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Method for manufacturing chip-type linear positive temperature coefficient thermistor

A positive temperature coefficient, thermistor technology, applied in the direction of resistors with positive temperature coefficient, etc., can solve the problems of narrow linear area and no need for temperature detection, and achieve the effect of low heat capacity, light weight and excellent self-recovery performance

Active Publication Date: 2013-04-17
CHINA ZHENHUA GRP YUNKE ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the temperature resistance characteristics of common PTC positive temperature thermistors are abrupt, and the linear region is very narrow. It is usually used for overcurrent protection of circuits, not for temperature detection, and temperature compensation circuits.

Method used

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Embodiment Construction

[0023] The present invention will be further described in detail below in conjunction with specific embodiments.

[0024] The manufacturing method of the chip-type linear positive temperature coefficient thermistor includes making front and back electrodes, making resistors, encapsulation, laser resistance adjustment, splitting, sintering, end coating, and electroplating. The specific manufacturing methods are as follows,

[0025] 1) Select a standard ceramic substrate, polish the ceramic substrate, control its surface roughness at 0.08-0.1 microns, and clean the polished ceramic substrate, preferably with deionized water to remove impurities on the ceramic substrate , and then dried for use, the pre-treatment of the ceramic substrate is conducive to the quality of the printing process in the later stage;

[0026] 2) Print surface electrodes on the surface of the ceramic substrate according to the conventional thick film resistor process to ensure that the printed thickness re...

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Abstract

The invention particularly discloses a method for manufacturing a linear positive temperature coefficient thermistor. The method comprises the following steps: manufacturing a surface electrode and a back electrode, manufacturing a resistor, packaging, trimming the resistor by using laser, slivering, sintering, coating an end electrode and electroplating, particularly selecting a substrate and polishing and cleaning the substrate, printing the surface electrode and the back electrode, sintering the surface back electrode and the back electrode, printing secondary glass, performing magnetron sputtering on a target material to form the resistor, performing heat treatment, removing a barrier layer to expose the resistor, trimming the resistor by using the laser, printing and packaging, solidifying a packaging layer, slivering primarily, coating the end electrode, sintering the end electrode, slivering secondarily, and electroplating nickel and tin-lead alloy. The manufactured chip-type linear positive temperature coefficient thermistor is small in size, light in weight, low in manufacturing cost and high in stability and quality reliability.

Description

technical field [0001] The invention belongs to the technical field of resistance manufacturing, and in particular relates to a method for manufacturing a chip-type linear positive temperature coefficient thermistor. Background technique [0002] PTC thermistors can be used for temperature measurement and control in industry. Linear positive temperature coefficient thermistor (Linear Positive Temperatrue Coefficient, referred to as LPTC), the resistance of LPTC thermistor increases with the increase of temperature, and changes in a straight line. Compared with the thermistor synthesized by PTC polymer ceramics, Good linearity, no need to take linear compensation measures to simplify circuit design. Regarding the temperature coefficient, the temperature coefficient refers to the high and low change rate of the linear thermistor with the rise and fall of the temperature. Example: For a thermistor at room temperature (25 degrees) 1K-3000ppm, the resistance value changes by 0....

Claims

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Application Information

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IPC IPC(8): H01C7/02
Inventor 陈传庆龚漫莉王成周瑞山韩玉成谢强殷志茹叶萍罗向阳
Owner CHINA ZHENHUA GRP YUNKE ELECTRONICS
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