A new design for preparation of high performance recrystallized silicon carbide

Applications urgently demand higher flexural strength and oxidation resistance of recrystallized silicon carbide (RSiC), which is weakened by its relatively low density and porous structure. In this paper, a new approach of a cyclic process of polymer impregnation and pyrolysis (PIP), and recrystallization, has been used to decrease porosity and increase the density of commercial RSiC. As a result, a high performance RSiC with a density of 2.99 g/cm3 and flexural strength of 162.3 MPa was obtained via three PIP-recrystallization cycles, in addition to an improved oxidation resistance. The pre-treatment of PCS has also been discussed to improve the purity of its pyrolysis product.