Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Effect of $NiAl_3$ on Mechanical Properties and Sintering of (W,Ti)C Hard Materials

$NiAl_3$ 첨가가 (W,Ti)C 초경재료 소결 및 기계적 성질에 미치는 영향

  • Park, Na-Ra (Division of Advanced Materials Engineering and the Research Center of Hydrogen and Fuel cell, Engineering College, Chonbuk National University) ;
  • Na, Kwon-Il (Division of Advanced Materials Engineering and the Research Center of Hydrogen and Fuel cell, Engineering College, Chonbuk National University) ;
  • Kwon, Hanjung (Minerals and Materials Processing Division, Korea Institute of Geoscience, Mining and Materials Resources) ;
  • Lim, Jae-Won (Minerals and Materials Processing Division, Korea Institute of Geoscience, Mining and Materials Resources) ;
  • Shon, In-Jin (Division of Advanced Materials Engineering and the Research Center of Hydrogen and Fuel cell, Engineering College, Chonbuk National University)
  • 박나라 (전북대학교 신소재공학부 수소연료전지센터) ;
  • 나권일 (전북대학교 신소재공학부 수소연료전지센터) ;
  • 권한중 (한국지질자원연구원) ;
  • 임재원 (한국지질자원연구원) ;
  • 손인진 (전북대학교 신소재공학부 수소연료전지센터)
  • Published : 2013.10.05
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Abstract

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-$NiAl_3$ 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-$NiAl_3$ 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-$NiAl_3$ produced by PCAS were also investigated.

Keywords

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