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.
Highlights
Silicon carbide (SiC) was widely applied in high-temperature industries as refractory lining for blast furnace and as a smelting refractory owing to its excellent slag resistance, corrosion resistance, high hardness, better thermal stability, and so forth [1,2,3,4]
It was scarcely reported that rare-earth oxide La2O3-Al2O3 was utilized to fabricate in situ SiC nanowires in the Cw/SiC composites [12]
We found that annealed time could control volatilization degree of sintering additives, it could change distribution of pore channels in the SiC matrix, and it could affect flexural strength and fracture toughness of AM90
Summary
Silicon carbide (SiC) was widely applied in high-temperature industries as refractory lining for blast furnace and as a smelting refractory owing to its excellent slag resistance, corrosion resistance, high hardness, better thermal stability, and so forth [1,2,3,4]. As an effective reinforced material, one-dimensional nanowire was widely applied due to its excellent mechanical properties. Some reports were brought forward for synthesis of SiC nanowires (SiCnw) [5,6,7,8,9,10], including arc discharge, laser ablation, and carbon thermal reduction. It was scarcely reported that rare-earth oxide La2O3-Al2O3 was utilized to fabricate in situ SiC nanowires in the Cw/SiC composites [12]. An attempt was made to analyse the growth behavior of SiC nanowire in the SiC substrate under different annealed time. The main purpose was to investigate influence of different annealed time on the microstructure and mechanical properties of Cw/SiC composites compared with the hot press sinter Cw/SiC composites. The toughening mechanisms of Cw/SiC composites were analyzed in detail
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