CNT-Copper Composite Conductors With Bulk Electrodeposited Copper
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Solution Overview
Problem
Conventional copper and aluminum conductor materials used in wire and cabling are near the limit of electrical conductivity and current carrying capacity, requiring heavy reinforcement for mechanical and thermal stability, and existing carbon nanotube-copper composite materials suffer from significant tensile strength loss and complex manufacturing processes involving organic solvents.
Innovation Solution
A composite electrical conductor material featuring a non-metallic conductive porous matrix, such as carbon nanotube fabric, impregnated with copper particles and clusters interconnected by copper dendrites, achieved through a controlled aqueous acidic or basic copper electrodeposition process, allowing copper to be deposited within the bulk of the matrix rather than just on its surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional copper or aluminum conductor materials are used to achieve high electrical conductivity and current carrying capacity, then electrical performance is improved, but mechanical strength and thermal stability deteriorate requiring heavy reinforcement
Solution Approach 1:
The patent employs a composite structure consisting of carbon nanotube fibers as the base material with copper metal deposited within the internal porous network. This composite architecture combines the high tensile strength and thermal stability of carbon nanotubes with the excellent electrical conductivity of copper, resolving the contradiction between electrical performance and mechanical strength that plagues conventional pure metal conductors.
2Reliability
If carbon nanotube-copper composite materials are fabricated by known electrodeposition methods, then copper coating is achieved, but tensile strength is significantly reduced by 35-50%
Solution Approach 1:
The invention utilizes the inherent porous internal network structure of carbon nanotube fibers as the deposition substrate. Copper metal is electrodeposited within this three-dimensional porous network rather than as a surface coating, which allows the copper to be mechanically integrated within the CNT structure without compromising the tensile strength of the underlying carbon nanotube framework.
Solution Approach 2:
The copper metal is nested within the internal porous network of the carbon nanotube fibers, creating a hierarchical structure where the copper fills the void spaces inside the CNTs. This nesting approach allows copper to contribute to electrical conductivity while the outer CNT structure maintains mechanical integrity, avoiding the tensile strength loss associated with surface coating methods.
3Reliability
If CNT-Cu composites are fabricated by two-stage nucleation-growth electrodeposition process, then complete filling of CNT fiber mesoporous structures is achieved, but manufacturing complexity increases due to use of organic solvents
Solution Approach 1:
The invention modifies the electrodeposition parameters by using a single-stage process with aqueous electrolyte containing copper sulfate and sulfuric acid, eliminating the need for organic solvents and two-stage processing. The process achieves complete filling of CNT mesoporous structures by optimizing the electrodeposition conditions including voltage, time, and electrolyte composition, thereby simplifying the manufacturing process while maintaining effective copper infiltration.
4Reliability
If copper coating thickness is increased to improve current carrying capacity, then ampacity is enhanced, but tensile strength is significantly reduced
Solution Approach 1:
The porous internal network of carbon nanotube fibers provides a three-dimensional scaffold that supports thicker copper deposits without compromising mechanical strength. The copper fills the internal void spaces of the porous structure, distributing the mass throughout the volume rather than concentrating it at the surface, which allows increased current carrying capacity while maintaining the structural integrity provided by the CNT framework.
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 resulting composite conductor exhibits significantly higher electrical conductivity and current carrying capacity than pure copper, with a lower mass and improved environmental stability, making it suitable for lightweight power transmission systems in aerospace and electronic applications.
Implementation Method 1
a controlled aqueous acidic or basic copper electrodeposition process, allowing copper to be deposited within the bulk of the matrix rather than just on its surface
Data Source
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AI summary
Provided herein are composite conductors, characterized by having copper deposits inside the bulk rather than on the outer surface of a non-metallic conductive porous matrix, such as CNT fabric, as well as a process for obtaining the same. The composite conductors provided herein are also characterized by a low specific weight and a high ampacity compared to metal conductors of similar size and shape.