Titanate system negative temperature coefficient thermistor material and preparation method thereof

A negative temperature coefficient and thermistor technology, applied in the field of titanate system negative temperature coefficient thermistor material and preparation, to achieve stable aging performance, stable performance and good consistency

Pending Publication Date: 2021-06-11
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

Although some progress has been made, most of the reported materials have a maximum temperature upper limit of only 800 °C, therefore, it is of great significance to study thermistor materials that can be applied at temperatures exceeding 800 °C

Method used

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  • Titanate system negative temperature coefficient thermistor material and preparation method thereof
  • Titanate system negative temperature coefficient thermistor material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] a. Press Eu 2 Ti 2 o 7 The composition of titanium dioxide and europium trioxide was weighed and mixed, placed in an agate ball mill jar, using analytically pure anhydrous ethanol as the dispersion medium, wet milled for 8 hours, and dried the wet milled slurry at a temperature of 60°C. Take out and grind for 1 hour to obtain powder;

[0021] b. Mix the powder obtained in step a with 20kg / cm 2 The pressure of briquetting is carried out for 0.5min, and the formed block is subjected to cold isostatic pressing, and the pressure is kept at 300MPa for 3min, and then the block is sintered at a temperature of 1450°C for 6h, and the negative temperature of europium titanate is obtained. coefficient thermistor material;

[0022] c. The front and back sides of the europium titanate negative temperature coefficient thermistor material obtained in step b are coated with platinum paste electrodes, and then annealed at a temperature of 900°C for 0.5h, and the electrical performan...

Embodiment 2

[0024] a. Press Eu 2 Ti 2 o 7 The composition of titanium dioxide and europium trioxide was weighed and mixed, placed in an agate ball mill jar, using analytically pure anhydrous ethanol as the dispersion medium, wet milled for 8 hours, and dried the wet milled slurry at a temperature of 60°C. Take out and grind for 2 hours to obtain powder;

[0025] b. Mix the powder obtained in step a with 15kg / cm 2 The pressure is briquetted for 1 minute, and the formed block is subjected to cold isostatic pressing, and the pressure is kept at 300 MPa for 3 minutes, and then the block is sintered at a temperature of 1460 ° C for 4 hours to obtain a negative temperature coefficient of europium titanate Thermistor material;

[0026] c. The front and back sides of the europium titanate negative temperature coefficient thermistor material obtained in step b are coated with platinum paste electrodes, and then annealed at a temperature of 900°C for 0.5h, and the electrical performance paramet...

Embodiment 3

[0028] a. Press Dy 2 Ti 2 o 7 The composition of titanium dioxide and dysprosium trioxide was weighed and mixed, placed in an agate ball mill jar, using analytically pure anhydrous ethanol as the dispersion medium, wet milled for 8 hours, and dried the wet milled slurry at a temperature of 60°C. Take out and grind for 1.5h to obtain powder;

[0029]b. Mix the powder obtained in step a with 18kg / cm 2 The pressure is briquetted for 0.8 minutes, and the formed block is subjected to cold isostatic pressing, and the pressure is kept at 300 MPa for 3 minutes, and then the block is sintered at a temperature of 1440 ° C for 6 hours, and the negative temperature of dysprosium titanate is obtained. coefficient thermistor material;

[0030] c. Coat the front and back sides of the dysprosium titanate negative temperature coefficient thermistor material obtained in step b with platinum paste electrodes, and then anneal at a temperature of 900°C for 0.5h, and the electrical performance ...

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Abstract

The invention relates to a titanate system negative temperature coefficient thermistor material and a preparation method thereof. The thermistor material is prepared by the steps that a raw material titanium dioxide is mixed with europium oxide, dysprosium oxide, holmium oxide or yttrium oxide, ball milling, cold isostatic pressing forming and high-temperature sintering are conducted, and the titanate system material is obtained; the electrical property parameters of the system material are as follows: B400 DEG C / 1200 DEG C=12817.584-16734.735 K, and Rho 1200 DEG C=788.613-1013.228 omega.cm. The titanate system negative temperature coefficient thermistor material has obvious negative temperature coefficient characteristics in a temperature range of 400-1200 DEG C, is stable in electrical property, good in consistency, stable in aging performance and insensitive to oxygen partial pressure, and is a thermistor material suitable for manufacturing thermistors used in a high-temperature environment.

Description

technical field [0001] The invention relates to a titanate system negative temperature coefficient thermistor material and a preparation method thereof. The system thermistor material has obvious negative temperature coefficient characteristics and insensitivity to oxygen partial pressure in the range of 400°C-1200°C, and belongs to field of semiconductor sensors. Background technique [0002] With the booming automotive, electronics, military, and aerospace industries, negative temperature coefficient (NTC) thermistors have attracted great attention due to the growing demand for sensors with high accuracy and withstanding harsh environments. NTC thermistor refers to a type of resistor whose resistance decreases exponentially with the increase of temperature. However, the existing relatively mature NTC ceramic temperature sensors are usually of spinel structure. The spinel NTC thermistor is prone to irreversible phase change and ion rearrangement due to this structure at hi...

Claims

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Application Information

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IPC IPC(8): C04B35/50C04B35/462C04B41/88
CPCC04B35/50C04B35/462C04B41/88C04B41/009C04B41/5122C04B2235/96C04B41/4539
Inventor 高博康鑫李晓卉陈肖伊常爱民
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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