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New WAg electrical contacts with ultrafine structure for low voltage devices

S. GAVRILIU1,* , M. LUNGU1, M. LUCACI1, E. ENESCU1

Affiliation

  1. INCDIE ICPE-CA – National Institute for Research and Development in Electrical Engineering, 313 Splaiul Unirii, 030138 Bucharest-3, Romania

Abstract

The paper presents the research results concerning the obtaining of a new type of WAg sintered electrical contacts with a high silver content for safety switches working in air up to 500 A. The applied method is based on powder metalurgy techniques. This method starts with powder mixtures manufacturing by chemical coprecipitation of AgWO4 from aqueous solutions, the precipitate processing by reducing in a H2 stream to a very homogenous and fine dispersed WAg powder mixture and final electrical contact pieces obtaining by pressing, sintering and reshaping. The technological parameters, as well as to the characterization of the obtained powders and sintered electrical contacts are presented. The new electrical contacts present a very fine microstructure, and as a result, they have some improved physical, mechanical, electrical and functional characteristics..

Keywords

Fine microstructure, Tungsten silver, Electrical contacts.

Submitted at: Jan. 18, 2006
Accepted at: March 23, 2006

Citation

S. GAVRILIU, M. LUNGU, M. LUCACI, E. ENESCU, New WAg electrical contacts with ultrafine structure for low voltage devices, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 2, pp. 702-707 (2006)