Improvement of porous silicon carbide filters by growth of silicon carbide nanowires using a modified carbothermal reduction process

摘要

Porous ceramics which contain nanowires are promising candidates for catalyst support applications. Here we report a cost-efficient carbothermal reduction process to produce a porous SiC filter with SiC nanowires in the honeycomb structure. For this, the mixture of SiO_2 and carbon black was applied as a source of SiO gas. In addition, the SiC filter was coated with diluted phenolic resin to induce additional carbothermal reduction in the filter. beta-SiC nanowires were successfully obtained at and above 1400 deg C. Surface area of the porous SiC filter increased from 18.72 to 54.51 m~2/g by the in situ formation of the nanowires.