Negative temperature coefficient thermistor

A negative temperature coefficient, thermistor technology, applied in the direction of resistors with negative temperature coefficient, can solve the problems of small resistance, simultaneous use, difficult to achieve high resistance formula combination, etc., to achieve good linearity and convenient application Effect

Inactive Publication Date: 2012-09-26
佛山市顺德区晶铭电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, NTC (abbreviation of Negative Temperature Coefficient, meaning negative temperature coefficient) thermistor can only achieve low resistance and low B value with existing formula and technology, that is, if the B value is 2800K~2900K, the resistivity It can only achieve 0.05~0.2(kΩ.mm); and it is difficult to achieve the formula combination of high resistance value and low B value. ~20(kΩ.mm); low resistance and low B, because the resistance value is small, it cannot be used in low and high temperature sections at the same time, because the resistance value is very small at high temperature, because the NTC characteristic is that the resistance value becomes smaller with the increase of temperature, and vice versa then become larger
The signal is weak when used at high temperature, which cannot meet the requirements of special customers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: a high resistance value low B value negative temperature coefficient thermistor, mainly made of metal oxide and solvent mixture, the metal oxide includes the following components by weight: Mn 2 o 3 20%, Ni 2 o 3 50%, Fe 2 o 3 10%, CuO 15%, Al 2 o 3 1.5%, MgO 3.5%.

[0015] The manufacturing method of the above-mentioned high resistance value low B value negative temperature coefficient thermistor, the method comprises the following steps:

[0016] 1) Preparation of ceramic slurry: Mix the components of the above metal oxides according to weight percentage, then add ethanol, binder CK24, and dispersant to make a slurry, in which metal oxide: ethanol: binder: dispersant Weight ratio = 1: 0.35: 0.57: 0.06; the adhesive CK24 is a commercially available product; CK24 is a vinyl modified adhesive for electronic ceramics; the dispersant is BYK110 dispersant.

[0017] 2) Tape casting, put the prepared slurry in a vacuum box, use a catheter to absorb t...

Embodiment 2

[0032] Embodiment 2: basically the same as Embodiment 1, the difference is the composition of the metal oxide, the proportioning ratio of the metal oxide and the solvent, specifically as follows: the metal oxide includes the following components by weight percentage: Mn 2 o 3 10%, Ni 2 o 3 65%, Fe 2 o 3 10%, CuO 10%, Al 2 o 3 0.5%, MgO 4.5%.

[0033] Metal oxide: ethanol: binder: weight ratio of dispersant=1:0.3:0.5:0.05.

[0034] After testing, the material constant B of the thermistor is 2800-2900K, and the resistivity ρ is 10-20 (kΩ.mm).

Embodiment 3

[0035] Embodiment 3: basically identical with embodiment 1, difference is the composition of metal oxide and metal oxide and

[0036] The proportioning of solvent is specifically as follows: Metal oxide comprises the composition of following weight percent: Mn 2 o 3 30%, Ni 2 o 3 40%, Fe 2 o 3 15%, CuO 12%, Al 2 o 3 2%, MgO 1%.

[0037] Metal oxide: ethanol: binder: weight ratio of dispersant=1:0.4:0.5:0.07.

[0038] After testing, the material constant B of the thermistor is 2800-2900K, and the resistivity ρ is 10-20 (kΩ.mm).

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Abstract

The invention discloses a negative temperature coefficient thermistor and a manufacturing method thereof. The thermistor is manufactured by mainly mixing a metal oxide and a solvent, wherein the metal oxide comprises the following components in percentage by weight: 10 to 30 percent of Mn2O3, 40 to 65 percent of Ni2O3, 10 to 25 percent of Fe2O3, 10 to 30 percent of CuO, 0.5 to 2.5 percent of Al2O3 and 1 to 5 percent of MgO. The negative temperature coefficient thermistor and the manufacturing method thereof have the advantages that the negative temperature coefficient thermistor has high linearity, and can be conveniently applied to the temperature measurement industry; due to the adoption of the formula of the metal oxide, the combination of high resistivity and a low B value can be obtained, namely a material constant B is 2,800 to 2,900K when resistivity rho is 10 to 20 (kOhm.mm); the negative temperature coefficient thermistor can be used for a wide temperature range, namely the negative temperature coefficient thermistor can be used at high temperature and low temperature; and the negative temperature coefficient thermistor can be used for a special customer, and the series-connection of a resistor is avoided when the resistivity is low and a signal is weak in a high-temperature section.

Description

technical field [0001] The invention relates to a thermistor, specifically a high-resistance and low-B-value negative temperature coefficient thermistor. Background technique [0002] At present, NTC (abbreviation of Negative Temperature Coefficient, meaning negative temperature coefficient) thermistor can only achieve low resistance and low B value with existing formula and technology, that is, if the B value is 2800K~2900K, the resistivity It can only achieve 0.05~0.2(kΩ.mm); and it is difficult to achieve the formula combination of high resistance value and low B value. ~20(kΩ.mm); low resistance and low B, because the resistance value is small, it cannot be used in low and high temperature sections at the same time, because the resistance value is very small at high temperature, because the NTC characteristic is that the resistance value becomes smaller with the increase of temperature, and vice versa becomes larger. The signal is weak when used at high temperature, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/04
Inventor 王梅凤
Owner 佛山市顺德区晶铭电子有限公司
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