Influence of Hot Pressing Process on the Properties of Cf/SiO2 Composites

C_f/SiO₂ composites were prepared by slurry impregnation-hot pressing process, and their mechanical properties, microstructure and surface morphologies were then investigated. The results indicated that the composites showed the best mechanical properties, and the tensile strength, bending curvature, compression strength were 58MPa, 170MPa, 256MPa respectively. XRD spectrums showed that fused quartz appeared no crystallization during the process. Also from the TEM analysis, we can see that the C_f/SiO₂ composites exhibited the best compactness. All the tests were carried out on the composites autoclaved at 1400°C for 60min, according to which the best hot pressing process was concluded.