EXPERIMENTAL INVESTIGATIONS ON PROPERTIES OF COPPER – SILICA FUME PARTICULATE COMPOSITES
Keywords:
Density, Porosity, Hardness, Strength, Electrical conductivityAbstract
Copper-silica fume mixtures containing 0-15 wt% silica fume were prepared. Small cylindrical specimens of 9 mm diameter and 10.5 mm length were fabricated at 300 MPa using single acting die compaction at ambient temperature. These compacts were sintered in argon atmosphere for a period of 45 min at 8500C. The physical and mechanical properties of green and sintered compacts were determined as a function of silica fume weight percent. It was observed that green density and strength decreased, while green porosity and hardness increased with increasing weight percent of silica fume. Sintering resulted in decrease in volume and increase in density of green compacts. It was further observed that addition of silica fume resulted in increase in porosity and hardness and decrease in density and compressive yield strength of sintered compacts under the present experimental conditions. Electrical conductivity of sintered copper-silica fume compacts was also determined as a function of silica fume content. The electrical conductivity gradually decreased with increase in silica fume content.
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