Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Carbide Ceramics from Active-Filler-Controlled Pyrolysis in $CH_4$ Atmosphere

  • Kang, Keon-Taek (SungKyunKwan University, Department of Materials Engineering) ;
  • Kim, Deug-Joong (SungKyunKwan University, Department of Materials Engineering) ;
  • Annette Kaindl (University of Erlangen-Nuernberg, Department of Material Science) ;
  • Peter Greil (University of Erlangen-Nuernberg, Department of Material Science)
  • Published : 1999.12.01
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Abstract

The formation, microstructure and properties of novel ceramic composite materials manufactured by active-filler-controlled polymer pyrolysis were investigated. In the presence of active filler particles such as transition metals, bulk components of various geometry could be fabricated from siliconorganic polymer. Molybdenum- and tungsten-filled polymer suspensions were prepared and their conversion to ceramic composites by annealing in $CH_4$ atmosphere were studied. Dimensional change. porosity and phase distribution (filler network) were analyzed and correlated to the resulting hardness values. Molybdenum and tungsten as active filler were carburized completely to $Mo_2C$, $W_2C$ and WC in $CH_4$ atmosphere. Consequently, microcrystalline composites with the filler reaction products embedded in a silicon oxycarbide glass matrix were formed. Hardness was increased with increasing carburization and reached 8.6-9.5 GPa in the specimen pyrolyzed in $CH_4$ atmosphere.

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