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Method for preparing kilogram grade thermistor material

A thermistor, kilogram technology, applied in the field of preparing kilogram negative temperature coefficient thermal materials, can solve the problems of slow scale production of thermal materials and limited research, and achieve the effect of accurate stoichiometric ratio and small particle size

Inactive Publication Date: 2019-07-05
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

Researchers have done a lot of research work in the field of thermistors. However, the research on the synthesis of thermosensitive materials by hydrothermal method is still very limited, and the large-scale production of thermosensitive materials prepared by hydrothermal method is still slow.

Method used

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  • Method for preparing kilogram grade thermistor material
  • Method for preparing kilogram grade thermistor material
  • Method for preparing kilogram grade thermistor material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] a. According to the molar ratio of the element Co:Mn:Fe:Zn is 3:0.5:2.5:0, with 193.24g CoSO 4 ·7H 2 O, 19.46gMnSO 4 ·H 2 O and 160.07 g FeSO 4 ·7H 2 O is the raw material, respectively placed in beakers, according to the concentration ratio of the precipitant solution and the raw material solution is 3:1, add 760mL deionized water as the dispersion medium to form a raw material solution, then add 159.41g ammonium bicarbonate dissolved in 2240mL deionized The precipitant ammonium bicarbonate solution formed from water was continuously magnetically stirred at a temperature of 40° C. for 5 hours, and ammonia water was added to adjust the pH of the mixed solution to 7 to obtain a mixed solution;

[0015] b. Transfer the mixed solution obtained in step a into a 5L hydrothermal kettle with a filling degree of 60%, set the reaction temperature at 90°C, the reaction time for 12h, and the stirring speed at 300rpm. After the reaction is complete, cool down naturally. The sl...

Embodiment 2

[0018] According to the molar ratio of the element Co:Mn:Fe:Zn is 1:2.5:1.7:0.8, with 110.18g CoSO 4 ·7H 2 O, 166.46gMnSO 4 ·H 2 O, 186.18g FeSO 4 ·7H 2 O and 90.17g ZnSO 4 ·7H 2 O is the raw material, placed in beakers respectively, according to the concentration ratio of the precipitant solution and the raw material solution is 2:1, add 1300mL deionized water as the dispersion medium to form a raw material solution, then add 270.41g ammonium bicarbonate dissolved in 5700mL deionized The precipitant ammonium bicarbonate solution formed from water was continuously magnetically stirred at a temperature of 40° C. for 3 hours, and ammonia water was added to adjust the pH of the mixed solution to 8 to obtain a mixed solution;

[0019] b. Transfer the mixed solution obtained in step a into a 10L hydrothermal kettle with a filling degree of 70%, set the reaction temperature at 180°C, the reaction time for 6h, and the stirring speed at 100rpm. After the reaction is complete, co...

Embodiment 3

[0022] a. According to the molar ratio of the element Co:Mn:Fe:Zn 2:1.5:2.1:0.4, with 84.75g CoSO 4 ·7H 2 O, 38.41gMnSO 4 ·H 2 O, 88.46g FeSO 4 ·7H 2 O and 17.34 g ZnSO 4 ·7H 2 O is the raw material, placed in beakers respectively, according to the concentration ratio of the precipitant solution and the raw material solution is 4:1, add 500mL deionized water as the dispersion medium to form a raw material solution, then add 104.37g ammonium bicarbonate dissolved in 1100mL deionized The precipitant ammonium bicarbonate solution formed from water was continuously magnetically stirred at a temperature of 40° C. for 4 hours, and ammonia water was added to adjust the pH of the mixed solution to 9 to obtain a mixed solution;

[0023]b. Transfer the mixed solution obtained in step a into the lining of a 2L hydrothermal kettle with a filling degree of 80%, set the reaction temperature at 150°C, the reaction time for 9 hours, and the stirring speed at 150rpm. After the reaction i...

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Abstract

The invention relates to a method for preparing a kilogram grade thermistor material. In the method, automatic hydrothermal kettles having volumed of 2L, 5L or 10L, different in volume, are adopted asreaction vessels, and wet chemical synthesis is performed under different packing conditions including 60%, 70% or 80%. A material system adopts Co-Mn-O as matrix, electrical properties and stabilityare regulated through Fe and Zn doping, and influences of optimum reaction conditions including reaction temperature, reaction time, the stirring speed, the degree of packing and a sintering processon material performance are explored. The kilogram grade thermistor material prepared by the method has uniform grain size and high density, and electrical performance parameters are that: B<25 / 50> is3865-4403 K, Rho<25> is 9.8-26 k[Ohm].cm, and the resistance drift rate is 2.0%-0.2%. The method lays a good foundation for synthesis of heat-sensitive materials in the hydrothermal field and for theengineering application of thermistor elements.

Description

technical field [0001] The invention relates to the field of thermistor materials, in particular to a method for preparing kilogram-level negative temperature coefficient thermosensitive materials by using an automatic water heating kettle. Background technique [0002] The rapid development of information technology directly drives the market research of various precision sensors. As one of the important types of sensors, the application fields of temperature sensors are becoming more and more extensive. Among them, the negative temperature coefficient (NTC) thermistor has great research value due to its advantages of high sensitivity and good reliability. The electrical performance parameters (room temperature resistivity, thermal constant, etc.) of NTC thermistors required in different fields are generally different, sometimes quite different. In order to obtain resistance values ​​and sensitive materials with a wide range of material constants, a quaternary transition ...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622C04B35/645H01C7/04
CPCC04B35/2658C04B35/622C04B35/6455C04B2235/3275C04B2235/6567H01C7/043
Inventor 常爱民张敏李梅善张惠敏孙家林赵欣
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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