Negative temperature coefficient (NTC) thermosensitive resistor material

A technology of thermistor and material constant, applied in the direction of resistors with negative temperature coefficient, etc., can solve the problems of weak signal, unable to meet special customers, etc., achieve the effect of good linearity, convenient application, and avoid series resistance

Inactive Publication Date: 2012-09-19
JURONG BOYUAN ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The signal is weak when used at high temperature, wh

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: a kind of NTC thermistor material, comprises the composition of following percentage by weight: Mn 2 o 3 20%, Co. 2 o 3 20%, Ni 2 o 3 5%, MgO 50%, Al 2 o 3 5%.

[0015] The manufacturing method of the above-mentioned high resistance value low B value negative temperature system 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=1:0.3:0.5:0.05; adhesive CK24 is a commercially available product; CK24 is a vinyl modified adhesive for electronic ceramics; the dispersant is BYK110;

[0017] 2) Tape casting, put the prepared slurry in a vacuum box, use a catheter to absorb the slurry on the carrier film to obtain a film with a thickness of 20-70 μm, and then transfer it circularly and dry it in an oven at...

Embodiment 2

[0031] Embodiment 2: basically identical with embodiment 1, difference is the prescription of NTC thermistor material, specifically as follows: Mn 2 o 3 40%, Co. 2 o 3 15%, Ni 2 o 3 15%, MgO 28%, Al 2 o 3 2%.

[0032] Metal oxide: ethanol: binder: weight ratio of dispersant=1:0.5:0.7:0.1.

[0033] After testing, the resistivity ρ of the thermistor is 450-600 (kΩ.mm), and the material constant B is 3800K-3900K.

Embodiment 3

[0034] Embodiment 3: basically identical with embodiment 1, difference is the prescription of NTC thermistor material, specifically as follows: Mn 2 o 3 30%, Co. 2 o 3 18%, Ni 2 o 3 12%, MgO 32%, Al 2 o 3 8%.

[0035] Metal oxide: ethanol: binder: weight ratio of dispersant=1:0.4:0.6:0.06.

[0036] After testing, the resistivity ρ of the thermistor is 450-600 (kΩ.mm), and the material constant B is 3800K-3900K.

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Abstract

The invention discloses a negative temperature coefficient (NTC) thermosensitive resistor material which comprises, by weight, 20-40% of Mn2O3, 15-20% of Co2O3, 5-15% of Ni2O3, 20-50% of MgO and 2-8% of Al2O3. The ingredients of the NTC thermosensitive resistor material are mixed, and then ethanol, a binding agent and a dispersing agent are added into a mixture to prepare slurry. The slurry is sequentially subjected to casting molding, drying, separation, cutting, glue ejection and sintering to obtain a ceramic chip, and NTC thermosensitive resistors with 450-600 (kilohm.mm) of resistivity rho and 3800 K-3900 K of material constant B are obtained after electrode manufacture. The NTC thermosensitive resistor material has the advantages of being good in linearity, being conveniently applied to the temperature measuring industry, being capable of being manufactured into the high-resistance-value low-B-value thermosensitive resistors, being used simultaneously at high temperature and at low temperature, and capable of meeting the using requirements of special customers so as to avoid the situation that the resistors are required to be connected in series when a high temperature section has a small resistance value and a weak signal.

Description

technical field [0001] The invention relates to a thermistor, specifically an NTC thermistor material and a method for manufacturing an NTC thermistor using the material. 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: if the B value reaches 3800K~3900K, the resistivity is only It can achieve 50~100(kΩ.mm); and it is difficult to realize the formula combination of high resistance value and low B value. High resistance value and low B value mean that the B value can reach 3800K~3900K, and the resistivity can be achieved 450~600(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 val...

Claims

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Application Information

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IPC IPC(8): H01C7/04C04B35/01
Inventor 王梅凤
Owner JURONG BOYUAN ELECTRONICS
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