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Multiwalled carbon nanotubes(CNTs) were coated by a molybdenum layer using carbonyl thermal decomposition process with a precursor of molybdenum hexacarbonyl.The Mo-coated CNTs(Mo-CNTs) were added into copper powders to fabricate Mo-CNT/Cu composites by means of mechanical milling followed by spark plasma sintering.The Mo-CNTs were uniform dispersion in the Cu matrix when their contents were 2.5 vol.%-7.5 vol.%,while some Mo-CNT clusters were clearly observed at additions of 10.0 vol.%-15.0 vol.% Mo-CNTs in the mixture.The mechanical,electrical,and thermal properties of the Mo-CNT/Cu composites were characterized,and the results showed that the tensile strength and hardness were 2.0 and 2.2 times higher than those of CNT-free specimens,respectively.Moreover,the Mo-CNT/Cu composites exhibited an enhanced thermal conductivity but inferior electrical conductivity compared with sintered pure Cu.The uncoated CNT/Cu composites were fabricated by the similar processes,and the measured tensile strength,hardness,thermal conductivity,and electrical conductivity of the CNT/Cu composites were lower than those of the Mo-CNT/Cu composites.
Multiwalled carbon nanotubes (CNTs) were coated by a molybdenum layer using carbonyl thermal decomposition process with a precursor of molybdenum hexacarbonyl. Mo-coated CNTs (Mo-CNTs) were added into copper powders to fabricate Mo-CNT / Cu composites by means of Mo - CNTs were uniformly dispersed in the Cu matrix when their contents were 2.5 vol.% - 7.5 vol.%, while some Mo-CNT clusters were clearly observed at additions of 10.0 vol.% - Mo-CNTs in the mixture. Mechanical, electrical, and thermal properties of the Mo-CNT / Cu composites were characterized, and the results showed that the tensile strength and hardness were 2.0 and 2.2 times higher than those of CNTs -free specimens, respectively. Moreover, the Mo-CNT / Cu composites exhibited an enhanced thermal conductivity but inferior electrical conductivity compared with sintered pure Cu. uncoated CNT / Cu composites were fabricated by the similar processes, and the measured tensile strength, hardness, thermal conductivity, and electrical conductivity of the CNT / Cu composites were lower than those of the Mo-CNT / Cu composites.