Conductive Adhesive Composition for Through-Thickness Carbon Composite Bonding
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Solution Overview
Problem
Existing electrically conductive adhesives exhibit poor through-thickness transverse electrical conductivity when bonding carbon fiber-reinforced resin composites, leading to potential delamination or incineration during lightning strikes in wind turbine blades, as they lack effective electrical continuity across the thickness of bonded stacks.
Innovation Solution
An electrically conductive adhesive composition is developed, comprising milled carbon fibers dispersed in a thermosetting resin and a curative agent, with the milled carbon fibers having specific diameter and length ranges, enhancing the adhesive's conductivity and ensuring electrical continuity through the thickness of bonded components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adhesives are used to bond carbon fiber-reinforced resin composites, then bonding strength is achieved, but through-thickness electrical conductivity is poor
Solution Approach 1:
The patent uses a composite adhesive formulation combining thermosetting resin with conductive fillers (carbon black, graphite, or metal particles) to achieve both bonding strength and electrical conductivity. This composite approach allows the adhesive to simultaneously provide mechanical adhesion and electrical continuity through the thickness of bonded carbon fiber components.
Solution Approach 2:
The patent modifies the electrical properties of the adhesive by adjusting filler concentration, particle size distribution, and resin composition. By changing these parameters, the adhesive achieves adequate electrical conductivity while maintaining proper bonding characteristics and workability.
2Reliability
If milled carbon fibers are used in the adhesive, then through-thickness electrical conductivity is improved, but handling safety and cost are enhanced compared to nanomaterials
Solution Approach 1:
The patent converts the potentially harmful effect of lightning strikes into a beneficial protective function by creating a controlled conductive path through the adhesive. The milled carbon fibers provide this path, allowing lightning energy to dissipate safely through the bonded structure rather than causing arcing and delamination between layers.
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 solution significantly improves the through-thickness electrical conductivity of bonded carbon fiber-reinforced resin composites, reducing the risk of arcing and damage from lightning strikes by maintaining electrical continuity, while being cost-effective and safer to handle compared to nanomaterials, and ensuring compatibility with carbon plates.
Implementation Method 1
milled carbon fibers dispersed in a thermosetting resin and a curative agent, wherein the milled carbon fibers have an average diameter in the range of 5 to 10 microns and an average length in the range of 1 to 300 microns, and wherein the adhesive composition has a linear conductivity in the range of 10-14
Data Source
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AI summary
Disclosed herein is an electrically conductive adhesive composition, articles comprising at least two components adhesively bonded by the electrically conductive adhesive composition and methods of making such adhesives and articles. The electrically conductive adhesive composition includes milled carbon fibers dispersed in a thermosetting resin and a curative agent.