Copper-Silver Alloy Conduction Parts via Pulsed-Light Synthesis
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Solution Overview
Problem
Conventional methods fail to easily synthesize copper-silver alloys at low temperatures in a short time, leading to issues like increased resistivity due to oxidation and complex processes, making them unsuitable for wearable devices.
Innovation Solution
A method involving the formation of fine crystal nuclei of copper and silver through heating and subsequent irradiation with pulsed light to create a copper-silver alloy with a crystal grain diameter of 0.1 μm or less, optimizing conditions to prevent oxidation and achieve a homogeneous structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional heat treatment methods are used to form copper-silver alloy, then the alloy can be synthesized, but the process requires high temperature and long time which are unsuitable for wearable devices
Solution Approach 1:
The invention utilizes phase transition of water (from liquid to vapor) through pulsed light irradiation to generate localized high temperature that promotes alloy formation. The pulsed light causes rapid heating and phase transition of water molecules in the ink, creating temporary high-temperature zones that enable copper-silver alloy synthesis at lower overall temperatures and shorter times compared to conventional heat treatment.
Solution Approach 2:
The invention employs periodic pulsed light irradiation instead of continuous heating. The pulsed light delivers energy in short, intense bursts that create rapid thermal cycles, enabling alloy formation in seconds rather than the prolonged heating required by conventional methods. This periodic action achieves synthesis at lower average temperatures while dramatically reducing processing time.
2Ease of manufacture
If copper ink is used for conduction parts, then the process is simple, but resistivity increases due to oxidation
Solution Approach 1:
The invention creates a composite copper-silver alloy material that combines the advantages of both metals. Silver provides oxidation resistance while copper provides conductivity. The alloy maintains the simplicity of copper ink application but gains the oxidation resistance of silver, eliminating the need for complex protective measures while improving reliability.
Solution Approach 2:
The invention changes the chemical composition parameter of the conductive material from pure copper to copper-silver alloy. This parameter change fundamentally alters the oxidation resistance property while maintaining electrical conductivity. The alloy composition is optimized to balance conductivity and oxidation resistance, solving the reliability issue without complicating the manufacturing process.
3Reliability
If silver ink is used to avoid oxidation, then oxidation resistance is improved, but cost increases and migration occurs
Solution Approach 1:
The copper-silver alloy creates a composite structure where silver particles are distributed within a copper matrix. This composite structure prevents silver migration because the silver particles are embedded in and restrained by the copper network, while still providing sufficient oxidation resistance. The alloy eliminates the migration problem of pure silver ink while maintaining oxidation protection.
4Ease of manufacture
If reducing agents are used in the synthesis process, then alloy formation is facilitated, but the process complexity and environmental impact increase
Solution Approach 1:
The invention replaces chemical reduction mechanisms with physical energy input (pulsed light). Instead of using reducing agents to chemically transform metal ions into metal particles, the pulsed light directly provides the energy needed for alloy formation through rapid heating and phase transitions. This substitution eliminates the need for complex reducing agent chemistry while maintaining alloy formation efficiency.
Solution Approach 2:
The water in the ink serves a dual function: as a solvent and as a heat transfer medium that undergoes phase transition to provide the necessary energy for alloy formation. The system uses its own component (water) to facilitate the synthesis process, eliminating the need for external reducing agents and simplifying the overall process.
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
This approach allows for the synthesis of copper-silver alloys with low resistivity and excellent oxidation resistance, suitable for forming conduction parts in wearable devices without the need for reducing agents or high-temperature processes.
Implementation Method 1
irradiating the crystal nuclei of copper and silver with pulsed light
Implementation Method 2
forming crystal nuclei of copper and silver having a crystal grain diameter of 0.2 μm or less
Data Source
AI summary
A method for synthesizing a copper-silver alloy includes an ink preparation step, a coating step, a crystal nucleus formation step and a crystal nucleus synthesis step. In the ink preparation step, a copper salt particle, an amine-based solvent, and a silver salt particle are mixed, thereby preparing a copper-silver ink. In the coating step, a member to be coated is coated with the copper-silver ink. In the crystal nucleus formation step, at least one of a crystal nucleus of copper having a crystal grain diameter of 0.2 μm or less and a crystal nucleus of silver having a crystal grain diameter of 0.2 μm or less is formed from the copper-silver ink. In the crystal nucleus synthesis step, the crystal nucleus of copper and the crystal nucleus of silver are synthesized.