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Preparation method of ternary thermistor material with negative temperature coefficient

A technology of negative temperature coefficient and thermistor, which is applied to resistors with negative temperature coefficient, resistors, non-adjustable metal resistors, etc., can solve the problems of rarely reported use, achieve good stability and suppress surges effect of current

Inactive Publication Date: 2017-01-04
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

Generally, the material composition systems used in industry include binary system materials Ni-Mn-O system, Cu-Mn-O system, etc., and ternary system heat-sensitive ceramic materials mainly include Mn-Ni-Co-O system, Mn-Ni- Cu-O system, Mn-Ni-Fe-O system, Mn-Ni-Zn-O system, etc., all belong to Mn-Ni-based thermistor materials, but the use of Co-Mn-based materials is rarely reported.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] a. Weigh Co by molar ratio of 0.8:1.3:0.9 2 o 3 , MnO 2 , Fe 2 o 3 Mix the three oxide powders evenly, then mix the agate ball, the weighed oxide powder, deionized water and absolute ethanol at a mass ratio of 4:1:1:1, and put them into a planetary ball mill for high-energy Ball mill for 8 hours, then dry the ball milled powder at 100°C for 6 hours, grind and sieve 200 mesh into powder;

[0013] b. Calcinate the powder sieved in step a at a temperature of 1000°C for 1 hour, press into tablets, cold isostatically press at 400MPa for 1 minute, sinter at a temperature of 1300°C for 1 hour, coat the electrodes, and spot-weld the leads to obtain the performance parameters as the standard The resistance (25°C resistance) is 1002Ω, the material constant is 3671K, and the average resistance drift rate is 0.18% after aging at 150°C for 500 hours.

Embodiment 2

[0015] a. Weigh Co at a molar ratio of 2.0:0.8:0.2 2 o 3 , MnO 2 , Fe 2 o 3 Mix the three oxide powders evenly, then mix the agate ball, the weighed oxide powder, deionized water and absolute ethanol at a mass ratio of 4:1:1:1, and put them into a planetary ball mill for high-energy Ball mill for 24 hours, then dry the ball milled powder at a temperature of 50°C for 12 hours, grind and sieve 250 mesh into powder;

[0016] b. Calcinate the powder sieved in step a at a temperature of 700°C for 4 hours, press into tablets, cold isostatically press at 100MPa for 5 minutes, sinter at a temperature of 1100°C for 4 hours, coat the electrodes, and spot-weld the leads to obtain the performance parameters as the standard The resistance (25°C resistance) is 1797Ω, the material constant is 3994K, and the average resistance drift rate is 0.19% after aging at 150°C for 500 hours.

Embodiment 3

[0018] a. Weigh Co at a molar ratio of 1.4:1.05:0.55 2 o 3 , MnO 2 , Fe 2 o 3 Mix the three oxide powders evenly, then mix the agate ball, the weighed oxide powder, deionized water and absolute ethanol at a mass ratio of 4:1:1:1, and put them into a planetary ball mill for high-energy Ball mill for 12 hours, then dry the ball milled powder at 80°C for 8 hours, grind and sieve 300 mesh into powder;

[0019] b. Calcinate the powder sieved in step a at a temperature of 900°C for 3 hours, press into tablets, cold isostatically press at 300MPa for 3 minutes, sinter at a temperature of 1200°C for 3 hours, coat the electrodes, and spot-weld the leads to obtain the performance parameters as the standard The resistance (25°C resistance) is 1453Ω, the material constant is 3721K, and the average resistance drift rate is 0.16% after aging at 150°C for 500h. It is a high-stability ternary system negative temperature coefficient thermistor material.

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Abstract

The invention relates to a preparation method of a ternary thermistor material with a negative temperature coefficient. According to the method, the ternary thermistor material with the negative temperature coefficient and the high stability is prepared from oxides of three metal elements including Co, Mn and Fe through the processes of wet ball-milling preparing, presintering, forming, sintering and the like. The ternary thermistor material which has the negative temperature coefficient and is obtained through the method has the performance parameters that the standard resistance (25-DEG C resistance) is 1,002-1,797 ohm, the material constant is 3,671 k to 3,994 K, and after the material is aged for 500 h at 150 DEG C, the resistance drift rate is 0.16%-0.19%. The ternary thermistor material has the good stability, consistency and interchangeability and can be widely applied to occasions such as temperature measurement, temperature compensation and surge current inhibition.

Description

technical field [0001] The invention relates to a preparation method of electronic components, in particular to a preparation method of a high-stability ternary system negative temperature coefficient thermistor material. [0002] Background technique: [0003] Negative temperature coefficient (NTC) thermistors are widely used in various industrial and household fields to suppress inrush current, perform temperature measurement and temperature control, and compensate other circuits, and because of their high sensitivity, high stability, low Features such as cost are widely used. In recent years, due to the needs of home appliance industries such as air conditioners, refrigerators, and microwave ovens, the market's requirements for the stability and accuracy of NTC thermistors have increased day by day. [0004] In actual use, the resistance value of the NTC thermistor will drift to a certain extent due to the influence of the external environment, deviating from the initial ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/32C04B35/36C04B35/622H01C7/04
CPCC04B35/265C04B35/622H01C7/043
Inventor 姚金城刘旭
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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