Method for preparing nano NTC (Negative Temperature Coefficient) thermal-sensitive material

A heat-sensitive material and nanotechnology, applied in the field of preparation of nano-NTC heat-sensitive materials, can solve the problems of complex preparation methods, inability to obtain dense nano-NTC heat-sensitive materials, expensive equipment, etc., to avoid particle growth and crystallization effect of grain coarsening, high material constant

Active Publication Date: 2018-05-15
NINGXIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, nanonized NTC thermosensitive materials mostly appear in thin film materials, and thin film preparation methods such as evaporation method, magnetron sputtering method, pulse laser method and organic pyrolysis method, etc., these methods will inevitably bring in vacancies or interstitial atoms, As a result, there is no significant difference between the resistivity and material constants and the corresponding bulk materials, and its preparation method is complicated and the equipment is expensive
However, the traditional solid-state sintering method cannot obtain dense nano-NTC thermosensitive materials.

Method used

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  • Method for preparing nano NTC (Negative Temperature Coefficient) thermal-sensitive material

Examples

Experimental program
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Effect test

Embodiment 1

[0024] S1 nano powder preparation: 46.48ml concentration is 50% Mn (NO 3 ) 3 solution and 20.36g of Ni(NO 3 ) 2 ·6H 2 After O mixing, add deionized water until completely dissolved, then add 67.50g of citric acid, stir until completely dissolved, then add 18.59ml of ethylene glycol, mix well to obtain a transparent solution; then adjust the pH value of the transparent solution to 3 with ammonia water, Then put the transparent solution in a 70°C water bath to stir and evaporate the solvent to obtain a wet gel, then transfer the wet gel to an oven at 120°C until it is completely dried to obtain a dry gel, then place the dry gel on In the muffle furnace, the temperature was raised to 500°C at a rate of 2°C / min and kept for 1 hour to obtain a calcined powder. Add 95% ethanol to the calcined powder and put it in a ball mill for 1 hour, then put it in an oven at 100°C until completely drying to obtain nickel-manganese spinel powder.

[0025] S2 Tabletting: The obtained nickel-m...

Embodiment 2

[0029] S1 nano powder preparation: 46.48ml concentration is 50% Mn (NO 3 ) 3 solution and 20.36g of Ni(NO 3 ) 2 ·6H 2 After O mixing, add deionized water until completely dissolved, then add 67.50g of citric acid, stir until completely dissolved, then add 18.59ml of ethylene glycol, mix well to obtain a transparent solution; then adjust the pH value of the transparent solution to 3 with ammonia water, Then put the transparent solution in a 70°C water bath to stir and evaporate the solvent to obtain a wet gel, then transfer the wet gel to an oven at 120°C until it is completely dried to obtain a dry gel, then place the dry gel on In the muffle furnace, the temperature was raised to 500°C at a rate of 2°C / min and kept for 1 hour to obtain a calcined powder. Add 95% ethanol to the calcined powder and put it in a ball mill for 1 hour, then put it in an oven at 100°C until completely drying to obtain nickel-manganese spinel powder.

[0030] S2 Tabletting: The obtained nickel-m...

Embodiment 3

[0033] S1 nano powder preparation: 46.48ml concentration is 50% Mn (NO 3 ) 3 solution and 20.36g of Ni(NO 3 ) 2 ·6H 2 After O mixing, add deionized water until completely dissolved, then add 67.50g of citric acid, stir until completely dissolved, then add 18.59ml of ethylene glycol, mix well to obtain a transparent solution; then adjust the pH value of the transparent solution to 3 with ammonia water, Then put the transparent solution in a 70°C water bath to stir and evaporate the solvent to obtain a wet gel, then transfer the wet gel to an oven at 120°C until it is completely dried to obtain a dry gel, then place the dry gel on In the muffle furnace, the temperature was raised to 500°C at a rate of 2°C / min and kept for 1h to obtain calcined powder. Add 95% ethanol to the calcined powder and put it in a ball mill for 1h, then put it in an oven at 100°C until completely drying to obtain nickel-manganese spinel powder.

[0034]S2 Tabletting: The obtained nickel-manganese sp...

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Abstract

The invention discloses a novel method for preparing a nano NTC (Negative Temperature Coefficient) thermal-sensitive material. The novel method comprises the following steps: firstly, preparing nickel-manganese spinel powder of which the particle size is 50nm by using a sol-gel method; treating nano powder by using modes of tabletting and isostatic pressing so as to obtain a raw blank; sintering the raw blank for 0-60 seconds in a super-fast sintering furnace at 1000-1040 DEG C; further sintering for 5-20 hours in an air furnace at 850-950 DEG C, thereby finally obtaining the thermal-sensitiveNTC material of which the particle size is smaller than 500nm. The thermal-sensitive material has relatively high resistance and material constants.

Description

technical field [0001] The invention relates to the technical field of preparation of negative temperature coefficient (NTC) thermosensitive materials, in particular to a preparation method of nanometer NTC thermosensitive materials. Background technique [0002] NTC thermal temperature sensor is widely used in temperature measurement, temperature alarm, temperature compensation, suppression of surge current and other fields. It is currently a temperature sensor with a wide range of applications, the highest sensitivity and low cost. Appropriate room temperature resistivity and high material constant are important development directions of NTC thermosensitive materials, and nanometerization is an effective method to improve material constant. [0003] At present, nanonized NTC thermosensitive materials mostly appear in thin film materials, and thin film preparation methods such as evaporation method, magnetron sputtering method, pulse laser method and organic pyrolysis metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/01C04B35/624
CPCC04B35/01C04B35/624C04B2235/602C04B2235/6562C04B2235/6567C04B2235/661
Inventor 梁森崔苗苗张笑袁羽李海波高忙忙
Owner NINGXIA UNIVERSITY
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