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Wide-warm-area negative temperature coefficient thermistor material

A technology of negative temperature coefficient and thermistor, which is applied to resistors with negative temperature coefficient, etc., can solve the problem of difficulty in obtaining low B and high resistance characteristics, and achieve the effect of good consistency and stable performance.

Inactive Publication Date: 2012-08-08
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

Transition metal oxide multi-element ceramics, which have been widely studied and applied, are a kind of thermally sensitive material with a relatively stable negative temperature coefficient. However, almost all research results show that it is difficult to obtain low B and high resistance characteristics for this type of material. The reason is Because the main crystal phase of this kind of material is usually spinel structure, when the material resistivity is high, its B value is also large, conversely, the material with low resistivity, B value is also small

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] a, the molar ratio is: lanthanum: chromium: manganese=1: 0.5: 0.5 Weigh respectively analytically pure lanthanum trioxide, chromium trioxide, and manganese dioxide to mix, place in an agate ball mill jar, to analyze pure Water ethanol is used as the dispersion medium, wet milled for 8 hours, the slurry after wet milling is dried at 80°C, and milled for 1 hour;

[0019] b. Calcinate the powder ground in step a at a temperature of 1100°C for 5 hours, and then grind it for 7 hours to obtain a composition of LaCr 0.5 mn 0.5 o 3 The powder, spare;

[0020] c. Molar ratio: CeO 2 : LaCr 0.5 mn 0.5 o 3 =0.6:0.4 Weigh the LaCr obtained in analytically pure ceria and step b respectively 0.5 mn 0.5 o 3 Mix the powders, place them in an agate ball mill jar, use analytical pure anhydrous ethanol as the dispersion medium, wet mill for 8 hours, dry the wet milled slurry at a temperature of 80°C, and mill for 1 hour;

[0021] d. Calcinate the ground powder in step c at a temp...

Embodiment 2

[0026] a, the molar ratio is: lanthanum: chromium: manganese=1: 0.5: 0.5 Weigh respectively analytically pure lanthanum trioxide, chromium trioxide, and manganese dioxide to mix, place in an agate ball mill jar, to analyze pure Water and ethanol as the dispersion medium, wet milling for 8 hours, drying the wet milled slurry at a temperature of 80°C, and milling for 1 hour;

[0027] b. Calcinate the ground powder in step a at a temperature of 900°C for 3 hours, and grind for 6 hours to obtain a composition of LaCr 0.5 mn 0.5 o 3 The powder, spare;

[0028] c. The molar ratio is: Y 2 o 3 : CeO 2 : LaCr 0.5 mn 0.5 o 3 = 0.1: 0.5: 0.4, respectively weigh analytically pure ceria, yttria and the LaCr obtained in step b 0.5 mn 0.5 o 3 Mix the powders, place them in an agate ball mill jar, use analytical pure anhydrous ethanol as the dispersion medium, wet mill for 8 hours, dry the wet milled slurry at a temperature of 80°C, and mill for 1 hour;

[0029] d. Calcinate the g...

Embodiment 3

[0034] a, the molar ratio is: lanthanum: chromium: manganese=1: 0.5: 0.5 Weigh respectively analytically pure lanthanum trioxide, chromium trioxide, and manganese dioxide to mix, place in an agate ball mill jar, to analyze pure Water and ethanol as the dispersion medium, wet milling for 8 hours, drying the wet milled slurry at a temperature of 80°C, and milling for 1 hour;

[0035] b. Calcinate the ground powder in step a at a temperature of 1000°C for 4 hours, and grind for 8 hours to obtain a composition of LaCr 0.5 mn 0.5 o 3 The powder, spare;

[0036] c. The molar ratio is: Y 2 o 3 : CeO 2 : LaCr 0.5 mn 0.5 o 3 =0.2: 0.4: 0.4 Take by weighing analytically pure diyttrium trioxide, ceria and the LaCr that step b gains respectively 0.5 mn 0.5 o 3 Mix the powders, place them in an agate ball mill jar, use analytical pure anhydrous ethanol as the dispersion medium, wet mill for 8 hours, dry the wet milled slurry at a temperature of 80°C, and mill for 1 hour;

[003...

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Abstract

The invention relates to a wide-warm-area negative temperature coefficient thermistor material, which uses an analytical pure yttria, ceric oxide, lanthanum oxide, chromium sesquloxide and the manganese dioxide as taw materials. The wide-warm-area negative temperature coefficient thermistor material can be obtained after the raw materials are ground, calcined, formed and sintered at the high temperature. The material is a compound material formed by rare earth oxide of Y2O3 and CeO2 and a perovskite structure of LaCr0.5Mn0.5O3, the material constant is B25 DEG C / 85 DEG C = 2,100K - 2,600 + / - 2%, and a resistance value of 25 DEG C is 3 kliohm - 160 kilohm + / -8%. The thermistor material is stable in performance and good in consistency, has obvious negative temperature coefficient performance at the range of 0 DEG C to 300 DEG C and is suitable for manufacturing wide-warm-area thermal resistors.

Description

technical field [0001] The invention relates to a wide temperature range negative temperature coefficient thermistor material. The thermistor material has obvious negative temperature coefficient characteristics in the range of (0°C-300°C), and is a new type of thermistor material suitable for manufacturing wide temperature range thermistors. Background technique [0002] It is generally considered that a thermistor whose temperature range can reach 250°C or wider is a wide temperature range thermistor. Wide temperature zone thermistor is an ideal product to replace industrial metal sensors, has broad prospects, and has become one of the four main topics in the thermistor field. Wide temperature range thermistors are generally used in conjunction with digital instruments. This requires that the resistance value of the thermistor in the wide temperature range does not change by more than three orders of magnitude in the use temperature range and the resistance value at the ...

Claims

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Application Information

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IPC IPC(8): C04B35/50C04B35/505C04B35/622H01C7/04
Inventor 赵青张博常爱民赵鹏君关芳
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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