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New Ag-SnO2-MeO ecological advanced materials for electrical contacts used in electromagnetic contactors

Domenii publicaţii > Stiinte ingineresti + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: M. Lungu, S. Gavriliu, S. Nitu, T. Canta, D. Sin, P. Budrugeac, D. Patroi

Editorial: J. Optoel. Adv. Mater, 10(5), p.1064-1068, 2008.

Rezumat:

The paper presents the research results about the achievement and characterization of some new Ag-SnO2-MeO (MeO = Bi2O3 and CuO) ecological electrical contact materials as substitutes of the toxic and carcinogenic Ag-CdO ones. The new materials were obtained from very fine and uniform Ag-SnO2 chemical powders mixtures doped with MeO. These were realized by a wet way, in an AgNO3 aqueous solution containing SnO2 and MeO particles in suspension, by Ag precipitation „in situ” with a Na2CO3.10H2O aqueous solution. The obtained mixtures were filtered, washed, dried, calcined to the desired final composition, washed again to remove the impurities and dried. Then these were processed by powder metallurgy techniques in form of electrical contact pieces fitted in AC electromagnetic contactors working in air at Ith = 125 A and In = 107 A. The materials were characterized from the physical, mechanical, electrical, microstructural and functional points of view.

Cuvinte cheie: ecological materials, electrical contacts