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Negative temperature coefficient (NTC) thermosensitive resistor and preparation method therefor

A thermistor, negative temperature coefficient technology, applied in the direction of resistors with negative temperature coefficient, resistors, non-adjustable metal resistors, etc.

Inactive Publication Date: 2017-02-22
陆川县华鑫电子厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is less research on NTC thermistor materials with low resistivity and low B value, and there is no NTC thermistor material with low resistivity and low B value that meets practical applications.

Method used

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Examples

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Embodiment 1

[0020] A negative temperature coefficient NTC thermistor, the raw materials are composed according to the following ratio:

[0021] 48 parts of manganese dioxide, 20 parts of carbon trioxide, 19 parts of nickel oxide, 6 parts of copper oxide, 2 parts of ferric oxide, 1 part of cobalt trioxide, 90 parts of absolute ethanol, 120 parts of zirconia balls, Silicon oxide 8 parts.

[0022] The preparation method of described a kind of negative temperature coefficient NTC thermistor, comprises the steps:

[0023] (1) Mix manganese dioxide, carbon dioxide, nickel oxide, copper oxide, ferric oxide, cobalt oxide, absolute ethanol, zirconia balls, and silicon dioxide and perform ball milling. 280r / min, ball milling time 6.5 hours;

[0024] (2) drying the mixture obtained in step (1) and then heating it to 750° C., and keeping it warm for 3 hours to obtain a powder;

[0025] (3) The powder obtained in step (2) is ball milled for the second time, the ball milling speed is 280r / min, and t...

Embodiment 2

[0028] A negative temperature coefficient NTC thermistor, the raw materials are composed according to the following ratio:

[0029] 52 parts of manganese dioxide, 25 parts of carbon trioxide, 22 parts of nickel oxide, 8 parts of copper oxide, 3 parts of ferric oxide, 3 parts of cobalt trioxide, 160 parts of absolute ethanol, 450 parts of zirconia balls, Silicon oxide 16 parts.

[0030] The preparation method of described a kind of negative temperature coefficient NTC thermistor, comprises the steps:

[0031] (1) Mix manganese dioxide, carbon dioxide, nickel oxide, copper oxide, ferric oxide, cobalt oxide, absolute ethanol, zirconia balls, and silicon dioxide and perform ball milling. 300r / min, ball milling time 6.5 hours;

[0032] (2) drying the mixture obtained in step (1) and then heating it to 900° C., and keeping it warm for 13 hours to obtain a powder;

[0033] (3) The powder obtained in step (2) is subjected to ball milling for the second time, the ball milling speed ...

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PUM

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Abstract

The invention provides a negative temperature coefficient (NTC) thermosensitive resistor. The NTC thermosensitive resistor comprises the following raw materials based on parts: 48-52 parts of manganese dioxide, 20-25 parts of carbon trioxide, 19-22 parts of nickel oxide, 6-8 parts of copper oxide, 2-3 parts of iron trioxide, 1-3 parts of cobalt sesquioxide, 90-160 parts of absolute ethyl alcohol, 120-450 parts of zirconium oxide spheres, and 8-16 parts of silicon dioxide. The NTC thermosensitive resistor provided by the invention, through optimization, combination and determination of selection of basic components, dosage, ball-milling dielectric spheres and technological method, the following technical index requirement having extremely high parameter requirement and relatively high product precision requirement are finally achieved: the resistance is 0.291-0.309K<omega> at a temperature of 140 DEG C; the room temperature resistance is 7.9-8.9K<omega>; a material constant B (25 / 140) is 3,536-3,600K; and the temperature detection range is improved to be 140 DEG C, so that the NTC thermosensitive resistor is suitable for being used as a temperature sensing transmitter in an electric motor overtemperature protection apparatus.

Description

technical field [0001] The invention belongs to the technical field of thermistor materials, in particular to a negative temperature coefficient NTC thermistor and a preparation method thereof. Background technique [0002] Negative Temperature Coefficient (NTC) thermistor materials are usually solid solution materials composed of transition metal oxides, which have the functions of temperature measurement, temperature control, temperature compensation, and surge suppression. They are currently widely used in daily life and industrial production. The thermal constant of commonly used NTC thermistor materials, that is, the B value, is generally B25 / 85, and its value is generally 2000-6000K, and the resistivity is generally 3-75Ω·cm. [0003] NTC thermistor materials with low resistivity and low B value can be used in low temperature, high frequency, high power and large temperature attenuation compensation due to their low B value and resistivity. They are used in automotive ...

Claims

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Application Information

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IPC IPC(8): H01C7/04C01G45/02C01G49/06C01G51/04C01G25/02
CPCH01C7/043C01G25/02C01G45/02C01G49/06C01G51/04H01C7/046
Inventor 邱广茂
Owner 陆川县华鑫电子厂
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