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

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Thermal Stability and Properties of Cu-$TiB_2$ Nanocomposites Prepared by Combustion Synthesis and Spark-plasma Sintering

  • Kwon, Dae-Hwan (Research Center for Machine Parts and Materials, School of Materials Science & Engineering Processing, University of Ulsan) ;
  • Nguyen, Thuy Dang (Research Center for Machine Parts and Materials, School of Materials Science & Engineering Processing, University of Ulsan) ;
  • Dudina, Dina (Research Center for Machine Parts and Materials, School of Materials Science & Engineering Processing, University of Ulsan) ;
  • Kum, Jong-Won (Research Center for Machine Parts and Materials, School of Materials Science & Engineering Processing, University of Ulsan) ;
  • Choi, Pyuck-Pa (Research Center for Machine Parts and Materials, School of Materials Science & Engineering Processing, University of Ulsan) ;
  • Kim, Ji-Soon (Research Center for Machine Parts and Materials, School of Materials Science & Engineering Processing, University of Ulsan) ;
  • Kwon, Young-Soon (Research Center for Machine Parts and Materials, School of Materials Science & Engineering Processing, University of Ulsan)
  • Published : 2006.09.24
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Abstract

Cu-$TiB_2$ nanocomposite powders were synthesized by combining high-energy ball-milling of Cu-Ti-B mixtures and subsequent self-propagating high temperature synthesis (SHS). Cu-40wt.%$TiB_2$ powders were produced by SHS reaction and ball-milled. The milled SHS powder was mixed with Cu powders by ball milling to produce Cu-2.5wt.%$TiB_2$ composites. $TiB_2$ particles less than 250nm were formed in the copper matrix after SHS-reaction. The releative density, electrical conductivity and hardness of specimens sintered at $650-750^{\circ}C$ were nearly 98%, 83%IACS and 71HRB, respectively. After heat treatment at 850 to $950^{\circ}C$ for 2 hours under Ar atmosphere, hardness was descedned by 15%. Our Cu-$TiB_2$ composite showed good thermal stability at eleveated temperature.

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