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Strontium-doped lanthanum chromite thermistor material

A thermistor and lanthanum chromate technology, applied in the direction of resistors, non-adjustable metal resistors, resistors with negative temperature coefficient, etc., can solve the problems of difficult material densification, high vapor pressure, and limited application range

Inactive Publication Date: 2016-07-13
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

However, since LaCrO 3 The vapor pressure of chromium in the material is relatively high, and it is easy to volatilize during the sintering process, which makes it difficult to densify the material, which limits its application range

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] by LaCrO 3 33.9867g of analytically pure lanthanum trioxide and 16.0133g of analytically pure chromium trioxide were weighed and mixed, and the mixed raw materials were placed in an agate mortar for grinding for 4 hours to obtain oxide powder;

[0019] Calcinate the ground oxide powder at a temperature of 800°C for 3 hours, and then grind it for 6 hours to obtain LaCrO 3 Powder;

[0020] Will get LaCrO 3 Powder material at 30Kg / cm 2 The pressure is used for briquetting, and the time is 1 minute. The formed block material is subjected to cold isostatic pressing, kept at a pressure of 150 MPa for 1 minute, and then sintered at a temperature of 1200 ° C for 1 hour to obtain strontium-doped lanthanum chromate Thermistor material;

[0021] The front and back sides of the sintered strontium-doped lanthanum chromate thermistor material are coated with platinum paste electrodes, and then annealed at a temperature of 1200°C for 2 hours to obtain a circle of strontium-doped l...

Embodiment 2

[0024] Press La 0.92 Sr 0.08 CrO 3 The composition of analytical pure lanthanum trioxide 31.4125g, analytical pure chromium trioxide 16.0874g and analytical pure strontium carbonate 2.5001g are mixed respectively, and the mixed raw materials are placed in an agate mortar for grinding for 5 hours. Obtain oxide powder;

[0025] Calcinate the ground oxide powder at a temperature of 950°C for 4 hours, and grind for 7 hours to obtain La 0.92 Sr 0.08 CrO 3 Powder;

[0026] Will get LaCrO 3 Powder material at 30Kg / cm 2 The pressure is briquetted for 2 minutes, and the formed block material is subjected to cold isostatic pressing, kept at a pressure of 200 MPa for 3 minutes, and then sintered at a temperature of 1300 ° C for 3 hours to obtain strontium-doped lanthanum chromate Thermistor material;

[0027] The front and back sides of the sintered strontium-doped lanthanum chromate thermistor material are coated with platinum paste electrodes, and then annealed at a temperatur...

Embodiment 3

[0030] Press La 0.88 Sr 0.12 CrO 3 The composition of analytical pure lanthanum trioxide 30.1164g, analytical pure chromium trioxide 16.1247g and analytical pure strontium carbonate 3.7589g are mixed, and the mixed raw materials are placed in an agate mortar for grinding for 6 hours to obtain oxide powder;

[0031] Calcinate the ground oxide powder at a temperature of 1200°C for 5 hours, and grind for 8 hours to obtain La 0.88 Sr 0.12 CrO 3 Powder;

[0032] Will get LaCrO 3 Powder material at 40Kg / cm 2 The pressure is briquetted for 3 minutes, and the formed block material is subjected to cold isostatic pressing, kept at a pressure of 250MPa for 3 minutes, and then sintered at a temperature of 1400°C for 3 hours to obtain strontium-doped lanthanum chromate Thermistor material;

[0033] The front and back sides of the sintered strontium-doped lanthanum chromate thermistor material are coated with platinum paste electrodes, and then annealed at a temperature of 1200°C f...

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Abstract

The invention relates to a thermistor material based on La1-xSrxCrO3.According to the material, lanthanum oxide, chromic oxide and strontium carbonate serve as raw materials and are subjected to mixing, grinding, roasting, grinding, cold isostatic pressing forming and high-temperature sintering, and the La1-xSrxCrO (0<=x<=0.5) strontium-doped lanthanum chromite thermistor material of a perovskite structure can be obtained.The constant of the material is B-80 DEG C / -40 DEG C=(1200-4200)*(1+ / -2%) K, the resistivity at the temperature of -80 DEG C is (6*10<5>-20) Ohm.cm, and the resistance change rate after aging is conducted for 300 h at the temperature of 100 DEG C is within + / -10%.The strontium-doped lanthanum chromite thermistor material prepared through the method has the negative temperature coefficient characteristic, and is stable in material system electric performance, good in consistence, stable in aging performance and suitable for manufacturing thermistors used in the low-temperature environment.

Description

technical field [0001] The invention relates to a strontium-doped lanthanum chromate La 1-x Sr x CrO 3 The thermistor material, the thermistor material has obvious negative temperature coefficient characteristics, is a new type of thermistor material suitable for manufacturing thermistors, and belongs to the field of semiconductor sensors. Background technique [0002] Sensitive components and sensors are one of the key development areas of my country's electronics industry and one of the three pillars of the electronic information industry determined by the state. They are considered to be the most promising electronic technology products. Negative temperature coefficient thermistors have the advantages of low price, high temperature measurement accuracy, good reliability, and remote control and measurement. They are widely used in household appliances, medical, automotive and other industries. [0003] In recent years, the design and development of new thermistor materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50H01C7/04
CPCC04B35/50C04B2235/3213C04B2235/3241H01C7/043
Inventor 张博罗萍赵青常爱民
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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