K. Konig et al. Joumal of the European Ceramic Sociery 30(2010)1131-1137 Fig. 5.(a and b) SEM micrograph of the fracture surface of a CNT-coated SiC fibre after SiC deposition by electrophoresis at two different magnifications 3.2. Electrophoretic deposition of carbon nanotubes on per A solid CNT-coating was also formed on a graphite anode metallic electrodes and SiC-fibres at 2.8 V in 5 min From the higher magnification image in Fig. 3. it is evident that the CNTs form a fairly uniform coating and that The EPD experiments were first performed using a CNt- they are evenly distributed on the graphite electrode suspension with a solids content of 0.5 wt %, on steel, copper, In further EPD experiments, the Sic fibre mats were attached or graphite electrodes. Due to the negative ZPof CNTs in suspen- to the front side of the anode and were coated with a layer of sion, the deposits were always formed on the anode. Initially we CNTs at an applied voltage of 2.8 V for 10 min. In these exper performed an EPD experiment on a steel electrode At voltages iments, the SiC fabric was in contact with the anode so that it gher than 2. 8 V, the electrolysis of water apparently limited the acted itself as the electrode. a similar result could be obtained deposition, whereas at lower voltages, no deposit of carbon nan- by using the fibre mat directly as an electrode, as shown else- otubes was observed after 10 min. With a copper electrode, the where on the SiC/mullite system, however, due to the lower bubble formation was suppressed due to the oxidation of cop- conductivity of the SiC fibres compared with a metal electrode, Sic fabric anode teflon cover Fig. 6. Schematic representation of the EPD cell used for infiltration of SiC fibre fabric with SiC particles:(a)SiC-fabric is in contact with the electrode and(b) SiC-fabric is not in contact with the electr1134 K. König et al. / Journal of the European Ceramic Society 30 (2010) 1131–1137 Fig. 5. (a and b) SEM micrograph of the fracture surface of a CNT-coated SiC fibre after SiC deposition by electrophoresis at two different magnifications. 3.2. Electrophoretic deposition of carbon nanotubes on metallic electrodes and SiC-fibres The EPD experiments were first performed using a CNT￾suspension with a solids content of 0.5 wt.%, on steel, copper, or graphite electrodes. Due to the negative ZP of CNTs in suspen￾sion, the deposits were always formed on the anode. Initially we performed an EPD experiment on a steel electrode. At voltages higher than 2.8 V, the electrolysis of water apparently limited the deposition, whereas at lower voltages, no deposit of carbon nan￾otubes was observed after 10 min. With a copper electrode, the bubble formation was suppressed due to the oxidation of cop￾per. A solid CNT-coating was also formed on a graphite anode at 2.8 V in 5 min. From the higher magnification image in Fig. 3, it is evident that the CNTs form a fairly uniform coating and that they are evenly distributed on the graphite electrode. In further EPD experiments, the SiC fibre mats were attached to the front side of the anode and were coated with a layer of CNTs at an applied voltage of 2.8 V for 10 min. In these exper￾iments, the SiC fabric was in contact with the anode so that it acted itself as the electrode. A similar result could be obtained by using the fibre mat directly as an electrode, as shown else￾where on the SiC/mullite system,43 however, due to the lower conductivity of the SiC fibres compared with a metal electrode, Fig. 6. Schematic representation of the EPD cell used for infiltration of SiC fibre fabric with SiC particles: (a) SiC-fabric is in contact with the electrode and (b) SiC-fabric is not in contact with the electrode