- The Characteristic Changes of Sintered WC-10Co Fabricated by PIM Method with Different Carbon Content
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Sang-Dae Kang, Dong-Wook Park, Young-Sam Kwon, Kwon-Koo Cho, In-Shup Ahn
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J Korean Powder Metall Inst. 2011;18(3):262-268.
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DOI: https://doi.org/10.4150/KPMI.2011.18.3.262
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 Abstract
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- In order to investigate the microstructure and mechanical properties of WC-10 wt% Co insert tool alloy fabricated by PIM (Powder Injection Molding) process, the feedstock of WC-10 wt% and wax used as a kind of binder were mixed together by two blade mixer. After injection molding, the debinding process was carried out by two-steps. First, solvent extraction, in which the binder was eliminated by putting the specimen into normal hexane for 24 hrs at 60°C, and subsequently thermal debinding which was conducted at 260°C and 480°C for 6 hrs in the mixed gas of H_2/N_2, respectively. Meantime, in order to compensate the decarburization due to hydrogen, 1.2~1.8% of carbon was added to ensure the integrity of the phase. Finally, the specimens were sintered in vacuum under different temperatures, and the relative density of 99.8% and hardness of 2100 Hv can be achieved when sintered at 1380°C, even the TRS is lower than the conventional sintering process.
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