Fusible Alloy Material

Wood’s metal is a typical fusible alloy, composed of bismuth (50%), lead (25%), tin (13%), and cadmium (12%) fused in proportion. It is named after the 19th – century British scientist Brazet Wood. Its melting point is approximately 70℃, which is lower than the boiling point of water. In its liquid state, it has strong fluidity, and when solidifying, it has little volume shrinkage. At room temperature, it has moderate strength, but it softens easily at high temperatures. In traditional applications, Wood’s metal is often used to make circuit fuses and the thermal – sensitive elements of fire sprinkler heads (which melt at around 74℃ to trigger action). It can also be used as a temporary mold material for precision casting. After heating, it is easy to demold without damaging the workpiece. Due to the presence of toxic metals such as lead and cadmium, cadmium – free and environmentally – friendly formulations have been gradually developed in modern times (for example, zinc is used to replace part of the cadmium). However, its “low – melting – point trigger” characteristic remains a key functional material in the fields of industrial safety and precision manufacturing.

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Discover the Extraordinary Properties of Eutectic Alloys

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