Silver-Plated Conductive Composition for Oxidation Resistance
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Solution Overview
Problem
Existing electrically conductive compositions face challenges due to the high cost and oxidation issues of silver, and copper's conductivity is limited by its oxide formation, necessitating a more economical and stable conductive solution.
Innovation Solution
An electrically conductive composition using silver-plated filler particles with a binder system, allowing for lower sheet resistivity and flexibility in core materials, applied through various printing methods to form conductive tracts or circuitry on substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silver is used as conductive filler, then electrical conductivity is improved, but cost increases and oxidation risk increases
Solution Approach 1:
A barrier coating layer is applied to the silver filler particles to act as an intermediary between the silver and the oxidizing environment. This coating prevents direct contact between oxygen and the silver surface, thereby preventing oxidation while preserving the electrical conductivity of the silver core.
Solution Approach 2:
The invention uses composite filler particles consisting of a silver core surrounded by a protective barrier coating. This composite structure combines the high electrical conductivity of silver with the oxidation resistance of the coating material, achieving both conductivity and stability.
2Object-affected harmful factors
If copper is used as conductive filler, then cost is reduced, but electrical conductivity deteriorates due to oxide formation
Solution Approach 1:
A barrier coating is applied to copper filler particles to prevent oxidation. This coating layer blocks oxygen from reaching the copper surface, preventing the formation of non-conductive copper oxide and maintaining electrical conductivity while using the lower-cost copper material.
Solution Approach 2:
The invention employs composite copper particles with a protective coating shell. This composite structure preserves the electrical conductivity of copper by preventing oxide formation, while utilizing the cost advantage of copper over silver.
3Reliability
If entirely silver-filler based products are used, then electrical conductivity is maximized, but cost increases significantly
Solution Approach 1:
The invention applies local quality by using silver only where highest conductivity is critical (as a protective coating on the filler particles), while using cheaper coated copper or aluminum for the bulk filler material. This localized use of silver optimizes conductivity where needed while reducing overall cost.
Solution Approach 2:
The invention uses composite filler particles with cores of cost-effective materials (copper, aluminum) coated with thin layers of silver or other conductive materials. This composite approach achieves high conductivity with significantly reduced silver content compared to pure silver fillers.
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 composition achieves sheet resistivity below 0.100 Ohm/square at 25 μm, providing effective conductivity while being more economical and stable against oxidation, suitable for diverse electronic devices.
Implementation Method 1
Silver is utilized as an electrically conductive filler... because its oxide is electrically conductive, and therefore, silver filled systems encounter little or no loss of conductivity during high temperature curing, aging, or other conditions under which the silver may be oxidized
Implementation Method 2
The composition achieves sheet resistivity below 0.100 Ohm/square at 25 μm, providing effective conductivity
Data Source
AI summary
An electrically conductive composition comprising a binder and filler particles in which at least a portion of the particles are silver-plated. In one embodiment the composition comprises a binder such as a polyurethane, electrically conductive filler particles, silver-plated filler particles and solvent.