Nickel Temperature Sensor Film With Chromium Oxide Adhesion Layer
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Solution Overview
Problem
The adhesion of nickel thin-films on resin film bases is poor, leading to peeling issues when heat treatment is applied to enhance the temperature coefficient of resistance (TCR) for improved temperature measurement accuracy.
Innovation Solution
An electroconductive film is developed with a chromium oxide thin-film as an underlying layer on the resin film base, enhancing the adhesion of the nickel thin-film. This configuration includes an optional silicon oxide thin-film interposed between the chromium oxide and nickel layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If heat treatment is performed to increase TCR, then temperature measurement accuracy is improved, but metal thin-film peeling occurs
Solution Approach 1:
A chromium oxide thin-film layer is introduced as an intermediary between the resin film base and the nickel thin-film. This intermediate layer acts as a mediator that enhances adhesion during heat treatment, allowing the TCR improvement to occur without causing metal thin-film peeling. The chromium oxide layer specifically addresses the interface between the organic resin base and the metal layer, providing chemical bonding that prevents peeling while the heat treatment increases TCR.
2Ease of manufacture
If nickel thin-film is formed directly on resin film base, then manufacturing process is simple, but adhesion is poor
Solution Approach 1:
The chromium oxide thin-film serves as an intermediary layer that chemically bonds to both the resin film base and the nickel thin-film. This intermediate layer specifically addresses the adhesion problem at the organic-inorganic interface, where chromium oxide forms strong chemical bonds with the resin base while also providing a suitable surface for nickel adhesion, thereby solving the poor adhesion issue without significantly complicating the manufacturing process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed film configuration achieves high adhesion of the nickel thin-film, maintaining integrity even after heat treatment, while also increasing the TCR to enhance temperature measurement accuracy.
Implementation Method 1
an underlying layer including a chromium oxide thin-film formed on one principal surface of a resin film base, and a metal thin-film formed on the underlying layer. By disposing the chromium oxide thin-film on the resin film base as the underlying layer and disposing the metal thin-film on the chromium oxide thin-film directly or with another inorganic thin-film interposed therebetween, adhesion of the metal thin-film tends to be improved.
Implementation Method 2
it was found that the TCR was increased by forming the metal thin-film on the resin film base and then performing a heat treatment
Implementation Method 3
the temperature is measured by applying a voltage to the thermometric resistor part through the lead part and using a characteristic that a resistance value of the metal varies depending on the temperature
Data Source
AI summary
Provided is an electroconductive film having a metal thin-film on a resin film base; and a temperature sensor film which is obtained by patterning the metal thin-film on the resin film base. An electroconductive film (101) which is used for the production of a temperature sensor film comprises a metal thin-film (10) on one principal surface of a resin film base (50), with a chromium oxide thin-film (21) serving as an underlying layer interposed therebetween. A temperature sensor film is obtained by patterning the metal thin-film so as to form a thermometric resistor part and a lead part that is connected to the thermometric resistor part.