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PS soldering process
PS is the abbreviation for pressure soldering. This method of soldering, developed by Tokuda, Chiba and Mizuishi at the Hitachi Research Center, offers two main advantages: (1) no flux is needed; (2) pore formation is excluded. It is best explained using the example of a silicon pellet which is soldered to a substrate (see figure). The contact surface was previously metallized for this purpose.
If the volume and temperature values measured inside the solder preform at the time of executing steps (2) and (4) are represented as V1, V2 and T1 ,T2 it follows from the Boyle-Charles’ law: