Carbon Nanotube Composite Wire with Thick Metal Coating
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Solution Overview
Problem
Conventional ultrafine wires, including carbon nanotube wires, face reduced tensile strength when diameters are between 1 micrometer and 50 micrometers, and the metal coating used to improve conductivity is prone to oxidation, leading to low durability.
Innovation Solution
A carbon nanotube composite wire is developed by coating a metal layer of 1-5 micrometers thickness on a carbon nanotube wire with a twist of 10-300 turns per centimeter, enhancing mechanical and electrical properties through a close bond between carbon nanotubes and the metal layer, which improves conductivity and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal layer is coated on the carbon nanotube wire surface to improve conductivity, then the electric conductivity is improved, but the durability is reduced due to oxidation of the thin metal layer
Solution Approach 1:
The patent changes the thickness parameter of the metal layer from conventional thin coating (1-50 nm) to a thicker layer (1-5 micrometers). This parameter change simultaneously improves electrical conductivity by providing more conductive material while enhancing durability by creating a sufficiently thick barrier that resists oxidation and environmental degradation.
Solution Approach 2:
The patent creates a composite structure consisting of a carbon nanotube wire core surrounded by a metal layer. This composite material combines the high strength and flexibility of carbon nanotubes with the excellent electrical conductivity and oxidation resistance of the metal layer, achieving both improved conductivity and enhanced durability.
2Length of moving object
If the diameter of ultrafine wire is reduced to 1-50 micrometers, then the flexibility and fineness are improved, but the tensile strength is significantly reduced
Solution Approach 1:
The patent employs a composite structure where carbon nanotubes form the core of the ultrafine wire. Carbon nanotubes possess exceptional tensile strength even at nanoscale diameters, allowing the wire to maintain high strength despite the reduced overall diameter of 1-50 micrometers, thereby achieving both flexibility and mechanical integrity.
Solution Approach 2:
The patent applies different materials with specialized properties to different regions of the wire structure. The carbon nanotube core provides localized high strength and flexibility, while the surrounding metal layer provides localized electrical conductivity and environmental protection, allowing the wire to achieve superior overall performance at ultrafine dimensions.
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 carbon nanotube composite wire achieves significant improvements in mechanical strength, electrical conductivity, and durability, with tensile stresses reaching 900 MPa and conductivity comparable to copper, while maintaining mechanical integrity under high temperatures.
Implementation Method 1
the surface of the carbon nanotube wire is coated by a metal layer with a thickness of 1 nanometer to 50 nanometers
Implementation Method 2
a close bond between carbon nanotubes and the metal layer
Data Source
AI summary
A carbon nanotube composite wire includes a carbon nanotube wire and a metal layer. The carbon nanotube wire includes a plurality of carbon nanotubes spirally arranged along an axial direction of the carbon nanotube wire. The diameter of the carbon nanotube wire ranges from about 1 micrometer to about 30 micrometers. The twist of the carbon nanotube wire ranges from about 250 t/cm to about 300 t/cm. The metal layer is coated on a surface of the carbon nanotube wire. The thickness of the metal layer ranges from about 1 micrometer to about 5 micrometers.