Durable plating for electrical contact terminals

Details Durable plating for electrical contact terminals Durable plating for electrical contact terminals

1990-09-10

1992-07-14

Paumen, Gary F.

Metal working

Method of mechanical manufacture

Electrical device making

439886, H01R 1303

Patent

active

051291436

ABSTRACT:
Electrical contact terminals having two layer plated coating thereon is disclosed. The coating consists of a layer of palladium having a macrostress in the range of 30,000 to 140,000 psi and a layer of gold, the gold being at lest 99.9% pure and having a Knoop hardness from 60 to 90. A coating comprised of medium stress palladium and gold substantially and unexpectedly inmproves the durability of terminals as compared to similar coatings using gold and low or high stress palladium.

REFERENCES:
patent: 1904241 (1933-04-01), Kammerer
patent: 2846649 (1958-08-01), Hornauer
patent: 2897584 (1959-08-01), Schumpelt
patent: 4138604 (1979-02-01), Harmsen et al.
Characteristics of Palladium Gold Sliding Contact for Connectors I. Andoh et al, IEEE, CHI781,-Apr. 1982.
Friction Properties of Palladium-Gold Multilayer Contacts Takehiko Sato et al, Fujitsu Sci. Tech. J., 18, Mar. 1, 1982, pp. 83-100.
Palladium With A Thin Gold Layer As A Sliding Contact Material Sato et al, IEEE Transactions vol. CHMT-4 No. 1, Mar. 1981, pp. 10-14.

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