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Korean Journal of Metals and Materials > Volume 55(11); 2017 > Article
Korean Journal of Metals and Materials 2017;55(11): 783-789. doi: https://doi.org/10.3365/KJMM.2017.55.11.783
펄스통전활성 소결법 적용 WC 합금 소결체 제조 및 기계적 특성 평가
이정한1,2, 박현국1, 장준호1,3, 홍성길2, 오익현1
1한국생산기술연구원 동력부품소재그룹
2전남대학교 신소재공학과
3전북대학교 금속공학과
Fabrication and Mechanical Properties of WC Alloy Hard Materials by a Pulsed Current Activated Sintering Method
Jeong-Han Lee1,2, Hyun-Kuk Park1, Jun-Ho Jang1,3, Sung-Kil Hong2, Ik-Hyun Oh1
1Korea Institute of Industrial Technology(KITECH), Automotive & Components Materials, Gwangju 61012, Republic of Korea
2Division of Advanced Materials Engineering, Chonnam National University, Gwangju 61186, Republic of Korea
3Division of Advanced Materials Engineering, Chonbuk National University, Jeonju 54896, Republic of Korea
Correspondence  Ik-Hyun Oh ,Tel: +82-62-600-6180, Email: ihoh@kitech.re.kr
Received: 9 June 2017;  Accepted: 12 July 2017.  Published online: 31 October 2017.
ABSTRACT
In this study, planetary ball milled WC-5 wt%Co powders were sintered using the pulsed current activated sintering (PCAS) process. With this process, fully densified hard materials were obtained in a shorter time than conventional processes such as a HP and HIP. The particle sizes of the planetary ball milled WC and Co were 0.114 μm and 0.154 μm, respectively. The PCAS process was performed at temperatures up to 1300 ℃ with 60 MPa and electric current for 13 min without any significant change in the grain size. The WC-5 wt% Co hard materials were fully densified with a relative density of up to 99.8%. The density of WC-5 wt% Co hard materials increased with increasing shrinkage ratio. In addition, the Co particles penetrated into the WC particles by dissolving and re-precipitation, and finally hard materials were completely densified. The average grain size of the WC-5 wt%Co was 0.25 μm, and the hardness and fracture toughness were 2,386 kg/mm2 and 6.0 MPa・m1/2, respectively. The mechanical properties of the WC-5 wt% Co hard materials were excellent because of grain refinement and densification.
Keywords: pulsed current activated sintering process, rapid sintering, WC-.Co, planetary ball milling, mechanical property
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