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A kind of negative temperature coefficient thermistor with nanoparticle film and its preparation method

A technology of negative temperature coefficient and thermistor, which is applied in the direction of resistors with negative temperature coefficient, resistance terminals/electrodes, etc., which can solve the problem of weak electrode protection, weak adhesion between glass and electrode layers, and influence on the performance of substrate components, etc. problems, to achieve the effect of increasing the bonding strength

Active Publication Date: 2019-06-18
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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  • A kind of negative temperature coefficient thermistor with nanoparticle film and its preparation method

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Embodiment 1

[0024] A preparation method of a negative temperature coefficient thermistor with a nanoparticle film, comprising the steps of:

[0025] (1) Soak the ceramic substrate with 5% hydrofluoric acid for 5 minutes, then ultrasonically clean it with acetone, alcohol and deionized water for 10 minutes, clean it with nitrogen, and seal it 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, wherein the thickness of the nickel layer is 0.2 μm;

[0027] (3) A layer of metal copper is sputtered on the transition layer by magnetron sputtering to form a copper electrode layer, and the thickness of the copper electrode layer is 2 μm;

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

Embodiment 2

[0031] A preparation method of a negative temperature coefficient thermistor with a nanoparticle film, comprising the steps of:

[0032] (1) Soak the ceramic substrate with 5% hydrofluoric acid for 5 minutes, then ultrasonically clean it with acetone, alcohol and deionized water for 10 minutes, clean it with nitrogen, and seal it for use;

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

[0034] (3) A layer of metal copper is sputtered on the transition layer by magnetron sputtering to form a copper electrode layer, and 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, wherein the substrate temperature used for t...

Embodiment 3

[0038] A preparation method of a negative temperature coefficient thermistor with a nanoparticle film, comprising the steps of:

[0039] (1) Soak the ceramic substrate with 5% hydrofluoric acid for 5 minutes, then ultrasonically clean it with acetone, alcohol and deionized water for 10 minutes, clean it with nitrogen, and seal it for use;

[0040] (2) A layer of metal copper is sputtered on the surface of the ceramic substrate by magnetron sputtering to form a copper electrode layer, and the thickness of the copper electrode layer is 1 μm;

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

[0042] Sintering in a weak oxidizing atmosphere to form a nano-alumina film with a thickness of 200nm.

[0043] In the present embodiment, the...

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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 nanoparticle 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 coldness and heat. It can be indirectly measured through certain characteristics of objects that change with temperature (such as resistance, voltage change, etc.). Most of the thermal elements are made of positive temperature coefficient or negative temperature coefficient thermal materials. [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 , have an impact on the performance of the base element. In a...

Claims

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Application Information

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