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Tungsten bronze type high-temperature thermistor material and preparation method thereof

A technology of tungsten bronze and sensitive resistors, which is applied in the field of new thermistor materials, can solve the problems of deterioration of thermal performance and unstable phase structure, and achieve the effect of good consistency and stable performance

Active Publication Date: 2021-06-22
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, the phase structure of the spinel structure thermistor material is unstable at high temperature, and the thermal performance deteriorates. It is mainly used for temperatures below 300°C.

Method used

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  • Tungsten bronze type high-temperature thermistor material and preparation method thereof
  • Tungsten bronze type high-temperature thermistor material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] a. First press BaSm 2 Ti 4 o 12 6.8642g of analytically pure barium carbonate, 12.0204g of samarium trioxide and 11.1154g of titanium dioxide were weighed and mixed respectively, and the mixed raw materials were placed in an agate mortar and ground for 6 hours to obtain a powder;

[0021] b. Calcinate the ground powder in step a at a temperature of 1000°C for 4 hours, and then grind for 5 hours to obtain BaSm 2 Ti 4 o 12 Powder;

[0022] c, the powder material that step b obtains is with 10Kg / cm 2 The pressure is briquetted for 0.5 minutes, and the formed block material is subjected to cold isostatic pressing, kept at a pressure of 250MPa for 1 minute, and then sintered at a temperature of 1300°C for 4 hours to obtain a high-temperature heat-sensitive ceramic material ;

[0023] 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 negative temperature coeffi...

Embodiment 2

[0025] a. Press BaSm 2 Ti 4 o 12 The composition of barium carbonate 6.8642g, samarium trioxide 12.0204g and titanium dioxide 11.1154g were weighed and mixed respectively, and the mixed raw materials were placed in an agate mortar and ground for 7 hours to obtain a powder;

[0026] b. Calcinate the ground powder in step a at a temperature of 1125°C for 5 hours, and grind for 6 hours to obtain BaSm 2 Ti 4 o 12 Powder;

[0027] c, the powder material that step b obtains is with 15Kg / 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 1325°C for 5 hours to obtain a high-temperature heat-sensitive ceramic material ;

[0028] 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 obtain a negative temperature coefficien...

Embodiment 3

[0030] a. Press BaSm 2 Ti 4 o 12 The composition of barium carbonate 6.8642g, samarium trioxide 12.0204g and titanium dioxide 11.1154g were weighed respectively and mixed, and the mixed raw materials were placed in an agate mortar and ground for 8 hours to obtain a powder;

[0031] b. Calcinate the ground powder in step a at a temperature of 1150°C for 6 hours, and grind for 7 hours to obtain BaSm2 Ti 4 o 12 Powder;

[0032] c, the powder material that step b obtains is with 15Kg / cm 2 The pressure is briquetted, and the time is 1 minute. The formed block material is subjected to cold isostatic pressing, kept at a pressure of 300 MPa for 3 minutes, and then sintered at a temperature of 1350 ° C for 6 hours to obtain a high-temperature heat-sensitive ceramic material. ;

[0033] 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 obtain a negative temperature...

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Abstract

The invention relates to a tungsten bronze type high-temperature thermistor material and a preparation method thereof, the tungsten bronze type high-temperature thermistor material is prepared from barium carbonate, samarium oxide and titanium dioxide by mixing, grinding, calcining, cold isostatic pressing, high-temperature sintering and electrode coating and burning, and the tungsten bronze type high-temperature thermistor material with the material constant of B400 DEG C / 850 DEG C = 15300K-16400K and the resistivity of 4.8 * 10 < 7 >-1.43 * 10 < 8 > omegacm at the temperature of 400 DEG C is obtained. The material has stable performance and high consistency, has obvious negative temperature coefficient characteristics at the temperature of 350-1100 DEG C, and is suitable for manufacturing high-temperature thermistors.

Description

technical field [0001] The invention relates to a tungsten bronze high-temperature thermistor material and a preparation method thereof. The thermistor material has good negative temperature coefficient characteristics in the temperature range of 350°C-1100°C, and is suitable for manufacturing high-temperature thermistors. new thermistor material. Background technique [0002] The rapid development of contemporary science and information technology is inseparable from the development and application of new materials. In terms of temperature detection, control and compensation, the negative temperature coefficient thermistor (NTCR) occupies an important position. Since the rapid development of electronic information technology, research on new NTC materials has always been a research direction of scientific researchers. NTCR is widely used in household appliances, medical equipment, aerospace, automobile manufacturing and many other fields. However, the spinel structure th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/622C04B41/88H01C7/04
CPCC04B35/50C04B35/622C04B41/88C04B41/5122H01C7/045C04B2235/3215C04B2235/3232C04B2235/6567C04B2235/662C04B41/4539C04B41/0072
Inventor 张博武锐锋常爱民林元伟
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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