Interface modification of SiC-fibre/copper matrix composites by applying a titanium interlayer

Metal matrix composites using a copper matrix for high thermal conductivity reinforced with silicon carbide long fibres for strength are being considered as heat sinks for future fusion reactors. C fibres were coated with the copper matrix by electroplating at room temperature within 8 h and the composite material was obtained by hot-isostatic pressing at 650 °C and 100 MPa. -fibre push-out tests indicate a very poor adhesion between the SiC fibres and the galvanic copper matrix. To improve the bonding a thin titanium interlayer was deposited on the fibres by magnetron sputtering and heat-treated at 550 °C in vacuum to form TiC with the carbon surface of the SiC fibres. The bonding strength of these composites increased at least tenfold in relation to the material without titanium interlayer.