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NTC (negative temperature coefficient) thermistor chip, resistor and manufacturing method thereof

A thermistor chip, negative temperature coefficient technology, applied in resistors with negative temperature coefficient, resistance manufacturing, resistors and other directions, can solve the problems of easy melting of tin layer, circuit failure, thermistor falling off, etc. The effect of good resistance value consistency, high B value and high stability

Inactive Publication Date: 2015-06-24
SHENZHEN SUNLORD ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, the designed operating temperature range of existing chip negative temperature coefficient thermistors is -40°C~125°C. more than 10%
Secondly, at this temperature, the tin layer of the terminal electrode of this existing negative temperature coefficient thermistor is easy to melt, causing the thermistor to fall off and lose its function in the circuit

Method used

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  • NTC (negative temperature coefficient) thermistor chip, resistor and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] MnO 2 、Ni 2 o 3 、Al 2 o 3 , Y 2 o 3 The powder is mixed according to the ratio (mole percentage) 50%: 35%: 11%: 4% to form transition metal oxide powder, which is sintered to form a negative temperature coefficient thermistor chip. The time at the sintering temperature is between 3 and 9 hours. In this example, MnO 2 、Ni 2 o 3 、Al 2 o 3 , Y 2 o 3 The molar percentage of the powder can also be: 89%: 5%: 5%: 1%, or 70%: 20%: 5%: 5%, or 55%: 30%: 13%: 2%.

Embodiment 2

[0020] MnO 2 、Co 3 o 4 、Ni 2 o 3 、Al 2 o 3 , Y 2 o 3 The powder is mixed according to the ratio (mole percentage) 60%: 15%: 15%: 15%: 5% to form transition metal oxide powder, which is sintered to form a negative temperature coefficient thermistor chip. The specific maximum sintering temperature is 1200 to 1270 °C , the time to maintain the highest sintering temperature is between 3 and 9 hours. MnO 2 、Co 3 o 4 、Ni 2 o 3 、Al 2 o 3 , Y 2 o 3 The molar percentage can also be: 50%: 10%: 25%: 11%: 4%, or 69%: 10%: 15%: 5%: 1%, or 55%: 20%: 16%: 6% : 3%.

Embodiment 3

[0022] (1) MnO 2 、Ni 2 o 3 、Al 2 o 3 , Y 2 o 3 The powder is mixed according to the ratio (mole percentage) 60%: 20%: 15%: 5% to form transition metal oxide powder, and then add a certain proportion of organic solvent and binder to prepare a slurry suitable for casting. The organic solvent can be a mixture of propyl acetate and ethanol in a ratio of 1:2 (mass percentage), and the adhesive can be polyvinyl butyral (PVB), transition metal oxide powder, organic solvent and adhesive. The ratio (mass percentage) is: 1:1.2:0.2.

[0023] (2) Prepare a 30um thick raw film sheet by casting the prepared powder slurry, and then press 20 layers of raw film sheets together to make a green sheet with a thickness of about 0.5mm, and finally place the green sheet The slices are cut into semi-finished products with a size of 1.6X0.8X0.5mm.

[0024] (3) Place the cut semi-finished product in an alumina sagger at a high temperature of 300°C for debinding (that is, organic solvents and a...

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Abstract

The invention discloses an NTC (negative temperature coefficient) thermistor chip, as well as a resistor and a manufacturing method thereof. The NTC thermistor chip is made of transition metal oxide powder through sintering, and the transition metal oxide powder contains the following components in percentage by molar: 5-15% Al2O3, 0-5% Y2O3, 50-90% MnO2, 5-35% Ni2O3 or Co3O4, wherein the content of Y2O3 is not zero. The invention has the benefits as follows: the NTC thermistor has good resistance consistency and higher B value at 25 DEG C, and after the NTC thermistor is placed at a high temperature for a period, the resistance drift is smaller than 1% below 25 DEG C, so that the stability is very high.

Description

technical field [0001] The invention relates to a thermistor, in particular to a negative temperature coefficient thermistor chip, its resistance and a manufacturing method thereof. Background technique [0002] In recent years, electronic components have been required to adapt to surface mounting, and NTC thermistors with negative temperature characteristics have also been developed into chips. The operating temperature range of the existing chip negative temperature coefficient thermistor is mainly between -40°C and 125°C, and the surface of the terminal electrode is plated with a tin layer, so that it can be soldered in the circuit by reflow soldering during the process of soldering the circuit. With the development of technology, some negative temperature coefficient thermistors used in higher temperature occasions also have a demand for chip type. For example, the temperature control of the laser printer head requires a chip type that can be used stably in the temperatu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/04H01C17/065
Inventor 潘士宾包汉青刘传东严友兰程健康建宏
Owner SHENZHEN SUNLORD ELECTRONICS
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