Bismuth tin alloy is a blend of bismuth metal and tin metal, which are available with many different ratio, as 60:40, 58:42, 50:50 and so on. Their melting point is relatively low, so it is known as fusible alloy, Wood’s metal. Bismuth lead, bismuth aluminum, bismuth antimony, bismuth indium are also available. They are customs according to clients’ requirements.
Bismuth tin alloy is widely recognized for its low melting point, non-toxic composition, and ease of use, making it an ideal material for low-temperature soldering, thermal management, and various specialty applications. The unique properties of bismuth tin alloy, including its environmentally friendly composition and excellent bonding capability, have led to its adoption in sectors such as electronics, automotive, medical, and aerospace manufacturing.
Bismuth Tin Alloy
BiSn alloy is environment friendly, which has strong permeability. Low melting BiSn mould alloy apply to make sheet cold stamping die. It is also for production of copper sheet, aluminum sheet, steel plate and corrosion resistant plate. The mould is for stretching, bending and molding of sheet.
BiSn alloy uses as safety plug of fire protecting arrange, automatic sprinkler and boiler. Once fire happen, plunger of the tubes will melt down and spray water.
In fire control and electrical industry, it use as automatic fire extinguishing system and electric fuse, soldering tin. Bismuth alloy has no shrinkage character when solidification.
Applications
One of the primary applications of bismuth tin alloy is as a low-temperature solder in electronics manufacturing. With a melting point significantly lower than traditional lead-based solders, BiSn alloy is used in the assembly of sensitive electronic components that could be damaged by high-temperature processes. This alloy’s non-toxic, lead-free nature makes it a safer choice for manufacturers and end-users, especially in consumer electronics like smartphones, computers, and other high-precision devices.
Bismuth tin alloy is also valuable in thermal management applications. Thanks to its thermal conductivity, the alloy is used as a thermal interface material (TIM) to enhance heat dissipation in electronic devices, especially in systems that must operate at controlled temperatures to avoid overheating. In power electronics, automotive systems, and advanced computing, BiSn alloy TIMs contribute to longer-lasting, more efficient devices by efficiently transferring and dissipating heat.
The medical and aerospace sectors also benefit from bismuth tin alloy’s properties. Its low melting point allows it to be used in safety devices, such as thermal fuses and actuators, where controlled melting can be critical in emergency systems. Additionally, BiSn alloy is used in casting and prototyping due to its smooth surface finish and dimensional stability, allowing for precision modeling in medical and aerospace components.