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A kind of preparation method of high temperature thick film thermistor

A thick-film thermistor and resistance technology, which is applied in the field of electronic materials, can solve the problems of limited device use and poor aging performance, and achieve the effect of miniaturization

Active Publication Date: 2015-09-16
XINJIANG ZHONGKE SENSING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional temperature sensors are generally based on AB 2 o 4 The negative temperature coefficient thermistor based on the spinel structure greatly limits the use of the device in high temperature environments due to its poor aging performance

Method used

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  • A kind of preparation method of high temperature thick film thermistor
  • A kind of preparation method of high temperature thick film thermistor
  • A kind of preparation method of high temperature thick film thermistor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Dissolve lanthanum nitrate, manganese acetate and aluminum nitrate in glacial acetic acid at a molar ratio of La:Mn:Al=1:0.6:0.4 respectively, heat to 60°C, stir, and wait until the dissolution is complete, stop heating and cool to room temperature;

[0019] Mix the three solutions again, continue to stir for 6 hours, adjust to a solution with a concentration of 0.3mol / L, filter, and let stand for 8 hours to obtain a mixed solution;

[0020] Evaporate the mixed solution at a temperature of 110°C to obtain a gel, then heat the gel at a temperature of 300°C to obtain a powder, and then keep the powder at a temperature of 800°C for 1 hour to obtain a crystallized heat-sensitive powder;

[0021] Weigh 80% of heat-sensitive powder and 20% of ethyl cellulose according to the mass ratio, mix and grind for 6 hours, then mix 70% of the ground powder with 30% of terpineol according to the mass ratio, and heat to a temperature of 60°C. Stir and sonicate for 6 hours to obtain a un...

Embodiment 2

[0024] Use lanthanum nitrate, manganese acetate and aluminum nitrate as raw materials, respectively dissolve them in glacial acetic acid according to the molar ratio La:Mn:Al=1:0.7:0.3, heat to 70°C, stir, wait until the dissolution is complete, stop heating, and cool to room temperature;

[0025] Mix the three solutions again, continue to stir for 6 hours, adjust to a solution with a concentration of 0.3mol / L, filter, and let stand for 8 hours to obtain a mixed solution;

[0026] Evaporate the mixed solution at a temperature of 110°C to obtain a gel, then heat the gel at a temperature of 300°C to obtain a powder, and then keep the powder at a temperature of 800°C for 1 hour to obtain a crystallized heat-sensitive powder;

[0027] Weigh 90% of heat-sensitive powder and 10% of ethyl cellulose according to the mass ratio, mix and grind for 6 hours, then mix 60% of the ground powder with 40% of terpineol according to the mass ratio, and heat to a temperature of 60°C. Stir, ultra...

Embodiment 3

[0030] Use lanthanum nitrate, manganese acetate and aluminum nitrate as raw materials, respectively dissolve them in glacial acetic acid according to the molar ratio La:Mn:Al=1:0.5:0.5, heat to 80°C, stir, wait until the dissolution is complete, stop heating, and cool to room temperature ;

[0031] Mix the three solutions again, continue to stir for 6 hours, adjust to a solution with a concentration of 0.3mol / L, filter, and let stand for 8 hours to obtain a mixed solution;

[0032] Evaporate the mixed solution at a temperature of 110°C to obtain a gel, then heat the gel at a temperature of 300°C to obtain a powder, and then keep the powder at 800°C for 1 hour to obtain a crystallized heat-sensitive powder;

[0033] Weigh 85% of heat-sensitive powder and 15% of ethyl cellulose according to the mass ratio, mix and grind for 6 hours, then mix 70% of the ground powder with 30% of terpineol according to the mass ratio, and heat to a temperature of 60°C. Stir and sonicate for 6 hou...

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Abstract

The invention relates to a preparation method of a high-temperature thick-film thermistor. According to the method, lanthanum nitrate, manganese acetate and aluminum nitrate are dissolved in glacial acetic acid respectively, and a purely clear solution is obtained; the solution is evaporated to obtain gel, the gel is heated and crystallized at the high temperature, thermosensitive powder is obtained, the thermosensitive powder and ethyl cellulose are mixed according to a certain mass ratio and ground, the well ground powder and terpilenol are mixed and stirred, and uniform thick film paste is obtained; and finally, the paste is printed on an Al2O3 substrate and subjected to thermal treatment, and the thick-film thermistor is obtained. The film thickness of a prepared thick-film thermistor sample is 25 mu m, the microminiaturization requirement of an electronic device structure is met, good NTC (negative temperature coefficient) characteristics are kept at the temperature of 800 DEG C, and the use requirement of the high-temperature thermistor is met.

Description

technical field [0001] The invention relates to a method for preparing a thick-film thermistor capable of detecting high temperature, and belongs to the technical field of electronic materials. Background technique [0002] In order to meet the control and measurement of electrical equipment under high temperature conditions, higher requirements are put forward for high temperature sensors. Traditional temperature sensors are generally based on AB 2 o 4 The negative temperature coefficient thermistor based on the spinel structure greatly limits the use of the device in a high temperature environment due to its poor aging performance. Perovskite structure ABO 3 Because of its stable performance at high temperature, the thermistor has become a new material system for high temperature thermistor research. Lanthanum manganate base (LaMnO 3 ) As a typical perovskite structure material, it has good NTC characteristics, and Al doping is a means to effectively improve the mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/50C04B35/622
Inventor 徐金宝熊信谦王磊边亮
Owner XINJIANG ZHONGKE SENSING CO LTD