NDLI: Tungsten and tungsten carbide based contact materials used in low voltage vacuum contactors

Content Provider	IEEE Xplore Digital Library
Author	Behrens, V. Honig, T. Kraus, A.
Copyright Year	1999
Description	Author affiliation: AMI DODUCO GmbH, Pforzheim, Germany (Behrens, V.)
Abstract	By means of a single phase vacuum model switch with a current range from 50 A (for current chopping) to 1500 A (for AC4 contact erosion) contact materials of the group of tungsten carbide/silver, tungsten carbide/copper and tungsten/copper are evaluated. The properties focused on are current chopping in new state as well as during service life, contact erosion due to AC4 life due to cracking and reignition behavior. It is found that in regard to current chopping best results are obtained with WC/Ag and WC/Cu, while W/Cu and even an optimized W/Cu having antimony additives show substantially higher chopping currents. In regard to AC4 life and especially to reignitions the copper containing materials were found to be superior to the silver containing materials. In the case of WC/Cu there are indications of poor contact resistance during service life which is attributed to the evaporation of the copper from the arc treated area in combination with a poor wetting behavior of the molten copper to the WC particles.
Starting Page	105
Ending Page	110
File Size	424401
Page Count	6
File Format	PDF
ISBN	0780355490
DOI	10.1109/HOLM.1999.795934
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1999-10-04
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Tungsten Low voltage Contactors Copper Contacts Silver Optical wavelength conversion Additives Ambient intelligence Switches
Content Type	Text
Resource Type	Article

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