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Thermistor with low resistance value, high B value and negative temperature coefficient

A technology of negative temperature coefficient and thermistor, applied in the direction of resistors with negative temperature coefficient, etc., can solve the problems of large resistance value, use, data cannot be read, etc., to achieve the effect of good linearity and high sensitivity

Active Publication Date: 2012-09-19
JURONG BOYUAN ELECTRONICS
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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 high resistance value and high B value with existing formula and technology: that is, if the B value is 4500-4700K, the resistivity It can only be 500~3000(kΩ.mm); high resistance, high B, due to the large resistance value, it cannot be used in the low temperature section, because the resistance value is very large at low temperature, because the NTC characteristic is that the resistance value increases with temperature When used at low temperature, the data cannot be read due to the large resistance value, which cannot meet the requirements of special customers; and it is difficult to achieve the formula combination of low resistance value and high B value: low resistance value, high B value B value means that the B value can reach 4500 ~ 4700K, and the resistivity can reach 15 ~ 40 (kΩ.mm)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Embodiment 1: A kind of low resistance value high B value negative temperature coefficient thermistor, comprises the composition of following weight percent: Mn 2 o 3 46%, Co. 2 o 3 37%, CuO 5%, La 2 o 3 1%, MgO 2%, CaO 3%, ZrO 2 4%, SiO 2 3%.

[0010] The manufacturing method of the above-mentioned low resistance value high B value negative temperature coefficient thermistor, the method comprises the following steps:

[0011] 1) Preparation of ceramic slurry: First, mix the above-mentioned ingredients according to the weight percentage to form a powder, then add ethanol, binder, and dispersant to make a slurry, in which powder: ethanol: binder (CK24): dispersant (BYK110) weight ratio = 1:0.3:0.5:0.08; the adhesive uses CK24, which is a vinyl modified adhesive for electronic ceramics. The dispersant adopts the dispersant of model BYK110.

[0012] 2) Tape casting, put the prepared slurry in a vacuum box, use a catheter to absorb the slurry on the carrier fi...

Embodiment 2

[0027] Embodiment 2: basically identical with embodiment 1, difference is the composition of NTC thermistor and the proportioning of powder and ethanol, binding agent, dispersant, specifically as follows:

[0028] The weight percent of each composition is as follows: Mn 2 o 3 30%, Co. 2 o 3 40%, CuO 8%, La 2 o 3 5%, MgO 5%, CaO 5%, ZrO 2 5%, SiO 2 2%.

[0029] The weight ratio of powder: ethanol: binder: dispersant = 1:0.5:0.64:0.05.

[0030] After testing, the material constant B of the thermistor is 4500-4700K, and the resistivity ρ is 15-40 (kΩ.mm).

Embodiment 3

[0031] Embodiment 3: basically identical with embodiment 1, difference is the composition of NTC thermistor and the proportioning of powder and ethanol, binding agent, dispersant, specifically as follows:

[0032] The weight percent of each composition is as follows: Mn 2 o 3 50%, Co. 2 o 3 20%, CuO 7%, La 2 o 3 5%, MgO 5%, CaO 5%, ZrO 2 5%, SiO 2 3%.

[0033] The weight ratio of powder: ethanol: binder: dispersant = 1:0.4:0.7:0.1.

[0034] After testing, the material constant B of the thermistor is 4500-4700K, and the resistivity ρ is 15-40 (kΩ.mm).

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Abstract

The invention discloses a thermistor with a low resistance value, a high B value and a negative temperature coefficient, comprising the following components in percentage by weight: 30-50% of Mn2O3, 20-40% of Co2O3, 5-8% of CuO, 1-5% of La2O3, 1-5% of MgO, 1-5% of CaO, 1-5% of ZrO2 and 2-3% of SiO2. The thermistor has the advantages that (1) the thermistor is better in linearity and is conveniently applied to a temperature measurement industry; (2) the low resistance value and the high B value can be realized by using the formula, i.e., the resistivity rho can be up to 15-40 (kohm.mm) when a material constant B value is up to 4500-4700K; (3) the thermistor can be used within a wide low-temperature and high-temperature range; and (4) because of large material constant B value and high sensitivity, the thermistor can also be used by a special customer requiring low temperature, high temperature and a resistance value.

Description

technical field [0001] The invention relates to a thermistor, specifically a low-resistance, high-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 high resistance value and high B value with existing formula and technology: that is, if the B value is 4500-4700K, the resistivity It can only be 500~3000(kΩ.mm); high resistance, high B, due to the large resistance value, it cannot be used in the low temperature section, because the resistance value is very large at low temperature, because the NTC characteristic is that the resistance value increases with temperature When used at low temperature, the data cannot be read due to the large resistance value, which cannot meet the requirements of special customers; and it is difficult to achieve the formula combination of low resistance value and high B value: low ...

Claims

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Application Information

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IPC IPC(8): H01C7/04
Inventor 王梅凤
Owner JURONG BOYUAN ELECTRONICS
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