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InCd Alloy
Indium-Cadmium (InCd) Alloy
A low-temperature solder alloy combining indium's ductility with cadmium's strength and thermal performance for specialized applications.
The InCd alloy is engineered for applications where controlled thermal processing and reliable performance are crucial. Typically composed of approximately 65% indium and 35% cadmium, it exhibits a melting point of around 140°C, with balanced electrical resistivity and thermal conductivity ideal for precision interconnects and industrial applications.
| Property | Value | Notes |
|---|---|---|
| Composition | In ~65%, Cd ~35% | Binary eutectic ratio for optimal solder performance |
| Melting Point | ~140°C | Low enough for temperature-sensitive assemblies |
| Electrical Resistivity | ~28 µΩ·cm | Provides balanced conductivity |
| Thermal Conductivity | ~45 W/m·K | Facilitates efficient heat dissipation |
| Mechanical Strength | ~7 MPa | Offers adequate strength for critical interconnects |
Conceptual 3D Microstructure
A simplified 3D model representing alternating eutectic layers of indium and cadmium.
Applications
Low-Temperature Soldering
Minimizes thermal stress on delicate substrates.
Flexible Electronics
Ideal for bendable devices and wearables.
Precision Interconnects
Ensures reliable electrical connections in high-performance circuits.
Industrial Applications
Suitable for robust assemblies where thermal performance is critical.
Element Breakdown
Symbol: In
Atomic Number: 49
Key Role in InCd: Provides ductility and lowers the melting point.
Fun Fact: Indium is essential for forming reliable low-temp solder joints.
Symbol: Cd
Atomic Number: 48
Key Role in InCd: Enhances mechanical strength and thermal conductivity, though requires careful handling due to toxicity.
Fun Fact: Cadmium usage is tightly regulated because of its toxicity.
Performance Comparison: Melting Point
Comparison of melting points among popular solder alloys. The InCd alloy's ~140°C melting point enables low-temp processing with robust performance.
Advantages Over Traditional Solders
| Property | 63Pb/37Sn (Lead-Based) | SAC (Lead-Free) | InPb | InCd Alloy | Bi-Sn |
|---|---|---|---|---|---|
| Melting Point (°C) | 183 | 217 | 125 | 140 | 138 |
| Electrical Resistivity (µΩ·cm) | 20 | 15 | 30 | 28 | -- |
| Thermal Conductivity (W/m·K) | 35 | 60 | 40 | 45 | -- |
| Mechanical Strength (MPa) | 26 | 40 | 6 | 7 | -- |
Manufacturing & Production
The InCd alloy is produced by melting high-purity indium and cadmium under controlled conditions to achieve the eutectic composition. Its melting point of around 140°C reduces energy usage and thermal stress during soldering, making it ideal for precision interconnects and industrial applications.
Safety & Handling
- Molten InCd must be handled with proper protective gear to avoid burns.
- Work in well-ventilated areas and follow strict environmental guidelines due to cadmium toxicity.
- Recycle materials responsibly because of the scarcity of indium and cadmium regulations.