Soldering without heating. Free Technical Library News

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Soldering without heating

22.03.2016

Soldering is the most common way to repair various electronic parts, and now scientists from the University of Iowa (USA) have developed a way to perform this operation without heating.

The cold soldering method uses a paste of supercooled liquid metal droplets that is applied and activated by mechanical rubbing.

Three alloys were used to create the solder: gallium-bismuth with a melting point of about 16 °C, bismuth-indium-tin with a melting point of 62 °C, and bismuth-tin with a melting temperature of 139 °C. Small pieces of metal were placed in small vessels filled with acetic acid solution and then heated. After melting, the metal was crushed into small pieces ranging in size from four nanometers to five micrometers.

Thanks to the acid, the metal was covered with a shell of oxides and the resulting balls did not stick back together. A further decrease in temperature led to the effect of hypothermia.

In order to use such a metal paste for soldering, it is enough to mechanically destroy the shell of the balls. The metal flows out of them and solidifies, finding a crystallization center on two objects that need to be fastened together.

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