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고주파유도 가열에 의한 나노구조의 TiAl 급속소결과 합성 및 기계적 성질
김나리 ( Na Ri Kim ),나권일 ( Kwon Il Na ),김원백 ( Won Baek Kim ),조성욱 ( Sung Wook Cho ),손인진 ( In JIn Shon ) 대한금속재료학회 ( 구 대한금속학회 ) 2010 대한금속·재료학회지 Vol.48 No.11
A nanopowder of TiAl was synthesized by high energy ball milling. Dense nanostuctured TiAl was consolidated using a high frequency induction heated sintering method within 2 minutes from mechanically synthesized powders of TiAl and horizontally milled powders of Ti+Al. Properties of the TiAl obtained using the two methods were compared. The grain size and hardness of TiAl sintered from horizontally milled Ti+Al powders and high energy ball milled TiAl powder were 40 nm, 20 nm, and 630 kg/mm2, 700 kg/mm2, respectively.
NiAl3 첨가가 (W,Ti)C 초경재료 소결 및 기계적 성질에 미치는 영향
박나라 ( Na Ra Park ),나권일 ( Kwon Il Na ),권한중 ( Han Jung Kwon ),임재원 ( Jae Won Lim ),손인진 ( In Jin Shon ) 대한금속재료학회(구 대한금속학회) 2013 대한금속·재료학회지 Vol.51 No.10
Co or Ni was added to cemented (W,Ti)C as a binder for forming composite structures. The high cost of Co or Ni and the low corrosion resistance of (W,Ti)C-Co or (W,Ti)C-Ni cermet have generated interest in recent years in the search to find alternative binder phases. It has been reported that aluminides have a higher oxidation resistance, a higher hardness and are cheaper materials than Co and Ni. Using a pulsed current activated sintering (PCAS) method, the densification of (W,Ti)C and (W,Ti)C-NiAl3 hard materials were accomplished within 3 minutes. The advantage of this process is not only rapid densification to near theoretical density but also the prohibition of grain growth in nano-structured materials. Highly dense (W,Ti)C and (W,Ti)C-NiAl3 with a relative density of up to 99% were obtained within 3 minutes by PCAS under a pressure of 80 MPa. The average grain sizes of the (W,Ti)C was lower than 100 nm. The hardness and fracture toughness of the dense (W,Ti)C and (W,Ti)C-NiAl3 produced by PCAS were also investigated. (Received March 22, 2013)