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Electrical Conductivity of Spark Plasma Sintered W-Cu and Mo-Cu Composites for Electrical Contact Applications

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Document pages: 13 pages

Abstract: Tungsten copper and molybdenum copper composites were prepared by spark plasma sintering (SPS). The weight percentage of copper is between 20 and 40 . Other samples with similar compositions were also developed using the traditional techniques of liquid phase sintering (LPS) and infiltration. The conductivity measurement shows that the conductivity level of the samples prepared by SPS process is significantly higher than that prepared by other methods. The relative density measurement shows that the SPS sample has reached a very high density, and the relative density is between 99.1 - 100 . On the other hand, the relative densities of LPS and permeated samples were 88 - 92 and 96 - 98 , respectivelyy. The superior conductivity of the SPS specimens has been attributed to the virtually full densification achieved by the process. The effect of porosity on electrical conductivity has been discussed and three standard models were assessed using results from porous sintered skeletons of pure tungsten and pure molybdenum.

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