PREPARATION AND SINTERING OF W-۲۰%Wt Cu COMPOSITE POWDERS PRODUCED BY CO-PRECIPITATION METHOD

Abstract: materials can be fabricated by sintering of W-Cu composite powders. In this research W-۲۰%wt Cu composite powderswas synthesized via a co-precipitation method. Precipitate obtained from a mixture of copper nitrate and ammoniumparatungstate (APT) in distilled water contained W-Cu compounds. This precipitate was washed, dried and calcinedat ۵۵۰ of dried precipitate powder was determined by thermogravimetry (TG), differential thermal analysis (DTA) and X-raydiffraction (XRD). The sintering of the reduced powders was investigated as a function of temperature. Relative densityof more than ۹۸% obtained for the powders sintered at ۱۲۰۰close to theoretical calculations. The hardness of the sintered powders was ۳۲۰ Vickers.W-Cu composites are widely used as contacts, heat sinks and electro discharge electrodes. These kinds of°C in air and then reduced in H۲ atmosphere in order to convert to W-Cu powders. The calcination temperature°C . The corresponding electrical conductivity was too

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Keywords: W-Cu composites ، Co-precipitation ، Thermal analysis.