Amorphous-Carbon-Coated Graphite Fillers for Conductive Resin Strength
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Solution Overview
Problem
Conductive resin composites face a trade-off between high conductivity and strength due to peeling and cleavage issues at the interface between resin materials and graphite particles, leading to reduced strength and gas permeation.
Innovation Solution
A composite conductive filler particle comprising a graphite particle covered by amorphous carbon, with specific volume average diameters and mass ratios, is used to enhance conductivity while minimizing interface peeling and cleavage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If graphite particles are added in large quantity to resin material as conductive filler, then conductivity of conductive resin composite is improved, but strength and gas impermeableness deteriorate due to peeling at interface and cleavage of graphite particles
Solution Approach 1:
The invention uses a composite filler particle consisting of graphite particles covered with amorphous carbon. This composite structure combines the high conductivity of graphite with the strong adhesion properties of amorphous carbon, resolving the contradiction between achieving high conductivity and maintaining strength. The amorphous carbon layer acts as an interfacial material that bonds both the graphite core and the resin matrix, preventing peeling and cleavage while preserving the conductive pathway.
2Reliability
If graphite particles are added in large quantity to resin material as conductive filler, then conductivity of conductive resin composite is improved, but gas impermeableness deteriorates due to peeling at interface and cleavage of graphite particles
Solution Approach 1:
The composite filler structure with amorphous carbon coating prevents gas permeation by eliminating interface peeling and particle cleavage. The amorphous carbon layer creates a continuous, intact barrier that blocks gas pathways, while the graphite core maintains electrical conductivity. This resolves the contradiction between achieving high conductivity and preventing gas permeation.
Data Source
Figure 1(a)~1(b)
Figure 2(a)~2(b)
AI summary
Provided are: composite conductive filler particles 10 having graphite particles 2 and amorphous carbon 1 with which the graphite particles are coated; a conductive resin composition 20 having a resin material 3 and the composite conductive filler particles 10 dispersed in the resin material 3; and a conductive resin composition molded article formed by molding the conductive resin composition 20.