[Zurück]

E. Neubauer, I. Smid, G. Kladler, G. Korb, C. Eisenmenger-Sittner, H. Bangert:
"The Influence of Alloying Elements (Cr and Ti) on the Thermal and Mechanical Characteristics of Copper-Carbon Composites based on Coated Carbon Fibers";
Vortrag: PM2TEC 2003, Las Vegas/USA; 09.06.2003 - 12.06.2003.

One method for the preparation of copper carbon composites is based on a powder metallurgical approach. When copper is electrochemically deposited on short carbon fibers, a very good distribution of fibers is guaranteed. However, due to a weak interface in the composite the theoretical thermal conductivity is not achieved.

Based on experiments on plane coated carbon substrates, which showed that Cr or Ti diffuses through copper layers at 800°C, composites based on copper coated carbon fibers were prepared by admixing of different amounts of Cr or Ti (<1at%) to the coated fibers. For consolidation hot pressing and hot isostatic pressing was used. It was confirmed by SEM and EDX that in the final composite the alloying element was found in the interface region. Thermal diffusivity measurements showed that there is a positive influence of the alloying elements. Additionally the influence on mechanical properties was investigated.