Indium/Silver alloy (In97/Ag3) combines the softness and low melting point of indium with the high conductivity and corrosion resistance of silver. This unique blend produces a material prized for its use in joining, electronic, and cryogenic applications where excellent thermal and electrical contact are required.
Material Overview
Composed of approximately 97% indium and 3% silver, this alloy forms a solid solution with a face-centered cubic (FCC) crystal structure influenced by the indium matrix. The addition of silver improves the mechanical strength and thermal stability of pure indium without significantly altering its low melting point of around 155°C. The alloy retains indium’s exceptional ductility, malleability, and ability to wet a wide variety of metallic and ceramic surfaces.
Indium/Silver alloys demonstrate moderate electrical resistivity (around 8×10−8 Ω·m) and high thermal conductivity, making them ideal for applications requiring efficient heat dissipation. Their corrosion resistance is particularly advantageous in humid or chemically reactive environments, where pure indium might otherwise degrade over time.
Applications and Advantages
In97/Ag3 is widely used in soldering and bonding applications, particularly where low-temperature joining is essential. Typical uses include sealing infrared detectors, fabricating semiconductor devices, and assembling cryogenic equipment. The alloy’s excellent creep resistance and hermetic sealing capability make it suitable for vacuum and aerospace systems. Moreover, the silver addition reduces oxidation during processing, leading to cleaner, more durable joints.
In precision electronics, this alloy provides stable electrical contacts and is often employed in thin-film deposition or bonding layers for high-reliability assemblies. Its combination of conductivity, pliability, and resistance to fatigue under cyclic temperature conditions makes it a versatile and high-performance joining material.
Goodfellow Availability
Goodfellow supplies Indium/Silver (In97/Ag3) alloy in a variety of high-purity forms suited to both research and production environments. Materials can be customized for specific dimensional, purity, or form requirements, ensuring compatibility with demanding thermal and electronic systems.
Explore Indium/Silver (In97/Ag3) and other advanced materials in Goodfellow’s online catalogue: Goodfellow product finder.
References
- Massalski, T. B. (Ed.). (1990). Binary Alloy Phase Diagrams (2nd ed.). ASM International.
- Patterson, R. A., & Harris, J. W. (2018). Low-temperature soldering and bonding materials. Journal of Materials Engineering and Performance, 27(5), 2271–2280.
- Okamoto, H. (2016). In-Ag (Indium–Silver). Journal of Phase Equilibria and Diffusion, 37(1), 93–94.