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A new type of silver rare-earth alloy contact material AgSnO2-La2O3-Bi2O3 is obtained through using a Powder Metallurgy Process. Its preparation process is cold pressing sintering re-pressure and the mixing ratio is Ag: SnO2: La2O3: Bi2O3 = 88.7:3.5:1.5. The parameters are chosen as follows: molding pressure is 10 ~ 40t, sintering temperature is 800 ~ 920°C, holding time is 2~8h, re-press pressure...
For electrical contacts, the liquid bridge phenomena depends on the thermal conditions. The relationship between the thermal condition and bridge phenomena is still not clear yet. Therefore, it is necessary to discuss the relationship between the thermal condition and shape of the bridge. In this paper, to clarify the relationship between the thermal condition and bridge shape (length and diameter),...
The contact resistance and wear behavior of conducting contact surfaces is a function of hardness, applied load and material constituents. This paper presents mechanical and material properties of conducting alloys fabricated as functionally graded metal matrix composites (MMCs); in particular copper/tungsten, copper/tungsten carbide, and bronze/tungsten-carbide. Tungsten and in particular tungsten-carbide...
It is very important to predict the force-contact resistance relation for the virtual connector designing. In this study, the prediction of electrical contact resistance in various cases was examined. The specimens consisted of a copper alloy with tin or silver plating. To predict the contact resistance at each contact force, the relationship between contact resistance and contact force were separated...
The impact of spot size and location within a contact zone was evaluated using two different formulations provided by Greenwood and the present author respectively. It was seen that significant variation in current density across the contact region suggests, that as a contact degrades, there will be a non uniform degradation and failure of the contact spots as aging progresses. This is thought to...
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