Nanosized Cu/SiC-powders were produced in a thermal radio frequency plasma reactor. A mixture of conventional Cu and SiC powders with particle sizes of about 10 μm were used as precursor. After the evaporation and quenching process in the plasma reactor, Cu/SiC composite powders with typical particle sizes below 40 nm were collected in the filter systems. The SiC content of the produced powders was varied between 0 and more than 50vol%. Due to the handling of the powders in air, relatively high oxygen contents were found. The powders were densified by pressure assisted sintering techniques (Hot Isostatic Pressing, HIP). For comparison also mixtures of conventional Cu and conventional SiC powders were hot isostatically pressed. The results of density measurements reveal the influence of temperature, grain size, and amount of SiC on the densification of Cu/SiC composite powders. An increasing amount of SiC led to decreasing final densities. Additionally, the influence of the SiC dispersions on the final grain size of the Cu/SiC composites produced from Cu/SiC composite powers was studied. In the case of Cu/SiC composite powders hot pressing was performed in Ar/4%H 2 and the influence of the reducing atmosphere on the oxygen content in the specimens was investigated. Vickers hardness measurements were used as a first mechanical test of the different produced composites. These measurements indicate the influence of both the SiC dispersions and the grain size of the composites on hardness.