Effects of mechanical milling on the carbothermal reduction of oxide of WC/Co hardmetal scrap
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The effects of mechanical milling on the carbothermal reduction of oxidized WC/Co hardmetal scrap with solid carbon were examined. Mixed powders were manufactured by milling the WC/Co hard metal scrap oxide and carbon powder in either a tumbler-ball mill or a planetary-ball mill. The milling type affected the carbothermal reduction of the oxide owing to the differing collision energies (mechanical milling energies) in the mills. The hardmetal scrap oxide powder (WO3, CoWO4) milled at high energy was more greatly reduced and at a lower temperature than that milled at lower mechanical energy. The formation of WC by the carburization reaction with solid carbon reached completion at a lower temperature after higher-energy milling than after lower-energy milling. The WC/Co composite particles synthesized by the combined oxidationmechanical milling-carbothermal reduction process were smaller when the initial powder was milled at higher mechanical energy.
Keywordsmechanical milling powder processing phase transformation hardmetal tungsten carbide
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- 1.K. J. A. Brookes, World Directory and Handbook of Hardmetals and Hard Materials, Sixth ed., pp.9–20, International Carbide Data, Hertfordshire (1996).Google Scholar
- 3.E. Lassner and W. D. Schubert, Tungsten Properties, Chemistry, Technology of the Element, Alloys and Chemical Compounds, pp.377–385, Bloating-Crushing Process Kluwer Academic Plenum Publishers, New York (1999).Google Scholar
- 5.E. Altuncu, F. Ustel, A. Turk, S. Ozturk, and G. Erdogan, Mater. & Technol. 47, 115 (2013).Google Scholar
- 7.T. Ishida, T. Itakura, H. Moriguchi, and A. Ikegaya, SEI Technical Review 75, 38 (2012).Google Scholar
- 10.J. C. Lin, J. Y. Lin and S. L. Lee, U. S. Patent, No.5384016 (1995).Google Scholar
- 16.K. J. A. Brookes, World Directory and Handbook of Hardmetals and Hard Materials, Sixth ed., pp.95–102, International Carbide Data, Hertfordshire (1996).Google Scholar
- 17.H. J. Fecht, E. Hellstern, Z. Fu, and W. L. Johnson, Metall. Trans. A 21A, 1990 (1990).Google Scholar
- 24.G. G. Lee, G. H. Ha, and B. K. Kim, J. Kor. Inst. Metal. & Mater. 37, 1233 (1999).Google Scholar
- 28.B. D. Cullity, Elements of X-ray Diffraction, Second ed., pp.81–145, Addison-Wesley Publishing Company Inc., London (1978).Google Scholar
- 31.ASM International Committee, ASM Handbook Vol. 7 Powder Metal Technologies and Application, pp.53–66, ASM International, New York (1998).Google Scholar
- 35.R. Abbaschian, L. Abbaschian, and R. E. Reed-Hill, Physical Metallurgy Principles, Fourth ed., pp.348–407, Cengage Learning, New York (2010).Google Scholar