Proceedings of the Korean Powder Metallurgy Institute Conference (한국분말야금학회:학술대회논문집)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Vacuum Carbonization of Nanometer Tungsten Powder with Carbon Black

  • Luo, Ji (School of Materials Science and Engineering, University of Science and Technology Beijing) ;
  • Lin, Tao (School of Materials Science and Engineering, University of Science and Technology Beijing) ;
  • Guo, Zhi-meng (School of Materials Science and Engineering, University of Science and Technology Beijing) ;
  • Jia, Chengchang (School of Materials Science and Engineering, University of Science and Technology Beijing)
  • Published : 2006.09.24
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Abstract

Vacuum carbonization of nanometer tungsten powder was investigated in a simple designed apparatus. An X-Y recorder was used to plot differential thermal analysis (DTA) curves to determine starting temperature of carbonization of four samples with different specific surface area. The product was detected by X-ray Diffraction (XRD) and small angle X-ray scattering (SAXS). The results show that finer tungsten powder has lower starting temperature of carbonization. Tungsten powder, which BET surface area is $32.97m^2/g$, is completely carbonized to tungsten carbide at $1050^{\circ}C$, although the starting temperature is $865^{\circ}C$. Particle grows sharply before carbonization.

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