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A niobium-doped manganese-nickel-based negative temperature coefficient thermistor and its preparation method

A technology of negative temperature coefficient and thermistor, applied in the direction of resistors with negative temperature coefficient, resistors, non-adjustable metal resistors, etc. Uniformity, limited uniformity and stability and other issues, to achieve the effect of stable structure, low sintering temperature and simple material composition

Active Publication Date: 2020-12-25
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because some ionic radii in the perovskite phase are large, they cannot be solid-solubilized with the spinel structure, which causes problems such as two-phase separation, phase distribution, and two-phase infiltration in the composite structure. Therefore, in a certain Limits the homogeneity and stability of the two composites to a certain extent

Method used

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  • A niobium-doped manganese-nickel-based negative temperature coefficient thermistor and its preparation method
  • A niobium-doped manganese-nickel-based negative temperature coefficient thermistor and its preparation method
  • A niobium-doped manganese-nickel-based negative temperature coefficient thermistor and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation by solid phase method:

[0024] a. Press the raw material according to Mn 2.25 Ni 0.74 Nb 0.01 O formula ingredients, where x = 0.01, weighed MnO 2 19.5g, Ni 2 o 3 6.12g and Nb 2 o 5 0.13g, put it into a 500mL polytetrafluoroethylene ball mill jar, then add 50 agate balls with a diameter of 50mm into the ball mill jar, place the ball mill jar on a planetary ball mill, and grind for 8 hours;

[0025] b. Dry the ground product obtained in step a in an oven at a temperature of 100°C for 24 hours, take it out, place it in an agate grinder, and grind it manually until it becomes powdery;

[0026] c. Put the powder obtained in step b in an alumina crucible pre-fired at a temperature of 1200°C, pre-fire at a temperature of 800°C for 1 hour, and then hand-grind for 2 hours after sintering to obtain a heat-sensitive powder material ;

[0027] d. Press the powder obtained in step c into a green body, and sinter at a temperature of 1200° C. for 2 hours to obt...

Embodiment 2

[0031] Preparation by solid phase method:

[0032] a. Press the raw material according to Mn 2.25 Ni 0.6 Nb 0.15 O formula ingredients, wherein x=0.15-0.35, weigh MnO 2 35g, Ni 2 o 3 20g and Nb 2 o 5 2.3g, put it into a 500mL polytetrafluoroethylene ball mill jar, then add 150 agate balls with a diameter of 50mm into the ball mill jar, place the ball mill jar on a planetary ball mill, and grind for 8 hours;

[0033] b. Dry the ground product obtained in step a in an oven at a temperature of 100°C for 24 hours, take it out, place it in an agate grinder, and grind it manually until it becomes powdery;

[0034] c. Put the powder obtained in step b in an alumina crucible pre-fired at a temperature of 1200°C, pre-fire at a temperature of 800°C for 1 hour, and then hand-grind for 2 hours after sintering to obtain a heat-sensitive powder material ;

[0035] d. Press the powder obtained in step c into a green body, and sinter at a temperature of 1200° C. for 2 hours to obtai...

Embodiment 3

[0039] Preparation by solid phase method:

[0040] a. Press the raw material according to Mn 2.25 Ni 0.5 Nb 0.25 O formula ingredient, wherein x=0.25, weighs MnSO 4 40g, Ni 2 (SO 4 ) 3 5.5g and Nb 2 (SO 4 ) 5 4.0g, put into a 500mL polytetrafluoroethylene ball mill jar, then add 150 agate balls with a diameter of 50mm in the ball mill jar, place the ball mill jar on a planetary ball mill, and grind for 8 hours;

[0041] b. Dry the ground product obtained in step a in an oven at a temperature of 100°C for 24 hours, take it out, place it in an agate grinder, and grind it manually until it becomes powdery;

[0042] c. Put the powder obtained in step b in an alumina crucible pre-fired at a temperature of 1200°C, pre-fire at a temperature of 800°C for 1 hour, and then hand-grind for 2 hours after sintering to obtain a heat-sensitive powder material ;

[0043] d. Press the powder obtained in step c into a green body, and sinter at a temperature of 1200° C. for 2 hours t...

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Abstract

The invention relates to a niobium-doped manganese-nickel-based negative temperature coefficient thermistor and a preparation method thereof. The material contains three elements of Mn, Ni and Nb andis prepared from an ingredient of Mn2.25Ni(0.75-x)NbxO, wherein the x is equal to 0.01 to 0.35. By means of adjusting the niobium element doping amount in a formula and effectively adjusting the specific resistance and the material constant of a traditional manganese-nickel-based binary thermistor material, the specific resistance and the material constant of the thermistor material can be adjusted. The niobium-doped manganese-nickel-based negative temperature coefficient thermistor material prepared by the method disclosed by the invention has a thermistor material system of a high-purity single-phase structure with high-B low-resistance characteristics. The specific resistivity and the material constant B value of a thermistor element can be adjusted by changing a small amount of doped niobium, so that the material has the advantages of high performance stability, high stability, opposite-trend change of the specific resistivity and the material constant B value and the like; the material can be prepared into chip type thermosensitive elements and has a wide application prospect in the field of temperature measurement and control.

Description

technical field [0001] The invention relates to a novel negative temperature coefficient thermistor material, which mainly adopts niobium-doped manganese-nickel-based oxide. It is suitable for various application fields such as temperature measurement, control and compensation. Background technique [0002] Manganese-nickel-based spinel oxide NTC thermistor material is the most common heat-sensitive material. Thermistor elements prepared with this system material have been widely used in home appliances, automobiles, industry, aviation, military and other fields. temperature measurement and control. The resistivity (0.1-10 3 Effective adjustment of the material constant B value (in the range of kΩ·cm) and material constant (in the range of 2000-7000K). However, the intrinsic characteristics of spinel structure oxide materials determine that their resistivity changes with the activation energy of the material. When the B value of the spinel structure thin film material is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/04C04B35/01C04B41/88
CPCC04B35/01C04B41/009C04B41/5116C04B41/88C04B2235/3251C04B2235/3279C04B2235/96H01C7/043
Inventor 孔雯雯程飞鹏常爱民姚金城
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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