Conductive CFRP Prepreg Structure for Through-Thickness Conductivity
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Solution Overview
Problem
Existing fiber-reinforced composite materials (CFRP) lack sufficient electrical conductivity in the thickness direction, requiring high amounts of expensive conductive particles, which increases cost and weight, and conventional methods to enhance conductivity often compromise mechanical properties or yield.
Innovation Solution
A fiber-reinforced composite material with conductive particles having a sphericity of 85% or more, sunk in the resin layer, connecting upper and lower reinforcing fiber layers, reducing the resin layer thickness and increasing conductivity while maintaining mechanical integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large amount of conductive particles is added to improve conductivity, then electrical conductivity is improved, but cost and weight increase
Solution Approach 1:
The invention changes the particle size parameter of conductive particles to a specific range (1-10 μm) and optimizes their distribution within the resin layer, achieving sufficient conductivity with reduced particle content. This parameter optimization allows obtaining the desired electrical conductivity (0.5 S/m or more) while minimizing the amount of conductive particles added, thereby reducing both cost and weight.
2Reliability
If conductive particles are added to improve conductivity, then electrical conductivity is improved, but manufacturing cost increases
Solution Approach 1:
The invention optimizes the particle size parameter to 1-10 μm, which achieves effective conductivity improvement with minimal particle addition. This parameter selection avoids the need for expensive particle classification processes and reduces the total amount of conductive particles required, thereby lowering manufacturing cost while maintaining sufficient electrical conductivity.
3Reliability
If the resin layer thickness is reduced to improve conductivity, then electrical conductivity is improved, but mechanical integrity may be compromised
Solution Approach 1:
The invention applies local quality by concentrating conductive particles specifically within the resin layer rather than uniformly distributing them throughout the entire composite. This localized particle placement within the resin layer improves conductivity without requiring overall thickness reduction, thereby maintaining the mechanical integrity provided by the reinforcing fiber layers while achieving the desired electrical conductivity.
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 material achieves sufficient conductivity with a reduced addition of conductive particles, lowering costs and simplifying lightning protection systems, contributing to weight reduction and cost savings in applications like aircraft.
Implementation Method 1
conductive particles having a sphericity of 85% or more are disposed in the resin layer, and the fiber-reinforced composite material has a portion where upper and lower reinforcing fiber layers are connected by one conductive particle
Data Source
AI summary
A fiber-reinforced composite material including reinforcing fiber layers and a resin layer sandwiched therebetween, wherein conductive particles having a sphericity of 85% or more are disposed in the resin layer, and the fiber-reinforced composite material has a portion where upper and lower reinforcing fiber layers are connected by one conductive particle and has a portion where a conductive particle is sunk in a reinforcing fiber layer. Provided is a fiber-reinforced composite material having sufficient electrical conductivity in a thickness direction with a small addition amount of conductive particles.