Apparatus including electrical contacts

Details Apparatus including electrical contacts Apparatus including electrical contacts

1989-02-01

1990-01-02

Luebke, Renee S.

Electricity: circuit makers and breakers

Electric switch details

Contact

200269, H01H 102

Patent

active

048914800

ABSTRACT:
An electrical device is provided which has contacts having regions with a conductive matte-finish metal surface. The matte-finish surface is characterized by having a Knoop hardness number of at least 300, a diffuse reflectance of less than about 20 percent, and a specular reflectance of less than about 2 percent. These contacts have a contact resistance of less than about 50 milliohms, under a 50-gram load, even after exposure to 50.degree. C. and 95% relative humidity for a period of 20 days. Reflection electron microscopy shows that particularly advantageous matte-finish surfaces have sharply peaked asperities with average peak angles of less than about 90 degrees. In one embodiment, the surface is formed of hardened nickel electroplated from an electrolytic bath with a pH above about 7.0.

REFERENCES:
patent: 4430635 (1984-02-01), Sacchetti
patent: 4503131 (1985-03-01), Baudrand

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