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Vol.50, No.12, 921 ~ 930, 2012
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| Title |
| Fabrication and Mechanical Properties of WC-Mo2C-Co Hard Materials by the Pulsed Current Activated Sintering Method |
| 윤희준 Hee Jun Youn , 방한서 Han Sur Bang , 방희선 Hee Seon Bang , 오익현 Ik Hyun Oh , 박현국 Hyun Kuk Park |
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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%Mo2C-5wt% Co hard material using WC, Mo2C, and Co. The WC-Mo2C-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 ㎛. The vickers hardness and fracture toughness of the WC-5wt%Mo2C-5wt%Co hard materials were about 2453.5 kg/mm2 and 7.9 MPa · m1/2, respectively, for 60 MPa at 11200℃. |
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| Key Words |
| pulsed current activated sintering method, WC-Mo2C-Co, hard material, mechanical property, rapid sintering |
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