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Strontium titanate pressure sensitive resistor and its production process

A technology of varistors and strontium titanate, which is applied in the direction of varistor cores, varistors, overvoltage protection resistors, etc., can solve problems that are not suitable for industrial production, large voltage difference between three electrodes, and industrial production. Difficulties and other problems, to achieve the effect of small change rate, good voltage consistency, and environmental protection

Inactive Publication Date: 2008-01-09
上海易力禾电子器件有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the development of the market, users have higher requirements for the electrical performance index of the product, and the original product has a large voltage difference between the three electrodes, the voltage change rate after welding and pulse test is high, and the pass rate of the user on the machine low, seriously restricting the development of the product
[0012] For the sintering process of strontium titanate varistor ceramics, although it has been reported that semiconducting can be achieved by sintering in air through the action of semiconducting additives, it is actually difficult to obtain good semiconducting ceramics and achieve industrial production of; and to make SrTiO 3 Insulation of grain boundaries of semiconductors to obtain pressure-sensitive properties, most of the previous reports used liquid-phase coating and diffusion of oxides on the surface of ceramics or heat treatment in an oxidizing atmosphere, but these two methods are not suitable for industrial production

Method used

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  • Strontium titanate pressure sensitive resistor and its production process
  • Strontium titanate pressure sensitive resistor and its production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Table 1 The relationship between the formulation of the synthetic material and the calcination temperature and the content of free SrO

[0063] serial number

[0064] ST-5

[0065] SrTiO 3 Varistor main material SrTiO 3 by SrCO 3 and TiO 2 Synthesized by reaction at high temperature. SrCO 3 and TiO 2 The ratio is the key to the synthesis technology, and also directly affects the SrTiO 3 For the semiconducting of functional ceramics, the Sr / Ti ratio of the present invention can be adjusted within the range of 0.96-1.06. The formula ratio of synthetic materials is shown in Table 1.

[0066] Use industrially pure or chemically pure SrCO 3 and TiO 2 The raw materials are weighed according to the formula ratio in Table 1, mixed and milled in a ball mill for 10-40 hours, or mixed and milled in a stirring ball mill for 1-10 hours, discharged, dried at 100-150°C for 8-15 hours, and sieved according to a certain Put a limited amount into a high-temp...

Embodiment 2

[0072] According to the data result of table 1 and table 2, select ST-1 as the main material formula, fix Y, the content of Mn and Si is constant, change the content of Nb from 0.00~5.00mol%, same process as described in embodiment 1 Conditions Prepare samples and measure their electrical properties, and calculate the value of α. The properties of the samples are shown in Table 3:

[0073] The influence of table 3 additive formula on performance (different content of Nb)

[0074] Part No

[0075] When the sintering temperature is constant, the voltage decreases and α increases as the Nb content increases.

Embodiment 3

[0077] The contents of Nb, Mn and Si were fixed, and the content of Y was changed from 0.00 to 5.00 mol%. Samples were prepared under the same process conditions as described in Example 1 and their electrical properties were measured to calculate the value of α. The properties of the samples are shown in Table 4:

[0078] Table 4 The impact of additive formula on performance (different contents of Y)

[0079] Part No

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Abstract

The invention is concerned with the preparation method for strontium titanate pressure sensitive resistor, the resistor contains the followings with Moore share: strontium titanate is 100 shares, semiconducting addition is 0.01 to 5.00 shares, the changing addition is 0.01 to 5.00 shares, sintering auxiliary agent is 0.001 to 3.00 shares. The method is: prepares strontium titanate, and prepares resistor. Comparing with the existing technology, the invention is with better voltage consistency, small changing rate after text, high up-to-standard rate.

Description

technical field [0001] The invention relates to the field of new inorganic non-metal composite functional ceramic materials, in particular to a kind of SrTiO with pressure-sensitive-capacitance dual functions 3 Base varistor and its preparation method. Background technique [0002] A varistor is a non-linear resistor that is sensitive to an applied voltage. Specifically, it is a component whose resistance suddenly decreases when the applied voltage exceeds a certain value. [0003] The V-I characteristic of the varistor can be expressed by the approximate formula (1): [0004] I=(V / C) α (1) [0005] In the formula: V: Applied voltage, C: Material constant, α: Non-linear exponent. [0006] The larger α, the better the nonlinearity. The nonlinear index is generally expressed as formula (2) by E10 and E1: [0007] α=1 / log(E10 / E1) (2) [0008] In the formula: E10: the voltage across the resistor when the current flowing through the resistor is 10mA [0009] E1: The ...

Claims

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Application Information

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IPC IPC(8): H01C7/115H01C7/12H01C17/00
Inventor 李红耘尧巍华熊西周张中太
Owner 上海易力禾电子器件有限公司
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