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Method for preparing NTC-type thermistor ceramic material

A technology of ceramic materials and thermistors, which is applied in the field of preparation of NTC thermistor ceramic materials, can solve the problems affecting the electrical properties of the NTC thermistor ceramic materials, and achieves the improvement of electrical properties, process stability and speed. Effect

Inactive Publication Date: 2017-09-01
蚌埠市嘉实机电设备制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the gel powder prepared by the traditional sol-gel method has many impurities such as metal oxides, which seriously affects the electrical properties of the NTC-type thermistor ceramic material, there is an urgent need for a more scientific and reasonable NTC-type thermistor. Preparation method of varistor ceramic material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A preparation method of an NTC type thermistor ceramic material, comprising the following steps:

[0017] (1) After mixing manganese nitrate solution with a mass fraction of 50% and nickel nitrate hexahydrate at a liquid-solid ratio of 7ml:3g, continue to add deionized water equal to the volume of manganese nitrate solution and nickel nitrate hexahydrate Equal weight of copper nitrate, after stirring evenly, continue to add sodium methacrylate, ethylene thiourea, and neutral ionic surfactant to it, after stirring evenly, heat the mixture to 80°C, and then add it to the pressure tank , the pressure of the pressure tank is raised to 5bar, and the stirring is continued for 20min;

[0018] (2) Release the pressure of the pressure tank, dry the prepared product to a water content of 7%, and then transfer it to a muffle furnace for calcination at 800°C for 4 hours to obtain a uniform dry gel powder;

[0019] (3) Use a press to dry-press the prepared dry gel powder into a dis...

Embodiment 2

[0024] A preparation method of an NTC type thermistor ceramic material, comprising the following steps:

[0025] (1) After mixing manganese nitrate solution with a mass fraction of 50% and nickel nitrate hexahydrate at a liquid-solid ratio of 7ml:3g, continue to add deionized water equal to the volume of manganese nitrate solution and nickel nitrate hexahydrate Equal weight of copper nitrate, after stirring evenly, continue to add sodium methacrylate, ethylene thiourea, and neutral ionic surfactant to it, after stirring evenly, heat the mixture to 85°C, and then add it to the pressure tank , the pressure of the pressure tank is raised to 6bar, and the stirring is continued for 25min;

[0026] (2) Release the pressure of the pressure tank, dry the prepared product to a water content of 8%, and then transfer it to a muffle furnace and calcine at 850°C for 4.5 hours to obtain a uniform dry gel powder;

[0027] (3) Use a press to dry-press the prepared dry gel powder into a disc ...

Embodiment 3

[0032] A preparation method of an NTC type thermistor ceramic material, comprising the following steps:

[0033] (1) After mixing manganese nitrate solution with a mass fraction of 50% and nickel nitrate hexahydrate according to the liquid-solid ratio of 7ml:3g, continue to add deionized water equal to the volume of manganese nitrate solution and nickel nitrate hexahydrate Equal weight of copper nitrate, after stirring evenly, continue to add sodium methacrylate, ethylene thiourea, and neutral ionic surfactant to it, after stirring evenly, heat the mixture to 90°C, and then add it to the pressure tank , the pressure of the pressure tank is raised to 7bar, and the stirring is continued for 30min;

[0034] (2) Release the pressure of the pressure tank, dry the prepared product to a water content of 10%, and then transfer it to a muffle furnace for calcination at 900°C for 5 hours to obtain a uniform dry gel powder;

[0035] (3) Use a press to dry-press the prepared dry gel powd...

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Abstract

The invention discloses a method for preparing an NTC-type thermistor ceramic material. The method comprises the following operation steps: (1) mixing a manganese nitrate solution with nickel nitrate hexahydrate, continually adding deionized water and cupric nitrate into the mixed solution, performing uniform stirring, then adding sodium methallyl sulfonate, ethylene thiourea and a neutral ionic surfactant, performing uniform stirring, adding the obtained mixture into a pressure tank, raising the pressure of the pressure tank to 5-7 bar, and continually performing stirring; (2) releasing the pressure of the pressure tank, drying the prepared product, and transferring the prepared product into a muffle furnace for forging; and (3) performing sintering and polarization treatment on prepared gel dry powder to prepare the Mn2.25Ni0.5Cu0.125O4 thermistor ceramic material. The method is simple and is stable in process, the prepared gel powder almost contains no impurities and is small in grain size, and uniform in distribution, the NTC-type thermistor ceramic material is high in material coefficient B value and low in specific resistance, and the quality of the NTC-type thermistor ceramic material is effectively improved.

Description

technical field [0001] The invention belongs to the field of thermistor ceramic materials, and in particular relates to a preparation method of an NTC type thermistor ceramic material. Background technique [0002] NTC thermistor refers to a thermistor phenomenon and material that decreases exponentially with temperature rise and has a negative temperature coefficient. The material is a semiconductor ceramic made by fully mixing, molding, and sintering two or more metal oxides such as manganese, copper, silicon, cobalt, iron, nickel, and zinc. It can be made into a material with a negative temperature coefficient. (NTC) thermistor. Its resistivity and material constants vary with material composition ratio, sintering atmosphere, sintering temperature and structural state. Since the gel powder prepared by the traditional sol-gel method has many impurities such as metal oxides, which seriously affects the electrical properties of the NTC-type thermistor ceramic material, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/45C04B35/632C04B35/634C04B35/624H01C7/04
CPCC04B35/45C04B35/624C04B35/632C04B35/63488C04B2235/3262C04B2235/3279H01C7/043
Inventor 赵大鹏
Owner 蚌埠市嘉实机电设备制造有限公司