Alloy substitute for mercury in switch applications

Details Alloy substitute for mercury in switch applications Alloy substitute for mercury in switch applications

1993-02-25

1995-02-21

Luebke, Renee S.

Electricity: circuit makers and breakers

Liquid contact

Particular conductive liquid

H01H 2906

Patent

active

053918460

ABSTRACT:
With proper handling, Gallium-Indium-Tin eutectics are suitable for use as a substitute for mercury in switch applications. The eutectics should be acid washed to prevent oxidation of the metal components of the eutectic while in the switch housing and, further, the switch housing should be filled with an inert gas. Preventing oxidation ensures long term performance of the switch. In addition, provisions need to be made to prevent wetting of the switch housing by the eutectic. Experiments have shown that acid washing of metallic switch housings prior to adding the Gallium-Indium-Tin eutectic reduces or eliminates wetting by the eutectic. In addition, experiments have shown that coating the walls of the switch housing with a fluoropolymer coating prevents wetting by the eutectic.

REFERENCES:
patent: 3462573 (1969-08-01), Rabinowitz et al.
patent: 5021618 (1991-06-01), Ubukata et al.

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