Preparation, characterization and microwave absorption properties of bamboo-like β-SiC nanowhiskers by molten-salt synthesis

摘要

Bamboo-like and cubic single-crystalline silicon carbide nanowhiskers (SIC_(NWs)) were synthesized using multiwalled carbon nanotube via a process of calcination in the molten-salt circumstance. The system was heated to 1,250 ℃ and maintained for 6 h in argon atmosphere, and obtained the sample. The as-prepared sample was characterized by a series of techniques. Especially, the microwave absorption properties of SiC_(NWs)/paraffin composites (30 wt%) were investigated over 2-14 GHz. The result shows the optimal reflection loss can reach -48.1 dB at 13.52 GHz when the thickness of the match is only 1.9 mm. The excellent microwave absorption properties of the SiC_(NWs)/paraffin composites due to the dielectric loss would make it as a promising candidate for the application of absorbing materials. In addition, a possible growth mechanism of SiC_(NWs) was also discussed.