Synthesis process and microstructure of carbon fibres/graphite/copper composites by spark plasma sintering

Carbon fibres/graphite/copper composites are prepared by mechanical alloying and spark plasma sintering at different temperature in this study, and the microstructure evolution is investigated during sintering. The curves of punch displacement, mould temperature, furnace chamber vacuum, and voltage against time were recorded and discussed. The results show that the carbon fibre/graphite/copper composite presents neat and pure interface. Copper element is found in carbon fibres and graphite, which may be due to discharge. The microhardness of the obtained composites is up to 160 HV. The highest relative density in this test is 96.5%. The microstructure evolution process during SPS is associated with sparking, joule heat, pressure, and deformation. The sintering process is uneven at initial stage.