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A kind of perovskite type high temperature thermistor material and preparation method thereof

A perovskite-type, thermistor technology, applied to resistors with negative temperature coefficients, resistors, non-adjustable metal resistors, etc., can solve the problems of difficult linearization and increased sensor response time. Stable performance and good consistency

Active Publication Date: 2020-11-06
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The platinum film resistance temperature sensor relies on the resistance-temperature linearization characteristic to realize temperature measurement. When it is lower than 500°C, it can be fully linearized. However, due to the characteristics of the platinum metal material itself, it is difficult to achieve linearization at high temperatures.
In addition, in order to improve the sensitivity, it is necessary to use manufacturing technology to increase the size of the element, which increases the response time of the sensor with the increase in size, resulting in a contradiction in performance improvement.
[0003] Negative temperature coefficient thermistors have the characteristics of high sensitivity and fast response. However, traditional Mn-Co-Ni-O spinel-type thermistor materials are mainly used below 300°C, which makes the new high-temperature thermistor Development of Resistive Materials Presents New Challenging Topics

Method used

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  • A kind of perovskite type high temperature thermistor material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] a. First press CaCu 2.5 mn 0.5 Ti 4 o 12 Weigh and mix analytically pure calcium carbonate, copper oxide, manganese dioxide and titanium dioxide respectively, place the mixed raw materials in an agate mortar and grind for 5 hours to obtain a powder;

[0017] b. Calcinate the ground powder in step a at a temperature of 800°C for 4 hours, and grind for 5 hours to obtain CaCu 2.5 mn 0.5 Ti 4 o 12 Powder;

[0018] c, the powder material that step b obtains is with 20Kg / cm 2 The pressure is briquetted for 1 minute, and the formed block material is subjected to cold isostatic pressing, kept at a pressure of 300MPa for 2 minutes, and then sintered at a temperature of 1000°C for 8 hours to obtain a high-temperature heat-sensitive ceramic material ;

[0019] d. Coat the front and back sides of the ceramic material sintered in step c with platinum paste electrodes, and then anneal at 900°C for 30 minutes to obtain a temperature range of 25°C-800°C and a material constant...

Embodiment 2

[0021] a. Press Ca 0.95 Y 0.05 Cu 2.5 mn 0.5 Ti 4 o 12 Weighing calcium carbonate, copper oxide, manganese dioxide, titanium dioxide, and yttrium trioxide were mixed respectively, and the mixed raw materials were placed in an agate mortar and ground for 10 hours to obtain a powder;

[0022] b. Calcinate the ground powder in step a at a temperature of 900°C for 6 hours, and then grind for 8 hours to obtain Ca 0.95 Y 0.05 Cu 2.5 mn 0.5 Ti 4 o 12 Powder;

[0023] c, the powder material that step b obtains is with 15Kg / cm 2 The pressure of briquetting is carried out for 0.5 minutes, and the formed block material is subjected to cold isostatic pressing, kept at a pressure of 400MPa for 1 minute, and then sintered at a temperature of 1100°C for 6 hours to obtain a high-temperature heat-sensitive ceramic material ;

[0024] d. Coat the front and back sides of the ceramic material sintered in step c with platinum paste electrodes, and then anneal at a temperature of 900°C...

Embodiment 3

[0026] a. Press Ca 0.9 Y 0.1 Cu 2.5 mn 0.5 Ti 4 o 12 Weighing calcium carbonate, copper oxide, manganese dioxide, titanium dioxide, and yttrium trioxide were mixed respectively, and the mixed raw materials were placed in an agate mortar and ground for 8 hours to obtain a powder;

[0027] b. Calcining the ground powder in step a at a temperature of 1000°C for 8 hours, and then grinding for 10 hours to obtain Ca 0.9 Y 0.1 Cu 2.5 mn 0.5 Ti 4 o 12 Powder;

[0028]c, the powder material that step b obtains is with 10Kg / 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 350MPa for 3 minutes, and then sintered at a temperature of 1200°C for 4 hours to obtain a high-temperature heat-sensitive ceramic material ;

[0029] d. Coat the front and back sides of the ceramic material sintered in step c with platinum paste electrodes, and then anneal at a temperature of 900°C for 30 minutes to...

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Abstract

The invention relates to a perovskite type high-temperature thermistor material and a preparation method thereof. The method comprises the following steps: by taking analytically pure calcium carbonate, copper oxide, manganese dioxide, titanium dioxide and yttria as raw materials, mixing and milling; calcining; performing isostatic cool pressing molding; sintering under a high temperature; coating and burning an electrode, thereby acquiring a Ca(1-x)YxCu2.5Mn0.5Ti4O12 (x more than or equal to 0 but less than or equal to 0.1) thermal sensitive ceramic material with a perovskite structure, wherein the material constant is B300 DEG C / 500 DEG C=6800K-7700K and the specific resistance at 25 DEG C is 1.09*10<7>omegacm-3.60*10<7>omegacm. The thermistor material prepared according to the invention has an obvious negative temperature coefficient characteristic within the scope of 25 DEG C-800 DEG C; the electrical property of the material system is stable; and the material is consistent and is suitable for the manufacturing of a high-temperature thermistor.

Description

technical field [0001] The invention relates to a perovskite-like high-temperature thermistor material and a preparation method thereof. The thermistor material has obvious negative temperature coefficient characteristics in the temperature range of 25°C-800°C, and is suitable for manufacturing high-temperature thermistors. new thermistor material for devices. Background technique [0002] At present, platinum resistors are mainly used for high temperature detection at home and abroad. Platinum resistance temperature detectors have a long history of being used to measure temperatures below 600°C, and current developments are mainly focused on thin and thick platinum films, that is, film-type resistance temperature detection with a thin film on a ceramic material device. After the latest improvement, it can measure the temperature up to 850℃. The platinum film resistance temperature sensor relies on the resistance-temperature linearization characteristic to realize tempera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/04C04B35/462C04B35/622C04B41/88
CPCC04B35/462C04B35/622C04B41/5122C04B41/88C04B2235/3208C04B2235/3225C04B2235/3267C04B2235/3281C04B2235/768H01C7/041H01C7/045C04B41/4539C04B41/0072
Inventor 张博常爱民杨田
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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