Articles
  • Tungsten Carbide-Silicon Carbide Nanocomposite Fibers Prepared from Tungsten Nanoparticle Dispersed Polycarbosilane by Electrospinning
  • Dong-Geun Shin1, Kwang-Youn Cho2, Eun-Ju Jin3, Younghee Kim1, Soo-Ryong Kim1, Woo-Teck Kwon1, Yoon-Joo Lee1, Jun-Sung Hong3 and Doh-Hyung Riu3,*
  • 1 Energy Efficient Materials Team, Korea Institute of Ceramic Engineering and Technology, 233-5 Gasan-dong, Guemcheon-gu, Seoul 153-801, Korea 2 Nano-Convergence Intelligence Materials Team, Korea Institute of Ceramic Engineering and Technology, 233-5 Gasan-dong, Guemcheon-gu, Seoul 153-801, Korea 3 Department of Materials Science and Engineering, Seoul National University of Technology, 172 Gongreung 2-dong, Nowon-gu, Seoul 139-743, Korea
Abstract
W2C–SiC nanocomposite fibers were fabricated by electrospinning and pyrolysis using tungsten nanoparticle (nW; diameter, 3-5 nm) dispersed polycarbosilane solution. The nW was uniformly dispersed in the electrospun polycarbosilane fibers and transformed into α-W2C during pyrolysis at 1200 oC, where the polycarbosilane-derived SiC fibers acted as a source of carbon and as an effective support for the α-W2C nanoparticles, preventing them from converting into another phase at 1200 oC. A part of the nW dispersed on the fiber surface is considered to transform into α-W2C at the early stages of pyrolysis by carburization with the gases evolved during the pyrolytic decomposition of poly carbosilane, such as CH4.

Keywords: Tungsten carbide (W2C), Catalyst, Tungsten nanopowder (nW), Electrospinning, Polycarbosilane, SiC fiber, Catalytic support materials (CSMs).

This Article

  • 2013; 14(4): 463-467

    Published on Aug 31, 2013