Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Fabrication and Mechanical Properties of WC-Mo2C-Co Hard Materials by the Pulsed Current Activated Sintering Method

펄스 전류 활성 소결법을 이용한 WC-Mo2C-Co 소결체 제조 및 기계적 특성 평가

  • Youn, Hee-Jun (Korea Institute of Industrial Technology (KITECH), Automotive Components Group) ;
  • Bang, Han-Sur (Department of Naval Architecture and Ocean Engineering, Chosun University) ;
  • Bang, Hee-Seon (Department of Naval Architecture and Ocean Engineering, Chosun University) ;
  • Oh, Ik-Hyun (Korea Institute of Industrial Technology (KITECH), Automotive Components Group) ;
  • Park, Hyun-Kuk (Korea Institute of Industrial Technology (KITECH), Automotive Components Group)
  • 윤희준 (한국생산기술연구원 동력부품연구그룹) ;
  • 방한서 (조선대학교 선박해양공학과) ;
  • 방희선 (조선대학교 선박해양공학과) ;
  • 오익현 (한국생산기술연구원 동력부품연구그룹) ;
  • 박현국 (한국생산기술연구원 동력부품연구그룹)
  • Received : 2011.10.17
  • Published : 2012.12.25
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Abstract

The pulsed current activated sintering method (PCAS) is a new rapid sintering method that was developed recently for fabricating ceramics and composites. This method combines a high temperature for a short time with pressure application. In this work, PCAS was used to fabricate $WC-5wt%Mo_2C-5wt%$ Co hard material using WC, $Mo_2C$, and Co. The $WC-Mo_2C-Co$ was almost completely dense with a relative density of up to 100% after the simultaneous application of a pressure of 60 MPa and electric current for 11 min without grain growth. The average grain size of WC that was produced through PCAS was about $0.5-0.6{\mu}m$. The vickers hardness and fracture toughness of the $WC-5wt%Mo_2C-5wt%$Co hard materials were about $2453.5kg/mm^2$ and $7.9MPa{\cdot}m^{1/2}$, respectively, for 60 MPa at $11200^{\circ}C$.

Keywords

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