2+Nb2O5)+0.6mol%(ZnO+1 / 2NaCO3)+0.9mol%SiO2.

[0013]The preparation method of strontium titanate varistor includes the following steps:

[0014]a) A strontium titanate (Sr0.98TiO3) Preparation of powder materials

[0015]According to the ratio required in Example 1, weigh strontium chloride (SrCl4), titanium chloride (TiCl4) Add (HCl) hydrochloric acid and aqueous solution, stir and heat at 60°C, add an aqueous solution of equimolar amount of oxalic acid and a small amount of absolute ethanol, adjust the pH to 1 with hydrochloric acid, mix and precipitate, wash and filter to obtain a precipitate, Dry at 110°C, then thermally decompose at 800°C for 4 hours to obtain strontium titanate (Sr0.98TiO3) Powder material.

[0016]b) The obtained strontium titanate (Sr0.98TiO3) Powder and 0.6mol% (ZnO+1 / 2NaCO3)+0.9mol%SiO2Mix and ball mill for 8 hours, dry at 120°C, and punch into discs with Φ8mm ...

Example Embodiment

[0018]Example 2

[0019]According to the composition of strontium titanate varistor:

[0020]Sr0.988TiO3+0.3mol%(CeO2+Nb2O5)+0.4mol%(ZnO+1 / 2NaCO3)+0.5mol%SiO2.

[0021]The preparation method of strontium titanate varistor includes the following steps:

[0022]b) A strontium titanate (Sr0.988TiO3) Preparation of powder materials

[0023]According to the proportion, weigh the strontium chloride (SrCl4), titanium chloride (TiCl4) Add (HCl) hydrochloric acid and aqueous solution, stir and heat at 60°C, add an aqueous solution of equimolar amount of oxalic acid and a small amount of absolute ethanol, adjust the pH to 1 with hydrochloric acid, mix and precipitate, wash and filter to obtain a precipitate, Dry at 110°C, and then thermally decompose at 850°C for 6 hours to obtain strontium titanate (Sr0.98TiO3) Powder material.

[0024]b) The obtained strontium titanate (Sr0.98TiO3) Powder and 0.3mol% (CeO2+Nb2O5)+0.4mol%(ZnO+1 / 2NaCO3)+

[0025]0.5mol% SiO2Mix and ball mill for 10 hours, dry at 120°C, and punch ...

Example Embodiment

[0027]Example 3

[0028]According to the composition of strontium titanate varistor:

[0029]Sr0.984TiO3+0.5mol%(CeO2+Nb2O5)+0.5mol%(ZnO+1 / 2NaCO3)+0.6mol%SiO2.

[0030]The preparation method of strontium titanate varistor includes the following steps:

[0031]c) A strontium titanate (Sr0.988TiO3) Preparation of powder materials

[0032]According to the proportion, weigh the strontium chloride (SrCl4), titanium chloride (TiCl4) Add (HCl) hydrochloric acid and aqueous solution, stir and heat at 60°C, add an aqueous solution of equimolar amount of oxalic acid and a small amount of absolute ethanol, adjust the pH to 1 with hydrochloric acid, mix and precipitate, wash and filter to obtain a precipitate, Dry at 110°C, and then thermally decompose at 850°C for 6 hours to obtain strontium titanate (Sr0.984TiO3) Powder material.

[0033]b) The obtained strontium titanate (Sr0.984TiO3) Powder and 0.5mol% (CeO2+Nb2O5)+

[0034]0.5mol%(ZnO+1 / 2NaCO3)+0.6mol%SiO2Mix and ball mill for 10 hours, dry at 120°C, and punch...

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Abstract

The invention provides a strontium titanate piezoresistor, which comprises the following components: Sr1-x-y-z TiO3+x(CeO2+Nb2O5)+y(ZnO+1/2NaCO3)+zSiO2, and x is equal to 0.1-0.5 mol%, y is equal to 0.2-0.8 mol%, and z is equal to 0.2-0.9 mol%. The preparation method comprises the following steps: adding weighed strontium chloride and titanium chloride into hydrochloric acid and an aqueous solution, stirring and heating to 60 DEG C, adding oxalic acid and a small amount of absolute ethyl alcohol aqueous solution with equal molar weight, regulating the pH value to 1 by using hydrochloric acid,mixing, precipitating, cleaning and filtering to obtain a precipitate, drying the precipitate at 105-130 DEG C, and carrying out thermal decomposition at 750 DEG C and 850 DEG C for 3-8 hours to obtain a strontium titanate powder material; mixing the obtained strontium titanate powder with x(CeO2+Nb2O5)+y(ZnO+1/2NaCO3)+zSiO2, carrying out ball milling for 6-12 hours, drying at the temperature of 110 DEG C and 150 DEG C, and stamping into sheets; and putting the formed sample into a corundum ark, and then putting the corundum ark into a vacuum sintering furnace. In the invention, the powder isdirectly formed by dry pressing, no adhesive is added, and high-temperature glue discharging is not needed; the vacuum sintering atmosphere replaces atmosphere furnace sintering, an oxidation sintering process is carried out in air, the experiment is safer, the process performance is good and simple, and the product quality is easy to control.

Description

technical field [0001] The invention belongs to the technical field of electronic information engineering, and in particular relates to a strontium titanate varistor and a preparation method thereof. Background technique [0002] With the rapid development of my country's industrial production and the widespread use of integrated and large-scale integrated circuits in electronic equipment, electronic components and equipment are increasingly developing in the direction of miniature, lightweight, integrated, multi-functional, high reliability and high stability. Strengthen protection for low-voltage micro-integrated devices. Varistor ceramics can be used for voltage surge suppression and overvoltage protection, and are widely used in various fields such as aviation, aerospace, electric power, national defense, transportation and household appliances. Since strontium titanate (SrTiO 3 ) Ceramics not only have a large dielectric constant, but also have a relatively high nonlin...

Claims

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Application Information

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IPC IPC(8): C04B35/47C04B35/622C04B41/88C04B35/64B28B3/00H01C17/00H01C17/30H01C7/112H01C7/115H01C7/108
CPCC04B35/47C04B35/622C04B41/88C04B41/5116C04B41/009C04B35/64B28B3/00H01C17/00H01C17/30H01C7/112H01C7/115H01C7/108C04B2235/444C04B2235/3229C04B2235/3251C04B2235/3284C04B2235/3418C04B2235/3201C04B2235/60C04B2235/6581
Inventor 王疆瑛张景基刘亚丕杜汇伟朱泽洁
Owner 新昌中国计量大学企业创新研究院有限公司
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