Structure and Properties of C/C-SiC Prepared by Reactive Melt Infiltration

C/C materials were prepared by liquid-vaporized and thermal-gradient CVI, and C/C-SiC composite with a density of 2.13～2.28 g/cm³ was prepared by reactive melt infiltration（RMI） in this paper. The microstructure of C/C-SiC was examined using XRD and OM, and its mechanical properties （flexural strength, compressive strength, hardness and fracture ductility）, friction and wear characteristics were investi-gated. The results show that C/C-SiC is composed of C, SiC and Si. The lower the density of C/C, the higher the density of corresponding C/C-SiC. By graphitization, the flexural strength of C/C-SiC decreased from 203～275 MPa to150～210 MPa and the compressive strength decreased from463～607 MPa to 403～536 MPa, but the fracture ductility increased from 6.6～8.5 MPa·m^1/2 to 7.3～9.2 MPa · m^1/2. During the sliding friction of C/C-SiC disc to SiC pin, the friction coeffici～ent was about 0.19. By graphitization, the friction coefficient decreased to 0.14～0.15, but the average volume loss rate increased from 3.4×10^-3～5.0×10^-3mm³/h to 7.9×10^-3～9.8×10^-3mm³/h.