Preparation method of double perovskite type and yttrium oxide compounded negative temperature coefficient thermistor material

A negative temperature coefficient, thermistor technology, applied in the direction of resistors with negative temperature coefficients, resistance manufacturing, resistors, etc., can solve problems such as limitations

Pending Publication Date: 2022-01-28
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

But their application is usually limited to below 300°C

Method used

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  • Preparation method of double perovskite type and yttrium oxide compounded negative temperature coefficient thermistor material
  • Preparation method of double perovskite type and yttrium oxide compounded negative temperature coefficient thermistor material

Examples

Experimental program
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Effect test

Embodiment 1

[0018] a. Mix the raw material MnO with a molar ratio of 8:3:1 2 , Ni 2 O 3 and Co 2 O 3 Accurately weighed, placed in a high-energy ball mill for 7 hours of grinding, and the mass ratio of powder and ball-milling medium was 1:5 to obtain a uniformly mixed powder material;

[0019] b. The powder material obtained in step a is calcined at a temperature of 900 ° C for 2 h to obtain Mn 1.5 Co 0.375 Ni 1.125 O 4 powder;

[0020] c. Mix the raw material Y with a molar ratio of 8:2 2 O 3 with the Mn obtained in step b 1.5 Co 0.375 Ni 1.125 O 4 Accurately weigh, mix and grind again in a high-energy ball mill for 4 hours to obtain a composite phase powder, then add a dispersant triethanolamine with a mass ratio of 1%, and place it in a high-energy ball mill again for uniform mixing and grinding for 6 hours to obtain a composite phase powder;

[0021] d. The composite phase powder of step c is placed in a drying box and dried at a temperature of 70°C, and the dried powder...

Embodiment 2

[0028] a. Mix the raw material MnO with a molar ratio of 8:1:3 2 , Ni 2 O 3 and Co 2 O 3 Accurately weighed, placed in a high-energy ball mill for 6 hours of grinding, and the mass ratio of powder and ball-milling medium was 1:6 to obtain a uniformly mixed powder material;

[0029] b. The powder material obtained in step a is calcined at a temperature of 950 ° C for 3 h to obtain Mn 1.5 Co 1.125 Ni 0.375 O 4 ;

[0030] c. Mix the raw material Y with a molar ratio of 7:3 2 O 3 with the Mn obtained in step b 1.5 Co 1.125 Ni 0.375 O 4 Accurately weighed, and then placed in a high-energy ball mill for uniform mixing and grinding for 6 hours to obtain a composite phase powder. Then, a dispersant maleic acid-acrylic acid copolymer with a mass ratio of 2% was added, and then placed in a high-energy ball mill for uniform mixing and grinding for 6 hours to obtain a composite powder. phase powder;

[0031] d. The composite phase powder of step c is placed in a drying box ...

Embodiment 3

[0038] a. Mix the raw material MnO with a molar ratio of 10:3:2 2 , Ni 2 O 3 and Co 2 O 3 Accurately weighed, placed in a high-energy ball mill for 8 hours of grinding, and the mass ratio of powder and ball milling medium was 2:5 to obtain a uniformly mixed powder material;

[0039] b. The powder material obtained in step a is calcined at a temperature of 1000 ° C for 4 h to obtain Mn 1.5 Co 0.6 Ni 0.9 O 4 powder;

[0040] c. Mix the raw material Y with a molar ratio of 6:4 2 O 3 with the Mn obtained in step b 1.5 Co 0.6 Ni 0.9 O 4 Accurately weigh, mix and grind again in a high-energy ball mill for 8 hours to obtain a composite phase powder, add a dispersant ammonium polyacrylate with a mass ratio of 2%, and place it in a high-energy ball mill again for uniform mixing and grinding for 6 hours to obtain a composite phase powder;

[0041] d. The composite phase powder of step c is placed in a drying box and dried at a temperature of 100 ° C, and the dried powder i...

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Abstract

The invention relates to a preparation method of a double perovskite type and yttrium oxide compounded negative temperature coefficient thermistor material. According to the method, composite powder is formed by taking MnO2, Ni2O3, Co2O3 and Y2O3 as raw materials through high-energy ball milling and adding different dispersing agents. The novel double perovskite type and yttrium oxide compounded negative temperature coefficient thermistor material with the material constant B100-600 DEG C = 3900-4580 K, the temperature of 100 DEG C and the electrical resistivity of 32820-77460 omega.cm is obtained by mixing and ball milling, pre-sintering, re-mixing and ball milling, cold isostatic pressing molding, high-temperature sintering and electrode coating and burning. The composite thermistor material prepared by the method is stable in performance and high in consistency. The thermistor material has obvious negative temperature coefficient characteristics in a range of 100-700 DEG C, and is suitable for manufacturing high-temperature thermistors.

Description

technical field [0001] The invention relates to a preparation method of a negative temperature coefficient thermistor material with a double perovskite structure and a yttrium oxide composite structure. A new type of high temperature thermistor material suitable for manufacturing high temperature thermistors Background technique [0002] Temperature sensors are widely used in aerospace, household appliances, automobiles, medical equipment, agricultural automation and other fields. Recently, there has been growing interest in exploring the negative temperature coefficient (NTC) behavior of novel materials for thermistor applications. NTC (Negative Temperature Coefficient) refers to a material whose resistance decreases exponentially with increasing temperature and has a negative temperature coefficient thermistor phenomenon. Negative temperature coefficient thermistors are used in a wide variety of industrial and domestic applications, such as suppressing inrush currents, t...

Claims

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Application Information

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IPC IPC(8): C04B35/01C04B35/622C04B41/88H01C7/04H01C17/30
CPCC04B35/016C04B35/622C04B41/88C04B41/5122H01C7/043H01C17/30C04B2235/3279C04B2235/3275C04B2235/3225C04B2235/768C04B41/4539C04B41/0072
Inventor 赵青王晓峰何东林常爱民
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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