Enhanced Flexibility and Microwave Absorption Properties of HfC/SiC Nanofiber Mats

Yi Hou, Laifei Cheng, Yani Zhang, Yong Yang, Chaoran Deng, Zhihong Yang, Qi Chen, Xiaoqing Du, Chen Zhao, Lianxi Zheng

Research output: Contribution to journalArticlepeer-review

108 Scopus citations

Abstract

Hafnium carbide (HfC) phase, with a high melting point, excellent strength, and high electrical conductivity, could be a suitable addition to enhance the microwave absorption properties of one-dimensional silicon carbide (SiC) nanomaterials without sacrificing its high-temperature thermal stability. In the present work, HfC/SiC hybrid nanofiber mats with different HfC loading contents are fabricated by electrospinning and high-temperature pyrolysis. HfC hybrids with sizes of 5-10 nm are embedded in the SiC nanofibers. As the HfC content increases from 0 to 6.3 wt %, the average diameter of the fibers drops from 2.62 μm to 260 nm. Meanwhile, the electrical conductivity rises from 7.9 × 10-8 to 4.2 × 10-5 S/cm. Moreover, the flexibility of the nanofiber mats is also greatly improved, according to a 200-times 180° bending test. Furthermore, compared with pure SiC fiber mats, the HfC/SiC nanofiber mats possess much larger dielectric loss because of higher electrical conductivity. At the optimal HfC content of 2.5 wt %, the HfC/SiC nanofibers/silicon resin composite (10 wt %) exhibits a minimal reflection loss (RL) of -33.9 dB at 12.8 GHz and a 3 mm thickness with a broad effective absorption bandwidth (RL < -10 dB) of 7.4 GHz. The above results prove that introducing HfC into SiC nanofiber mats is an effective way to enhance their flexibility, dielectric properties, and microwave absorption performance.

Original languageBritish English
Pages (from-to)29876-29883
Number of pages8
JournalACS Applied Materials and Interfaces
Volume10
Issue number35
DOIs
StatePublished - 5 Sep 2018

Keywords

  • dielectric loss
  • electrospinning
  • flexibility
  • HfC/SiC hybrid nanofiber
  • microwave absorption

Fingerprint

Dive into the research topics of 'Enhanced Flexibility and Microwave Absorption Properties of HfC/SiC Nanofiber Mats'. Together they form a unique fingerprint.

Cite this