Stationary loading, fretting and sliding of silver coated copper contacts: Influence of corrosion films and corrosive atmosphere
1997 (English)In: Tribology International, ISSN 0301-679X, Vol. 30, no 3, 165-175 p.Article in journal (Refereed) Published
The degradation mechanisms of silver coated copper contacts were studied under stationary loading, reciprocated sliding and fretting conditions. The model contact consisted of two crossed cylinders (Ø = 10 mm) mounted in a small test chamber. Prior to performance testing corrosion films were grown in a large chamber of Battelle class III atmosphere. The tests were performed in four atmospheres, specified with respect to temperature, relative humidity and pollutant gases. The normal force was 20 or 60 N and the contacts were powered with a direct current of 10 A. The study shows that the presence of a thin pre-grown corrosion film on top of the silver coating strongly influences the contact resistance, the friction and the degradation mechanisms of the contact. Generally, the corrosion films reduced the tendencies to adhesion between the contact surfaces, which subsequently reduced the deformation. Moreover, the corrosion films had very different effects in different contact situations. While the impairing effect on the contact resistance was almost neutralized during fretting it was substantial in some sliding cases. In contrast to the pre-grown corrosion film, the test atmosphere was not found to influence the contact performance.
Place, publisher, year, edition, pages
1997. Vol. 30, no 3, 165-175 p.
electrical contacts, silver coated copper, fretting, wear, corrosion films, corrosive atmosphere
Engineering and Technology
IdentifiersURN: urn:nbn:se:uu:diva-28429DOI: 10.1016/S0301-679X(96)00031-XOAI: oai:DiVA.org:uu-28429DiVA: diva2:56325