CNT-Metal Conductive Elements for High-Current Lightweight Wiring
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Solution Overview
Problem
Current conductive elements, such as wires, face limitations in increasing current carrying capacity and reducing weight or size, particularly in aerospace and automotive applications, where existing methods do not effectively utilize carbon nanotubes for improved conductivity and spinnability.
Innovation Solution
A method involving growing carbon nanotubes on a metallic substrate, applying a shear force, and coating them with a metallic material to create a conductive element precursor, which can be processed into elongated conductive elements like wires or tapes, ensuring intimate contact and protection of the nanotubes for enhanced conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional conductive elements are used, then current carrying capacity is limited, but weight reduction is achieved
Solution Approach 1:
The patent employs a composite structure consisting of carbon nanotubes coated with metallic material (such as copper) to create a hybrid conductive element. The carbon nanotubes provide high strength-to-weight ratio and exceptional electrical conductivity, while the metallic coating enhances current carrying capacity and facilitates integration with conventional electrical systems. This composite approach enables simultaneous achievement of weight reduction and increased current carrying capacity, resolving the technical contradiction between these two parameters.
2Reliability
If carbon nanotubes are grown on metallic substrate, then conductivity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent employs preliminary actions by pre-growing carbon nanotubes on metallic substrates (such as copper foil) before final product formation. The substrates are prepared with catalyst layers, and carbon nanotubes are grown in controlled environments to achieve desired alignment and density. This preliminary preparation enables subsequent simple coating and forming operations, reducing overall manufacturing complexity while ensuring high conductivity through pre-optimized nanotube structures.
Solution Approach 2:
The metallic substrate serves as an intermediary between the carbon nanotube growth process and the final conductive element. The substrate provides a stable platform for nanotube growth, facilitates heat and mass transfer during synthesis, and acts as a temporary carrier that simplifies handling and processing. The substrate can be removed or integrated in subsequent steps, enabling complex nanotube structures to be manufactured through simplified sequential processes.
3Reliability
If shear force is applied to align carbon nanotubes, then conductivity is enhanced, but mechanical damage risk increases
Solution Approach 1:
The patent employs parameter changes by carefully controlling the magnitude, direction, and duration of applied shear forces during nanotube alignment. By optimizing these mechanical parameters, the patent achieves sufficient alignment to enhance conductivity along the wire axis while maintaining forces below the threshold that would cause nanotube breakage. The metallic coating and substrate provide mechanical support during alignment, distributing stresses and preventing catastrophic failure, thus resolving the contradiction between conductivity enhancement and mechanical integrity.
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 method results in high-quality conductive elements with improved conductivity and mechanical properties, suitable for applications requiring increased current carrying capacity and reduced weight, such as in aerospace and automotive industries.
Implementation Method 1
growing a plurality of carbon nanotubes on a metallic substrate
Implementation Method 2
applying a shear force to the plurality of carbon nanotubes on the metallic substrate in a first direction
Implementation Method 3
coating carbon nanotubes of the plurality of carbon nanotubes on the metallic substrate with a metallic material
Data Source
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AI summary
Methods for producing a conductive element precursor and a conductive element, such as a tape or wire, are provided. The methods comprise growing a plurality of carbon nanotubes on a metallic substrate and coating carbon nanotubes of the plurality of carbon nanotubes on the metallic substrate with a metallic material.