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Synthesis of TiN/TiB2/Ti-silicides Nanocomposite Powders by Mechanochemical Reaction and its Reaction Mechanism

기계화학반응에 의한 TiN/TiB2/Ti-silicides 나노복합분말의 합성과 반응기구

  • Cho Young-Whan (Nano-Materials Research Center, Korea Institute of Science and Technology) ;
  • Kim Ji-Woo (Nano-Materials Research Center, Korea Institute of Science and Technology) ;
  • Shim Jae-Hyeok (Nano-Materials Research Center, Korea Institute of Science and Technology) ;
  • Ahn Jae-Pyoung (Nano-Materials Research Center, Korea Institute of Science and Technology) ;
  • Oh Kyu-Hwan (School of Materials Science and Engineering, Seoul National University)
  • 조영환 (나노재료연구센터, 한국과학기술연구원) ;
  • 김지우 (나노재료연구센터, 한국과학기술연구원) ;
  • 심재혁 (나노재료연구센터, 한국과학기술연구원) ;
  • 안재평 (나노재료연구센터, 한국과학기술연구원) ;
  • 오규환 (재료공학부, 서울대학교)
  • Published : 2005.08.01

Abstract

Nanostructured TiN/$TiB_2$/$TiSi_2$ and TiN/$TiB_2$/$Ti_5Si_2$ composite powders have been prepared by mechanochemical reaction from mixtures of Ti, BN, and $Si_3N_4$ powders. The raw materials have reacted to form a uniform mixture of TiN, $TiB_2$ and $TiSi_2$ or $Ti_5Si_3$ depending on the amount of $Si_3N_4$ used in the starting mixtures, and the reaction proceeded through so-called mechanically activated self-sustaining reaction (MSR). Fine TiN and $TiB_2$ crystallites less than a few tens of nanometer were homogeneously dispersed in the amorphous $TiSi_2$ or $Ti_5Si_3$ matrix after milling for 12 hours. These amorphous matrices became crystalline phases after annealing at high temperatures as expected, but the original microstructure did not change significantly.

Keywords

References

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