Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2010 - zeszyt 3

AgSnBi consolidated by cyclic extrusion compression

nr katalogowy: 52724

Electrical contact materials are used in a variety of applications, such as electrical switches, contractors, circuit breakers, voltage regulators, arcing tips, switch gears and relays. Contact performance typically regards the three major functions of the switch and their respective set of dependent variables. During contact operation, a low tendency for contact welding and a low erosion rate are required. The toxic nature of lead and the increasing awareness of its adverse effect on environment and health have led to the development of lead-free alloys in recent years. A candidate lead-free electric contact alloys must fulfill some requirements: suitable melting temperature and solidification behavior, good wettability, excellent mechanical properties and very good conductivity, resistance against wear [1÷3]. The Ag-Bi-Sn alloy is a promising lead-free alloy because it is superior to other candidates with respect to melting, wettability and mechanical properties [4, 5]. Internal oxidation of Ag-Sn alloy is important to prepare Ag-SnO2 electrical contact materials [6]. This process of reaction diffusion of Ag-Sn-Cu consists of a few stages. It mainly includes three stages: the first process is the adsorption and decomposition of oxygen at the surface; the second one is oxidizing reaction to form SnO2 particles and oxide band; the third one is diffusion of Cu and CuO formation. Being pollution-free, silver tin oxide (Ag/SnO2) has been used to replace toxic Ag/CdO contact materials in last two decades. In terms of replacing cancerous Ag-CdO, as well as reducing material and process cost, an attempt has been made to synthesize Ag-Sn-Bi tertiary system as a new way of production of materials for the electric contacts [3÷5]. The purpose of this paper is to investigate hardness and microstructure of Ag-Sn-Bi contact material fabricated by powder metallurgy and then consolidation by special Cyclic Extrusion Compression method [7]. [...]

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