The activated sintering of W-Cu composites through spark plasma sintering

摘要

Tungsten-copper composites of network structure are increasingly being studied because of their unique mechanical, thermal and electrical properties. Chemical plating and mechanical alloying were used to prepare tungsten-copper alloys with different compositions in this investigation. Samples obtained through mechanical alloying method and sintered by spark plasma sintering (SPS) technique at 1030 degrees C, 60 MPa exhibited excellent performance. Ni element and Cr element were added to the composite as activating elements to improve the interface wettability of tungsten-copper. The experimental results showed the Cr element contributes more to the densities, tensile strength, flexural strength and thermal properties of the composites than Ni element. Besides, the effect of two different ball milling ways on the properties of the composites was also studied. The sample W-20Cu (15Cr), which was prepared by Cu(Cr) ball milling, showing a network structure, has the best performance.