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Highly stable negative temperature coefficient thermistor suitable for medium temperature region and preparation method thereof

A technology of negative temperature coefficient and thermistor, which is applied in the field of high stability negative temperature coefficient thermistor and its preparation in medium temperature region, and can solve the problems of poor thermal stability of thermistor.

Active Publication Date: 2016-09-14
中科传感(佛山)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because Co ions are more likely to switch their valences, resulting in poor thermal stability of Co-Mn based NTC thermistors.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] a. Accurately weigh and prepare raw materials according to the molar ratio Co:Mn:Fe:Zn=34:28:35:3: cobalt nitrate, ferric nitrate, manganese nitrate and zinc nitrate, add deionized water to prepare a 1mol / L solution, spare;

[0022] b. Accurately weigh ammonium bicarbonate according to the total metal ion content and ammonium bicarbonate molar ratio of 1:1.25, dissolve it in deionized water, and prepare a solution of 1.5mol / L;

[0023] c. Slowly add the mixed solution in step a to the ammonium bicarbonate solution in step b, stir while dripping, and carry out the liquid phase co-precipitation reaction. After the mixed solution is completely dripped, let it stand for 10h, and the precipitate obtained matter and supernatant;

[0024] d. Suction filter the precipitate and supernatant obtained in step c, wash with deionized water and ethanol three times respectively, and suction filter the obtained powder, then dry the powder at a temperature of 60° C. for 24 hours, take i...

Embodiment 2

[0030] a. Accurately weigh and prepare raw materials according to the molar ratio Co:Mn:Fe:Zn=30:30:29:11: cobalt nitrate, ferric nitrate, manganese nitrate and zinc nitrate, add deionized water to prepare a 1mol / L solution, spare;

[0031] b. Accurately weigh ammonium bicarbonate according to the total metal ion content and ammonium bicarbonate molar ratio of 1:1.25, dissolve it in deionized water, and prepare a 1.5mol / L solution for subsequent use;

[0032] c. Slowly add the mixed solution in step a to the ammonium bicarbonate solution in step b, stir while dripping, and carry out the liquid phase co-precipitation reaction. After the mixed solution is completely dripped, let it stand for 24h, and the precipitate obtained matter and supernatant;

[0033] d. Suction-filter the precipitate and supernatant obtained in step c, wash with deionized water and ethanol three times respectively, and suction-filter the obtained powder, then dry the powder at a temperature of 100°C for ...

Embodiment 3

[0039] a. Accurately weigh and prepare raw materials according to the molar ratio Co:Mn:Fe:Zn=45:15:27:13: cobalt nitrate, ferric nitrate, manganese nitrate and zinc nitrate, add deionized water to prepare a 1mol / L solution, spare;

[0040] b. Accurately weigh ammonium bicarbonate according to the total metal ion content and ammonium bicarbonate molar ratio of 1:1.25, dissolve it in deionized water, and prepare a 1.5mol / L solution for subsequent use;

[0041] c. Slowly add the mixed solution in step a to the ammonium bicarbonate solution in step b, stir while dripping, and carry out the liquid phase co-precipitation reaction. After the mixed solution is completely dripped, let it stand for 48h, and the precipitate obtained matter and supernatant;

[0042] d. Suction-filter the precipitate and supernatant obtained in step c, wash with deionized water and ethanol three times respectively, and suction-filter the obtained powder, then dry the powder at a temperature of 120° C. fo...

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Abstract

The invention relates to a high-stability NTC (negative temperature coefficient) thermistor suitable for a medium-temperature zone and a preparation method of the thermistor. The thermistor comprises oxides of four metallic elements including Co, Mn, Fe and Zn, the oxides are subjected to preparation with a coprecipitation method, forming, sintering, slicing, electrodefiring, cutting and packaging, then the high-stability NTC thermistor suitable for the medium-temperature zone is obtained, the standard resistance of the thermistorat the temperature of 25 DEG C ranges from 50-180 kilohms, and the material constant ranges from 3,990 K to 4.270 K. The thermistor device has the standard resistance and material constantsuitable for the medium-temperature zone, can be applied to temperature measurement, control, compensation and the like of equipment such as an automobile, an air conditioner, a microwave oven and the like and has very good stability, consistency and interchangeability, the resistance drift rate is smaller than 0.1% after the thermistor is aged for 1,000 h at the temperature of 150 DEG C, the stability of the conventional NTC thermistor can be improved greatly, the measurement accuracy of the NTC thermistor can be improved, and the service life of the NTC thermistor can be prolonged.

Description

technical field [0001] The invention relates to a high-stable negative temperature coefficient thermistor suitable for a medium temperature zone and a preparation method thereof, in particular to an NTC thermistor with a spinel structure. Background technique [0002] Negative temperature coefficient (NTC) thermistors are widely used in many fields such as industrial production, scientific research, daily life and aviation. However, in actual use, for different application temperatures, different use circuits, etc., the negative temperature coefficient (NTC) thermistor needs to have different standard resistance (25°C resistance) and material constant. In order to meet different application requirements, the development of thermistors with specific standard resistance values ​​and material constants has gradually become one of the research hotspots in the industry. Generally, the resistivity and material constant of NTC thermistor materials are mainly affected by the materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/34C04B35/622
Inventor 张惠敏程飞常爱民
Owner 中科传感(佛山)科技有限公司
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