Carbon Nanotube Metal Conductors for Higher Current in Smaller Cables
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Solution Overview
Problem
Existing conductive elements, particularly wires and cables, face challenges in increasing current carrying capacity, reducing weight, and minimizing size, which are crucial for applications like aerospace and automotive to reduce fuel consumption and CO2 emissions.
Innovation Solution
A method involving the growth of aligned carbon nanotubes on a metallic substrate, application of a shear force, and coating with a metallic material to form a conductive element precursor, followed by rolling and drawing to create a conductive element, ensuring the carbon nanotubes are in intimate contact and aligned for improved conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional conductive elements are used, then current carrying capacity is limited, but increasing the size of cables is required to improve current carrying capacity
Solution Approach 1:
The invention uses composite materials by combining carbon nanotubes with metallic substrate to create a conductive element that achieves higher current carrying capacity without increasing cable size. The carbon nanotubes are grown on the metallic substrate to form an integrated composite structure that leverages the high electrical conductivity of both materials.
Solution Approach 2:
The invention applies local quality by creating regions of high electron density at the interface between carbon nanotubes and metallic substrate. This localized enhancement of conductive properties at the interface allows the material to achieve superior overall conductivity without requiring increased volume.
2Quantity of substance
If conventional conductive elements are used, then current carrying capacity is limited, but increasing the weight of cables is required to improve current carrying capacity
Solution Approach 1:
The composite structure of carbon nanotubes on metallic substrate provides high current carrying capacity while maintaining low weight. Carbon nanotubes have exceptional strength-to-weight ratio and high electrical conductivity, allowing the cable to be both lighter and more conductive than conventional materials.
Solution Approach 2:
The invention changes the physical parameters of the conductive element by incorporating carbon nanotubes with superior electrical and mechanical properties. This parameter change enables achieving higher current carrying capacity with reduced weight compared to traditional metallic conductors.
3Quantity of substance
If conventional conductive elements are used, then current carrying capacity is limited, but increasing the size of cables is required
Solution Approach 1:
The carbon nanotubes are grown on the metallic substrate in advance to form an integrated structure before the cable is manufactured. This preliminary formation of the composite structure simplifies subsequent cable fabrication processes and eliminates the need for complex assembly steps to achieve high current carrying capacity.
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 produces high-quality conductive elements with enhanced conductivity and reduced weight, suitable for forming wires and tapes, addressing the need for improved current carrying capacity and size reduction.
Implementation Method 1
forming 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 with a metallic material
Data Source
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.