Microstructure and Microhardness of Conical-Shaped W-Cu Composites Prepared by Spark Plasma Sintering and Subsequent Spinning Process

In this study, we present some results on the preparation of a conical-shaped W-Cu composite by using the combination of the spark plasma sintering and subsequent spinning process. The experimental results demonstrated that the full density, fine grain and high hardness composite could be obtained. The relative density of the W-Cu composite after the spinning process increased up to 99.8% which is higher than that of the composite prepared by SPS processing (98.8%). Similarly, the microhardness of the composite after the spinning process is improved compared to the sample obtained after SPS processing. This was attributed to the grain size refinement and the increase of the dislocation density generated during the spinning process. Besides, the dependence of the microstructure and microhardness of the conical-shaped W-Cu composite on the positions of the cone was investigated in detail. As a result, the microstructure and microhardness of the cone were altered at various locations from the inside to the outside walls. This could be attributed to the difference in the interface bond strength between W and Cu matrix at different positions. The current work promises to be an innovative and encouraging approach to producing high-performance W-Cu composites for possible industrial applications and specially in shaped charge liners.