A kind of neodymium-doped scheelite structure negative temperature coefficient thermistor material and preparation method thereof

A technology of negative temperature coefficient and thermistor, applied to resistors with negative temperature coefficient, resistors, non-adjustable metal resistors, etc., can solve problems such as poor stability, narrow operating temperature range, and changes in electrical properties of materials , to achieve stable performance

Active Publication Date: 2021-12-07
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

The traditional spinel structure NTC has certain limitations, the operating temperature range is narrow from -50°C to 300°C, and the stability of multi-system ceramic materials composed of spinel structure is poor, and the material is in a non-equilibrium state after sintering , resulting in changes in the electrical properties of materials and limiting their development

Method used

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  • A kind of neodymium-doped scheelite structure negative temperature coefficient thermistor material and preparation method thereof
  • A kind of neodymium-doped scheelite structure negative temperature coefficient thermistor material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] a, with CaCO 3 , CeO 2 , Nb 2 o 5 、WO 3 and Nd 2 o 3 As a raw material, its chemical formula is CaCeNbWO 8 , molar ratio of raw material to CaCO 3 :CeO 2 :Nb 2 o 5 :WO 3 =0.4:0.4:0.2:0.4 weighed, placed in an agate mortar and ground for 6 hours, fully mixed uniformly to obtain a powder;

[0020] b. Calcining the powder obtained in step a at a temperature of 1100° C. for 3 hours, and then grinding for 4 hours. Repeat this process twice to obtain a thermistor powder;

[0021] c, the powder obtained in step b is 30Kg / cm 2 The pressure is briquetted for 1 minute, and the formed block is subjected to cold isostatic pressing, and the pressure is maintained at 200 MPa for 1 minute, and then the block is sintered at 1350 ° C for 3 hours to obtain a neodymium-doped scheelite structure. Calcium cerium niobium tungsten ceramic materials;

[0022] d. Coating the front and back sides of the ceramic material obtained in step c with platinum slurry electrodes, and then a...

Embodiment 2

[0025] a, with CaCO 3 , CeO 2 , Nb 2 o 5 、WO 3 and Nd 2 o 3 As raw material, its general chemical formula is Ca 0.9 Nd 0.1 CaB 8 , molar ratio of raw material to CaCO 3 :CeO 2 :Nb 2 o 5 :WO 3 :Nd 2 o 3=0.36:0.4:0.2:0.4:0.02 weighed, placed in an agate mortar and ground for 7 hours, fully mixed to obtain a powder;

[0026] b. Calcining the powder obtained in step a at a temperature of 1200° C. for 3 hours, and then grinding for 5 hours. Repeat this process twice to obtain a thermistor powder;

[0027] c, the thermistor powder that step b obtains with 40Kg / cm 2 The pressure is briquetted for 2 minutes, and the formed block is subjected to cold isostatic pressing, and the pressure is kept at 300 MPa for 2 minutes, and then the block is sintered at 1300 ° C for 6 hours to obtain a neodymium-doped scheelite structure. Calcium cerium niobium tungsten ceramic materials;

[0028] d. Coating the front and back sides of the ceramic material obtained in step c with plat...

Embodiment 3

[0031] a, with CaCO 3 , CeO 2 , Nb 2 o 5 、WO 3 and Nd 2 o 3 As raw material, its general chemical formula is Ca 0.8 Nd 0.2 CaB 8 , molar ratio of raw material to CaCO 3 :CeO 2 :Nb 2 o 5 :WO 3 :Nd 2 o 3 =0.32:0.4:0.2:0.4:0.04 weighed, placed in an agate mortar and ground for 7 hours, fully mixed to obtain a powder;

[0032] b. Calcining the powder obtained in step a at a temperature of 1200° C. for 4 hours, and then grinding for 6 hours. Repeat this process twice to obtain a thermistor powder;

[0033] c, the thermistor powder that step b obtains with 40Kg / cm 2 The pressure is briquetted for 2 minutes, 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 1300 ° C for 9 hours to obtain a neodymium-doped scheelite structure Calcium cerium niobium tungsten ceramic materials;

[0034] d. Coat the front and back sides of the ceramic material obtained in step c with platinum pa...

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Abstract

The invention relates to a neodymium-doped scheelite structure negative temperature coefficient thermistor material and a preparation method thereof. The material is made of CaCO 3 , CeO 2 , Nb 2 o 5 、WO 3 and Nd 2 o 3 As a raw material, Ca 1‑x Nd x CaB 8 Thermistor ceramic material, where 0≤x≤0.9, its electrical performance parameters are: B 25℃ / 50℃ =4052‑6563K±6%, ρ 25℃ =0.102‑1.76×10 9 Ω·cm±7%, the change rate of resistance value is within ±6.19% after aging at 500℃ for 500 hours. The neodymium-doped scheelite structure negative temperature coefficient thermistor material prepared by the invention has obvious negative temperature coefficient characteristics in the temperature range of 0°C-600°C, and the material system has stable electrical properties, good consistency, and excellent aging performance. Stable, is a new type of thermistor material suitable for manufacturing wide temperature range thermistors.

Description

technical field [0001] The invention relates to a neodymium-doped scheelite structure negative temperature coefficient thermistor material and a preparation method thereof. The thermistor material has obvious negative temperature coefficient characteristics in the range of 0°C-600°C, and is an applicable The invention relates to a new thermistor for manufacturing wide-temperature thermistors, which belongs to the field of semiconductor sensors. Background technique [0002] Sensitive components and sensors are one of the three pillars of the electronic information industry determined by the state, and are now considered to be the most promising electronic technology products. The development of sensitive components plays a decisive role in improving the status of my country's electronic industry in the world . Among them, wide temperature zone thermistors have broad application prospects in traditional home appliances, information industries, medical, automotive, geological ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/495C04B35/622C04B35/626C04B41/88H01C7/04
CPCC04B35/495C04B35/622C04B35/62605C04B41/009C04B41/5116C04B41/88C04B2235/3208C04B2235/3229C04B2235/3251C04B2235/6567C04B2235/662H01C7/043C04B41/4539C04B41/0072
Inventor 张惠敏李晓卉常爱民
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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