Fabrication of SiC Composites with Synergistic Toughening of Carbon Whisker andIn Situ3C-SiC Nanowire

Abstract

The SiC composites with synergistic toughening of carbon whisker andin situ3C-SiC nanowire have been fabricated by hot press sinter technology and annealed treatment technology. Effect of annealed time on the morphology of SiC nanowires and mechanical properties of theCw/SiC composites was surveyed in detail. The appropriate annealed time improved mechanical properties of theCw/SiC composites. The synergistic effect of carbon whisker and SiC nanowire can improve the fracture toughness forCw/SiC composites. The vapor-liquid-solid growth (VLS) mechanism was proposed. TEM photo showed that 3C-SiC nanowire can be obtained with preferential growth plane ({111}), which corresponded to interplanar spacing about 0.25 nm.

Synthesis of High-Purity SiC Nanowires via Catalyst-Free Pyrolysis of SiO2/Si and Sponge-Like Graphene Oxide

“…These faults matched the weak shoulder peak marked with SF, which emerged at the left side of the peak for the (111) diffraction plane. Moreover, such stacking faults were also found by other researchers. , No other peaks were detected, indicating that no obvious impurity was formed. The strong intensities and sharp peaks of SiC compared with the background indicates good structural integrity .…”

“…Moreover, such stacking faults were also found by other researchers. 4 , 11 No other peaks were detected, indicating that no obvious impurity was formed. The strong intensities and sharp peaks of SiC compared with the background indicates good structural integrity.…”

“…Moreover, such stacking faults were also found by other researchers. 4,11 No other peaks were detected, indicating that no obvious impurity was formed.…”

“…In addition, compared to SiC bulk and powder materials, SiCNWs exhibit greater thermal conductivity, mechanical strength, chemical stability, and mechanical properties. − Currently, SiCNWs are widely used in optoelectronics and power electronic devices because of their unique electrochemical properties. In addition, SiCNWs are also used to toughen ceramic matrix composites due to their superplasticity at low temperatures and relatively high strength. − Therefore, it is of great interest to obtain high-purity SiC nanowires through a simple and low-cost synthesis route.…”