Graphene-Reinforced Copper for High-Current Thermal Stability
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Solution Overview
Problem
Existing copper conductors experience thermal breakdown and high power consumption due to resistivity and temperature rise when high currents flow, limiting their efficiency and reliability in high-current devices.
Innovation Solution
Graphene-reinforced ultra-conductive copper, where carbon atoms of graphene are distributed among copper atoms, forming metallic covalent bonds, offering low temperature coefficient of resistance, small coefficient of thermal expansion, and high current density, reducing thermal breakdown and material consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pure copper is used as conductor material, then electrical conductivity is high (100% IACS), but thermal breakdown occurs and material consumption increases under high current conditions
Solution Approach 1:
The patent creates a composite material by distributing graphene quantum dots (GQDs) within the copper matrix. The GQDs act as nucleation sites for copper grain growth, creating a refined microstructure that simultaneously improves thermal stability and reduces material consumption. This composite approach allows the conductor to withstand high current densities without thermal breakdown while maintaining lower copper usage.
Solution Approach 2:
The patent changes the microstructural parameters of copper by controlling grain size through GQD addition. The average grain size is reduced to 5-15 μm, which fundamentally alters the thermal and electrical properties. This parameter change enables the material to operate at higher current densities with improved thermal stability and reduced resistive heating.
2Productivity
If high current density is required for high-current devices, then power transmission efficiency improves, but temperature rise and thermal breakdown increase
Solution Approach 1:
The graphene-copper composite structure provides enhanced thermal management capabilities. The GQDs create a refined grain structure that reduces electron scattering and resistive heating, allowing higher current densities to be sustained with minimal temperature rise. The composite material effectively dissipates heat while maintaining high current carrying capacity.
Solution Approach 2:
By controlling the grain size parameter to 5-15 μm through GQD addition, the material achieves optimal electrical and thermal properties. The refined grain structure reduces electrical resistance and improves heat dissipation, enabling high current density operation without excessive temperature increase.
3Reliability
If copper grain size is reduced to improve electrical properties, then electrical conductivity improves, but material strength and thermal resistance may deteriorate
Solution Approach 1:
The GQDs serve as effective nucleation sites that control copper grain growth, creating a refined microstructure with average grain size of 5-15 μm. This composite approach strengthens the material through grain refinement (Hall-Petch strengthening) while maintaining high electrical conductivity. The GQDs themselves act as reinforcement, preventing grain boundary sliding and dislocation movement, thereby improving mechanical strength.
Solution Approach 2:
The patent optimizes the grain size parameter to a specific range (5-15 μm) that balances electrical conductivity and mechanical strength. This controlled grain refinement, achieved through GQD addition, simultaneously improves electrical properties by reducing electron scattering at grain boundaries while strengthening the material through increased grain boundary density and dispersion strengthening.
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 graphene-reinforced copper enhances efficiency and reliability in high-current devices by minimizing temperature rise and power loss, enabling higher current densities and extending the lifespan of copper materials.
Implementation Method 1
the copper atoms are bonded with the carbon atoms of the graphene to form metallic covalent bonds
Implementation Method 2
The graphene-reinforced ultra-conductive copper has characteristics such as low temperature coefficient of resistance (TCR), small coefficient of thermal expansion (CTE), and high current density
Implementation Method 3
the graphene-reinforced ultra-conductive copper experiences a small temperature rise and exhibits low TCR when a current flows through the graphene-reinforced ultra-conductive copper
Data Source
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AI summary
The present disclosure provides a use of graphene-reinforced ultra-conductive copper in a field of high-current devices, and belongs to the technical field of conductor materials. In the graphene-reinforced ultra-conductive copper of the present disclosure, carbon atoms of graphene are distributed in gaps among copper atoms. This structure can lead to an exceptionally robust internal structure for the copper material, and thus makes the copper material have properties such as low temperature coefficient of resistance (TCR), small coefficient of thermal expansion (CTE), and high current density. Therefore, the graphene-reinforced ultra-conductive copper is suitable for devices requiring a high current and a low temperature, including electric vehicles (charging/motors/signals), drones, semiconductor electronics, and defense/military-grade wires. The graphene-reinforced ultra-conductive copper is a novel conductor material that integrates energy conservation, heat reduction, pressure resistance, and cost effectiveness.