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Ternary-system chip negative temperature coefficient thermal resistor

A technology of negative temperature coefficient and thermistor, which is applied to resistors with negative temperature coefficient, etc., can solve the problems of accurate stoichiometric ratio of difficult materials, high calcination temperature of precursors, uneven powder particle size, etc. Low, long-term stability, and the effect of improving reactivity

Inactive Publication Date: 2010-06-02
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, at present, large quantities of NTC thermistor materials are usually prepared by high-temperature solid-phase method. The raw materials are metal oxides, the calcination temperature of the precursor is high, the powder particle size is uneven, and the powder activity is low. In addition, in the grinding process It is difficult to ensure the accurate stoichiometric ratio of materials in the process, and it is difficult to guarantee that impurities will not be introduced. Therefore, the use of this method to manufacture high-precision NTC thermistor powder has certain limitations.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] a. Take 3mol of analytically pure manganese nitrate, nickel nitrate, and cobalt nitrate as raw materials in molar percentage: Mn:Ni:Co=30:15:55, mix and dissolve in deionized water, and prepare 1.0mol / L ion mixture solution, control the molar concentration of metal ions to be 1mol / L;

[0028] b. Dissolve 4.5mol analytically pure ammonium bicarbonate in deionized water, fully stir and dissolve, and prepare 1.25mol / L ammonium bicarbonate precipitant solution, and control the molar concentration to be 1.25mol / L;

[0029] c. Slowly add the ammonium bicarbonate precipitant solution dropwise to the mixed solution in step a, stir evenly, control the heating temperature at 30°C, test the change of pH value with an acidity meter under vigorous stirring, and adjust the pH value to 7.8 with ammonia water, the reaction process stirring continuously;

[0030] d. Leave the reacted precipitation solution for 24 hours, wash it with deionized water for 5 times, then wash it with absolu...

Embodiment 2

[0037] a. With 3mol of analytical purity, the molar percentage is: Mn:Ni:Co=50:13:37 manganese nitrate, nickel nitrate, cobalt nitrate raw materials, mix and dissolve in deionized water, and prepare 1.0mol / L ion mixture solution, control the molar concentration of metal ions to be 1mol / L;

[0038] b. Dissolve 4.5mol analytically pure ammonium bicarbonate in deionized water, fully stir and dissolve, and prepare 1.25mol / L ammonium bicarbonate precipitant solution, and control the molar concentration to be 1.25mol / L;

[0039] c. Slowly add the ammonium bicarbonate precipitant solution dropwise to the mixed solution in step a, stir evenly, control the heating temperature at 40°C, test the change of pH value with an acidity meter under vigorous stirring, and adjust the pH value at 8.3 with ammonia water, and react Stir continuously during the process;

[0040] d. Leave the reacted precipitation solution for 24 hours, wash it with deionized water for 5 times, then wash it with abso...

Embodiment 3

[0047] a. With 3mol of analytical purity, the molar percentage is: Mn:Ni:Co=70:1:29 manganese nitrate, nickel nitrate, cobalt nitrate raw materials, mix and dissolve in deionized water, and prepare 1.0mol / L ion mixture solution, control the molar concentration of metal ions to be 1mol / L;

[0048] b. Dissolve 4.5mol analytically pure ammonium bicarbonate in deionized water, fully stir and dissolve, and prepare 1.25mol / L ammonium bicarbonate precipitant solution, and control the molar concentration to be 1.25mol / L;

[0049] c. Slowly add the ammonium bicarbonate precipitant solution dropwise to the mixed solution in step a, stir evenly, control the heating temperature at 50°C, test the change of pH value with an acidity meter under vigorous stirring, and adjust the pH value at 9 with ammonia water, and react Stir continuously during the process;

[0050] d. Leave the reacted precipitation solution for 24 hours, wash it with deionized water for 5 times, then wash it with absolut...

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Abstract

The invention relates to a ternary-system chip negative temperature coefficient thermal resistor, which uses manganese nitrate, nickel nitrate and cobalt nitrate as raw materials and ammonium bicarbonate as precipitator, is prepared by a liquid-phase co-precipitation method, and comprises the following steps: improving the agglomeration phenomenon of the precipitated particles by controlling the molar ratio of nitrate to precipitator ammonium bicarbonate, the reaction temperature and the pH value, washing out the impurities in the product by modes of water washing and alcohol washing to obtain superfine and uniform thermal resistor powder, drying, calcining to obtain evenly dispersed mixed oxide powder of Mn, Ni and Co, briquetting and moulding the powder, isopressing, sintering under high temperature, slicing by a semiconductor to obtain a thermal resistor chip, and encapsulating with epoxy resin to obtain the ternary-system chip negative temperature coefficient thermal resistor with high performance which has the characteristics of good uniformity, high stability, capability of repeatability and interconversion, and is suitable for temperature measurement, control and line compensation in the household appliance field such as refrigerators, air conditioners and the like.

Description

technical field [0001] The invention relates to a ternary system chip-type negative temperature coefficient thermistor prepared by a liquid phase co-precipitation method. Background technique [0002] Negative temperature coefficient (NTC) thermistor has the characteristics of high sensitivity and miniature. It is in great demand in many home appliances and information industries. With the rapid development of electronic information technology and digitalization, miniaturization, To meet the requirements of lightweight and thin, high-precision and interchangeable NTC thermistor elements have become the mainstream direction of development. However, at present, large quantities of NTC thermistor materials are usually prepared by high-temperature solid-phase method. The raw materials are metal oxides, the calcination temperature of the precursor is high, the powder particle size is uneven, and the powder activity is low. In addition, in the grinding process It is difficult to ...

Claims

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Application Information

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IPC IPC(8): H01C7/04C04B35/01C04B35/622
Inventor 张惠敏常爱民王伟马继才
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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