Sulfurization Detection Resistor With Stepwise Resistance Sensing
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Solution Overview
Problem
Existing sulfurization detection methods face challenges in accurately detecting the degree of sulfurization in electronic parts due to subtle color changes and significant resistance value changes with temperature, requiring large-scale equipment and being prone to errors.
Innovation Solution
A sulfurization detection resistor with multiple sulfurization detecting conductors connected in parallel, each set designed to disconnect at different timings based on cumulative sulfurization, allowing for stepwise resistance value changes and accurate detection, featuring identical exposed surface areas and varying Pd content or film thicknesses for differentiated disconnection timings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sulfurization detector made principally of Ag is used to detect sulfurization, then the detector can respond to sulfide gas exposure, but the resistance value changes significantly with temperature making accurate detection difficult
Solution Approach 1:
The patent changes the material composition parameter of the detection electrode from pure Ag to Ag-Pd alloy. This material parameter change fundamentally alters the temperature characteristic (TCR) from very poor in pure Ag to excellent in Ag-Pd alloy, while maintaining the sulfurization detection capability. The Pd content is specifically controlled at 1-10 atomic percent to achieve the desired balance between detection sensitivity and temperature stability.
2Ease of manufacture
If visual detection of color change is used, then no additional equipment is needed, but accurate detection of subtle color changes is difficult
Solution Approach 1:
The patent replaces the mechanical/visual detection system with an electrical measurement system. Instead of relying on human visual perception of subtle color changes, the invention uses resistance value measurement to detect sulfurization. This substitution provides objective, quantifiable, and highly precise detection while maintaining ease of implementation through standard electrical measurement techniques.
3Measurement precision
If multiple sulfurization detecting conductors with different Pd content are used, then stepwise resistance changes enable accurate detection timing, but device structure becomes more complex
Solution Approach 1:
The patent segments the detection function into multiple parallel conductors (first, second, and third sulfurization detecting conductors) with progressively different Pd content (1-5 atomic percent, 5-10 atomic percent, and 10 atomic percent respectively). Each segment responds to sulfurization at different thresholds, creating stepwise resistance changes that provide detailed information about the cumulative amount of sulfurization. This segmentation transforms a single vague detection point into multiple precise detection stages.
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
Enables easy and accurate detection of sulfurization by ensuring stepwise resistance changes, preventing short circuits and ensuring conduction even when all detecting portions are disconnected, thus enhancing the reliability of sulfurization monitoring.
Implementation Method 1
silver turns into silver sulfide when it is continued to be exposed to sulfide gas
Implementation Method 2
the resistance value changes stepwisely and a degree of sulfurization can be detected accurately and easily
Data Source
AI summary
A sulfurization detection resistor makes it possible to detect a degree of sulfurization accurately and easily, and a manufacturing method for such sulfurization detection resistor. A sulfurization detection resistor includes an insulated substrate having a rectangular parallelepiped shape, a first front electrode and a second front electrode formed at both ends on a main surface of the insulated substrate, multiple sulfurization detecting conductors connected in parallel to the first front electrode, multiple resistive elements connected between the sulfurization detecting conductors and the second front electrode, and a protective film formed to partially cover the sulfurization detecting conductors and entirely cover the resistive elements. The sulfurization detecting conductors have their sulfurization detecting portions exposed out of the protective film, and different timings are set for these sulfurization detecting portions respectively to become disconnected depending on a cumulative amount of sulfurization.