Parameter Characterization in Processing of Silver – Aluminum Based Electrical Contact Materials

Abstract

An electrical contractor is one which plays significant role in day todays life in industries as well as in home appliances. In current scenario the materials for conducting purpose has an overwhelming research capability. Now a day the silver based electrical contact composite material have provided the potential applications in aerospace and automobile industries. Among silver based contact material the silver cadmium oxide and silver tin oxide plays a vital role in fabrication of electrical contactors. In this research an attempt has been made to study the influence of adding Aluminum with silver based electrical contact composite materials by two different processing routes namely stir-casting and powder metallurgy. Silver and aluminum matrix plays a virtual role in composite world owing to their highest conductivity. Optimum parameters were identified for attaining the maximum properties such as conductivity, hardness, density, and porosity of composition. By this better conducting property and mechanical property of the electrical contact can be improved by this system. Thus a screening test has be conducted with addition of Al with silver tin oxide compositions hence this paper aims to process the aluminum -silver based electrical contact materials by stir casting processing and powder metallurgy route and compare the results obtained.

Fabrication and Arc Erosion Behavior of Ag-SnO2-ZnO Electrical Contact Materials

“…When the results obtained were analyzed, it could be established that the microhardness reached by Ag-ZnO-SnO 2 composites was higher than that of the commercial Ag-CdO/Ag-SnO 2 /Ag-ZnO materials (<110 HV) [ 51 , 52 , 53 , 54 ]. This would be mainly due to the fine and homogeneous distribution of oxides produced during the milling process ( Figure 7 ).…”

Influence of Heat Treatment Condition on the Microstructure, Microhardness and Corrosion Resistance of Ag-Sn-In-Ni-Te Alloy Wire

“…This is attributed to the aggregation of SnO 2 particles on the contact surface over extended periods of use; this is a consequence of the limited wettability between SnO 2 and Ag. During the past decade, various nonmetals, metals or metallic oxides—including N [ 21 ], F [ 22 ], Cr [ 7 ], Ni [ 21 ], Cu [ 23 ], Y [ 24 ], Bi [ 25 ], La [ 26 ], Ce [ 27 ], Gd [ 28 ], CuO [ 29 ], Cu 2 O [ 30 ], NiO [ 31 ], ZnO [ 32 ], TiO 2 [ 33 ], WO 3 [ 34 ], Bi 2 O 3 [ 33 ], In 2 O 3 [ 35 ] and La 2 O 3 [ 36 ]—have been employed as additives to enhance the anti-arc erosion behavior, mechanical properties and conductivity of AgSnO 2 contact material. Among these additives, the addition of In 2 O 3 demonstrated remarkable enhancements in the ultimate strength and elasticity moduli of AgSnO 2 contact materials, along with improvements in cyclic creep behavior.…”

Evolution of Interface Microstructure and Tensile Properties of AgPd30/CuNi18Zn26 Bilayer Laminated Composite Manufactured by Rolling and Annealing

“…Silver is the most electrically conductive element in the periodic table and the cheapest precious metal, and thereby an ideal electrical contact material. However, silver is soft, has poor resistance to arc (due to the low melting point) and is apt to corrode in a sulfide atmosphere, thus, some other elements and compounds are added to improve its contact performance [2][3][4][5][6][7]. The properties of Ag-Pd alloys are well known to be suitable for sliding contact components, such as brushes [8].…”