Resistive Material Three-Dimensional Network Structure
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Solution Overview
Problem
Resistive materials with insulating matrix materials face instability in resistance characteristics due to changes in metal particle contact states, especially under temperature changes and high voltage applications, leading to unreliable electrical resistance.
Innovation Solution
A resistive material with a metal body forming a three-dimensional network around insulating particles, with a volume ratio of the metal body between 30% and 80%, ensuring stable conduction paths and resistance characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating material is used as the matrix material with metal particles added, then electrical resistance is high, but it is difficult to ensure stable flow paths for current and the contacting state between metal particles changes depending on usage situation
Solution Approach 1:
The patent uses a composite material structure where metal particles are dispersed in an insulating matrix material. This composite structure allows the metal particles to form conduction paths while the insulating matrix provides structural support and maintains particle positions, resolving the contradiction between achieving high resistance and ensuring stable current flow paths.
Solution Approach 2:
The patent applies local quality by having metal particles concentrated in specific regions to form conduction paths, while the surrounding insulating matrix material provides electrical isolation. This local differentiation allows stable current flow through metal particle networks while maintaining overall resistance stability.
2Reliability
If metal particles are added to insulating material to form resistive material, then resistance value can be adjusted, but resistance value changes due to temperature change and dielectric breakdown occurs under high voltage
Solution Approach 1:
The insulating matrix material acts as an intermediary between metal particles, providing thermal and electrical isolation that stabilizes the resistance characteristic. This intermediary prevents direct interaction between metal particles that would cause resistance changes under temperature variations and high voltage stress.
Solution Approach 2:
The patent controls the proportion of metal particles to insulating matrix material to optimize resistance characteristics. By adjusting this parameter ratio, the resistive material achieves stable resistance values that are less sensitive to temperature changes and high voltage applications.
3Reliability
If metal particles are subjected to flattening process to ensure flow paths, then conduction paths are improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts the conduction path formation function from the metal particle shape itself and relies instead on the spatial arrangement and proportion of particles in the composite structure. This eliminates the need for complex flattening processes while still ensuring stable current flow paths through the metal particle network.
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 three-dimensional network structure stabilizes resistance characteristics and increases specific resistance, reducing the impact of temperature changes and high voltage applications, while maintaining a suitable range for current sensing applications.
Implementation Method 1
a metal body having a three-dimensional network enclosing the particles
Data Source
AI summary
A resistive material for sensing current contains particles having an electrically insulating property and a metal body having a three-dimensional network enclosing the particles, and a ratio of the metal body to the whole of the resistive material is 30 vol % or more and 80 vol % or less.