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The effect of graphite additions on the performance of silver-nickel contacts

Content Provider	IEEE Xplore Digital Library
Author	Wingert, P. Bevington, R. Horn, G.
Copyright Year	1990
Description	Author affiliation: Adv. Metall. Inc., McKeesport, PA, USA (Wingert, P.; Bevington, R.; Horn, G.)
Abstract	Silver-nickel 90/10 contacts with 0, 0.5, and 1.0 wt.% graphite additions were evaluated for their electrical switching performance. Powder metallurgically produced sample contacts were subjected to static gap tests. 200 A weld tests, and endurance tests at 100 A AC, in a commercial relay. The addition of graphite to silver-nickel 90/10 reduced the maximum weld strengths with increasing graphite content for fixed arc energy. Material loss due to arc erosion is less for 0.5% graphite addition than for the 1% C addition. This seemed to be a result of the greater arc intensity with increased graphite percentage. The formation of large nickel articles and the oxidation of nickel are the microstructural changes observed near the contact surfaces as a result of the arcing. The graphite addition influenced the extent to which these transformations had occurred.<>
Starting Page	524
Ending Page	529
File Size	1136460
Page Count	6
File Format	PDF
DOI	10.1109/HOLM.1990.113053
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1990-08-20
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Welding Nickel Silver Powders Contact resistance Switches Materials testing Relays Surface morphology Surface resistance
Content Type	Text
Resource Type	Article

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