Effects of skeleton pore size on the microstructure and electromagnetic absorbing property of the SiC nanowires/SiC composites

摘要

SiC nanowires exhibited great electromagnetic absorbing property while decorated in porous ceramic skeletons. However, the ceramic skeletons used in former researches always had multi-mode pore structure, so the effects of skeleton pore size on the properties of SiC nanowires could not be researched independently. In this work, porous SiC ceramics with single-mode pore distribution and controllable pore size were applied to prepare SiC nanowires/SiC composites. While the skeleton pore size was decreased from 13.94 mu m to 2.18 mu m, the SiC nanowires turned from straight to curved. Compared with the straight nanowires, the curved ones presented high-density stacking faults and large surface area, endowing the composites with superior electromagnetic absorbing property. (C) 2021 Elsevier B.V. All rights reserved.