Synthesis and properties of an SiC/Si_<em>xO_<em>yC_<em>z discontinuous reinforced ceramic composite

Using the amorphous Si_<em>xO_<em>yC_<em>z ceramic pyrolyzed from polysiloxane silicon resin YR3370 (GE toshiba silicones) as the matrix, and 0.8μm SiC particle as the discontinuous reinforcement, an SiC/Si_<em>xO_<em>yC_<em>z discontinuous reinforced ceramic composite was prepared. When the biscuit contains 50% of SiC particle and is pyrolyzed in a 99.99% nitrogen flux at 1100~1300℃ for 1h, the ceramic matrix composite has a density of 2.27g/cm³ and a Vickers hardness of 741kg/mm². The mechanics properties of the composite were discussed through structure modeling and strength calculation. The characteristic of the composite structure is that the discontinuous reinforcement SiC particles are wrapped in the continuous amorphous Si_<em>xO_<em>yC_<em>z ceramic matrix, and there is reasonable thermal expansion compatibility between them, which can improve the brittleness of monolithic ceramic materials.