In situ synthesis of homogeneously dispersed SiC nanowires in reaction sintered silicon-based ceramic powders

摘要

The synthesis of homogeneously dispersed SiC nanowires in the ceramic powders arouses considerable interests due to its potential applications as reinforcements in the ceramic matrix composites. Herein, we reported a facile and novel approach to in situ synthesize homogeneously dispersed SiC nanowires in the reaction sintered silicon based ceramic powders. The as-synthesized nanowires exhibited the single-crystalline 3C-SiC with diameters of 50-200 nm and lengths ranging from tens to over 100 mu m. Combining further experimental results and thermodynamics analysis, we demonstrated the importance of the free silicon for the in situ synthesis of SiC nano wires in the reaction sintered silicon-based ceramic powders, since it increased the equilibrium vapor pressure of SiO gaseous product in the system.