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Negative temperature coefficient thermistor with nano particle film, and preparation method thereof

A negative temperature coefficient, thermistor technology, applied in the direction of resistors with negative temperature coefficients, resistance terminals/electrodes, etc., can solve the problem of weak electrode protection, the influence of the performance of the base element, and the weak adhesion of glass and electrode layers, etc. problem, to achieve the effect of increasing the bonding strength

Active Publication Date: 2018-01-23
JIANGSU SHIRUI ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The electrodes used in negative temperature coefficient (NTC) thermistors are mostly noble metal electrodes, such as silver, gold, platinum, etc. Silver paste is the electrode material commonly used in the production of NTC thermistors at home and abroad, but silver ions are easy to migrate in the matrix material , which affects the performance of the base element
In addition, when researching and producing NTC thermistor electrodes, the electrode protective layer usually uses glass as the protective layer, but the adhesion between the glass and the electrode layer is not strong, and the protection effect on the electrode is weak

Method used

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  • Negative temperature coefficient thermistor with nano particle film, and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0024] A method for preparing a negative temperature coefficient thermistor with a nano-particle film includes the following steps:

[0025] (1) First soak the ceramic substrate with 5% hydrofluoric acid for 5 minutes, and then ultrasonically clean it with acetone, alcohol and deionized water for 10 minutes. After cleaning, it is purged with nitrogen and sealed for use;

[0026] (2) Use pre-sputtering to remove the oxide layer on the surface of the ceramic substrate, and then coat a layer of metallic nickel to form a transition layer, where the thickness of the nickel layer is 0.2 μm;

[0027] (3) Using magnetron sputtering to sputter a layer of metallic copper on the transition layer to form a copper electrode layer, the thickness of the copper electrode layer is 2 μm;

[0028] (4) After the copper electrode in step (3) is connected to the pins, a layer of nano aluminum film is sputtered on the surface of the copper electrode layer by magnetron sputtering. The substrate temperature fo...

Embodiment 2

[0031] A method for preparing a negative temperature coefficient thermistor with a nano-particle film includes the following steps:

[0032] (1) First soak the ceramic substrate with 5% hydrofluoric acid for 5 minutes, and then ultrasonically clean it with acetone, alcohol and deionized water for 10 minutes. After cleaning, it is purged with nitrogen and sealed for use;

[0033] (2) Use pre-sputtering to remove the oxide layer on the surface of the ceramic substrate, and then coat a layer of metallic nickel to form a transition layer, the thickness of the nickel layer is 0.5 μm;

[0034] (3) Using magnetron sputtering to sputter a layer of metallic copper on the transition layer to form a copper electrode layer, the thickness of the copper electrode layer is 1 μm;

[0035] (4) After the copper electrode in step (3) is connected to the pins, a layer of nano aluminum film is sputtered on the surface of the copper electrode layer by magnetron sputtering. The substrate temperature of the n...

Embodiment 3

[0038] A method for preparing a negative temperature coefficient thermistor with a nano-particle film includes the following steps:

[0039] (1) First soak the ceramic substrate with 5% hydrofluoric acid for 5 minutes, and then ultrasonically clean it with acetone, alcohol and deionized water for 10 minutes. After cleaning, it is purged with nitrogen and sealed for use;

[0040] (2) Using magnetron sputtering to sputter a layer of metallic copper on the surface of the ceramic substrate to form a copper electrode layer, the thickness of the copper electrode layer is 1 μm;

[0041] (3) After connecting the copper electrode in step (2) to the pins, a layer of nano aluminum film is sputtered on the surface of the copper electrode layer by magnetron sputtering. The substrate temperature for sputtering the nano aluminum film is 100°C. The air pressure used is 2Pa,

[0042] Sintering in a weak oxidizing atmosphere, the thickness of the nano aluminum oxide film formed is 200 nm.

[0043] In th...

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Abstract

The invention discloses a negative temperature coefficient thermistor with a nano particle film, and a preparation method thereof. The thermistor comprises a ceramic substrate, a copper electrode layer formed by sputtering and arranged on the ceramic substrate, a protective layer at the outside of the ceramic substrate and a pin on a lower end of the protective layer, and the protective layer is stacked on the surface of the copper electrode layer; and the protective layer is formed by a nano alumina film. The preparation method comprises the following steps: (1) cleaning the ceramic substrate, and drying the same; (2) sputtering copper on the surface of the ceramic substrate in a magnetron sputtering manner to form the copper electrode layer; and (3) after the pin is connected to the copper electrode, sputtering a layer of nano aluminum film on the surface of the copper electrode layer in the magnetron sputtering manner, and performing sintering in a weak oxidizing atmosphere to formthe nano alumina film. According to the negative temperature coefficient thermistor disclosed by the invention, the copper is used as the electrode layer, the nano aluminum and copper form a solid solution alloy, thereby enhancing the bonding strength of the electrode layer and the nano aluminum, and the sintering is performed in the weak oxidizing atmosphere at a low vacuum degree, so that the surface of the nano aluminum is oxidized to form a layer of dense alumina film so as to function as a protective layer.

Description

Technical field [0001] The invention discloses a negative temperature coefficient thermistor with a nano particle film and a preparation method thereof, belonging to the technical field of thermistors. Background technique [0002] Temperature is a physical quantity that characterizes the degree of physical heat and cold. It can be measured indirectly through certain characteristics (such as resistance, voltage change, etc.) of an object that changes with temperature. Thermal elements are mostly made of positive temperature coefficient or negative temperature coefficient thermal materials. [0003] Negative temperature coefficient (NTC) thermistors use precious metal electrodes, such as silver, gold, platinum, etc. Silver paste is the electrode material commonly used in the production of NTC thermistors at home and abroad, but silver ions easily migrate in the matrix material , Have an impact on the performance of the original substrate. In addition, when researching and producin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/04H01C1/14
Inventor 汪洋
Owner JIANGSU SHIRUI ELECTRONICS CO LTD
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